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Analog Devices Inc. LT1634BIS8-2.5
- Part No.:
- LT1634BIS8-2.5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1634BIS8-2.5.pdf
- Description:
- IC VREF SHUNT 0.05% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,543
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Product details
Overview
LT1634BIS8-2.5 from Analog Devices (formerly Linear Technology) is a micropower precision shunt voltage reference delivering a stable 2.500 V output with ±0.05% initial accuracy, 25 ppm/°C max temperature coefficient, and 0.20 Ω typical dynamic impedance across –40°C to +85°C. It operates down to 8 µA and supports precision A/D converters, portable meters, and industrial calibrators.
For engineers reviewing the LT1634BIS8-2.5 datasheet, LT1634BIS8-2.5 pinout, LT1634BIS8-2.5 application, or LT1634BIS8-2.5 equivalent, key selection criteria include guaranteed industrial-temperature performance, low-drift operation without output compensation capacitors, and compatibility with unregulated supplies in space-constrained SO-8 layouts.
Technical Context
The LT1634BIS8-2.5 uses trimmed thin-film resistors for 0.05% initial voltage accuracy and an improved curvature correction technique to achieve ≤25 ppm/°C temperature drift over –40°C to +85°C. Its bandgap-based shunt architecture functions as a two-terminal device requiring only an external current source.
It exhibits <0.20 Ω dynamic impedance at 10–20 µA operating current, delivers 15 µVP-P low-frequency noise (0.1 Hz–10 Hz), and maintains stability with capacitive loads-no output capacitor required for basic operation, though 0.1 µF improves transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±0.05% (2.49094 V to 2.50906 V at IR = 10 µA, –40°C to +85°C) |
| Initial Accuracy | ±0.05% - enables single-point calibration in high-resolution data acquisition systems |
| Temp Coefficient | ≤25 ppm/°C - ensures <±0.5 mV drift over full industrial temperature range |
| Operating Current | 8 µA min - supports ultra-low-power battery-operated instruments |
| Dynamic Impedance | 0.20 Ω typ (10 µA–2 mA) - minimizes load-induced output variation |
| Low-Freq Noise | 15 µVP-P (0.1 Hz–10 Hz) - critical for 16-bit+ ADC reference stability |
| Hysteresis | 160 ppm (∆T = –40°C to +85°C) - quantifies thermal cycling-induced voltage shift |
Pinout & Package
LT1634BIS8-2.5 is housed in an 8-lead plastic SO (S8) package per LTC DWG #05-08-1610 Rev G, with 1.27 mm pitch, 3.988 mm width, and JEDEC-standard footprint. Pin 4 is GND; Pin 5 is VOUT; Pins 1–3 and 6–8 are DNC (do not connect), with internal connection or no bond wire.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, 2, 3, 6, 7, 8 | DNC* | Internally connected or unconnected - must remain floating; no external circuitry allowed |
| Pin 4 | GND | Reference ground node - requires low-impedance return path for accuracy |
| Pin 5 | VOUT | 2.500 V shunt reference output - connects to cathode of external current source |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 8 µA minimum operating current enables multi-year battery life in handheld calibrators |
| Industrial temp grade | Specified over –40°C to +85°C - suitable for outdoor instrumentation and factory-floor sensors |
| No output capacitor needed | Stable with zero output capacitance - simplifies layout and reduces BOM count |
| Low dynamic impedance | 0.20 Ω typical - rejects ripple and load transients better than Zener diodes or older references |
| Low hysteresis | 160 ppm after full thermal cycle - preserves calibration integrity across seasonal storage |
Applications
| Portable Meters | Precision Regulators |
|---|---|
Use Scenario: Handheld multimeters and clamp meters requiring stable on-board reference during battery discharge. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and scaling for 24-bit sigma-delta ADCs. Use Value: 0.05% initial accuracy and 25 ppm/°C drift maintain 0.1% measurement fidelity across ambient temperature swings and aging. | Use Scenario: Low-noise linear regulators for FPGA I/O banks or analog sensor signal chains. IC Role / Device Role / Timing Role: Precision feedback reference for adjustable LDOs using op-amp error amplifiers. Use Value: 15 µVP-P low-frequency noise prevents reference-induced quantization errors in sensitive analog outputs. |
| A/D Converters | Calibrators |
Use Scenario: High-resolution data loggers sampling thermocouples or strain gauges at 1 kSPS. IC Role / Device Role / Timing Role: Primary reference for SAR and delta-sigma ADCs requiring <1 LSB error at 16+ bits. Use Value: 0.20 Ω dynamic impedance ensures <0.5 µV load-induced error even with fast digital switching currents. | Use Scenario: Benchtop calibration standards used to verify DMMs and process controllers. IC Role / Device Role / Timing Role: Stable 2.500 V traceable reference node in automated test equipment (ATE) fixtures. Use Value: 160 ppm hysteresis and <±0.5 mV total drift support NIST-traceable calibration intervals up to 12 months. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1460BCS8-2.5 | Series reference (3-pin), requires input voltage ≥3.0 V; 0.075% initial accuracy; 10 ppm/°C max drift | Needs regulated supply rail; unsuitable for direct shunt replacement in current-source topologies | Select when system has clean ≥3.0 V supply and lower drift is prioritized over micropower operation |
| REF3025AIDBZR | Series reference (3-pin); 0.2% initial accuracy; 50 ppm/°C max drift; 50 µA quiescent current | Higher power, wider tolerance - appropriate for cost-sensitive industrial controls but not metrology-grade tools | Choose for high-volume production where ±0.2% accuracy suffices and PCB layout allows series topology |
Compared with LT1634BIS8-2.5, LT1460BCS8-2.5 offers tighter drift but demands higher headroom and cannot replace it directly in shunt configurations; REF3025AIDBZR trades accuracy and power efficiency for lower cost and broader availability in consumer-grade designs.
Availability
LT1634BIS8-2.5 is available at Aetrix Electronics and suitable for portable meters, precision regulators, and A/D converters requiring stable component supply under industrial temperature conditions and long-term calibration integrity.
Supply support for LT1634BIS8-2.5 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 acquired Linear Technology in 2017 and maintains its precision analog portfolio, including voltage references, op amps, and power management ICs for high-reliability applications.
The LT1634 family was designed specifically for micropower, high-accuracy shunt reference use cases in portable test equipment, industrial sensors, and calibration infrastructure - emphasizing low drift, minimal hysteresis, and robustness across thermal cycling.
FAQ
What is the minimum operating current for LT1634BIS8-2.5?
The LT1634BIS8-2.5 requires a minimum operating current of 8 µA to maintain regulation and specified accuracy across its full industrial temperature range (–40°C to +85°C). Below this threshold, output voltage may deviate beyond the ±0.05% initial tolerance. This ultra-low requirement makes LT1634BIS8-2.5 ideal for battery-powered devices where current budget is constrained, such as handheld calibrators and remote sensor nodes.
Does LT1634BIS8-2.5 require an output capacitor?
No, the LT1634BIS8-2.5 does not require an output capacitor for basic DC regulation stability. Its internal design ensures stability with zero output capacitance. However, adding a 0.1 µF ceramic capacitor at the VOUT pin improves transient response during rapid load changes - a recommended practice in A/D converter reference applications where switching noise could couple into the reference node. The LT1634BIS8-2.5 remains stable with larger capacitive loads.
What is the temperature coefficient specification for LT1634BIS8-2.5?
The LT1634BIS8-2.5 has a maximum temperature coefficient of 25 ppm/°C over the full industrial temperature range (–40°C to +85°C), calculated per Note 8 in the datasheet as (VMAX – VMIN) / (TMAX – TMIN). This translates to a worst-case output drift of ±0.5 mV across the entire range - significantly tighter than standard Zener references and sufficient for 16-bit system accuracy without software compensation.
Can LT1634BIS8-2.5 be used as a direct replacement for LM385-2.5?
The LT1634BIS8-2.5 can functionally replace the LM385-2.5 in most shunt reference circuits but is not pin-compatible due to differing pinouts: LM385-2.5 uses TO-92 (3-pin) or SO-8 with different terminal assignments, while LT1634BIS8-2.5 uses SO-8 with only Pin 4 (GND) and Pin 5 (VOUT) active. Layout modification is required. Additionally, LT1634BIS8-2.5 offers superior specs: 0.05% vs. 0.8% initial accuracy, 25 ppm/°C vs. 100 ppm/°C drift, and 8 µA vs. 20 µA minimum current.
What is the reverse dynamic impedance of LT1634BIS8-2.5 at 10 µA?
At 10 µA operating current, the LT1634BIS8-2.5 exhibits a typical reverse dynamic impedance of 0.20 Ω, with a maximum of 0.75 Ω over the full industrial temperature range. This low value ensures minimal output voltage perturbation when load current varies - critical in precision ratiometric measurements where reference stability directly impacts measurement linearity and repeatability. The impedance remains stable up to 2 mA, supporting moderate current-sink applications.
LT1634BIS8-2.5 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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 50 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 25ppm/°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
LT1634BIS8-2.5 FAQ
1.How can I place an order for LT1634BIS8-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1634BIS8-2.5 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 LT1634BIS8-2.5 reliable?
The price and inventory of LT1634BIS8-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1634BIS8-2.5 is usually 5 days.
3.What payment methods are accepted for LT1634BIS8-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1634BIS8-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1634BIS8-2.5?
LT1634BIS8-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1634BIS8-2.5 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 LT1634BIS8-2.5?
For technical support, including LT1634BIS8-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1634BIS8-2.5 requirements.
6.How does Aetrix verify that LT1634BIS8-2.5 is sourced from the original manufacturer or authorized distributors?
All LT1634BIS8-2.5 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 LT1634BIS8-2.5 meets industry standards.
7.What is the process for return or replacement of LT1634BIS8-2.5?
All LT1634BIS8-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LT1634BIS8-2.5, 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 LT1634BIS8-2.5 part is unused and in its original packaging.
Return procedure for LT1634BIS8-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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