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Texas Instruments REF1004C-1.2/2K5
- Part No.:
- REF1004C-1.2/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF1004C-1.2/2K5.pdf
- Description:
- IC VREF SHUNT 0.3% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,393
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Product details
Overview
REF1004C-1.2/2K5 from Texas Instruments is a two-terminal micropower bandgap voltage reference diode delivering 1.235 V nominal output with ±4 mV initial accuracy, 20 ppm/°C temperature coefficient, and operation down to 10 µA supply current. It is housed in an 8-lead SOIC package and targets precision low-power systems including portable medical instrumentation and battery-powered test equipment.
For engineers reviewing the REF1004C-1.2/2K5 datasheet, REF1004C-1.2/2K5 pinout, REF1004C-1.2/2K5 application, or REF1004C-1.2/2K5 equivalent, key selection criteria include initial voltage tolerance, long-term stability (20 ppm/kHr), dynamic impedance (0.6 Ω), noise performance (120 µV RMS), and compatibility with micropower A/D converter biasing.
Technical Context
The REF1004C-1.2/2K5 operates as a shunt-mode reference requiring external current-setting resistor and load regulation via reverse-biased junction behavior. Its bandgap core achieves stable 1.235 V output across 0°C to +70°C with minimal thermal drift and low dynamic impedance for high PSRR in noisy supply environments.
It supports 10 µA to 20 mA operating current range, exhibits 60–120 µV RMS wideband noise (10 Hz–10 kHz), and maintains <1.5 mV output change over full current range - enabling use in high-resolution data acquisition where reference stability directly impacts ADC effective resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal at 100 µA; ensures precise bias point for 12-bit+ ADCs and DACs |
| Initial Accuracy | ±4 mV (±0.32%); enables calibration-free operation in portable instrumentation |
| Tempco | 20 ppm/°C max; limits drift to <1.5 mV over 0°C to 70°C ambient range |
| Min Operating Current | 10 µA; allows direct use with high-impedance sources like photodiode amplifiers |
| Dynamic Impedance | 0.6 Ω max at 100 µA; suppresses supply ripple coupling into reference node |
| Output Noise | 120 µV RMS (10 Hz–10 kHz); preserves SNR in low-noise signal chains |
| Long-Term Stability | 20 ppm/kHr; guarantees <0.25% drift over 10 years in uncalibrated systems |
Pinout & Package
Package: 8-Lead SOIC (D), RoHS-compliant, MSL Level-3, 260°C peak reflow, tape-and-reel packaging (2500 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Current sink terminal; connects to system ground or low-side current source |
| 2,3,6,7 | NC | No internal connection; must remain unconnected or grounded per layout best practice |
| 4 | Cathode | Reference output node; delivers regulated 1.235 V when reverse-biased |
| 5,8 | Cathode | Redundant output terminals; paralleled internally to reduce bond-wire inductance |
Key Features
| Feature | Design Value |
|---|---|
| Two-terminal shunt architecture | Eliminates need for dedicated reference input pin; simplifies PCB routing in space-constrained layouts |
| Micropower operation | 10 µA minimum current enables >1-year battery life in coin-cell–powered devices |
| Low dynamic impedance | 0.6 Ω ensures <10 µV output perturbation from 1 mA supply transients |
| High long-term stability | 20 ppm/kHr reduces recalibration frequency in field-deployed medical sensors |
| Low wideband noise | 120 µV RMS supports 16-bit effective resolution in precision data loggers |
Applications
| Battery-Powered Test Equipment | Portable Medical Instrumentation |
|---|---|
Use Scenario: Handheld multimeter requiring stable reference for autoranging DC voltage measurement. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation for ADC front-end and scaling resistor network. Use Value: ±4 mV initial accuracy and 20 ppm/°C tempco ensure <0.1% measurement error across operating temperature without factory calibration. | Use Scenario: Portable ECG monitor powered by single AA cell with analog front-end gain control. IC Role / Device Role / Timing Role: Precision bias source for op-amp common-mode level setting and ADC reference. Use Value: 10 µA min operating current extends battery life beyond 500 hours while maintaining 12-bit linearity. |
| Portable Communications Devices | A/D and D/A Converters |
Use Scenario: Low-power IoT sensor node transmitting analog sensor data via BLE radio. IC Role / Device Role / Timing Role: Reference for SAR ADC digitizing temperature/humidity signals before RF transmission. Use Value: 120 µV RMS noise prevents degradation of ENOB below 13.5 bits in 16-bit conversion pipeline. | Use Scenario: Industrial DAQ module using 24-bit sigma-delta ADC with programmable gain amplifier. IC Role / Device Role / Timing Role: Primary reference for both ADC and DAC sections in dual-conversion architecture. Use Value: 20 ppm/kHr long-term stability avoids drift-induced offset correction every 6 months in unattended deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1004CD-1.2 | Same 1.2 V nominal, ±5 mV initial accuracy, higher 30 ppm/°C tempco, 25 µA min current | Lacks REF1004C-1.2/2K5's 20 ppm/kHr long-term stability and lower noise (150 µV RMS) | Acceptable where cost sensitivity outweighs stability requirements; not recommended for medical-grade calibration intervals |
| LM385B-1.2/NOPB | 1.235 V nominal, ±10 mV initial accuracy, 50 ppm/°C tempco, 10 µA min current | Higher initial error and drift limit use to non-critical consumer applications; no specified long-term stability data | Suitable only for cost-driven designs accepting >0.8% total error budget; requires tighter layout controls due to higher impedance |
Compared with LT1004CD-1.2 and LM385B-1.2/NOPB, REF1004C-1.2/2K5 delivers superior long-term stability and lower noise - critical for field-deployed instrumentation where recalibration is impractical and signal integrity is paramount.
Availability
REF1004C-1.2/2K5 is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered test equipment, and A/D and D/A converters requiring stable component supply with guaranteed traceability and lifecycle continuity.
Supply support for REF1004C-1.2/2K5 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and personal electronics reach.
The REF1004 series was designed as a micropower shunt reference family targeting ultra-low-current, high-stability applications in portable and battery-operated systems - replacing legacy references like LM185/385 with improved accuracy and long-term reliability.
FAQ
What is the nominal output voltage and initial accuracy of the REF1004C-1.2/2K5?
The REF1004C-1.2/2K5 provides a nominal output voltage of 1.235 V at 100 µA operating current, with an initial accuracy of ±4 mV (±0.32%) over the 0°C to +70°C temperature range. This specification is verified per the TI datasheet SBVS002 and applies to all units marked "REF 0412" in the 8-lead SOIC package. The REF1004C-1.2/2K5 maintains this accuracy without trimming or external calibration.
Can the REF1004C-1.2/2K5 operate from a 1.5 V battery source?
Yes, the REF1004C-1.2/2K5 can operate from a 1.5 V battery when configured as a shunt reference with appropriate current-limiting resistance - Figure 3 in the TI datasheet shows a working circuit delivering 1.235 V output from a 1.5 V alkaline cell. The REF1004C-1.2/2K5 requires only 10 µA minimum current and exhibits low dropout behavior, making it uniquely suited for single-cell applications where headroom is constrained.
What is the maximum operating current and dynamic impedance of the REF1004C-1.2/2K5?
The REF1004C-1.2/2K5 supports operating currents up to 20 mA and specifies a maximum dynamic impedance of 0.6 Ω at 100 µA (TA = +25°C). This low impedance ensures minimal output voltage variation under transient load conditions - critical for maintaining ADC reference integrity during sampling bursts. The REF1004C-1.2/2K5 sustains this performance across its full rated temperature range.
How does the long-term stability of the REF1004C-1.2/2K5 compare to standard shunt references?
The REF1004C-1.2/2K5 offers 20 ppm/kHr long-term stability at 25°C, significantly better than typical shunt references such as LM385B-1.2/NOPB (no published long-term spec) or LT1004CD-1.2 (30 ppm/kHr). This metric means the REF1004C-1.2/2K5 drifts less than 0.25% over 10 years of continuous operation - a key advantage for sealed medical or remote sensor applications where field recalibration is impossible.
Is the REF1004C-1.2/2K5 pin-compatible with the LT1004 or LM185 series?
The REF1004C-1.2/2K5 is a drop-in replacement for the LT1004 and an upgraded alternative to the LM185/385 series in 8-lead SOIC packages, sharing identical pinout (Anode on Pin 1, Cathode on Pins 4/5/8, NC on Pins 2/3/6/7). However, it is not pin-compatible with TO-92 or SOT-23 variants of those families. The REF1004C-1.2/2K5 retains full functional compatibility while improving accuracy, stability, and noise performance over both predecessors.
REF1004C-1.2/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.235V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.3%
- Temperature Coefficient:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 60µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 10 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
REF1004C-1.2/2K5 FAQ
1.How can I place an order for REF1004C-1.2/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF1004C-1.2/2K5 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 REF1004C-1.2/2K5 reliable?
The price and inventory of REF1004C-1.2/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF1004C-1.2/2K5 is usually 5 days.
3.What payment methods are accepted for REF1004C-1.2/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF1004C-1.2/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF1004C-1.2/2K5?
REF1004C-1.2/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF1004C-1.2/2K5 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 REF1004C-1.2/2K5?
For technical support, including REF1004C-1.2/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF1004C-1.2/2K5 requirements.
6.How does Aetrix verify that REF1004C-1.2/2K5 is sourced from the original manufacturer or authorized distributors?
All REF1004C-1.2/2K5 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 REF1004C-1.2/2K5 meets industry standards.
7.What is the process for return or replacement of REF1004C-1.2/2K5?
All REF1004C-1.2/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with REF1004C-1.2/2K5, 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 REF1004C-1.2/2K5 part is unused and in its original packaging.
Return procedure for REF1004C-1.2/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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