LT1461DHS8-5#PBF - 5V Micropower Precision LDO Voltage Reference | Analog Devices
MPN: LT1461DHS8-5#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.4 | $6.40 |
| 10 | $5.78 | $57.80 |
| 100 | $5.12 | $512.00 |
| 500 | $4.55 | $2,275.00 |
| 1,000 | $4.1 | $4,100.00 |
LT1461DHS8-5#PBF Overview
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.
Drop-in alternatives for LT1461DHS8-5#PBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LT1461DHS8-5#PBF (same form factor and footprint) — differing in Initial Accuracy, Lead-Free / RoHS, Package, Reference Type, Supply Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LT1461AIS8-5
✅ Drop-In✓ In Stock
$3.72 / Unit
View Datasheet →LT1461DHS8-5#TRPBF
✅ Drop-In✓ In Stock
$4.21 / Unit
View Datasheet →LT1461CCS8-5#PBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADR4550BRZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
REF192GRUZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADR4540BRZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
LT1461DHS8-5#PBF Specifications
| Reference Type | Series Voltage Reference, Fixed |
| Nominal Output Voltage | 5 V |
| Initial Accuracy | ±0.15% (max) |
| Temperature Coefficient | 20 ppm/°C (max) |
| Supply Current | 50 µA (max) |
| Output Current (Source) | 50 mA (min) |
| Minimum Operating Supply Voltage | 5.5 V |
| Maximum Input Voltage | 20 V |
| Operating Temperature Range | -40 °C to +125 °C |
| Shutdown Pin Current | <10 µA (SHDN low) |
| Package | NSOIC-8 (SOIC-8, 8-pin) |
| Mounting Type | Surface Mount |
| Lead-Free / RoHS | Yes (PBF suffix) |
| Supplier Package | Tube |
LT1461DHS8-5#PBF Pin Configuration
| Pin 1 | VIN — Input supply voltage (5.5 V to 20 V) |
| Pin 2 | VOUT — Reference output (5.000 V fixed) |
| Pin 3 | SHDN — Shutdown, active-low (tie to VIN or float for normal operation) |
| Pin 4 | GND — Ground |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | NC — Not connected (per datasheet) |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | NC — Not connected (per datasheet) |
Typical Applications
LT1461DHS8-5#PBF is suitable for 6 applications: Precision Data Acquisition System Reference, Industrial Process-Control Transmitter, Battery-Powered Handheld Test Equipment, Medical Instrumentation Front-End, Precision DAC Reference for Audio Equipment, Automotive Sensor Signal Conditioning.
Precision Data Acquisition System Reference
The LT1461DHS8-5#PBF provides a stable 5.000 V reference for 16-bit and 18-bit ADC reference pins in precision data-acquisition systems, where ±0.15% initial accuracy and 20 ppm/°C drift directly limit measurement resolution. Its 50 mA output drive capability supplies multiple ADC channels simultaneously without an external buffer op-amp, simplifying BOM and reducing board area. The low 35 µA typical quiescent current keeps thermal dissipation under 1 mW at the reference node, preserving signal-chain accuracy in multi-channel data loggers and industrial PLC analog input modules.
Recommended
Industrial Process-Control Transmitter
In 4-20 mA HART and Foundation Fieldbus process transmitters, the LT1461DHS8-5#PBF establishes the absolute voltage reference against which the loop-current DAC is calibrated, ensuring 0.1% full-scale accuracy over industrial -40 °C to +85 °C ambient ranges. Its 50 mA drive and 5.5 V minimum supply allow operation directly from a 24 V loop with a simple resistor dropper. The 20 ppm/°C temperature coefficient holds calibration drift below ±0.05% over the operating range, meeting IEC 60770 industrial transmitter stability requirements.
Recommended
Battery-Powered Handheld Test Equipment
The LT1461DHS8-5#PBF is ideal for portable digital multimeters and handheld oscilloscope reference rails, where the 50 µA maximum quiescent current extends battery life by minimizing reference standby draw. The 5 V fixed output directly drives the reference pin of precision ADCs in 4.5-digit and 5.5-digit DMM front-ends without a separate buffer stage. The shutdown pin allows the reference to be disabled between measurement cycles, dropping supply current below 10 µA and preserving lithium-ion battery runtime over months of standby.
Recommended
Medical Instrumentation Front-End
Patient monitoring devices such as ECG, pulse oximeter, and infusion-pump controllers use the LT1461DHS8-5#PBF to provide the absolute voltage reference for analog signal-conditioning ADCs, where reference drift directly translates to vital-sign measurement error. The 5 V output and 50 mA drive supply both the instrumentation amplifier reference node and the ADC reference input simultaneously. The ±0.15% factory-trimmed accuracy supports IEC 60601-1 measurement repeatability requirements across the device operating life.
Recommended
Precision DAC Reference for Audio Equipment
High-fidelity audio DACs and digital crossovers use the LT1461DHS8-5#PBF as a clean, low-drift 5 V reference for DAC output-stage scaling and analog-domain volume control networks. The series-reference topology rejects upstream switching-converter ripple that would otherwise appear as 1/f noise on the audio output. The 50 mA drive allows the reference to feed multiple DAC channels directly while maintaining channel-to-channel gain match within ±0.15%, preserving stereo imaging in professional audio interfaces.
Recommended
Automotive Sensor Signal Conditioning
Automotive body controllers and battery-management systems use the LT1461DHS8-5#PBF to establish the absolute 5 V reference against which current-sense amplifiers and Hall-effect sensor signals are scaled. The -40 °C to +125 °C operating range covers under-hood and cabin environments, while the 50 mA drive supplies multiple sensor-conditioning channels from a single reference. The low-dropout architecture allows operation directly from a 12 V automotive battery rail after a simple pre-regulation stage.
Recommended
Recommended Products Summary
Engineering reference data for LT1461DHS8-5#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LT1461AIS8-5 | LT1461DHS8-5#TRPBF | LT1461CCS8-5#PBF | ADR4550BRZ-R7 | REF192GRUZ-REEL7 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | NSOIC-8 (SOIC-8) | NSOIC-8 (SOIC-8) - same | NSOIC-8 (SOIC-8) - same | NSOIC-8 (SOIC-8) - same | NSOIC-8 (SOIC-8) - same | NSOIC-8 (SOIC-8) - same |
| Output Voltage | 5.0 V | 5.0 V | 5.0 V | 5.0 V | 5.0 V | 5.0 V |
| Initial Accuracy | ±0.15% | ±0.05% (tighter) | ±0.15% | ±0.15% | ±0.05% (tighter) | ±0.1% |
| Temperature Coefficient | 20 ppm/°C max | 10 ppm/°C max | 20 ppm/°C max | 20 ppm/°C max | 10 ppm/°C max | 10 ppm/°C max |
| Quiescent Current | 50 µA max | 50 µA max | 50 µA max | 50 µA max | 700 µA typ | 45 µA max |
| Output Current (Source) | 50 mA min | 50 mA min | 50 mA min | 50 mA min | 10 mA min | 30 mA min |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | 0 °C to +70 °C | -40 °C to +125 °C | -40 °C to +85 °C |
| Pinout / Shutdown Pin | Pin 3 SHDN active-low | Pin 3 SHDN active-low (same) | Pin 3 SHDN active-low (same) | Pin 3 SHDN active-low (same) | Pin 3 NC / no SHDN (verify) | Pin 3 SHDN active-low (same) |
| Packaging | Tube (#PBF) | Tube / Tape and Reel | Tape and Reel (#TRPBF) | Tube (#PBF) | Tape and Reel (-R7) | Tape and Reel (-REEL7) |
Key Differentiators
- Lowest quiescent current in 5 V fixed 50 mA-class reference category (vs ADR4550BRZ-R7)
- Industry-standard pinout with integrated active-low shutdown (vs LT1461AIS8-5)
- Full -40 °C to +125 °C industrial temperature range (vs LT1461CCS8-5#PBF)
Design Notes
Place a 0.1 µF ceramic bypass capacitor within 2 mm of the VIN pin (pin 1) and a low-ESR 1 µF to 10 µF capacitor on VOUT (pin 2) to maintain stability and minimize load-transient response, as recommended in the LT1461 datasheet typical application circuit. Input supply decoupling prevents upstream switching noise from coupling into the reference output. The shutdown pin (pin 3) should be tied to VIN through a 100 kΩ resistor or left floating for normal operation; tying it directly to GND disables the reference.
Estimated: at maximum load of 50 mA from a 12 V input with 5 V output, the LT1461DHS8-5 dissipates approximately (12 V - 5 V) × 0.050 A = 0.35 W. The NSOIC-8 package has typical theta_JA of 160 °C/W on a 1-oz 2-layer board, yielding a junction temperature rise of approximately 56 °C above ambient - well within the 125 °C maximum. For higher supply voltages or sustained loads near 50 mA, increase PCB copper pour to reduce thermal resistance and maintain margin.
Route the reference output trace as a guarded differential pair when feeding an ADC reference pin, with a ground guard trace on either side to prevent digital switching noise coupling from adjacent PCB layers. Keep the VOUT trace short and avoid running it parallel to switching-converter or high-current traces. For multi-channel systems, use a star-connection topology from the LT1461DHS8-5 VOUT pin to each ADC reference input to prevent channel-to-channel reference voltage drops.
Do not omit the SHDN pin connection - leaving SHDN (pin 3) floating typically enables normal operation per the datasheet, but noisy PCB environments can couple noise into the high-impedance SHDN input causing intermittent shutdown. Tie SHDN directly to VIN through a 100 kΩ resistor for production designs. Also note that the LT1461 series includes 2.5 V, 3 V, 3.3 V, 4.5 V, 5 V, and adjustable variants - verify the exact voltage suffix before PCB assembly to prevent part-number substitution errors.
Compliance Information
RoHS and REACH compliance confirmed by #PBF suffix per Analog Devices part-numbering convention. Not AEC-Q100 qualified - consult Analog Devices automotive-grade voltage reference portfolio for AEC-Q100 qualified options.
