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Analog Devices Inc. LT1634ACS8-5#TRPBF
- Part No.:
- LT1634ACS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1634ACS8-5#TRPBF.pdf
- Description:
- IC VREF SHUNT 0.05% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,780
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Product details
Overview
LT1634ACS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower precision shunt voltage reference delivering a stable 5.000V output with ±0.05% initial accuracy, 10ppm/°C max temperature drift, and 0.15Ω typical dynamic impedance. It operates from 15µA minimum current and supports capacitive loads without external compensation, making it ideal for high-resolution A/D converters and portable metering systems.
For engineers reviewing the LT1634ACS8-5#TRPBF datasheet, LT1634ACS8-5#TRPBF pinout, LT1634ACS8-5#TRPBF application, or LT1634ACS8-5#TRPBF equivalent, key selection criteria include guaranteed 0.05% initial tolerance over 0°C to 70°C, low 35µVP-P 0.1Hz–10Hz noise at 20µA, and SO-8 package compatibility with standard PCB layouts for precision analog signal chains.
Technical Context
The LT1634ACS8-5#TRPBF uses trimmed thin-film resistors and an improved curvature correction technique to achieve its 10ppm/°C max drift specification across the full commercial temperature range. Its bandgap-based shunt architecture functions as a two-terminal device, requiring only an external current source and load-no series pass transistor or feedback loop.
It exhibits less than 1Ω dynamic impedance up to 2mA reverse current and maintains stability with capacitive loads up to 0.1µF, eliminating need for output compensation capacitors in most applications. Hysteresis is limited to 40ppm over 0°C to 70°C thermal cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V ±0.05% (±2.5mV) at 20µA, ensuring direct compatibility with 12-bit DACs and 16-bit ADCs requiring 5V reference rails |
| Initial Accuracy | ±0.05% (Grade A), verified at 25°C and 20µA, enabling single-point calibration in production test |
| Temp Coefficient | 10ppm/°C max over 0°C to 70°C, supporting stable performance in unregulated industrial enclosures |
| Operating Current | 15µA min, 30mA max, allowing use in battery-powered systems with >10-year shelf life |
| Dynamic Impedance | 0.15Ω typical (0.75Ω max) at 20µA–2mA, minimizing load-induced voltage shift in multiplexed reference designs |
| Low-Freq Noise | 35µVP-P (0.1Hz–10Hz), critical for high-dynamic-range sensor front-ends and precision weigh scales |
| Hysteresis | 40ppm over 0°C to 70°C cycling, reducing recalibration needs in field-deployed instrumentation |
Pinout & Package
LT1634ACS8-5#TRPBF is housed in an 8-lead plastic SO (S8) package per LTC DWG #05-08-1610 Rev G, with 1.27mm pitch, 3.988mm width, and 4.801–5.004mm length. Pin 1 is marked by bevel edge or dimple; pins 1–4 and 5–8 are on opposite sides. Pins 1–3 and 6–7 are DNC (internally connected, no external connection); Pin 4 is GND; Pin 5 is NC (not connected internally); Pin 8 is VOUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | DNC* | Internally connected - must remain unconnected to avoid parasitic coupling or latch-up |
| Pin 2 | DNC* | Internally connected - no external circuitry permitted |
| Pin 3 | DNC* | Internally connected - floating connection prohibited |
| Pin 4 | GND | Reference ground return path; must be tied directly to system analog ground plane |
| Pin 5 | NC*** | No internal connection - may be left open or grounded for mechanical stability |
| Pin 6 | DNC* | Internally connected - not usable as signal or power terminal |
| Pin 7 | DNC* | Internally connected - no routing or vias allowed |
| Pin 8 | VOUT | 5.000V reference output node; requires local 0.1µF ceramic decoupling when driving >100pF loads |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 15µA minimum operating current enables >5-year battery life in handheld calibrators |
| Stable capacitive loading | No output compensation capacitor required up to 0.1µF, simplifying layout in space-constrained modules |
| Guaranteed temp drift | 10ppm/°C max over 0°C to 70°C eliminates need for software temperature compensation in factory automation |
| Low dynamic impedance | 0.15Ω typical ensures <0.15mV shift under 1mA load transients in multi-channel data acquisition |
| Low hysteresis | 40ppm over 0°C–70°C thermal cycle reduces post-storage calibration drift in field service equipment |
Applications
| Portable Meters | Precision Regulators |
|---|---|
Use Scenario: Handheld multimeters and clamp meters requiring stable 5V reference for 16-bit sigma-delta ADCs and LCD bias generation. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing precise 5.000V rail independent of supply variation or battery discharge. Use Value: Enables ±0.05% measurement accuracy over full temperature range without recalibration during field use. | Use Scenario: Low-noise linear regulators for FPGA I/O banks where reference stability dictates digital timing margin. IC Role / Device Role / Timing Role: Reference element in adjustable LDO feedback network, setting output voltage with sub-mV error. Use Value: 35µVP-P low-frequency noise prevents jitter in clock distribution networks powered from regulated rails. |
| A/D and D/A Converters | Calibrators |
Use Scenario: Reference for 12-bit dual DAC (e.g., LTC1448) in programmable current sources used in process control loops. IC Role / Device Role / Timing Role: Primary voltage reference supplying both DAC core and internal charge pump supply rails. Use Value: 0.05% initial accuracy and 10ppm/°C drift ensure ≤0.5 LSB total error over temperature in closed-loop calibration systems. | Use Scenario: Benchtop calibration standards verifying thermocouple simulators and RTD transmitters. IC Role / Device Role / Timing Role: Stable 5.000V source for ratiometric excitation of precision resistor networks in traceable voltage dividers. Use Value: 40ppm hysteresis and 10ppm/°C drift meet ANSI/NCSL Z540-1 requirements for metrology-grade references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1460ACS8-5#TRPBF | Series reference (3-pin), requires input voltage ≥5.4V; higher 1.2µA quiescent current; same 0.05% accuracy and 10ppm/°C drift | Not suitable for low-input-voltage or high-impedance current-source topologies; requires external bypass cap | Select when input supply is well-regulated and board space allows 3-pin footprint |
| REF5050AIDR | Series reference (3-pin), 5.000V, 0.05% accuracy, 3ppm/°C drift, 95µA quiescent current, SO-8 package | Superior drift but higher power; incompatible with shunt-based current-source configurations | Choose for ultra-stable lab equipment where 3ppm/°C outweighs 6× higher current draw |
Compared with LT1634ACS8-5#TRPBF, LT1460ACS8-5#TRPBF demands higher headroom and draws 80× more current, while REF5050AIDR offers lower drift but cannot replace LT1634ACS8-5#TRPBF in shunt-configured circuits due to fundamental topology mismatch.
Availability
LT1634ACS8-5#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 0.05% initial accuracy and commercial-temperature-grade reliability.
Supply support for LT1634ACS8-5#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, manufacturing, and documentation for the LT® family of precision analog ICs.
The LT1634 product line was designed specifically for micropower, high-accuracy shunt voltage reference applications in portable instrumentation, industrial sensors, and calibration equipment where low drift and minimal operating current are mandatory.
FAQ
What is the minimum operating current for LT1634ACS8-5#TRPBF?
The LT1634ACS8-5#TRPBF requires a minimum operating current of 15µA to maintain regulation within specifications. Below this threshold, output voltage deviates beyond the ±0.05% initial accuracy band. This value is confirmed in the 5V Electrical Characteristics table under "Minimum Operating Current" for the ACS8 grade at 20µA test condition.
Does LT1634ACS8-5#TRPBF require an output capacitor?
No, the LT1634ACS8-5#TRPBF does not require an output compensation capacitor and remains stable with capacitive loads up to 0.1µF. However, a local 0.1µF ceramic capacitor is recommended at the VOUT pin when driving >100pF loads to suppress high-frequency noise and improve transient response, as noted in Typical Application TA03 and TA04 schematics.
What is the temperature coefficient specification for LT1634ACS8-5#TRPBF?
The LT1634ACS8-5#TRPBF has a maximum temperature coefficient of 10ppm/°C over the 0°C to 70°C commercial temperature range. This value is guaranteed for Grade A devices (denoted by 'A' in part number) and applies to the full operating range, not just at 25°C, as specified in the "Temperature Coefficient (Note 8)" row of the 5V Electrical Characteristics table.
Can LT1634ACS8-5#TRPBF be used in place of LM385-5.0?
Yes, the LT1634ACS8-5#TRPBF can serve as a high-performance upgrade to the LM385-5.0, offering superior specs: 0.05% vs. 1% initial accuracy, 10ppm/°C vs. 50ppm/°C drift, and 15µA vs. 20µA min operating current. However, pinout differs - LM385-5.0 is TO-92 (3-pin), while LT1634ACS8-5#TRPBF is SO-8 (8-pin) - requiring PCB redesign.
What is the dynamic impedance of LT1634ACS8-5#TRPBF at 20µA?
At 20µA reverse current, the LT1634ACS8-5#TRPBF exhibits a typical reverse dynamic impedance of 0.15Ω, with a maximum of 0.75Ω over the full 0°C to 70°C range. This low impedance minimizes output voltage shift under varying load currents and is verified in the "Reverse Dynamic Impedance (Note 5)" section of the 5V Electrical Characteristics table.
LT1634ACS8-5#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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 30 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 35µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 15 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1634ACS8-5#TRPBF FAQ
1.How can I place an order for LT1634ACS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1634ACS8-5#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 LT1634ACS8-5#TRPBF reliable?
The price and inventory of LT1634ACS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1634ACS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1634ACS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1634ACS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1634ACS8-5#TRPBF?
LT1634ACS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1634ACS8-5#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 LT1634ACS8-5#TRPBF?
For technical support, including LT1634ACS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1634ACS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1634ACS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1634ACS8-5#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 LT1634ACS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1634ACS8-5#TRPBF?
All LT1634ACS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1634ACS8-5#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 LT1634ACS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1634ACS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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