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Analog Devices Inc. LT1634BCS8-1.25#PBF
- Part No.:
- LT1634BCS8-1.25#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1634BCS8-1.25#PBF.pdf
- Description:
- IC VREF SHUNT 0.05% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,180
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Product details
Overview
LT1634BCS8-1.25#PBF from Analog Devices (formerly Linear Technology) is a micropower, precision shunt voltage reference delivering 1.25V nominal output with ±0.225% initial accuracy (±2.81mV), 25ppm/°C max temperature coefficient, and 0.125Ω typical dynamic impedance. It operates from 7µA minimum current and supports capacitive loads without external compensation, making it ideal for low-power portable meters and high-resolution ADC/DAC biasing.
For engineers reviewing the LT1634BCS8-1.25#PBF datasheet, LT1634BCS8-1.25#PBF pinout, LT1634BCS8-1.25#PBF application, or LT1634BCS8-1.25#PBF equivalent, key selection criteria include its SO-8 package, commercial-grade (0°C to 70°C) temperature range, guaranteed 25ppm/°C drift, 10µA typical operating current, and compatibility with unregulated supplies in space-constrained instrumentation designs.
Technical Context
The LT1634BCS8-1.25#PBF uses trimmed thin-film resistors and an improved curvature correction technique to achieve tight initial accuracy and low drift. Its bandgap-based shunt architecture functions as a two-terminal device requiring only an external current source and load, eliminating need for output capacitors while maintaining stability with up to 0.1µF capacitance.
It exhibits 10µA typical operating current, 0.125Ω typical dynamic impedance at 10µA–2mA, and 10µVP-P low-frequency noise (0.1Hz–10Hz). Hysteresis is limited to 40ppm over 0°C to 70°C cycling, supporting repeatable calibration in field-deployed equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.250V ±0.225% (±2.81mV) at IR = 10µA - ensures stable reference for 12-bit+ converters without trimming |
| Initial Accuracy | ±0.225% - enables single-point calibration in portable test equipment |
| Temp Coefficient | 25ppm/°C max - limits full-range error to ±1.75mV across 0°C to 70°C |
| Operating Current | 7µA min, 10µA typ - supports battery-powered systems with multi-year runtime |
| Dynamic Impedance | 0.125Ω typ (10µA–2mA) - minimizes load-induced voltage shift in varying-current circuits |
| Low-Freq Noise | 10µVP-P (0.1Hz–10Hz) - preserves SNR in precision sensor front-ends and weigh-scale amplifiers |
| Hysteresis | 40ppm over 0°C to 70°C cycle - guarantees repeatability in recalibration workflows |
Pinout & Package
LT1634BCS8-1.25#PBF is housed in an 8-lead plastic SO (Small Outline) package (S8), 0.150-inch body width, with standard JEDEC MS-012AC footprint. Pin 4 is GND; pins 1–3 and 6–8 are DNC* (internally connected, no external connection); pin 5 is VOUT; pin 7 is TEST (may be left open or tied to GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, 2, 3, 6, 8 | DNC* | Internally connected; must remain unconnected to avoid parametric shift or damage |
| Pin 4 | GND | Reference ground return path; requires low-impedance PCB connection to minimize noise coupling |
| Pin 5 | VOUT | 1.25V reference output node; connects to load or feedback network of regulator/ADC |
| Pin 7 | TEST | Factory test terminal; may be left floating or tied to GND - no functional role in operation |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 10µA typical current draw enables >10-year battery life in handheld calibrators |
| Stable with capacitive loads | No output capacitor required - simplifies layout and reduces BOM count in space-limited PCBs |
| Low dynamic impedance | 0.125Ω typical ensures <100µV shift under 100µA load transients - critical for ratiometric sensor bridges |
| Guaranteed temp drift | 25ppm/°C max over 0°C to 70°C eliminates need for software compensation in industrial controllers |
| Low hysteresis | 40ppm over commercial temperature cycle ensures consistent readings after thermal cycling in field instruments |
Applications
| Portable Meters | Precision Regulators |
|---|---|
Use Scenario: Handheld multimeters and clamp meters powered by AA/AAA batteries requiring stable 1.25V reference for 16-bit sigma-delta ADCs. IC Role / Device Role / Timing Role: Shunt reference providing precise, low-drift bias for ADC internal reference buffer and analog front-end gain stages. Use Value: Enables ±0.01% measurement accuracy over 0–40°C ambient without recalibration, extending time between factory service intervals. | Use Scenario: Low-noise LDOs and adjustable linear regulators in medical infusion pumps where output stability directly impacts dosage accuracy. IC Role / Device Role / Timing Role: Precision voltage setpoint generator for feedback loop of op-amp-controlled pass transistor. Use Value: Maintains ±0.02% output regulation over line/load/temperature - critical for compliance with IEC 60601-1 safety margins. |
| A/D and D/A Converters | Calibrators |
Use Scenario: Reference for 12-bit SAR ADCs in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Ratiometric reference for ADC conversion, referenced against system supply rail via resistor divider. Use Value: Delivers 10µVP-P noise floor and 25ppm/°C drift - enabling 12-bit ENOB across full industrial temperature range. | Use Scenario: Benchtop calibration standards used to verify thermocouple simulators and RTD transmitters. IC Role / Device Role / Timing Role: Primary voltage standard in self-contained calibration head, traceable to NIST via factory characterization. Use Value: ±0.225% initial accuracy and 40ppm hysteresis support 0.05% calibration uncertainty budgets per ISO/IEC 17025. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1634ACS8-1.25#PBF | 0.05% initial accuracy (vs. 0.225%), 10ppm/°C max drift (vs. 25ppm/°C) | Required for metrology-grade lab equipment; not cost-justified for portable field tools | Select when absolute accuracy <±0.625mV and drift <±0.7mV over temperature are mandatory |
| TLV431ACDBVR | 1.24V nominal, ±0.5% initial accuracy, 100ppm/°C max drift, SOT-23-3 package | Larger drift and lower accuracy limit use to non-critical biasing; smaller footprint suits ultra-compact designs | Choose for cost-sensitive consumer electronics where ±6.2mV error is acceptable and board area is constrained |
Compared with LT1634ACS8-1.25#PBF, the LT1634BCS8-1.25#PBF trades 4.5× less accuracy for lower cost and broader availability; versus TLV431ACDBVR, it delivers 4× lower drift and 2× better accuracy in same SO-8 footprint, justifying premium for industrial instrumentation.
Availability
LT1634BCS8-1.25#PBF is available at Aetrix Electronics and suitable for portable meters, precision regulators, and A/D and D/A converters requiring stable component supply with guaranteed long-term continuity.
Supply support for LT1634BCS8-1.25#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT1634 family was designed specifically for micropower, high-accuracy shunt references in battery-operated and space-constrained instrumentation - emphasizing low drift, minimal hysteresis, and robust capacitive-load stability.
FAQ
What is the maximum operating current for LT1634BCS8-1.25#PBF?
The LT1634BCS8-1.25#PBF has an absolute maximum forward current rating of 20mA and a maximum reverse current rating of 100mA for the 1.25V version. Continuous operation above 20mA is not recommended, as it exceeds the specified safe operating area and may degrade long-term stability or cause thermal overstress in the SO-8 package.
Can LT1634BCS8-1.25#PBF drive a 0.1µF capacitive load?
Yes, the LT1634BCS8-1.25#PBF is stable with capacitive loads up to 0.1µF, as confirmed in the datasheet's response time plots (G08/G09). Unlike many shunt references, it does not require an output compensation capacitor - this simplifies design and improves reliability in high-EMI environments like motor drives or PLC backplanes.
Is LT1634BCS8-1.25#PBF pin-compatible with LT1634ACS8-1.25#PBF?
Yes, LT1634BCS8-1.25#PBF and LT1634ACS8-1.25#PBF share identical SO-8 (S8) package pinout, footprint, and terminal configuration - both use pins 1–3/6–8 as DNC*, pin 4 as GND, pin 5 as VOUT, and pin 7 as TEST. They are mechanically and electrically interchangeable on PCBs, differing only in grade-spec accuracy and drift.
What is the reverse breakdown voltage tolerance for LT1634BCS8-1.25#PBF at 10µA?
At IR = 10µA, the reverse breakdown voltage of LT1634BCS8-1.25#PBF is specified as 1.24718V (min) to 1.25281V (max), corresponding to ±0.225% of 1.250V. This tolerance is guaranteed over the full 0°C to 70°C commercial temperature range and defines the absolute voltage window within which the device regulates.
Does LT1634BCS8-1.25#PBF require a heatsink in normal operation?
No, LT1634BCS8-1.25#PBF does not require a heatsink. With a typical operating current of 10µA and maximum power dissipation below 1.25mW (at 100mA, far beyond normal use), junction temperature rise is negligible in the SO-8 package (θJA = 190°C/W). Even at 20mA continuous current, power dissipation remains under 25mW - well within safe thermal limits.
LT1634BCS8-1.25#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 100 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- 10µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 7 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1634BCS8-1.25#PBF FAQ
1.How can I place an order for LT1634BCS8-1.25#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1634BCS8-1.25#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT1634BCS8-1.25#PBF reliable?
The price and inventory of LT1634BCS8-1.25#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1634BCS8-1.25#PBF is usually 5 days.
3.What payment methods are accepted for LT1634BCS8-1.25#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1634BCS8-1.25#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1634BCS8-1.25#PBF?
LT1634BCS8-1.25#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1634BCS8-1.25#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT1634BCS8-1.25#PBF?
For technical support, including LT1634BCS8-1.25#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1634BCS8-1.25#PBF requirements.
6.How does Aetrix verify that LT1634BCS8-1.25#PBF is sourced from the original manufacturer or authorized distributors?
All LT1634BCS8-1.25#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1634BCS8-1.25#PBF meets industry standards.
7.What is the process for return or replacement of LT1634BCS8-1.25#PBF?
All LT1634BCS8-1.25#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1634BCS8-1.25#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT1634BCS8-1.25#PBF part is unused and in its original packaging.
Return procedure for LT1634BCS8-1.25#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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