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Analog Devices Inc. LT1634AIS8-2.5#TRPBF
- Part No.:
- LT1634AIS8-2.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1634AIS8-2.5#TRPBF.pdf
- Description:
- IC VREF SHUNT 0.05% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
LT1634AIS8-2.5#TRPBF from Analog Devices (acquired Linear Technology) is a micropower precision shunt voltage reference delivering 2.500 V ±0.05% initial accuracy, 10 ppm/°C max temperature coefficient, and 0.15 Ω typical dynamic impedance across –40°C to +85°C. It operates down to 8 µA minimum current and supports capacitive loads without compensation, enabling use in portable meters and high-resolution ADC/DAC references.
For engineers reviewing the LT1634AIS8-2.5#TRPBF datasheet, LT1634AIS8-2.5#TRPBF pinout, LT1634AIS8-2.5#TRPBF application, or LT1634AIS8-2.5#TRPBF equivalent, key selection criteria include industrial-temperature stability, ultra-low operating current, low noise (15 µVP-P, 0.1–10 Hz), and SO-8 package compatibility with legacy shunt reference layouts.
Technical Context
The LT1634AIS8-2.5#TRPBF uses trimmed thin-film resistors and an improved curvature correction technique to achieve its 10 ppm/°C max drift over –40°C to +85°C. Its bandgap-based shunt architecture functions as a two-terminal device, sinking current to maintain a stable 2.500 V output regardless of input voltage variations above the knee voltage.
No output capacitor is required for stability, and it remains functional with capacitive loads up to 0.1 µF. The device exhibits low hysteresis (160 ppm after –40°C to +85°C cycling) and 15 µVP-P low-frequency noise-critical for precision data acquisition systems where reference integrity directly impacts ENOB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±0.05% (±1.25 mV) at 10 µA, ensuring high absolute accuracy for calibration-grade circuits |
| Tempco | 10 ppm/°C max over –40°C to +85°C, minimizing system gain error drift in industrial environments |
| Operating Current | 8 µA min, 20 mA max - enables battery-powered operation and simplifies bias network design |
| Dynamic Impedance | 0.15 Ω typical (≤0.75 Ω max) at 10–2 mA, providing strong rejection of supply ripple and load transients |
| Low-Freq Noise | 15 µVP-P, 0.1–10 Hz - preserves resolution in 16-bit+ SAR and delta-sigma ADCs |
| Hysteresis | 160 ppm after full industrial temp cycle - limits recalibration need in field-deployed instrumentation |
| Package | 8-Lead Plastic SO (S8), RoHS-compliant, lead-free, tape-and-reel (#TRPBF) |
Pinout & Package
LT1634AIS8-2.5#TRPBF is housed in an 8-lead plastic SO (S8) package per LTC DWG #05-08-1610 Rev G. Pin 4 is GND; Pin 5 is VOUT; Pins 1–3 and 6–8 are DNC* (internally connected, no external connection). Pin 5 (VOUT) and Pin 4 (GND) form the two active terminals of this shunt reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 4 | GND | Reference ground return path; must be low-impedance and tied directly to system analog ground |
| Pin 5 | VOUT | 2.500 V shunt output node; connects to cathode of external series resistor and load reference input |
| Pins 1–3, 6–8 | DNC* | Internally connected; no external circuitry permitted - floating or tied to GND degrades performance |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 8 µA minimum operating current enables >10-year battery life in portable calibrators and handheld DMMs |
| Industrial temperature grade | Specified over –40°C to +85°C with 10 ppm/°C max drift - suitable for uncontrolled environmental deployments |
| No output capacitor required | Stable with 0 µF output capacitance, reducing BOM count and PCB area in space-constrained designs |
| Low dynamic impedance | ≤0.75 Ω ensures <1 µV/mA load regulation error - critical for multiplexed reference distribution |
| Low hysteresis | 160 ppm post-cycling allows single-point calibration in field instruments without thermal re-trimming |
Applications
| Portable Meters | Precision Regulators |
|---|---|
Use Scenario: Handheld digital multimeters requiring stable 2.5 V reference for 5½-digit ADC front-end scaling. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise full-scale input range for integrating ADCs. Use Value: 0.05% initial accuracy and 10 ppm/°C drift ensure measurement repeatability across ambient temperature shifts without recalibration. | Use Scenario: Low-noise LDO feedback divider where reference stability defines output voltage tolerance. IC Role / Device Role / Timing Role: Precision shunt reference replacing Zener diodes in adjustable regulator feedback networks. Use Value: 15 µVP-P noise and 0.15 Ω dynamic impedance suppress output voltage ripple and improve PSRR by >20 dB vs. discrete Zeners. |
| A/D and D/A Converters | Calibrators |
Use Scenario: 16-bit SAR ADC in industrial sensor signal conditioning with ratiometric or external reference mode. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and DAC output scaling. Use Value: Ultra-low 8 µA operating current minimizes self-heating error; 160 ppm hysteresis prevents offset drift during thermal cycling in automated test equipment. | Use Scenario: Benchtop calibration source generating traceable 2.5 V outputs for instrument verification. IC Role / Device Role / Timing Role: Primary reference element in programmable voltage standards with manual or microcontroller-controlled trim. Use Value: Guaranteed 0.05% accuracy and 10 ppm/°C drift meet ANSI/NCSL Z540 calibration uncertainty requirements for Class II standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1460ACS8-2.5#TRPBF | Series reference (3-terminal), requires ≥2.7 V supply; 0.075% initial accuracy, 10 ppm/°C drift | Needs dedicated supply rail; unsuitable for floating or high-side sensing topologies | Select when supply headroom permits and low quiescent current (3.7 µA) is prioritized over shunt flexibility |
| REF5025AIDR | Series reference (3-terminal), 2.5 V, 0.05% accuracy, 3 ppm/°C drift, 950 µA quiescent current | Higher power, fixed supply requirement; superior drift but incompatible with shunt-based bias networks | Choose for ultra-low-drift lab-grade systems where supply current is not constrained and layout allows 3-terminal placement |
Compared with LT1460ACS8-2.5#TRPBF and REF5025AIDR, the LT1634AIS8-2.5#TRPBF offers unique two-terminal shunt operation, enabling direct replacement of Zener diodes in existing designs, while maintaining industrial-temp accuracy and sub-10 µA operation - a trade-off of slightly higher drift than REF5025AIDR for vastly lower power and topology flexibility.
Availability
LT1634AIS8-2.5#TRPBF is available at Aetrix Electronics and suitable for portable meters, precision regulators, and A/D and D/A converters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1634AIS8-2.5#TRPBF 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. (ADI) acquired Linear Technology in 2017 and maintains its high-precision analog portfolio, including voltage references, amplifiers, and power management ICs.
The LT1634 family was designed by Linear Technology specifically for micropower, high-accuracy shunt reference applications in portable and industrial instrumentation where low drift, low noise, and minimal operating current are essential.
FAQ
What is the minimum operating current for LT1634AIS8-2.5#TRPBF?
The LT1634AIS8-2.5#TRPBF specifies a minimum operating current of 8 µA across its full industrial temperature range (–40°C to +85°C). This value is guaranteed in the Electrical Characteristics table under "Minimum Operating Current" for the A-grade, S8 package variant. Operation below 8 µA may result in degraded accuracy or instability.
Does LT1634AIS8-2.5#TRPBF require an output capacitor?
No, the LT1634AIS8-2.5#TRPBF does not require an output capacitor for stability and is explicitly characterized as stable with 0 µF output capacitance. However, a 0.1 µF ceramic capacitor may be added to further reduce high-frequency noise in sensitive measurement circuits - the device remains stable under that condition.
What is the pin configuration for LT1634AIS8-2.5#TRPBF?
The LT1634AIS8-2.5#TRPBF uses an 8-lead SO (S8) package. Pin 4 is GND; Pin 5 is VOUT. Pins 1–3 and 6–8 are DNC* (internally connected, no external connection). Pin 5 serves as the 2.500 V reference output terminal, and Pin 4 provides the return path - all other pins must remain unconnected.
How does LT1634AIS8-2.5#TRPBF compare to LM385-2.5 in industrial applications?
The LT1634AIS8-2.5#TRPBF improves upon the LM385-2.5 with 0.05% initial accuracy (vs. 1–2%), 10 ppm/°C max drift (vs. 50–100 ppm/°C), 8 µA min current (vs. 10–20 µA), and guaranteed industrial temperature operation. It also features lower dynamic impedance (0.15 Ω vs. ~5 Ω) and 15 µVP-P noise (vs. ~60 µVP-P), making it suitable for modern high-resolution data acquisition where LM385-2.5 falls short.
Is LT1634AIS8-2.5#TRPBF RoHS-compliant and lead-free?
Yes, the LT1634AIS8-2.5#TRPBF is RoHS-compliant and features a lead-free finish, as indicated by the "#TRPBF" suffix in the part number. It meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for standard reflow soldering profiles per Analog Devices' packaging specifications.
LT1634AIS8-2.5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 50 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 15µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 8 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1634AIS8-2.5#TRPBF FAQ
1.How can I place an order for LT1634AIS8-2.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1634AIS8-2.5#TRPBF 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 LT1634AIS8-2.5#TRPBF reliable?
The price and inventory of LT1634AIS8-2.5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1634AIS8-2.5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1634AIS8-2.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1634AIS8-2.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1634AIS8-2.5#TRPBF?
LT1634AIS8-2.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1634AIS8-2.5#TRPBF 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 LT1634AIS8-2.5#TRPBF?
For technical support, including LT1634AIS8-2.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1634AIS8-2.5#TRPBF requirements.
6.How does Aetrix verify that LT1634AIS8-2.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1634AIS8-2.5#TRPBF 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 LT1634AIS8-2.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1634AIS8-2.5#TRPBF?
All LT1634AIS8-2.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1634AIS8-2.5#TRPBF, 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 LT1634AIS8-2.5#TRPBF part is unused and in its original packaging.
Return procedure for LT1634AIS8-2.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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