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产品（23)
AD780ARZ-REEL7 - 2.5V/3.0V High Precision Reference | Analog Devices
The AD780ARZ-REEL7 from Analog Devices is an ultrahigh precision band gap voltage reference that provides a programmable output of either 2.5V or 3.0V with exceptional accuracy and stability. Housed in an 8-pin SOIC package, this device is designed for high-performance applications requiring a stable and precise voltage reference. The AD780 offers a temperature coefficient as low as 3 ppm/°C (grade A) and initial accuracy of ±0.2% (grade A), ensuring reliable performance across a wide temperature range. With a low output noise of 4 µV p-p (0.1 Hz to 10 Hz) and a wideband spectral noise density of 100 nV/√Hz, the AD780 is ideal for noise-sensitive applications such as precision data converters, instrumentation, and industrial control systems. A voltage reference is a crucial component in analog and mixed-signal systems, providing a stable and accurate voltage that serves as a benchmark for analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and comparators. The AD780 belongs to the category of series voltage references, which regulate output voltage by controlling the current through a pass element, offering low output impedance and excellent load regulation. This makes it suitable for driving dynamic loads without significant voltage droop. Key features of the AD780 include a programmable output voltage (2.5V or 3.0V), a wide supply voltage range (up to 36V), and a maximum output current of 10 mA. The device also includes a temperature output pin that can be used as a temperature transducer, providing a voltage proportional to temperature. The AD780 is a pin-compatible performance upgrade for the LT1019(A)-2.5 and the AD680, offering improved specifications and reliability. Technically, the AD780 utilizes a band gap architecture with laser-trimmed thin-film resistors to achieve high accuracy and low drift. The device operates over a temperature range of -40°C to +85°C (grade A) and is available in multiple grades (A, B, C) with varying accuracy and temperature coefficient specifications. The AD780 also features low quiescent current, making it suitable for battery-powered applications. Typical applications include precision data acquisition systems, high-resolution ADCs and DACs, industrial process control, and portable instrumentation. The AD780's low noise and high stability make it an excellent choice for reference designs in medical devices, automotive electronics, and communication systems. When designing with the AD780, it is important to place a 0.1 µF bypass capacitor close to the VIN pin and a 1 µF capacitor on the output to ensure stability. Additionally, the temperature output pin can be used for temperature sensing, but care must be taken to avoid loading it excessively.
ADR421BRZ - 2.5V Ultraprecision Low Noise Voltage Reference | Analog Devices
The Analog Devices ADR421BRZ is an ultraprecision, low-noise, 2.500 V XFET voltage reference IC delivering ±0.04% initial accuracy, 1.75 µV p-p noise (0.1 Hz to 10 Hz), and 3 ppm/°C maximum temperature coefficient in an 8-pin SOIC package (R-8). It provides up to 10 mA of source current from a 4.5 V to 18 V input supply, with 70 ppm/mA load regulation and 35 ppm/V line regulation. An XFET voltage reference is a specialized series-mode reference that uses an externally modulated JFET pair to generate a temperature-compensated bandgap-like voltage, achieving lower noise and better long-term stability than conventional buried-Zener references. It occupies the product hierarchy of voltage reference -> series reference -> precision reference -> power management IC, serving as the stable potential against which ADCs, DACs, and precision analog signal chains are calibrated. Key features include sub-2 µV p-p low-frequency noise, 50 ppm/1000 hrs long-term stability, 40 ppm typical hysteresis, and a wide 4.5 V to 18 V supply operating range with low quiescent current. The XFET architecture also eliminates the need for a resistor in series with the supply pin required by older Zener designs, simplifying PCB layout and improving turn-on settling. Architecturally, the XFET cell pairs a JFET reference transistor with a second JFET biased to cancel temperature drift. A precision op-amp servos the bandgap-like cell to maintain constant VOUT, while the trim network programs the initial accuracy. This topology trades the higher pre-trim noise of bandgap references for far better long-term drift and thermal hysteresis. Typical applications include precision 16-bit and 24-bit ADC and DAC reference inputs, industrial process control calibration, automatic test equipment (ATE) system references, and precision data acquisition systems in medical imaging, weighing scales, and 6.5-digit digital multimeters. The 2.5 V output makes it an ideal companion to devices such as the AD8628, AD8629, and ADI's AD57xx, AD76xx, and ADuM-series converter families. When designing with the ADR421BRZ, route the output node directly to the reference pin of the target converter with a 0.1 µF ceramic plus 1 µF tantalum bypass network within 5 mm of the reference pin to preserve noise and load regulation. Avoid running digital or switching traces under the reference - injected charge can deteriorate 0.1 Hz to 10 Hz noise performance. This page synthesizes distributor pricing across nine channels, parametric drop-in alternatives, and practical layout notes not consolidated on the manufacturer datasheet.
ADR421BRZ-REEL7 - 2.5V Ultraprecision XFET Voltage Reference | Analog Devices
The Analog Devices ADR421BRZ-REEL7 is an ultraprecision, low-noise 2.500 V XFET voltage reference IC delivering up to 10 mA output current in an 8-pin SOIC package, supplied on a 7-inch reel for high-volume SMT assembly. It features an initial accuracy of ±0.04% (B-grade), 3 ppm/°C temperature coefficient, 1.75 µV p-p noise (0.1 Hz to 10 Hz), and 50 ppm/1000-hour long-term stability, with an operating input range of 4.5 V to 18 V. A voltage reference is a precision circuit that produces a stable, known DC voltage independent of supply variations, temperature, and load current. Voltage references sit at the base of the signal chain in data acquisition, instrumentation, and precision analog systems: their absolute accuracy and noise floor set the ultimate performance limit of downstream ADCs, DACs, sensor bridges, and weighing scales. The ADR421 belongs to the XFET (eXtra implanted junction FET) family, which uses a junction FET reference cell rather than a buried Zener or bandgap to achieve sub-2 µV p-p noise and excellent thermal hysteresis of 40 ppm typical. Key features include 4.5 V to 18 V supply range, low supply current of 0.5 mA typical, line regulation of 35 ppm/V, load regulation of 70 ppm/mA, and -40 °C to +125 °C operating temperature. The SOIC-8 (R-8) package is the industry-standard precision reference footprint, allowing direct substitution on most reference layouts. Unlike buried-Zener references that need 10 V minimum, the XFET architecture operates from as low as 4.5 V, suiting it to 5 V and ±5 V or +5 V/-12 V system rails. The ADR421 is offered in three grades (A: ±0.05%, B: ±0.04%, C: ±0.12%) and three packages (8-lead SOIC, 8-lead MSOP, TO-92). Typical applications include precision data acquisition system references, high-resolution ADC and DAC reference inputs, industrial process control calibration, precision weighing scales, medical instrumentation, and instrumentation amplifiers. The 2.500 V output matches the full-scale range of many 16-bit and 24-bit sigma-delta ADCs (e.g., AD7799/AD7730 families) and is compatible with 5 V reference-input DACs. When designing with the ADR421, add a 0.1 µF ceramic bypass capacitor close to the supply pin and a 1 µF to 10 µF tantalum or ceramic capacitor on the output for stable load-transient response. The trim pin (pin 5) allows ±0.5% fine adjustment of the output using a 10 kΩ/1 kΩ divider; leave it open if trimming is not required. This page synthesizes distributor pricing, drop-in same-brand and cross-brand alternatives, and practical design notes not found in the manufacturer datasheet alone.
ATL432LIBIDBZR - 2.5V Adjustable Shunt Reference, ±0.5%, SOT-23-3 | Texas Instruments
The Texas Instruments ATL432LIBIDBZR is a 2.5 V precision adjustable shunt voltage reference in a 3-pin SOT-23 (DBZ) package, offering an initial accuracy of ±0.5% (B grade), an adjustable cathode voltage up to 36 V, and up to 100 mA of cathode current capability. As a thin microcontroller in the TL43x family, it is engineered to deliver tight tolerance and low-Iq performance in compact portable designs. A shunt voltage reference is a two-terminal device that maintains a constant voltage between its cathode and anode by sinking or sourcing current, behaving like a precision Zener diode with a programmable breakdown voltage. It belongs to the broader category of voltage references -> linear regulators -> power management ICs -> analog semiconductors, and is widely used to set the threshold for op-amps, comparators, ADC/DAC references, and adjustable linear regulators. Key features include a low minimum cathode current of approximately 100 A (typical), a wide programmable output range of 2.5 V to 36 V set by an external resistor divider, and a typical output impedance around 0.05 ohm at low frequencies. The reference exhibits excellent stability across load and temperature variations, with a typical temperature drift in the tens of ppm/C range, making it well suited to systems that previously relied on a TL431/TL432 but require tighter initial accuracy and lower quiescent current. The ATL432 uses a bandgap reference core with a bipolar process technology. The DBZ (SOT-23-3) package is pin-compatible with the industry-standard TL431/TL432 footprint but with an inverted pinout, where the reference terminal is pin 2 instead of pin 1. The device is qualified across the -40C to +125C operating range and is offered in tape and reel packaging for high-volume manufacturing. Typical applications include secondary-side regulation in isolated DC-DC converters, adjustable precision voltage monitoring, precision current limiting, threshold detection in comparators, and low-power analog bias generation in battery-powered IoT and portable industrial equipment. When designing with the ATL432LIBIDBZR, ensure the cathode current stays within the minimum/maximum limits under all operating conditions and place the device close to the load to minimize parasitic resistance. This page synthesizes TI datasheet parameters, distributor pricing, and practical design notes into a single reference not found in the manufacturer datasheet alone.
LM385M3X-1.2/NOPB - 1.235V Micropower Shunt Voltage Reference | Texas Instruments
The Texas Instruments LM385M3X-1.2/NOPB is a 1.235 V micropower two-terminal band-gap shunt voltage reference diode, supplied in a 3-pin SOT-23 (DBZ) surface-mount package. It operates over a 10 µA to 20 mA cathode current range with ±1 % to ±2 % initial output tolerance and a typical 1 Ω dynamic impedance, making it suitable for low-power precision analog designs. A shunt voltage reference is a two-terminal (cathode + anode) device that maintains a fixed reverse voltage across its terminals once biased above its minimum operating current, much like a temperature-compensated Zener diode. Shunt references sit within the broader hierarchy of voltage reference ICs, which in turn belong to power management and precision analog product families. They are commonly used as low-cost substitutes for buried-Zener or series-mode references in cost-sensitive, low-power applications. Key features include a 150 ppm/°C (max) low temperature coefficient, 1.235 V nominal output, an exceptionally low operating current floor of 10 µA that enables battery-life designs, and on-chip trimming for production-time accuracy. The DBZ SOT-23-3 footprint occupies roughly 7 mm² of PCB area and is compatible with TI's broader LMx85-1.2 reference family. The LM385-1.2-N series uses a band-gap architecture with on-chip trim, producing a stable 1.235 V reference across temperature. The 1 Ω dynamic impedance translates to less than 1 mV of additional error when cathode current varies by 1 mA, which is sufficient for ADC references, threshold detectors, and comparator-set switching thresholds. Typical applications include portable battery-powered meters, threshold detectors in comparator circuits, ADC reference rails in low-cost microcontrollers, and micropower regulators where the 1.235 V reference is amplified to higher rails. When designing with this part, pair it with a bias resistor sized to deliver 10 µA to 20 mA across the supply range. A 0.1 µF bypass capacitor across the reference often improves transient noise immunity. This page synthesizes distributor pricing, parametric comparison tables, drop-in alternatives and practical design notes not found in a single manufacturer datasheet, giving the engineer a one-stop reference for sourcing and qualifying the LM385M3X-1.2/NOPB.
LM385Z-1.2RAG - 1.235V Micropower Shunt Voltage Reference | onsemi
The onsemi LM385Z-1.2RAG is a micropower two-terminal bandgap shunt voltage reference diode that provides a fixed nominal output of 1.235 V with an initial tolerance of -2.4% to +2.01%, operating over a wide current range of 10 uA to 20 mA in a TO-92-3 (through-hole) package. Designed for ultra-low-power applications, the device guarantees a 1% initial voltage tolerance, 1 ohm dynamic impedance, and exceptional long-term stability over time and temperature. A shunt voltage reference is a two-terminal device that maintains a constant voltage across its terminals when biased with a current above its minimum operating point. Within the broader power management hierarchy, the LM385Z-1.2RAG belongs to the family of voltage reference ICs, which sit alongside voltage regulators, supervisors, and DC-DC converters as foundational analog building blocks. Bandgap-based shunt references such as the LM385Z-1.2RAG are valued for their low noise floor, stable temperature coefficient, and ability to operate from very low cathode currents, making them ideal for battery-powered systems where quiescent draw directly impacts battery life. Key features include a guaranteed 1% initial voltage tolerance, low dynamic impedance of 1 ohm, a temperature coefficient of 80 ppm/degree C typical, very low power consumption suitable for battery operation, and stable operation over time. The TO-92-3 through-hole package allows easy insertion into standard 0.1 inch pitch prototyping boards and is well suited to hand-soldered and wave-soldered assemblies in commercial-grade designs. From an architectural perspective, the LM385Z-1.2RAG uses a bipolar bandgap reference cell. On-chip trimming tightens the initial voltage tolerance, while the internal design minimizes dynamic impedance so that output voltage stays flat as cathode current varies. The wide operating current range (10 uA to 20 mA) gives designers flexibility to trade off power consumption versus reference stability, and the bipolar process technology delivers predictable temperature performance across the commercial 0 to 70 C range. Typical applications include portable meter references, portable test instruments, battery-operated systems, and current-loop instrumentation. The wide current range and low minimum operating current make it especially well suited to energy harvesting and remote sensor nodes where the reference must remain stable at microamp-level bias. When designing with the LM385Z-1.2RAG, ensure cathode current stays above 10 uA at all times and below 20 mA to remain within the guaranteed specification window. A bias resistor selected from the upstream supply sets the operating point, and a decoupling capacitor placed close to the device helps suppress noise on the reference rail. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single-page decision view for selecting and sourcing the LM385Z-1.2RAG.
LM4040AIM3-2.5/NOPB - 2.5V Shunt Voltage Reference | Texas Instruments
The Texas Instruments LM4040AIM3-2.5/NOPB is a precision micropower shunt voltage reference providing a fixed 2.5 V reverse breakdown voltage with ±0.1% initial accuracy (A-grade), 15 mA maximum cathode current, and 100 ppm/°C temperature coefficient in a 3-pin SOT-23 (DBZ) package. It belongs to the LM4040-N family of fixed-output band-gap shunt references. A shunt voltage reference is a two-terminal (plus a third pin for the SOT-23 package outline) analog building block that operates like a precision zener diode. When biased with a small current sourced through a series resistor from a higher supply rail, it produces a stable, low-noise reference voltage. Within the broader hierarchy, the LM4040 sits below adjustable references (e.g., LM4041) and series references (e.g., TL431) and above simple zener diodes, providing far better temperature stability, lower noise, and tighter initial tolerance for analog signal-chain design. Key features of the LM4040AIM3-2.5/NOPB include ±0.1% initial accuracy (A-grade), 100 ppm/°C maximum temperature coefficient, 45 µA typical cathode current, low dynamic impedance, and stable operation with any capacitive load - no external stabilizing capacitor is required. The fixed 2.5 V output is compatible with 12-bit and 16-bit ADC full-scale references and is a common system reference in mixed-signal designs. The device uses a band-gap core that compensates curvature across temperature, achieving 100 ppm/°C drift from -40 °C to +125 °C. The SOT-23-3 (DBZ) package is approximately 50% smaller than comparable SC70 packages from some second sources, freeing PCB area for space-constrained designs such as portable instrumentation. Typical applications include ADC/DAC reference rails, precision threshold detectors, battery monitoring in portable equipment, power-supply supervisory circuits, and loop control for industrial sensors. The fixed 2.5 V output maps directly onto many ADCs whose LSB quantization matches this reference. When biasing the LM4040AIM3-2.5/NOPB, choose a series resistor that supplies at least 45 µA at minimum cathode current and limits the current to under 15 mA across all input and temperature conditions. Place the device close to the load to minimize ground-loop noise. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, enabling faster selection and second-source qualification for production engineers.
LM4040B25FTA - 2.5V 0.2% Shunt Voltage Reference | Diodes Inc
The Diodes Incorporated LM4040B25FTA is a precision micropower shunt voltage reference that provides a fixed 2.5 V output with ±0.2% initial accuracy and a low 20 ppm/°C typical temperature coefficient, supplied in a 3-pin SOT-23 surface-mount package. The device operates as a two-terminal shunt reference over a 60 µA to 15 mA cathode current range and is stable with all capacitive loads, eliminating the need for an external compensation capacitor. It is rated for -40 to 125°C junction temperature operation, with a -40°C to 85°C ambient operating range, and supports AEC-Q100 automotive screening when ordered with the Q suffix (LM4040Q family). A shunt voltage reference is a two-terminal device that regulates voltage by steering excess current to ground, similar to a Zener diode but with much tighter initial accuracy, lower dynamic impedance, and a lower temperature coefficient. Shunt references belong to the broader voltage-reference category, sitting in the signal-chain hierarchy as the precision calibration source for ADCs, DACs, regulators, and instrumentation. They are typically biased by the load current itself or by a separate resistor from a higher supply rail, and they draw whatever current is necessary to hold VOUT constant. Key features include 4 mV typical cathode voltage tolerance, 1 mA test current for specification, very low dynamic impedance across the operating current range, and excellent long-term stability. The part is offered in industry-standard SOT-23-3 packaging with pinout that is compatible with TI LM4040 and TI LM4040-N families, simplifying second-source design. The Diodes Incorporated version is described by the manufacturer as a pin-for-pin compatible alternative to the TI LM4040 voltage reference. The internal bandgap reference cell and trimmed thin-film resistors deliver precision performance in a wide variety of operating conditions. The architecture is a low-noise bandgap with curvature correction and dynamic-element matching, which yields the low 20 ppm/°C drift and tight initial accuracy. This translates to reliable ADC measurement accuracy over temperature and simplifies the analog front-end calibration in instrumentation, where heavy switch-mode supply noise can degrade accuracy. Typical applications include ADC and DAC reference inputs, portable battery-powered equipment, notebook computers, cell phones, solar-powered systems, precision regulators, and automotive powertrain and chassis electronics where AEC-Q100 variants are required. The wide 60 µA to 15 mA cathode current range makes the LM4000B25FTA particularly well-suited for both low-power battery monitors and higher-current industrial loops. When designing with this part, choose the bias resistor so that the cathode current stays between 60 µA and 15 mA across all load and temperature conditions. The device is stable with any capacitor on the cathode, including 0 µF (no bypass), so PCB designers do not need to add a minimum ESR capacitor as a voltage reference, simplifying the BOM. For best noise performance, place the device close to the load and use a low-impedance ground return. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet.
LM4040D25FTA - 2.5V Shunt Voltage Reference, ±1%, 15mA
The Diodes Incorporated LM4040D25FTA is a precision micropower shunt voltage reference that provides a fixed 2.5 V output with ±1% (D-grade) initial accuracy in a 3-pin SOT-23 surface-mount package. It operates as a two-terminal shunt reference over a 60 µA to 15 mA cathode current range, dissipating up to 330 mW, and uses a bandgap core that is highly tolerant of capacitive loads so no output capacitor is required. The LM4040D25FTA is pin-for-pin compatible with the legacy LM4040-2.5 family and offers low dynamic impedance of typically 0.5 ohm at 1 mA. A shunt voltage reference is a two-terminal device that behaves like a precision zener diode: current flows through it in the reverse direction and the device holds its terminal voltage constant over a wide range of operating current. Compared with a series (3-terminal) reference such as the TL431, the LM4040 is simpler — no feedback resistors, no minimum dropout voltage drop across a series pass element — and is the standard building block for power management ICs -> voltage references -> shunt references. Its sub-1 mA quiescent capability makes it ideal for battery-powered and micropower designs. Key features include ±1% initial tolerance at +25 °C (D-grade), typical 20 ppm/°C temperature coefficient, 45 µVrms output noise (10 Hz to 10 kHz), and excellent line/load stability. The SOT-23-3 footprint occupies roughly 8 mm² of board area, making the device the smallest precision reference in the LM4040 family. Operating temperature range is -40 °C to +85 °C (commercial) or -40 to +125 °C (automotive Q-grade, see LM4040Q datasheet). Architecturally, the LM4040 uses a curvature-compensated bandgap reference with on-chip op-amp buffering, then presents the buffered reference at the cathode pin. The two-terminal topology is the simplest reference architecture: the user simply chooses a series resistor from the supply rail, sized so that the worst-case quiescent and load current together keep the device above 60 µA and below 15 mA across temperature. Because the bandgap loop is internally compensated, the device is unconditionally stable with 0 nF to 10 µF of load capacitance — a major advantage over many 3-terminal LDOs repurposed as references. Typical applications include ADC and DAC reference inputs, precision threshold detectors, solar/battery monitoring circuits, instrumentation loop power, and as a precision reference for 4-20 mA loops. Designers should also use the LM4040 as a stable pull-up for opto-isolators or as a low-noise reference for portable instrumentation where TL431 quiescent current is excessive. For audio or RF signal chains the 45 µVrms noise is adequate for most 16-bit systems; for higher resolution consider the LT1460 or ADR45xx families. When designing with this device, calculate the series resistor for worst-case supply, load, and temperature so the LM4040 stays above 60 µA and below 15 mA. A 1 mA midpoint with a 5 V supply and 2.5 V reference drops 2.5 V across a 2.5 kΩ resistor, dissipating 2.5 mW. Reverse-polarity protection on the supply side is recommended if the input can be replaced. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
LT1236ACS8-5 - 5V Precision Buried Zener Reference | Analog Devices
The Analog Devices LT1236ACS8-5 is a precision, low-noise buried-Zener voltage reference delivering a fixed 5.000 V output with ±0.05% initial accuracy and 10 mA of source/sink capability in an 8-pin SOIC package. The device combines ultralow drift, low wideband noise and excellent long-term stability without using on-chip heaters, making it a drop-in upgrade for legacy 5 V references such as the LT1021-5 and AD586 family. What is a buried-Zener voltage reference? A buried-Zener reference uses a subsurface avalanche breakdown junction rather than a bandgap or surface Zener. The subsurface architecture eliminates surface breakdown noise and stability problems, and delivers better temperature drift and time stability than even the best bandgap references. In the power-management IC hierarchy, voltage references sit alongside LDO regulators, supervisors and ADC/DAC converters, providing the precision DC anchor that every high-accuracy analog signal chain requires. Key specifications include 5 ppm/°C maximum temperature coefficient (C-grade), 4 ppm p-p noise (0.1 Hz to 10 Hz), 1.5 µVrms wideband noise, ±0.05% initial accuracy, 10 mA output current with source/sink capability, and 7.2 V to 40 V supply range. The LT1236 series is also nearly immune to input voltage variations due to its high PSRR. Architecturally, the LT1236 uses an on-chip buried-Zener diode, a temperature-compensation network, and a buffered output stage capable of both sourcing and sinking current. The dual output-capable topology allows the 10 V variant to operate as a shunt regulator (two-terminal Zener) with the same precision specifications, while the 5 V variant operates as a series reference with VIN headroom of 7.2 V minimum. Typical applications include high-resolution 16-/18-bit ADC and DAC reference inputs, precision instrumentation and digital multimeters, industrial process control loops, weigh scales and strain-gauge bridges, and precision voltage regulators. Designers also use it as a system-wide calibration reference in test-and-measurement equipment. When designing with the LT1236ACS8-5, respect the 7.2 V minimum supply and use a 1 µF to 10 µF output capacitor close to the VOUT pin for stability. Decouple VIN with 0.1 µF in parallel with 1 µF, keep trace capacitance on the noise-reduction (NR) pin minimal, and avoid sinking more than 10 mA continuously to prevent self-heating drift. This page synthesizes Analog Devices datasheet specifications, distributor pricing, drop-in cross-references and practical PCB design notes that are not found in the standalone manufacturer datasheet PDF, giving engineers a single source for selection, sourcing and board-level implementation.
LT1461CIS8-5 - 5V 100mA Micropower LDO Voltage Reference | ADI
The Analog Devices LT1461CIS8-5 is a fixed 5V output, micropower precision low-dropout series voltage reference IC delivering up to 100 mA of output drive in an 8-pin SOIC package. It combines ±0.08% initial accuracy with low temperature drift and draws only 35 µA of quiescent supply current, making it ideal for battery-powered and precision instrumentation designs. A series voltage reference is a three-terminal device that maintains a stable, temperature-independent output voltage independent of supply, load, and temperature variations. It sits at the bottom of the power management hierarchy, below linear regulators and DC-DC converters, and serves as the precision voltage anchor for ADCs, DACs, and precision data-acquisition systems. Voltage references are characterized by initial accuracy (error at 25 °C), temperature coefficient (drift in ppm/°C), long-term stability, noise density, and load/line regulation. Key specifications of the LT1461CIS8-5 include ±0.08% initial output accuracy (max), a low dropout of approximately 0.45 V at 100 mA load, 35 µA quiescent current, and high output drive capable of sourcing 100 mA continuously. Curvature-compensated bandgap architecture and trimmed thin-film resistors achieve the headline accuracy without external calibration, while the wide input supply range supports single-cell Li-Ion to industrial 24 V bus operation with adequate headroom. The LT1461 uses advanced curvature-compensated bandgap architecture with precision-trimmed thin-film resistors. This topology eliminates the typical parabolic temperature error of uncompensated bandgap references, resulting in low drift over the full industrial temperature range. The high output drive and low supply current are unusual to find together, and the device's tight line/load regulation keep the 5V reference stable under dynamic load transients. Typical applications include precision ADC and DAC reference inputs, industrial process control loop references, battery-powered instrumentation, portable data loggers, and automotive sensor signal conditioning. Its 100 mA drive also allows it to directly power multiple low-current analog rails in distributed measurement systems. When designing with this device, ensure the input supply provides at least 0.45 V of dropout headroom above 5 V under worst-case load. A 0.1 µF to 1 µF ceramic bypass capacitor placed close to the supply pin and a 1 µF to 10 µF output capacitor are recommended to ensure stability and to minimize load-transient ringing. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not consolidated in any single manufacturer datasheet, giving engineers a single source to evaluate the LT1461CIS8-5 for new designs and as a drop-in replacement on existing PCBs.
LT1461DHS8-5#PBF - 5V Micropower Precision LDO Voltage Reference | Analog Devices
The Analog Devices LT1461DHS8-5#PBF is a fixed 5 V, micropower precision low-dropout series voltage reference in an 8-pin NSOIC-8 (SOIC-8) surface-mount package, combining ±0.15% initial accuracy with low drift and 50 mA minimum output drive. It is part of the LT1461 series of band-gap references that use advanced curvature compensation and precision thin-film resistors to deliver trimmed high output accuracy. The "#PBF" suffix designates a lead-free, RoHS-compliant termination finish supplied on a tube. A voltage reference IC is a precision circuit that produces a stable, known DC voltage used as an absolute reference for ADCs, DACs, power supplies, and sensor signal-conditioning paths. Within the power management IC family, series-mode references are preferred over shunt references when the load current varies, because the regulator absorbs the difference between input and load current and rejects upstream supply noise. The LT1461 family targets micropower systems that require tight initial accuracy without the quiescent-current penalty of larger references. Key specifications include a maximum temperature coefficient of 20 ppm/°C, 0.15% maximum initial accuracy, 50 µA maximum supply current, and 50 mA minimum source current with low dropout operation. The series reference architecture supports output drive and sink capability, and the 8-pin SOIC-8 package provides a familiar footprint that simplifies PCB layout. The shutdown pin (pin 3) reduces quiescent current to <10 µA when pulled low, enabling power-sequenced systems to disable the reference. The internal band-gap core combined with curvature compensation and laser-trimmed thin-film resistors yields a temperature coefficient that is held to 20 ppm/°C maximum over the full -40 °C to +125 °C operating range. The low 35 µA typical quiescent current extends battery life in portable instruments, while the 50 mA output drive allows the reference to power multiple ADC/DAC channels or precision analog blocks directly without buffering. Typical applications include precision data-acquisition system references, 16-bit and 18-bit ADC/DAC voltage rails, industrial process-control transmitters, battery-powered handheld test equipment, and medical instrumentation front-ends. Designers use the LT1461DHS8-5 when a 5 V reference must be derived from a higher system rail such as 12 V or 15 V with high PSRR to upstream noise. Designers should place a 0.1 µF bypass capacitor close to the input and a 1 µF to 10 µF low-ESR capacitor on the output to maintain stability and minimize load-transient response. The shutdown pin must be tied to VIN or left floating for normal operation; leaving it grounded disables the reference. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in a single manufacturer datasheet, providing an at-a-glance comparison to help engineers select between the LT1461DHS8-5 and competing 5 V references.
LT1790BCS6-5 - 5V Micropower SOT-23 Voltage Reference | Analog Devices
The Analog Devices LT1790BCS6-5 is a fixed 5V output, micropower low-dropout (LDO) series voltage reference in a 6-pin TSOT-23 (S6) package. The 'B' grade delivers ±0.1% initial output accuracy with a low temperature coefficient of 25 ppm/°C and an output current capability of up to 5 mA, making it one of the most accurate small-package references in the LT1790 family. A voltage reference IC is a precision circuit that produces a stable, temperature-independent DC voltage used as a calibration anchor for ADCs, DACs, power-supply monitors, and sensor signal-conditioning paths. Within the power-management hierarchy, references sit alongside voltage regulators and supervisors, providing the absolute voltage standard against which other rails are measured. The LT1790 family combines a buried-Zener or bandgap-style core with curvature compensation and trimmed precision thin-film resistors to deliver low drift, low noise, and very low quiescent current in a footprint compatible with portable and space-constrained designs. Key features of the LT1790BCS6-5 include a low dropout voltage suitable for low-headroom rails, a supply current typically under 60 µA, low output noise, and reverse-battery protection. The 'B' grade's 25 ppm/°C drift makes it well suited to instrumentation that must hold calibration across temperature swings without an external chopper amplifier. Because each part is post-package trimmed, the as-shipped accuracy specification is guaranteed without user adjustment, simplifying factory calibration steps in high-volume builds. Typical applications include precision ADC and DAC reference rails, industrial process-control signal chains, battery-powered instrumentation, automotive sensor modules, and portable medical devices. Designers also use the LT1790BCS6-5 as a stable bias source for precision current loops and as a low-cost upgrade for legacy 5V reference designs that need tighter initial accuracy and better long-term stability. A key design consideration is output-capacitor selection. The TSOT-23 part requires careful bypassing close to the output pin to maintain phase margin, and the load current must remain inside the 5 mA envelope to preserve regulation and temperature performance. A short, low-ESR trace from the reference to the load pin reduces dynamic error when the load is an ADC reference input. This page synthesizes verified distributor pricing, pin-compatible SOT-23 reference alternatives, and application-specific design guidance not present in the standalone Analog Devices datasheet.
LT6657AHMS8-5#PBF - 5V 1.5ppm/°C Low Noise Series V-Ref | ADI
The Analog Devices LT6657AHMS8-5#PBF is a precision series voltage reference IC delivering a fixed 5 V output with ±0.1 % initial accuracy, 1.5 ppm/°C maximum temperature drift, and 0.5 ppm peak-to-peak noise in an 8-pin MSOP package with exposed pad. The device sources up to 10 mA and sinks up to 10 mA (per the LT6657 family datasheet), making it a versatile buffered reference for both ADC/DAC rails and instrumentation front ends. A series voltage reference is a type of precision shunt reference that internally regulates the output using an active buffer, providing a much lower dropout than classic Zener or two-terminal shunt topologies. Within the broader taxonomy, a series reference falls under voltage reference -> power management IC -> semiconductor. The buffered output allows direct connection to high-imprecision ADC reference pins, instrumentation amplifier reference nodes, and precision data-acquisition analog supplies, eliminating the need for an external op-amp buffer stage. Key features of the LT6657 family include advanced curvature compensation that gives predictable drift behavior across the full -40 °C to +125 °C operating range, very low temperature-cycling hysteresis (helping long-term system stability), and a wide operating supply range of up to 36 V (per the LT6657 datasheet). The combination of low noise, low drift, and high output current makes the LT6657AHMS8-5#PBF especially attractive for industrial instrumentation, weigh scales, precision medical monitors, and laboratory data loggers. The device is built on a BiCMOS process that integrates a precision bandgap cell with curvature-compensation circuitry and a low-noise output buffer. Compared to legacy buried-Zener references, the LT6657 family offers lower quiescent current draw, no heater-zener warm-up drift, and substantially better long-term stability, while still achieving comparable noise performance. Typical applications include precision 16-bit to 20-bit ADC reference supplies (e.g., driving SAR and sigma-delta converter REFIN pins), high-resolution DAC reference inputs, 4 mA to 20 mA loop transmitters, industrial pressure and temperature transmitters, bench-top multimeter reference rails, and medical instrumentation front ends where reference accuracy directly impacts clinical readings. When designing with the LT6657AHMS8-5#PBF, add 0.1 µF to 10 µF decoupling close to the supply pin and a 1 µF to 10 µF output capacitor for stable regulation. The exposed thermal pad must be soldered to the PCB ground plane to meet the datasheet's thermal specifications. This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers quickly select and source the LT6657AHMS8-5#PBF.
REF102AU - 10V Precision Voltage Reference, 2.5ppm/°C | Texas Instruments
The Texas Instruments REF102AU is a precision 10V series voltage reference IC delivering ±0.1% initial accuracy and a maximum temperature drift of 2.5 ppm/°C, housed in an 8-pin SOIC (D) package. It supplies up to 10 mA of output current from a single 11.4V to 36V supply, with extremely low sensitivity to line and load variations. A series voltage reference (also called a shunt-mode or series-mode voltage reference) is a precision analog building block that maintains a stable DC output voltage regardless of supply ripple, load current changes, or temperature drift. Within the broader power-management hierarchy, a voltage reference sits above a generic voltage regulator and below a system-level power supply: regulators provide bulk rails, while references provide the calibration-grade voltage against which ADCs, DACs, and weighing scales are measured. The REF102AU belongs to TI's Burr-Brown precision analog lineage, where the output is trimmed at the wafer level using laser or zener-zap techniques to reach sub-ppm-per-degree stability. Key features include a noise voltage of 5 µVPP (0.1 Hz to 10 Hz, the so-called peak-to-peak low-frequency noise band), a load regulation of 10 ppm/mA typical, and a long-term stability of 5 ppm/1000 hrs. The device also integrates a noise-reduction pin (NR) where an external capacitor forms a low-pass filter to attenuate broadband thermal noise. Industrial-grade operating temperature is -25 °C to +85 °C, with MSL Level-2-260 °C-1 YEAR moisture sensitivity. At the circuit level, the REF102AU uses a buried-zener bandgap architecture followed by a precision op-amp output buffer, allowing the reference to source and sink current while preserving accuracy. The output can be trimmed ±100 mV via the Trim pin without measurable drift penalty. This combination makes the part attractive where stability over time and temperature matters more than absolute cost. Typical applications include 16-bit and higher-precision ADC/DAC reference rails, industrial weighing scales, digital multimeters, laboratory calibrators, and precision current-loop (4-20 mA) transmitters. Medical imaging front-ends and seismic-data acquisition systems also benefit from its low 1/f noise. When designing with this part, always place a 1 µF to 10 µF low-ESR tantalum or ceramic bypass capacitor on the output and a 1 µF capacitor on the NR pin to achieve the rated noise performance. Do not exceed 36 V on the input, and decouple the supply within 5 mm of the IN pin to suppress line-induced noise. This page combines distributor pricing, drop-in alternatives, and practical design notes not collected in any single distributor listing, providing unique value beyond a raw datasheet PDF.
REF3030AIDBZT - 3V 50ppm/°C Low-Dropout Voltage Reference | Texas Instruments
The Texas Instruments REF3030AIDBZT is a precision, low-power, low-dropout series voltage reference IC delivering a fixed 3.0 V output with ±0.2% initial accuracy and a maximum temperature drift of 50 ppm/°C, housed in a 3-pin SOT-23-3 surface-mount package. It supports up to 25 mA of output current and operates from a maximum quiescent current of 50 µA, making it well suited to battery-powered and portable designs. The reference family is specified over the -40 °C to +125 °C industrial temperature range and ships on 7-inch tape-and-reel packaging. A voltage reference IC is a precision analog building block whose function is to generate a stable, temperature-invariant DC voltage used as the absolute scale against which ADC conversions, DAC outputs, sensor signals, and power-supply thresholds are measured. Voltage references sit within the broader power-management and signal-chain hierarchy: voltage reference → series/shunt reference → power management IC → semiconductor. In precision data-acquisition and instrumentation systems, the reference's initial accuracy and temperature drift directly bound the achievable system accuracy, which is why low-drift parts such as the REF3030AIDBZT are favored over on-chip MCU references. Key differentiating features of the REF3030AIDBZT include 50 ppm/°C maximum drift, 25 mA output current capability from a SOT-23-3 footprint, 50 µA maximum quiescent current, and operation with no required output load capacitor (although it is stable with any capacitive load). The reference offers a low dropout suitable for direct regulation from low-voltage rails, and the SOT-23-3 package suits space-constrained PCB layouts where larger SOT-23-5 or SOIC-8 references will not fit. Architecturally, the REF3030AIDBZT uses a CMOS bandgap core trimmed at wafer level to achieve ±0.2% initial accuracy and tight temperature drift. The 25 mA output is enabled by an integrated series pass element that also defines the dropout characteristic. Compared with shunt-mode references (e.g., LM4040), the series topology avoids the additional series resistor and the associated quiescent-current overhead, which is critical in low-power designs. Typical applications include ADC/DAC reference rails in portable data loggers, battery-powered instrumentation, industrial sensor signal conditioning, threshold detectors, and precision comparators. The low 50 µA quiescent current makes the part especially attractive for IoT edge nodes and remote sensor transmitters that spend long periods in sleep. When designing with the REF3030AIDBZT, observe the absolute maximum input voltage rating, bypass the supply pin with a 0.1 µF ceramic capacitor placed close to the IC, and verify that the load current does not exceed 25 mA. The part is stable with any capacitive load including zero, simplifying the output filter network.
TL431BMFDT - 2.495V Adjustable Shunt Regulator | Nexperia
The Nexperia TL431BMFDT is a three-terminal adjustable precision shunt voltage reference and regulator with an adjustable output voltage range from Vref = 2.495 V up to 36 V, set by two external resistors, in a 3-pin SOT-23 (TO-236AB) surface-mount package. It delivers ±0.5% reference tolerance (B grade) and sinks up to 100 mA of cathode current across an operating temperature range of -40C to +125C. A shunt regulator, also called a shunt voltage reference, is a two-state device that maintains a constant voltage across its terminals by sinking excess current. Within the power management hierarchy, it sits alongside bandgap references and series regulators as a fundamental building block for voltage monitoring, feedback loops, and precision thresholding. Because it behaves like an error amplifier with an integrated 2.495 V reference, the TL431 family is the de facto standard feedback element in isolated and non-isolated switching power supplies. Key features include the tight 0.5% initial reference tolerance at 25C, the wide 36 V maximum cathode voltage, and a low dynamic output impedance. The TL431xBM series is qualified for automotive applications, and the device requires only about 1 mA of minimum cathode current for regulation in typical designs, keeping standby losses low. Technically, the device integrates a 2.495 V bandgap reference, an internal op amp, and an open-collector output transistor. When the voltage at the reference pin exceeds 2.495 V, the cathode conducts and pulls the cathode pin toward the anode, making the part function as a single-supply comparator with a built-in precision reference. Temperature coefficient is approximately 888 ppm/C per third-party parameter listings. Typical applications include optocoupler feedback in flyback and forward SMPS converters, adjustable voltage monitors and overvoltage crowbar triggers, precision current sources and sinks, and setpoint generation for battery charger circuits. A key design consideration is stability: with certain cathode-to-reference capacitance ranges the loop can oscillate, so verify the recommended stability region in the Nexperia datasheet and add a compensation capacitor or series resistor if operating near the boundary. This page synthesizes distributor pricing, drop-in cross-references, and practical design notes not found in the manufacturer datasheet.
TL432AIL3T - 2.495-36V Adj Shunt V-Ref, 1%, SOT-23-3 | STMicroelectronics
The STMicroelectronics TL432AIL3T is an adjustable shunt voltage reference in a 3-pin SOT-23-3 (L3T) surface-mount package, offering a programmable output of 2.495 V to 36 V with 1% voltage tolerance and 100 mA cathode current capability. It features a typical output impedance of 0.22 ohm and operates across an automotive-grade temperature range of -40 C to +125 C. A shunt voltage reference is a two-terminal device that behaves like a programmable Zener diode: when biased with a current source above its minimum cathode current (typically 1 mA), it holds its cathode voltage at a precise reference value. The TL432 extends the classic TL431 family with a reverse pinout (cathode-anode-reference on pins 1-2-3 instead of reference-anode-cathode), enabling simpler PCB routing in many polarity-sensitive designs. The TL432 belongs to the broader class of linear voltage references - subcategory of power management ICs - sitting alongside series and shunt regulators. Key features include guaranteed temperature stability across the full automotive range, 100 mA continuous sink current capability, low typical output impedance of 0.22 ohm, and a sharp turn-on characteristic that makes it usable as a voltage comparator or error amplifier. The 1% voltage precision grade (A suffix) suits precision analog circuits, while the lower-cost B and C grades offer 1% and 2% tolerance for cost-optimized designs. The TL432 uses a buried-Zener bandgap architecture with on-chip temperature compensation. Output voltage is programmed by an external resistor divider: VOUT = VREF * (1 + R1/R2), where VREF = 2.495 V. The same die is offered in the TL431 family with mirrored pinout, allowing engineers to standardize on one footprint design. Typical applications include adjustable voltage regulators, switching power supply feedback loops, precision current sources, ADC/DAC reference rails, and automotive ECU voltage monitoring. The wide 2.495 V to 36 V output range and automotive temperature grade make it suitable for 12 V/24 V automotive subsystems and industrial 24 V bus systems. When designing with the TL432, always ensure cathode current stays between 1 mA (minimum) and 100 mA (maximum), and add a 0.1 uF bypass capacitor across the reference node when used in noisy switching environments. The SOT-23-3 package has a thermal resistance around 250 C/W, so continuous dissipation above 50 mW requires thermal analysis. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
TL432BSA-7 - Adjustable Shunt Reference, 36V, ±0.5%, SOT-23-3 | Diodes Incorporated
The Diodes Incorporated TL432BSA-7 is a three-terminal adjustable precision shunt regulator housed in a compact SOT-23-3 surface-mount package. It provides an adjustable output voltage from 2.495V to 36V with ±0.5% initial accuracy and supports cathode currents up to 100 mA, making it a versatile building block for precision reference and error-amplifier applications. A shunt voltage reference is a two-terminal device that maintains a fixed voltage across its cathode-anode terminals by sinking current to ground, analogous to a Zener diode but with much tighter tolerance, lower dynamic impedance, and better temperature stability. The TL432 family (and the related TL431 family) belongs to the broader category of programmable shunt regulators, which are key analog building blocks in power management, signal conditioning, and feedback loops. They occupy the same hierarchical role as bandgap voltage references, Zener references, and series voltage regulators, but differ by being driven by current rather than input voltage. Key features of the TL432BSA-7 include an adjustable reference voltage set by an external resistor divider, low dynamic output impedance across the operating current range, and a wide cathode operating current window from 1 mA to 100 mA. The TL432 pinout reverses the reference (REF) and anode (A) positions relative to the TL431, so it is NOT a drop-in pin replacement for TL431 footprints. The reference tolerance is graded by suffix: 'B' designates ±0.5%, 'A' designates ±1.0%, and standard is ±2.0%. The TL432BSA-7 uses a bandgap core stabilized by on-chip temperature-compensation circuitry to deliver a flat temperature coefficient across the full industrial -40 °C to +125 °C range. The low dynamic impedance (~0.5 ohm typical) and 100 mA cathode capability allow it to serve as both a precision reference and a feedback error amplifier in isolated and non-isolated switching power supply topologies. Typical applications include switching power supply feedback loops, precision constant-current sinks, adjustable voltage references in industrial control, ADC/DAC reference rails, battery chargers, and comparator-style overvoltage monitors. Its SOT-23-3 footprint also suits high-density analog boards where a TL431 TO-92 part would be too large. When designing with the TL432BSA-7, verify the pinout against the TL431 footprint on existing PCBs, since the REF and ANODE pins swap positions. Provide at least 1 mA of cathode bias current to keep the device in regulation, and bypass the reference pin with a 0.1 µF capacitor when noise-sensitive ADCs are tied to the reference ladder. This page synthesizes distributor pricing, drop-in alternatives sourced from the TL432 and TL431 pin-compatible families, and practical design notes not found in the manufacturer datasheet alone.
TL432LIBQDBZR - Adjustable 2.495V Shunt Reference, ±0.5% | TI
The Texas Instruments TL432LIBQDBZR is an adjustable precision shunt voltage reference featuring a 2.495V nominal reference and an input range of 2.495V to 36V in a SOT-23-3 (DBZ) package. It delivers ±0.5% initial cathode tolerance (B grade) at 25°C, a 15 mA maximum cathode current, and a 400 nA minimum cathode current, with optimized reference and deviation currents that improve system accuracy versus legacy TL431 designs. A shunt voltage reference is a two-terminal (or three-terminal with adjust) device that behaves like a non-inverting precision Zener diode. When biased with a resistor from a higher supply, it holds its cathode-to-anode voltage fixed at the programmed VREF, allowing any desired reference voltage to be set with external resistors. The TL432LI sits within the hierarchical group: shunt reference -> voltage reference -> power management IC -> analog semiconductor. It is functionally equivalent to the TL431 family but offers a different pinout in the SOT-23-3 package and improved IREF/Idev characteristics. Key features include adjustable cathode voltage from 2.495V up to 36V, a typical output impedance of 0.2 ohm, low cathode current of 400 nA min and 15 mA max, and operation across the automotive -40°C to +125°C range. The SOT-23-3 (DBZ) outline is footprint-compatible with the standard TL431/TL432 family, easing second-source sourcing. The TL432LI is also offered in 1% (A) tolerance grades for tighter designs. Technologically, the TL432LI uses a buried-Zener bandgap core with trimmed thin-film resistors to achieve tight initial tolerance and low temperature drift. The optimized IREF/Idev values minimize the error terms introduced by the feedback divider at low cathode currents, enabling high-accuracy closed-loop designs without the bias-induced errors seen in classic TL431 circuits. Typical applications include adjustable linear regulator feedback, switching-mode power supply (SMPS) error-amplifier reference, isolated point-of-load rails, automotive voltage monitors, and ADC/DAC precision references. The wide cathode operating range also makes it useful in high-voltage rails up to 36V. When designing with this part, remember the TL432LI pinout in the SOT-23-3 differs from the TL431 in the same package - pin 1 is REF, pin 2 is ANODE, and pin 3 is CATHODE. Verify orientation against the datasheet footprint before PCB reuse. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not offered as a single view on the manufacturer datasheet, helping engineers compare sourcing options and pinout compatibility at a glance.
TL432LIBQDBZRQ1 - Adjustable Shunt Reference, 0.5% | TI
The Texas Instruments TL432LIBQDBZRQ1 is an automotive-grade adjustable shunt voltage reference IC with 2.495 V nominal reference and adjustable output up to 36 V, packaged in a 3-pin SOT-23 (DBZ) with ±0.5% initial tolerance (B grade) and 15 mA cathode current capability. Per the manufacturer datasheet, the device belongs to the TL431LI-Q1/TL432LI-Q1 family with optimized reference current for lower minimum operating current and tighter thermal stability. A shunt voltage reference (also called a programmable zener reference) is a two-terminal or three-terminal device that maintains a fixed voltage at its cathode when biased with sufficient current. The three-terminal form adds a reference pin, allowing the cathode voltage to be programmed above the internal reference using an external resistor divider. The TL432 sits within the broader hierarchy of voltage references -> shunt regulators -> analog ICs -> power management semiconductors, and is commonly used in closed-loop feedback for switching power supplies, where it sets the output voltage set point. Compared to two-terminal zener diodes, three-terminal shunt references offer tighter initial tolerance, lower dynamic impedance, and programmability. Key features include an adjustable output voltage range from 2.495 V (VREF) to 36 V set by two external resistors, a typical output impedance of 0.2 Ω that minimizes set-point shift with cathode current, and an optimized reference current designed for low minimum cathode current (I_min) operation. The device is specified across the automotive temperature range, qualified to AEC-Q100 standards, and supports solder reflow up to 260 °C per JEDEC J-STD-020. Internally, the TL432 uses a bandgap reference core with on-chip op-amp drive to a pass transistor, providing stable VREF across temperature, supply, and load variations. The TL432 pinout is the reverse-polarity variant of the TL431: in the DBZ (SOT-23-3) package, the TL432 places the reference (REF) on pin 1, anode on pin 2, and cathode on pin 3, while the TL431 has anode on pin 1, cathode on pin 2, and reference on pin 3. Always verify pinout before substituting between TL431 and TL432. Typical applications include isolated flyback converter secondary-side regulation, primary-side regulation with optocoupler feedback, automotive battery monitoring, precision current limiting, and adjustable zener replacement. The TL432LI-Q1 variants (LI suffix) provide optimized reference current for lower I_min and tighter TI operation versus the standard TL431/TL432 parts. When designing with this device, ensure cathode current stays within the datasheet limits (typically 1 mA minimum, 15 mA continuous) across all load and temperature conditions. Add a 0.1 µF bypass capacitor at the reference pin if the divider impedance is high to prevent oscillation. This page synthesizes distributor pricing, AEC-Q100-qualified drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
TLV431ACDBVR - 1.24V-6V Adjustable Shunt Voltage Reference | TI
The Texas Instruments TLV431ACDBVR is a low-voltage 3-terminal adjustable precision shunt voltage reference with 1% initial accuracy, programmable output from 1.24V (VREF) to 6V via two external resistors, housed in a 5-pin SOT-23 (DBV) package. The A-grade bin specifies ±1% reference tolerance and 15 mA maximum cathode current capability. The device delivers a minimum cathode current for regulation of 100 µA (typical) with low dynamic impedance across the operating range, making it suitable for low-power analog rails where a precision reference is required. A shunt voltage reference (also called a programmable zener or 3-terminal shunt regulator) is a two-terminal device whose cathode-to-anode voltage is held at a defined value when the bias current supplied by an external resistor is greater than the minimum regulation current. Unlike series LDOs, shunt references operate in parallel with the load, sinking more current as the load demands less. They sit in the same broad category hierarchy as zener diodes -> shunt regulators -> voltage references -> power management ICs -> semiconductors, and are the low-voltage successor to the classic TL431. Key features of the TLV431ACDBVR include: typical output impedance of 0.25 ohm at 1 kHz that yields low AC noise on the regulated node, specified thermal stability over the commercial 0 to 70 C range (with the wider -40 to 125 C AC-grade option available), and operation from a wide cathode voltage of 1.24V to 6V. Its bipolar process technology gives well-behaved temperature drift and long-term stability, and the small SOT-23-5 footprint enables placement near the load it serves. The TLV431 architecture is essentially a bandgap reference driving a buffered pass transistor with an open-collector (open-cathode) output. Two external resistors set VOUT = VREF × (1 + R1/R2), giving designers continuous adjustment rather than fixed 2.5V or 5V taps. Because it sinks current, it pairs naturally with a series resistor fed from a higher supply, allowing isolated sub-rails in switch-mode power supply feedback loops and ADC/DAC reference inputs. Typical applications include switching-mode power supply (SMPS) secondary-side feedback, adjustable precision voltage references for data converters, isolated flyback/forward converter error amplifiers, and low-current linear regulators. The wide VREF-to-6V range makes it ideal wherever a clean sub-6V reference is needed without resorting to a low-dropout regulator. When designing with the TLV431, choose the bias resistor so that (VSUPPLY - VREF) / Rbias supplies at least IKA(min) (100 µA typical, 1 mA worst case) at minimum load, while staying below the absolute maximum cathode current of 15 mA. A 1 µF bypass capacitor across cathode-to-anode improves transient response. This page synthesizes distributor pricing, drop-in SOT-23-5 alternatives (TI TLV431 family and ON Semi TL431 family), and practical design notes not consolidated in a single TI datasheet document.
TLV431AE5TA - 1.24V Adj Shunt Reference ±1% | Diodes Inc
The Diodes Incorporated TLV431AE5TA is a precision low-voltage adjustable shunt voltage reference with a 1.24 V nominal reference and ±1% initial accuracy, supplied in a 5-pin SOT-25 (SC-74A, SOT-753) surface-mount package. The device operates over a wide cathode-to-anode range of 18 V maximum with programmable output voltage from VREF (1.24 V) up to 18 V set by two external divider resistors, and sinks up to 15 mA at 25°C in the Diodes datasheet specification. A shunt voltage reference is a three-terminal non-isolated regulator that maintains a fixed voltage between its reference and anode pins whenever the cathode-to-anode voltage exceeds the programmed output. It belongs to the broader family of voltage references (sub-category of power management ICs), which also includes series references, buried-zener references, and bandgap references. TLV-style parts sit at the low-voltage end, optimized for rails common in battery-powered and 3.3 V/5 V logic systems where classic 2.5 V/5 V TL431 references have insufficient headroom. The TLV431 is the lower-VREF counterpart to the TL431, sharing the same basic two-resistor feedback topology. Key features include ±1% voltage tolerance at 25°C, ±2.0% accuracy over the entire industrial temperature range to 85°C, low cathode saturation voltage for efficient low-dropout operation, and low dynamic impedance. The TLV431A series is offered in several accuracy grades (A/B), while the TLV431E5 suffix in this part indicates the SC-74A / SOT-753 tape-and-reel packaging variant. Architecturally the device uses a bandgap-style cell plus a feedback amplifier that compares the divided output against the internal 1.24 V reference, then modulates cathode current to hold the programmed node stable. Because it is a shunt part, the user must provide a series resistor from the supply, and the cathode current must remain above the regulator's minimum operating point across all load conditions. Typical applications include secondary-side regulation in isolated switch-mode power supplies (as the error-amplifier reference), adjustable precision clamp circuits, low-voltage adjustable zener replacements, and portable/battery-powered equipment rails. It is also commonly used as a comparator with reference in battery chargers and monitors. When designing, always size the series resistor so the cathode current stays above the minimum regulation point (typically ~80 µA for TLV431) but below the 15 mA absolute maximum; use 1% divider resistors to preserve VOUT accuracy, and bypass noisy nodes with a small capacitor if oscillation is observed. This page synthesizes distributor pricing, drop-in alternates, and practical design notes not found in the manufacturer datasheet alone.