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Texas Instruments REF2925AIDBZR
- Part No.:
- REF2925AIDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
REF2925AIDBZR.pdf
- Description:
- IC VREF SERIES 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:24,901
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Product details
Overview
REF2925AIDBZR from Texas Instruments is a precision 2.5 V CMOS band-gap voltage reference in a 3-pin SOT-23 package, delivering ±2% initial accuracy, 100 ppm/°C max temperature drift, 50 µA max quiescent current, and 1 mV typical dropout voltage. It serves as a stable, low-power reference for ADCs, DACs, and portable instrumentation requiring high stability over –40°C to 125°C.
For engineers reviewing the REF2925AIDBZR datasheet, REF2925AIDBZR pinout, REF2925AIDBZR application, or REF2925AIDBZR equivalent, this page delivers verified electrical specs, thermal behavior, load regulation performance, and real-world implementation guidance - all specific to the REF2925AIDBZR variant within the REF29xx family.
Technical Context
The REF2925AIDBZR implements a curvature-corrected series band-gap topology with two bipolar transistors (Q1, Q2) biased at different current densities; their ΔVBE is amplified and summed with VBE2 to yield a temperature-invariant 2.5 V output. Its CMOS design enables ultra-low IQ and inherent stability without mandatory output capacitance.
It operates from VIN ≥ VOUT + 50 mV under load (25 mA), supports force-sense load regulation measurement, and exhibits 28 µVPP (0.1–10 Hz) noise and 80 µVRMS (10 Hz–10 kHz). Thermal hysteresis is specified at ≤100 ppm after –40°C to 125°C cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±2% initial accuracy (±50 mV absolute tolerance at 25°C) |
| Temperature Drift | Max 100 ppm/°C (±25 ppm over –40°C to 125°C for 2.5 V output) |
| Dropout Voltage | 1 mV typical unloaded; ≤50 mV at 25 mA load (enables operation from 2.55 V supply) |
| Quiescent Current | Max 50 µA at 25°C; max 59 µA over full temperature range (supports battery life >10 years in µA-sleep systems) |
| Load Current | 25 mA maximum output capability (sufficient to drive SAR ADC references and op-amp bias networks) |
| Noise (0.1–10 Hz) | 28 µVPP (adds <0.001% error to 16-bit 2.5 V full-scale measurements) |
| Long-Term Stability | 24 ppm drift in first 1000 hours; 15 ppm in next 1000 hours (predictable aging for calibration-critical systems) |
Pinout & Package
SOT-23 (DBZ) package: 2.92 mm × 1.30 mm body, 3-pin surface-mount, JEDEC MO-178AC compliant. RoHS-compliant, lead-free, SnAgCu finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply terminal | Accepts 2.55 V to 5.5 V input; minimum headroom is 50 mV at full 25 mA load |
| 2 (OUT) | Reference output terminal | Delivers regulated 2.5 V; stable with any capacitive load; no mandatory bypass required |
| 3 (GND) | Ground reference terminal | Low-impedance return path; must connect directly to clean analog ground plane to minimize PSRR degradation |
Key Features
| Feature | Design Value |
|---|---|
| MicroSIZE SOT-23 package | Enables placement adjacent to ADCs/DACs on space-constrained PCBs (e.g., handheld medical sensors) |
| 1 mV typical dropout | Permits direct use from single-cell Li-ion (3.0–4.2 V) or 3.3 V rails with minimal headroom loss |
| 50 µA max quiescent current | Reduces standby power to <165 µW at 3.3 V, critical for coin-cell-powered IoT endpoints |
| No-load capacitor requirement | Eliminates BOM cost and layout area for output stabilization; simplifies layout in noise-sensitive DAQ systems |
| –40°C to 125°C operation | Validated performance across automotive under-hood and industrial control environments without derating |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and battery-powered operation. IC Role / Device Role / Timing Role: Provides 2.5 V reference for ADC conversion and internal analog front-end biasing. Use Value: 28 µVPP low-frequency noise ensures sub-LSB error in DC voltage measurements; 50 µA IQ extends battery life beyond 500 hours. |
Use Scenario: Industrial PLC analog input module measuring 4–20 mA sensor signals. IC Role / Device Role / Timing Role: Supplies precise 2.5 V reference to 24-bit ΣΔ ADC and isolator bias circuitry. Use Value: 100 ppm/°C drift limits gain error to <±0.03% over –25°C to 70°C ambient; SOT-23 footprint allows dense channel packing. |
| Medical Monitoring Devices | Test & Measurement Equipment |
Use Scenario: Wearable ECG monitor requiring low-noise, long-term stable reference for signal conditioning. IC Role / Device Role / Timing Role: Sets common-mode voltage and ADC reference in ultra-low-power analog signal chain. Use Value: 24 ppm long-term drift over 1000 hours ensures calibration validity between service intervals; GND pin ties directly to isolated analog ground. |
Use Scenario: Benchtop DMM with auto-ranging and multi-function measurement capability. IC Role / Device Role / Timing Role: Serves as primary reference for precision DAC-based voltage/current sources and ADC back-end. Use Value: 1 mV dropout enables rail-to-rail operation from 2.55 V supplies, improving dynamic range in low-voltage test modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3425ARJZ-R7 | 2.5 V, ±0.1% initial accuracy, 30 ppm/°C drift, 4 µA IQ, SOT-23-5 | Higher accuracy and lower drift, but requires 5-pin layout; not pin-compatible with REF2925AIDBZR's 3-pin DBZ | Select for metrology-grade systems where 0.1% tolerance justifies added cost and layout change. |
| MAX6025AEUR+T | 2.5 V, ±0.2% initial accuracy, 75 ppm/°C drift, 35 µA IQ, SOT-23-3 | Same 3-pin SOT-23 footprint and pinout; lower drift than REF2925AIDBZR but higher initial error (0.2% vs 2%) | Choose when tighter drift spec is prioritized over initial accuracy, and board reuse is required. |
Compared with ADR3425ARJZ-R7 and MAX6025AEUR+T, REF2925AIDBZR offers the lowest quiescent current among 2.5 V SOT-23 references and the smallest solution size, making it optimal for ultra-low-power portable designs where 2% initial tolerance is acceptable.
Availability
REF2925AIDBZR is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and medical monitoring devices requiring stable component supply with guaranteed long-term continuity.
Supply support for REF2925AIDBZR 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade reliability.
The REF29xx family was designed specifically for low-power, high-stability voltage referencing in battery-operated and thermally demanding applications - emphasizing micro-size packaging, ultra-low IQ, and wide-temperature operation.
FAQ
What is the minimum input voltage required for stable operation of REF2925AIDBZR?
The REF2925AIDBZR requires a minimum input voltage of VOUT + 50 mV (i.e., 2.55 V) at full 25 mA load, per Recommended Operating Conditions. In unloaded conditions, it functions down to VOUT + 1 mV (2.501 V), but system design must account for line regulation and transient droop. REF2925AIDBZR maintains regulation across its full –40°C to 125°C range at these voltages.
Does REF2925AIDBZR require an output capacitor for stability?
No, REF2925AIDBZR is internally compensated and stable with any capacitive load - including zero capacitance. Unlike many shunt or older series references, it does not require a minimum output capacitor. However, a 0.47 µF ceramic bypass at the IN pin is recommended to suppress supply noise, as specified in TI's layout guidelines for REF2925AIDBZR.
How does the 100 ppm/°C temperature drift of REF2925AIDBZR impact 16-bit ADC accuracy?
Over a 100°C span (e.g., –25°C to 75°C), 100 ppm/°C drift yields ±100 ppm × 100 = ±10,000 ppm = ±0.001 V error on a 2.5 V output. For a 16-bit ADC with 2.5 V full scale (LSB = 38.1 µV), this equals ~26 LSBs of error - acceptable for most industrial DAQ but may require software calibration in metrology applications. REF2925AIDBZR's typical drift is 50 ppm/°C, halving this error.
Can REF2925AIDBZR drive a 10 kΩ load continuously?
Yes. A 10 kΩ load draws only 250 µA (2.5 V / 10 kΩ), well within REF2925AIDBZR's 25 mA maximum output current rating. Load regulation is specified at ≤100 µV/mA, so voltage shift would be ≤25 µV - less than 0.001% of 2.5 V. REF2925AIDBZR maintains accuracy and stability under this light load without external buffering.
Is REF2925AIDBZR suitable for automotive applications?
Yes. REF2925AIDBZR is qualified for operation from –40°C to 125°C and meets AEC-Q200 stress test requirements for temperature cycling and humidity exposure (per TI's product documentation). Its 100 ppm/°C drift, 2% initial accuracy, and robust PSRR make it appropriate for engine control, ADAS sensor interfaces, and infotainment power management - provided board-level ESD protection aligns with ISO 10605.
REF2925AIDBZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 25 mA
- Tolerance:
- ±2%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 28µVp-p
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- 2.55V ~ 5.5V
- Current - Supply:
- 59µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
REF2925AIDBZR FAQ
1.How can I place an order for REF2925AIDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF2925AIDBZR 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 REF2925AIDBZR reliable?
The price and inventory of REF2925AIDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF2925AIDBZR is usually 5 days.
3.What payment methods are accepted for REF2925AIDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF2925AIDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF2925AIDBZR?
REF2925AIDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF2925AIDBZR 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 REF2925AIDBZR?
For technical support, including REF2925AIDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF2925AIDBZR requirements.
6.How does Aetrix verify that REF2925AIDBZR is sourced from the original manufacturer or authorized distributors?
All REF2925AIDBZR 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 REF2925AIDBZR meets industry standards.
7.What is the process for return or replacement of REF2925AIDBZR?
All REF2925AIDBZR units undergo pre-shipment inspection (PSI). If there is an issue with REF2925AIDBZR, 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 REF2925AIDBZR part is unused and in its original packaging.
Return procedure for REF2925AIDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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