TL432LIBQDBZR - Adjustable 2.495V Shunt Reference, ±0.5% | TI
MPN: TL432LIBQDBZR ✓ فعالTL432LIBQDBZR جائزہ
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.
کے لیے ڈراپ اِن متبادل TL432LIBQDBZR — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں TL432LIBQDBZR (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Operating Temperature Range, Reference Type, Output Voltage Range, Reference Voltage (Vref).
TL432BCDBZR
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
TL432ACLPR
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہ📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
TL432ACDBZR
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہ📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
TL431BQDBZR
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →ATL432LIBIDBZR
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →LM4040BIM3-2.5/NOPB
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
TL432LIBQDBZR تفصیلات
| Reference Type | Shunt Voltage Reference (adjustable) |
| Nominal Reference Voltage (VREF) | 2.495 V |
| Cathode Voltage Range | 2.495 V to 36 V |
| Initial Cathode Tolerance | ±0.5% (B grade, 25 °C) |
| Min Cathode Current (IKA min) | 400 nA |
| Max Cathode Current (IKA max) | 15 mA |
| Typical Output Impedance | 0.2 ohm |
| آپریٹنگ درجہ حرارت رینج | -40 °C to +125 °C (automotive) |
| Reference Current (IREF) | Optimized low-Iref design |
| Deviation Current (Idev) | Optimized low-Idev design |
| پیکیج | SOT-23-3 (DBZ) - 3-pin |
| ماؤنٹنگ ٹائپ | Surface Mount |
| Pinout (SOT-23-3) | Pin1=REF, Pin2=ANODE, Pin3=CATHODE (differs from TL431 in same pkg) |
| RoHS اسٹیٹس | Compliant |
TL432LIBQDBZR پن کنفیگریشن
| پن 1 | REF — Reference (program the output via external resistor divider) |
| پن 2 | ANODE — Anode (typically tied to ground) |
| پن 3 | CATHODE — Cathode (regulated output, sinks current) |
عام استعمالات
TL432LIBQDBZR کے لیے موزوں ہے 6 ایپلیکیشنs: Adjustable Linear Regulator Feedback, SMPS Error-Amplifier Reference, Automotive Voltage Monitor, Precision ADC/DAC Reference Buffer, Isolated Point-of-Load Rail, Battery Charger Termination Sensor.
Adjustable Linear Regulator Feedback
The TL432LIBQDBZR's 2.495V nominal VREF, ±0.5% B-grade initial tolerance, and 400 nA-15 mA cathode range make it ideal as the error-amplifier reference inside an adjustable linear regulator such as a discrete LM317-style design. Its 36V cathode rating supports input rails up to 36V including 24V industrial supplies and 12V-15V automotive feeds. Placed with a resistor divider on the REF pin, the low IREF/Idev of the LI variant keeps error from the divider below the part's own tolerance, yielding output accuracy within ±1% across load and temperature. Unlike a Zener diode, it also has a stable temperature coefficient curve for production-line consistency.
تجویز کردہ
SMPS Error-Amplifier Reference
In switch-mode power supplies the TL432LIBQDBZR serves as the precision reference at the inverting input of the primary-side opto-isolator feedback loop. With 2.495V-36V cathode capability and 0.2 ohm output impedance, it drives opto-coupler LED currents up to 10 mA with tight loop accuracy across line and load variations. The ±0.5% B-grade tolerance translates directly to ±0.5% output set-point accuracy when used with 1% feedback resistors, while the optimized IREF (sub-µA) means the resistor-divider error term is negligible. This reference is appropriate for isolated DC-DC converters, telecom bricks, and USB-PD secondary-side regulation loops.
تجویز کردہ
Automotive Voltage Monitor
The TL432LIBQDBZR suits automotive battery monitoring where the 12V-36V cathode range covers 12V cranking and 24V truck supplies. Its -40°C to +125°C operating range matches automotive under-hood environments, and the low 400 nA minimum cathode current enables continuous low-power monitor circuits that draw negligible quiescent current. Combined with a comparator and MOSFET, it forms a precision over-voltage or under-voltage cutoff for module protection. The 36V rating also tolerates load-dump transients when paired with a TVS clamp, making it a robust choice for ECU and sensor-supply supervision.
تجویز کردہ
Precision ADC/DAC Reference Buffer
When configured as a fixed 2.5V reference by shorting REF to CATHODE, the TL432LIBQDBZR delivers a low-impedance 2.495V rail suitable for ADC/DAC external reference inputs. The 0.2 ohm typical output impedance holds the reference voltage stable against transient ADC reference-pin currents during conversions, and the ±0.5% initial tolerance sets a predictable gain-error budget for 12-14-bit converters. The low Idev characteristic ensures that even at microamp loading levels the reference error contributed by the part itself remains well inside the ADC's calibration envelope, supporting data-acquisition and instrumentation designs.
تجویز کردہ
Isolated Point-of-Load Rail
On isolated secondary sides, the TL432LIBQDBZR provides local regulation feedback to a primary-side PWM controller through an optocoupler or digital isolator. Its 400 nA minimum cathode current draws little power from the post-transformer rail, while the 36V cathode ceiling tolerates wide rectified-DC input voltage excursions before the converter stabilizes its output. Designers often pair it with a TL431-type opto error amplifier for cost-sensitive industrial converters, but the TL432LI's optimized low-IREF design gives tighter load-regulation accuracy without changing the external component count.
تجویز کردہ
Battery Charger Termination Sensor
Inside a battery charger, the TL432LIBQDBZR detects the end-of-charge voltage and signals a microcontroller or charge-FET driver. With its 2.495V internal reference and external resistor divider, the trip point can be programmed to anything from a single Li-ion cell to a 12V SLA battery, while the 15 mA cathode current can directly drive indicator LEDs or small relays. The 36V cathode maximum covers even high-voltage battery stacks, and the low IREF/Idev ensures the threshold accuracy is not undermined by leakage in the divider network, giving reliable state-of-charge transitions in charging cycles.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا TL432LIBQDBZR — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | TL432BCDBZR | TL432ACLPR | TL431BQDBZR | TL432LI | LM4040BIM3-2.5/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOT-23-3 (DBZ) | SOT-23-3 (DBZ) - same | SOT-23-3 (DBZ) - same | SOT-23-3 (DBZ) - same outline, different pinout | SOT-23-3 (DBZ) - same | SOT-23-3 - same outline, different pinout |
| VREF Nominal | 2.495 V (adjustable) | 2.495 V (adjustable) | 2.495 V (adjustable) | 2.495 V (adjustable) | 2.495 V (adjustable) | 2.5 V (fixed, non-adjustable) |
| Initial Tolerance | ±0.5% (B grade) | ±0.5% (B grade) | ±1% (A grade) | ±0.5% (B grade) | ±0.5% (B grade) | ±0.2% (B grade fixed) |
| Cathode Voltage Range | 2.495 V to 36 V | 2.495 V to 36 V | 2.495 V to 36 V | 2.495 V to 36 V | 2.495 V to 36 V | Fixed 2.5 V |
| Min Cathode Current | 400 nA (optimized) | ~1 mA standard | ~1 mA standard | ~1 mA standard | 400 nA (LI optimized) | ~60 µA |
| Max Cathode Current | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA | 15 mA |
| Pinout (SOT-23-3) | Pin1=REF, Pin2=ANODE, Pin3=CATHODE | Identical (TL432 family) | Identical (TL432 family) | Different (TL431 family) | Identical (TL432 family) | Different (LM4040 family) |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
اہم امتیازی خصوصیات
- Optimized low-IREF/low-Idev design for higher closed-loop accuracy (بمقابلہTL432BCDBZR (standard IREF/Idev B-grade))
- Wide 36V cathode rating supports 24V industrial and 12V automotive rails (بمقابلہLM4040BIM3-2.5/NOPB (fixed 2.5V, limited cathode envelope))
- Same TI TL432-family pinout - different from TL431DBZ pinout (بمقابلہTL431BQDBZR (similar rating, different pinout))
ڈیزائن نوٹس
Do not reuse a PCB layout designed for TL431 in the SOT-23-3 footprint - the TL432LI uses a different pinout in the same outline (Pin1=REF, Pin2=ANODE, Pin3=CATHODE). Verify pin 1 marker against the TI TL432LI datasheet before placing the part, and use mirror-image layout or a footprint swap to avoid connecting the cathode to the REF node. Cross-reference the BOM line item with the variant-specific datasheet because TL431 and TL432 are NOT interchangeable even though many engineers assume they are drop-in equivalents.
Bias-resistor sizing: the cathode current must remain between 400 nA (IKAmin, optimized) and 15 mA (IKAmax) across all supply and load conditions. For a 24V input and a 5V programmed output, Rbias = (VIN - VKA) / IKA. Choose ~3 mA midpoint (R ≈ 6.4 kohm) for typical operation, then verify worst-case at +125 °C where IKAmin can rise. Add a minimum-load resistor on the output so the divider does not pull IKA below IKAmin when the load is open-circuit.
Layout: place the TL432LIBQDBZR close to the feedback divider and keep the REF node away from switching-noise sources. Use a small (1-10 nF) ceramic bypass from REF to ANODE if the divider resistance is high (>100 kohm) to reject coupled switching noise; otherwise leave REF unfiltered to preserve transient response. Provide a copper pour on the cathode to dissipate up to 0.5W briefly during fault conditions, since the SOT-23-3 can dissipate ~0.5W on a 1 oz 1 inch² pad.
تعمیل کی معلومات
RoHS and REACH compliance per distributor listings (DigiKey, Mouser, Heisener). Automotive grade variant needs explicit Q-suffix and AEC-Q100 grade confirmation from the TI datasheet before being used in automotive designs.
