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Analog Devices Inc. LT1634ACS8-2.5#TRPBF
- Part No.:
- LT1634ACS8-2.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1634ACS8-2.5#TRPBF.pdf
- Description:
- IC VREF SHUNT 0.05% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,829
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Product details
Overview
LT1634ACS8-2.5#TRPBF 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, 10 ppm/°C max temperature drift, and 0.2 Ω typical dynamic impedance. It operates from 7 µA minimum current and supports capacitive loads without external compensation-ideal for portable meters and high-resolution ADC/DAC biasing.
For engineers reviewing the LT1634ACS8-2.5#TRPBF datasheet, LT1634ACS8-2.5#TRPBF pinout, LT1634ACS8-2.5#TRPBF application, or LT1634ACS8-2.5#TRPBF equivalent, key selection criteria include guaranteed industrial-grade stability over 0°C to 70°C, low 15 µVP-P 0.1–10 Hz noise, and SO-8 package compatibility with legacy board layouts requiring minimal redesign.
Technical Context
The LT1634ACS8-2.5#TRPBF uses trimmed thin-film resistors and an improved curvature correction technique to achieve its 0.05% initial accuracy and 10 ppm/°C max drift across the full commercial temperature range. Its bandgap-based shunt architecture functions as a two-terminal device, sinking current to regulate voltage at the cathode node.
It requires no output capacitor for stability but remains robust with up to 0.1 µF load capacitance. The device exhibits 40 ppm hysteresis after thermal cycling from 0°C to 70°C and maintains <0.4 mV reverse voltage change over 10 µA to 2 mA operating current-critical for low-drift sensor excitation and calibration circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±0.05% (±1.25 mV absolute tolerance at 25°C; enables 16-bit DAC/ADC reference without trimming) |
| Initial Accuracy | ±0.05% (guaranteed over 0°C to 70°C; eliminates need for system-level calibration in production test) |
| Tempco | 10 ppm/°C max (ensures ≤±0.25 mV drift over full commercial range; suitable for precision instrumentation) |
| Dynamic Impedance | 0.2 Ω typical (10 µA–2 mA range; minimizes load-induced voltage error in varying-current applications) |
| Low-Freq Noise | 15 µVP-P (0.1–10 Hz; preserves SNR in high-gain analog front-ends and weigh-scale amplifiers) |
| Min Operating Current | 8 µA (supports ultra-low-power battery-operated designs; compatible with microcontroller GPIO-driven bias networks) |
| Hysteresis | 40 ppm (after 0°C ↔ 70°C cycling; ensures repeatable voltage output in field-deployed equipment) |
Pinout & Package
LT1634ACS8-2.5#TRPBF is housed in an 8-lead plastic SO (S8) package with exposed pad not connected. Pin 4 is GND; Pin 5 is VOUT; Pins 1–3 and 6–8 are DNC (internally connected, no external connection). TEST pin (Pin 6) may be left floating or tied to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, 2, 3, 6, 7, 8 | DNC (Do Not Connect) | Internally connected; external routing causes parametric shift or instability |
| Pin 4 | GND | Reference return path; must be low-impedance to minimize ground bounce in mixed-signal systems |
| Pin 5 | VOUT | Cathode terminal; sinks current to maintain regulated 2.500 V; connects to load/analog ground |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 8 µA minimum current enables >10-year battery life in portable calibrators and handheld DMMs |
| No output capacitor required | Stable with 0 µF output capacitance-reduces BOM count and PCB area in space-constrained designs |
| Guaranteed 0°C to 70°C performance | Full spec compliance across commercial temperature range simplifies thermal validation for industrial control modules |
| Low 0.1–10 Hz noise | 15 µVP-P supports 20+ bit effective resolution in precision weigh scales and strain gauge interfaces |
| Robust capacitive load drive | Stable with ≥0.1 µF ceramic output cap-enables filtering of switching regulator ripple in mixed-supply systems |
Applications
| Portable Meters | Precision Regulators |
|---|---|
Use Scenario: Handheld digital multimeters requiring stable on-board reference for autoranging ADCs and LCD contrast control. IC Role / Device Role / Timing Role: Shunt reference providing 2.500 V bias for 24-bit sigma-delta ADC and internal DAC calibration. Use Value: ±0.05% accuracy eliminates factory trim steps; 10 ppm/°C drift ensures consistent measurement accuracy across ambient temperature shifts. | Use Scenario: Low-noise LDO feedback network where reference stability directly determines output regulation tightness. IC Role / Device Role / Timing Role: Precision voltage setpoint source for error amplifier reference input in adjustable linear regulators. Use Value: 0.2 Ω dynamic impedance prevents load-step-induced reference sag, maintaining ±0.01% output regulation under transient conditions. |
| A/D and D/A Converters | Calibrators |
Use Scenario: Reference for 16-bit SAR ADCs in data acquisition modules interfacing with thermocouples and RTDs. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and DAC output scaling in isolated analog I/O cards. Use Value: 15 µVP-P low-frequency noise avoids quantization uncertainty; 40 ppm hysteresis ensures repeatability during automated test sequences. | Use Scenario: Benchtop calibration sources generating traceable 2.5 V outputs for field instrument verification. IC Role / Device Role / Timing Role: Core reference element in programmable voltage standards with manual or microcontroller-controlled gain stages. Use Value: Guaranteed 0.05% initial 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-pin); requires external bypass cap; 0.075% initial accuracy; 10 ppm/°C drift | Needs dedicated supply rail; unsuitable for floating or high-side sensing topologies | Select when supply voltage ≥3.0 V is available and board layout allows 3-pin placement |
| REF192GS-2.5 | Shunt reference; 0.1% initial accuracy; 25 ppm/°C drift; SO-8; 10 µA min current | Looser accuracy and higher drift limit use in sub-14-bit systems | Choose for cost-sensitive industrial sensors where ±0.1% tolerance is acceptable |
Compared with LT1460ACS8-2.5#TRPBF and REF192GS-2.5, the LT1634ACS8-2.5#TRPBF uniquely combines shunt topology flexibility, 0.05% accuracy, and 10 ppm/°C drift in a drop-in SO-8 footprint-making it optimal for retrofitting legacy 2.5 V reference designs without layout changes.
Availability
LT1634ACS8-2.5#TRPBF is available at Aetrix Electronics and suitable for portable meters, precision regulators, and A/D and D/A converters requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LT1634ACS8-2.5#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LT1634 family.
The LT1634 series was designed specifically for micropower, high-accuracy shunt reference applications in portable instrumentation, precision data converters, and calibration equipment-emphasizing low drift, low noise, and ease of use without external compensation.
FAQ
What is the maximum operating current for LT1634ACS8-2.5#TRPBF?
The LT1634ACS8-2.5#TRPBF supports up to 50 mA forward current per Absolute Maximum Ratings. This allows use in applications requiring high sink current, such as driving multiple op-amp bias networks or powering low-dropout regulator feedback dividers. Operation above 20 mA increases self-heating and may impact long-term stability if PCB thermal design is inadequate.
Can LT1634ACS8-2.5#TRPBF replace LT1004-2.5 in existing designs?
Yes, the LT1634ACS8-2.5#TRPBF is a direct functional upgrade to the LT1004-2.5, offering superior 0.05% initial accuracy (vs. ±1%), 10 ppm/°C drift (vs. 50 ppm/°C), and lower 8 µA minimum current (vs. 45 µA). Its SO-8 pinout matches LT1004-2.5's 8-lead SO package, enabling drop-in replacement without PCB modification.
Does LT1634ACS8-2.5#TRPBF require an output capacitor for stability?
No, the LT1634ACS8-2.5#TRPBF is internally compensated and stable with 0 µF output capacitance. However, adding a 0.1 µF ceramic capacitor improves PSRR and reduces high-frequency noise coupling-particularly beneficial when powered from noisy switch-mode supplies. The device remains stable with capacitive loads up to at least 1 µF.
What is the reverse dynamic impedance specification for LT1634ACS8-2.5#TRPBF?
The LT1634ACS8-2.5#TRPBF has a typical reverse dynamic impedance of 0.2 Ω over 10 µA to 2 mA operating current. This low value ensures minimal voltage deviation (<0.4 mV) under load current variations-critical for maintaining reference integrity in multiplexed sensor systems or dynamically loaded ADC references.
Is LT1634ACS8-2.5#TRPBF RoHS compliant and lead-free?
Yes, LT1634ACS8-2.5#TRPBF carries the #TRPBF suffix indicating tape-and-reel packaging with 100% matte tin (Sn) lead finish and full RoHS compliance. It meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.
LT1634ACS8-2.5#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1634ACS8-2.5#TRPBF FAQ
1.How can I place an order for LT1634ACS8-2.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1634ACS8-2.5#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 LT1634ACS8-2.5#TRPBF reliable?
The price and inventory of LT1634ACS8-2.5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1634ACS8-2.5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1634ACS8-2.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1634ACS8-2.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1634ACS8-2.5#TRPBF?
LT1634ACS8-2.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1634ACS8-2.5#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 LT1634ACS8-2.5#TRPBF?
For technical support, including LT1634ACS8-2.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1634ACS8-2.5#TRPBF requirements.
6.How does Aetrix verify that LT1634ACS8-2.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1634ACS8-2.5#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 LT1634ACS8-2.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1634ACS8-2.5#TRPBF?
All LT1634ACS8-2.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1634ACS8-2.5#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 LT1634ACS8-2.5#TRPBF part is unused and in its original packaging.
Return procedure for LT1634ACS8-2.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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