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Texas Instruments LT1004CD-1-2
- Part No.:
- LT1004CD-1-2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1004CD-1-2.pdf
- Description:
- IC VREF SHUNT 0.32% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,018
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Product details
Overview
LT1004CD-1-2 from Texas Instruments is a two-terminal micropower band-gap voltage reference IC delivering 1.235 V nominal output with ±4 mV initial accuracy, 20 ppm/°C temperature coefficient, and 0.6 Ω reference impedance at 100 µA - used as precision reference in portable test instruments and battery-operated systems.
For engineers reviewing the LT1004CD-1-2 datasheet, LT1004CD-1-2 pinout, LT1004CD-1-2 application, or LT1004CD-1-2 equivalent, key selection criteria include low-current operation (8–20 µA min/max), ultra-low noise (60–120 µV broadband), stable 1.2 V output across 0°C to 70°C, and SOIC-8 packaging compatible with legacy LM285/LM385 designs.
Technical Context
The LT1004CD-1-2 implements a two-terminal band-gap reference architecture with internal trimming for high initial accuracy and low thermal drift. Its design integrates optimized bipolar processing and laser-trimmed resistors to achieve 20 ppm/°C average TC without external components.
It operates bidirectionally: reverse-biased as a shunt reference (IZ = 8–20 µA min to 20 mA max) or forward-biased as a low-voltage diode. Reference impedance remains ≤1.5 Ω over full temperature range, enabling stable regulation even under dynamic load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Output Voltage | 1.235 V at 100 µA - precise setpoint for ADCs, DACs, and sensor signal conditioning |
| Initial Accuracy | ±4 mV - enables 0.33% absolute voltage tolerance without calibration |
| Temp Coefficient | 20 ppm/°C - ensures ≤0.15 mV drift over 0°C to 70°C operating range |
| Reference Impedance | 0.6 Ω typical at 100 µA - minimizes load-induced output variation |
| Min Operating Current | 8 µA - supports ultra-low-power sleep modes in portable devices |
| Broadband Noise | 60–120 µV RMS (10 Hz–10 kHz) - suitable for high-resolution measurement front-ends |
| Long-Term Drift | 20 ppm/khr - guarantees stability over years of continuous operation |
Pinout & Package
LT1004CD-1-2 uses an 8-pin SOIC (D package) with two active terminals (Anode and Cathode) and six no-connect (NC) pins. Terminals 6 and 8 are internally connected to Cathode per TI package drawing D0008A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Current entry point in forward bias; connects to ground or low-side current sink in shunt configuration |
| Pin 2–5, 7 | NC | No internal connection - must be left unconnected or tied to ground per layout guidelines |
| Pin 6 & 8 | Cathode | Reference output node; connects to regulated voltage rail and feedback network |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | Operates down to 8 µA - extends battery life in handheld meters and IoT sensors |
| Low Reference Impedance | ≤1.5 Ω over full temperature range - maintains regulation during transient load steps |
| Pin-for-Pin Compatibility | Direct replacement for LM285-1.2 and LM385-1.2 - enables drop-in upgrade without PCB change |
| Stable 1.2 V Output | 1.235 V ±4 mV at 25°C - eliminates need for external trimming in factory-calibrated instruments |
| Wide Operating Range | 0°C to 70°C ambient - qualified for commercial-grade embedded control and data acquisition |
Applications
| Portable Test Instrumentation | Battery-Operated Data Loggers |
|---|---|
Use Scenario: Precision multimeter reference circuit requiring stable 1.2 V for ADC full-scale calibration. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing fixed 1.235 V reference potential. Use Value: ±4 mV initial accuracy and 20 ppm/°C TC ensure <0.02% total error over instrument operating temperature range. | Use Scenario: Low-power environmental sensor node powered by coin cell, needing long-term stable reference for analog front-end. IC Role / Device Role / Timing Role: Micropower shunt reference supplying regulated bias to op-amps and ADCs during intermittent wake cycles. Use Value: 8 µA minimum operating current enables >5-year battery life while maintaining 1.235 V accuracy within ±0.5 mV. |
| Current-Loop Transmitters | Portable Medical Monitors |
Use Scenario: 4–20 mA transmitter using voltage-to-current conversion where reference stability directly impacts loop accuracy. IC Role / Device Role / Timing Role: Precision shunt reference setting gain and offset in current-output amplifier stage. Use Value: 0.6 Ω reference impedance prevents output shift under varying loop compliance voltage, ensuring ±0.1% current accuracy. | Use Scenario: Portable ECG or pulse oximeter requiring low-noise, stable reference for analog signal chain in battery-powered enclosure. IC Role / Device Role / Timing Role: Low-noise 1.235 V reference for instrumentation amplifier and 16-bit ADC. Use Value: 60–120 µV broadband noise avoids degradation of SNR in sub-µV biomedical signal measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385B-1.2/NOPB | ±1% initial accuracy (12 mV), 100 ppm/°C TC, higher 5 Ω impedance | Lower cost but requires calibration; unsuitable for high-accuracy portable instruments | Select when budget constraints outweigh precision requirements and board space allows for trim pot |
| REF191GS | 1.25 V output, ±0.2% accuracy, 25 ppm/°C TC, 35 µA quiescent current | Three-terminal series reference - requires external bypass capacitor and higher supply headroom | Choose for improved accuracy and lower TC where system can accommodate series topology and extra pin |
Compared with LM385B-1.2/NOPB and REF191GS, the LT1004CD-1-2 delivers superior initial accuracy and lower temperature drift in a two-terminal shunt form factor, enabling simpler PCB layout and lower BOM count in space-constrained portable designs.
Availability
LT1004CD-1-2 is available at Aetrix Electronics and suitable for portable test instrumentation, battery-operated data loggers, and current-loop transmitters requiring stable component supply with guaranteed long-term availability.
Supply support for LT1004CD-1-2 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 power management solutions.
The LT1004 family was designed specifically for micropower, high-accuracy voltage reference applications in portable and battery-critical systems - emphasizing low quiescent current, tight initial tolerance, and minimal thermal drift.
FAQ
What is the nominal output voltage of the LT1004CD-1-2?
The LT1004CD-1-2 provides a nominal output voltage of 1.235 V at 100 µA reference current, with guaranteed 1.225 V to 1.245 V range over its full 0°C to 70°C operating temperature. This value is specified in the Electrical Characteristics table of the SLVS022M datasheet and reflects the trimmed band-gap reference voltage optimized for 1.2 V-class applications.
Can the LT1004CD-1-2 replace LM285-1.2 in existing designs?
Yes, the LT1004CD-1-2 is explicitly documented as a pin-for-pin replacement for the LM285 and LM385 series, with identical SOIC-8 footprint and terminal assignment (Anode on Pin 1, Cathode on Pins 6/8). It improves upon LM285-1.2 with tighter initial accuracy (±4 mV vs ±20 mV) and lower temperature coefficient (20 ppm/°C vs 100 ppm/°C), requiring no PCB changes.
What is the minimum operating current required for the LT1004CD-1-2?
The LT1004CD-1-2 requires a minimum reference current (IZ(min)) of 8 µA across its full operating temperature range (0°C to 70°C), as specified in the Electrical Characteristics table. This ultra-low threshold enables use in energy-harvesting and coin-cell-powered applications where quiescent current must remain below 10 µA.
Does the LT1004CD-1-2 require external capacitors for stability?
No, the LT1004CD-1-2 is internally compensated and does not require external capacitors for basic shunt operation. The datasheet confirms stable performance with purely resistive loads and shows no instability in typical application circuits (e.g., Figures 16–29). However, a 100 pF capacitor may be added at the cathode for enhanced high-frequency noise rejection in sensitive measurement paths.
What package type and RoHS status does the LT1004CD-1-2 use?
The LT1004CD-1-2 is supplied in an 8-pin SOIC (D package) with green RoHS-compliant finish (no Sb/Br), NIPDAU lead finish, and JEDEC Level-1 moisture sensitivity rating. It meets TI's "Green" halogen-free standard (<1000 ppm Cl/Br) and is rated for reflow up to 260°C peak temperature per the Package Option Addendum.
LT1004CD-1-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.235V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.32%
- 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
LT1004CD-1-2 FAQ
1.How can I place an order for LT1004CD-1-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1004CD-1-2 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 LT1004CD-1-2 reliable?
The price and inventory of LT1004CD-1-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1004CD-1-2 is usually 5 days.
3.What payment methods are accepted for LT1004CD-1-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1004CD-1-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1004CD-1-2?
LT1004CD-1-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1004CD-1-2 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 LT1004CD-1-2?
For technical support, including LT1004CD-1-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1004CD-1-2 requirements.
6.How does Aetrix verify that LT1004CD-1-2 is sourced from the original manufacturer or authorized distributors?
All LT1004CD-1-2 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 LT1004CD-1-2 meets industry standards.
7.What is the process for return or replacement of LT1004CD-1-2?
All LT1004CD-1-2 units undergo pre-shipment inspection (PSI). If there is an issue with LT1004CD-1-2, 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 LT1004CD-1-2 part is unused and in its original packaging.
Return procedure for LT1004CD-1-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1004CD-1-2 Tags
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TL431AIDBZR
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