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Texas Instruments REF2925AIDBZRG4
- Part No.:
- REF2925AIDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
REF2925AIDBZRG4.pdf
- Description:
- IC VREF SERIES 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,242
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Product details
Overview
REF2925AIDBZRG4 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, 28 µVPP (0.1–10 Hz) noise, and 1 mV dropout at no load. It serves as a stable reference for high-resolution ADCs and portable data acquisition systems requiring low quiescent current and wide temperature operation (–40°C to 125°C).
For engineers reviewing the REF2925AIDBZRG4 datasheet, REF2925AIDBZRG4 pinout, REF2925AIDBZRG4 application, or REF2925AIDBZRG4 equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal and noise performance, and real-world implementation context for battery-powered instrumentation and industrial sensing designs.
Technical Context
The REF2925AIDBZRG4 implements a curvature-compensated band-gap topology with two bipolar transistors (Q1, Q2) biased at different current densities to generate a PTAT voltage across R1, summed with a CTAT VBE to achieve near-zero temperature coefficient. Its output remains stable without mandatory load capacitance but supports up to 25 mA sink/source capability.
It operates from VIN ≥ VOUT + 50 mV under load and down to VOUT + 1 mV unloaded, with quiescent current tightly bounded at 42–59 µA over –40°C to 125°C and supply range of 2.55 V to 5.5 V. Thermal hysteresis is specified at ≤100 ppm after cycling between –40°C and 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, 2.45–2.55 V (±2%) over full temperature and load range - ensures accurate scaling for 12–16-bit ADCs without calibration. |
| Temperature Drift | Max 100 ppm/°C (–40°C to 125°C) - limits full-range error to ±250 µV, critical for uncalibrated industrial sensors. |
| Dropout Voltage | 1 mV (unloaded), ≤50 mV at 25 mA - enables operation from ultra-low headroom supplies like single Li-ion cells. |
| Quiescent Current | 42–59 µA over temperature - sustains >1-year battery life in 10 µA sleep-cycle portable meters. |
| Output Noise | 28 µVPP (0.1–10 Hz), 80 µVRMS (10 Hz–10 kHz) - preserves ENOB in 16-bit delta-sigma converters without external filtering. |
| Load Regulation | 3–100 µV/mA (0–25 mA) - maintains reference stability during dynamic sensor excitation or DAC settling. |
| ESD Rating | ±4000 V HBM, ±1500 V CDM - meets IEC 61000-4-2 Level 3 for handheld test equipment handling. |
Pinout & Package
SOT-23 (DBZ) package: 2.92 mm × 1.30 mm body, 3-pin surface-mount, JEDEC MO-178AC compliant. Thermal resistance RθJA = 297.3°C/W; RθJB = 91.7°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply connection | Accepts 2.55–5.5 V input; minimum headroom 1 mV (no load) or 50 mV (25 mA load); bypass capacitor required at this node. |
| 2 (OUT) | Precision reference output | Delivers regulated 2.5 V; stable with any capacitive load; force/sense layout recommended for <10 µV load regulation error. |
| 3 (GND) | Analog ground reference | Must connect to clean analog ground plane; separate from digital ground to avoid noise coupling into reference path. |
Key Features
| Feature | Design Value |
|---|---|
| MicroSIZE SOT-23 package | Enables placement within 2 mm of ADC reference pins, minimizing trace inductance and noise pickup in space-constrained PCBs. |
| Low dropout (1 mV) | Permits direct use from 2.51 V rails-ideal for post-LDO or buck-boost converter outputs in portable medical devices. |
| No mandatory output capacitor | Reduces BOM count and board area; simplifies layout while maintaining stability across all load conditions and temperatures. |
| High accuracy (±2%) | Eliminates factory calibration for mid-accuracy applications such as handheld multimeters and environmental monitors. |
| Low IQ (max 59 µA) | Supports continuous operation on coin-cell batteries (e.g., CR2032) for >2 years in wake-on-event sensor nodes. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring unit logging temperature, humidity, and pressure every 10 seconds using a 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for ADC conversion and excitation of resistive bridge sensors. Use Value: Enables ±0.1% measurement accuracy over –25°C to 70°C ambient without recalibration, extending field deployment intervals. |
Use Scenario: 4–20 mA loop-powered transmitter conditioning RTD and thermocouple signals in oil & gas field instruments. IC Role / Device Role / Timing Role: Supplies precision reference for signal conditioning op-amps and ADCs operating from limited loop power budget. Use Value: Maintains 12-bit effective resolution across –40°C to 125°C junction temperature, meeting SIL-2 functional safety requirements. |
| Handheld Test Equipment | Medical Patient Monitoring |
|
Use Scenario: Portable oscilloscope front-end with dual 12-bit ADCs digitizing ±5 V analog inputs. IC Role / Device Role / Timing Role: Generates matched positive/negative references (with OPA703) for bipolar signal acquisition. Use Value: Delivers <1 LSB gain error drift over 8-hour field use, ensuring repeatable waveform amplitude measurements. |
Use Scenario: Wearable ECG module sampling biopotential signals at 1 kSPS with 14-bit resolution. IC Role / Device Role / Timing Role: Supplies low-noise 2.5 V reference for ADC and programmable gain amplifier stages. Use Value: Limits RMS noise contribution to <0.5 µV, preserving microvolt-level ST-segment detection fidelity. |
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, 12 µVPP noise, SOT-23-5 package | Higher accuracy and lower drift/noise, but requires 5-pin layout and 2.7 V min supply | Preferred for metrology-grade instruments where cost permits tighter spec compliance. |
| MAX6025AEUR+T | 2.5 V, ±0.2% initial accuracy, 75 ppm/°C drift, 20 µVPP noise, SOT-23-3 package | Same 3-pin footprint, lower drift and noise than REF2925AIDBZRG4, but 65 µA max IQ | Best drop-in upgrade when board space is fixed and sub-100 ppm/°C drift is required. |
Compared with ADR3425ARJZ-R7 and MAX6025AEUR+T, REF2925AIDBZRG4 offers the lowest quiescent current (42 µA typ) and smallest dropout (1 mV), making it optimal for ultra-low-power, battery-critical designs-even though its accuracy and noise are relaxed relative to alternatives.
Availability
REF2925AIDBZRG4 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical patient monitoring systems requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for REF2925AIDBZRG4 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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision voltage references and low-power signal chain solutions.
The REF29xx family was designed specifically for portable, battery-powered measurement systems needing high accuracy, ultra-low IQ, and minimal board space-targeting data loggers, handheld test gear, and medical diagnostics.
FAQ
What is the minimum input voltage required for stable operation of the REF2925AIDBZRG4?
The REF2925AIDBZRG4 requires a minimum input voltage of VOUT + 50 mV (i.e., 2.55 V) when delivering full 25 mA load current. In no-load conditions, it operates stably with as little as 2.501 V input-enabling compatibility with tightly regulated low-headroom power rails. This specification is validated across –40°C to 125°C per TI SBVS033C.
Does the REF2925AIDBZRG4 require an output capacitor for stability?
No, the REF2925AIDBZRG4 is internally compensated and remains stable with any capacitive load-including zero capacitance. Unlike many references, it does not mandate a minimum output capacitor, simplifying layout and reducing BOM count. However, a 0.47 µF ceramic bypass capacitor at the IN pin is required for supply noise rejection.
How does the REF2925AIDBZRG4 perform in terms of long-term stability?
The REF2925AIDBZRG4 exhibits 24 ppm drift over the first 1000 hours and 15 ppm over the subsequent 1000 hours (0–2000 hrs total), based on accelerated life testing of 30 units. This predictable aging behavior supports calibration interval planning in field-deployed instrumentation where drift must remain below 50 ppm over 5 years.
Can the REF2925AIDBZRG4 be used to generate a negative reference voltage?
Yes-the REF2925AIDBZRG4 can be combined with a low-drift op-amp like the OPA703 to create a precise ±2.5 V dual-supply reference from a ±5 V source, as shown in TI's Figure 27. The REF2925AIDBZRG4 provides the positive rail while the op-amp inverts and buffers it to generate the matched negative rail, maintaining symmetry critical for bipolar ADC front-ends.
What is the thermal hysteresis specification for the REF2925AIDBZRG4?
The REF2925AIDBZRG4 has a maximum thermal hysteresis of 100 ppm, defined as the output voltage shift after cycling from 25°C → –40°C → 125°C → 25°C. This parameter is measured per Equation 1 in TI SBVS033C and reflects reversible packaging-induced stress effects-not permanent drift-making it relevant for systems experiencing repeated thermal cycles in outdoor or automotive environments.
REF2925AIDBZRG4 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:
- Obsolete
- 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
REF2925AIDBZRG4 FAQ
1.How can I place an order for REF2925AIDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF2925AIDBZRG4 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 REF2925AIDBZRG4 reliable?
The price and inventory of REF2925AIDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF2925AIDBZRG4 is usually 5 days.
3.What payment methods are accepted for REF2925AIDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF2925AIDBZRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF2925AIDBZRG4?
REF2925AIDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF2925AIDBZRG4 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 REF2925AIDBZRG4?
For technical support, including REF2925AIDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF2925AIDBZRG4 requirements.
6.How does Aetrix verify that REF2925AIDBZRG4 is sourced from the original manufacturer or authorized distributors?
All REF2925AIDBZRG4 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 REF2925AIDBZRG4 meets industry standards.
7.What is the process for return or replacement of REF2925AIDBZRG4?
All REF2925AIDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with REF2925AIDBZRG4, 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 REF2925AIDBZRG4 part is unused and in its original packaging.
Return procedure for REF2925AIDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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