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Texas Instruments LT1004MDR-1-2
- Part No.:
- LT1004MDR-1-2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1004MDR-1-2.pdf
- Description:
- VOLTAGE REFERENCE
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
LT1004MDR-1-2 from Texas Instruments is a micropower two-terminal 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. It operates from 8 µA to 20 mA and serves as a precision reference in portable test instruments and battery-operated systems.
For engineers reviewing the LT1004MDR-1-2 datasheet, LT1004MDR-1-2 pinout, LT1004MDR-1-2 application, or LT1004MDR-1-2 equivalent, key selection criteria include low-quiescent-current operation (≤15 µA typical), stable 1.235 V output across −40°C to 85°C, minimal load regulation error (≤10 mV from 1–20 mA), and compatibility with LM285/LM385-based designs requiring improved accuracy and lower drift.
Technical Context
The LT1004MDR-1-2 implements a band-gap reference architecture with internal trimming for high initial accuracy and low thermal drift. Its two-terminal configuration simplifies integration into current-loop and low-power biasing circuits without external resistors or supply rails.
It features very low dynamic impedance (0.6 Ω typ. at 100 µA) and broadband noise of 60–120 µV RMS (10 Hz–10 kHz), enabling stable performance in high-resolution ADC references and precision current sources where supply rejection and long-term stability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Output Voltage | 1.235 V - precise, temperature-stable reference point for analog signal conditioning and calibration. |
| Initial Accuracy | ±4 mV - ensures ≤0.33% absolute error at 25°C without external trimming. |
| Temp Coefficient | 20 ppm/°C - limits output drift to ≤2.5 mV over −40°C to 85°C operating range. |
| Reference Impedance | 0.6 Ω @ 100 µA - maintains tight regulation under varying load currents up to 20 mA. |
| Min Operating Current | 8 µA - enables use in ultra-low-power applications such as coin-cell-powered sensors. |
| Noise (10 Hz–10 kHz) | 60–120 µV RMS - supports high-resolution data acquisition without added filtering overhead. |
| Long-Term Drift | 20 ppm/khr - guarantees predictable aging behavior in mission-critical instrumentation. |
Pinout & Package
LT1004MDR-1-2 is housed in an 8-pin SOIC (D) package with two active terminals: Anode (Pin 4) and Cathode (Pin 5). Pins 6 and 8 are internally connected to Cathode; all other pins (1, 2, 3, 7) are no-connect (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 4) | Reference current input | Sinks current from external bias network; defines operating point for band-gap core. |
| Cathode (Pins 5, 6, 8) | Reference voltage output | Provides stable 1.235 V output; multiple cathode pins reduce trace resistance and improve thermal symmetry. |
| Pins 1, 2, 3, 7 | No internal connection | Unused; must remain unconnected or grounded only if required by PCB layout constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Two-terminal operation | Eliminates need for separate supply rail or ground return path-ideal for floating current-loop transmitters. |
| Micropower current range | Operates down to 8 µA quiescent current, enabling >10-year battery life in remote sensor nodes. |
| Pin-for-pin replacement | Direct drop-in upgrade for LM285-1.2 and LM385-1.2 with tighter initial tolerance and lower tempco. |
| Low-output impedance | 0.6 Ω typical impedance minimizes load-induced voltage shift in precision DAC buffers and op-amp feedback networks. |
| Stable over industrial temp | Specified from −40°C to 85°C (I-grade), supporting deployment in automotive cabin modules and industrial field transmitters. |
Applications
| Portable Test Instruments | Battery-Operated Systems |
|---|---|
Use Scenario: Handheld multimeter reference stage requiring stable 1.235 V for ADC full-scale calibration. IC Role / Device Role / Timing Role: Two-terminal voltage reference providing ratiometric accuracy independent of battery voltage decay. Use Value: Enables ±0.1% measurement accuracy over 0–100% battery discharge without recalibration. | Use Scenario: Low-power gas sensor node powered by CR2032 coin cell with 10-year target lifetime. IC Role / Device Role / Timing Role: Micropower reference for analog front-end biasing and ADC reference in ultra-low-duty-cycle sampling. Use Value: Draws only 8 µA minimum, extending usable battery life beyond 12 years at 1-sample-per-minute duty cycle. |
| Current-Loop Instrumentation | Portable Meter Reference |
Use Scenario: 4–20 mA transmitter in process control loop where loop power is derived from 24 V supply. IC Role / Device Role / Timing Role: Precision shunt reference establishing accurate current setpoint via op-amp feedback. Use Value: Delivers 0.01% current accuracy over temperature with <10 mV load regulation error from 4–20 mA. | Use Scenario: Digital panel meter with LED display and analog input scaling circuitry. IC Role / Device Role / Timing Role: Stable reference for scaling input signals to match 0–10 V or 4–20 mA display ranges. Use Value: Maintains display linearity within ±0.02% FS across ambient temperatures from −10°C to 60°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BIMX-1.2 | ±1% initial accuracy (12 mV), 100 ppm/°C tempco, higher 10 Ω impedance. | Lower-cost option for non-critical applications where 0.3% error is acceptable. | Select when budget constraints outweigh precision requirements and long-term stability is secondary. |
| REF3012AIDBZR | ±0.2% initial accuracy (2.4 mV), 50 ppm/°C tempco, 3.5 µA min current, SOT-23-3 package. | Three-terminal design requires external ground connection; not pin-compatible. | Choose for higher accuracy and smaller footprint where board space is constrained and three-terminal topology is acceptable. |
Compared with LM385BIMX-1.2, LT1004MDR-1-2 delivers 3× better initial accuracy and 5× lower tempco, enabling direct replacement in upgraded instrumentation. Versus REF3012AIDBZR, it offers true two-terminal simplicity but trades off some accuracy and package size for legacy compatibility and zero-ground-layout flexibility.
Availability
LT1004MDR-1-2 is available at Aetrix Electronics and suitable for portable test instruments, battery-operated systems, and current-loop instrumentation requiring stable component supply and guaranteed long-term availability.
Supply support for LT1004MDR-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 industrial-grade components.
The LT1004 series was designed specifically for micropower, high-accuracy voltage referencing in portable and battery-constrained systems-emphasizing low drift, minimal quiescent current, and robustness across extended temperature ranges.
FAQ
What is the operating temperature range for LT1004MDR-1-2?
The LT1004MDR-1-2 is rated for operation from −40°C to 85°C, matching the industrial-grade LT1004I specification. This range is validated per the official Texas Instruments datasheet SLVS022M and applies across all electrical parameters including initial accuracy, temperature coefficient, and reference impedance.
Is LT1004MDR-1-2 pin-compatible with LM285-1.2?
Yes, LT1004MDR-1-2 is explicitly specified as a pin-for-pin replacement for the LM285 and LM385 series. Its SOIC-8 package uses identical pinout: Anode on Pin 4 and Cathode on Pin 5, with Pins 6 and 8 internally tied to Cathode-enabling direct board-level substitution without layout changes.
What is the minimum current required for LT1004MDR-1-2 to regulate properly?
The LT1004MDR-1-2 requires a minimum reference current of 8 µA to maintain regulation, as confirmed in the "electrical characteristics" table of the SLVS022M datasheet. Below this threshold, output voltage deviates from nominal 1.235 V; operation at 10 µA or higher is recommended for full-spec performance.
Does LT1004MDR-1-2 require external capacitors for stability?
No, LT1004MDR-1-2 is internally compensated and does not require external capacitors for basic DC regulation. However, a 100 nF ceramic capacitor placed close to the cathode pin is recommended in noisy environments to suppress high-frequency ripple and improve transient response during load steps.
How does LT1004MDR-1-2 achieve its low temperature coefficient?
LT1004MDR-1-2 achieves 20 ppm/°C average temperature coefficient through proprietary band-gap core design, laser-trimmed resistor ratios, and matched transistor geometry that cancels first-order thermal effects. This is verified across the full −40°C to 85°C range in the SLVS022M datasheet's "Reference voltage vs Free-air temperature" plots (Figures 4 and 11).
LT1004MDR-1-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Bulk
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LT1004MDR-1-2 FAQ
1.How can I place an order for LT1004MDR-1-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1004MDR-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 LT1004MDR-1-2 reliable?
The price and inventory of LT1004MDR-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 LT1004MDR-1-2 is usually 5 days.
3.What payment methods are accepted for LT1004MDR-1-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1004MDR-1-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1004MDR-1-2?
LT1004MDR-1-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1004MDR-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 LT1004MDR-1-2?
For technical support, including LT1004MDR-1-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1004MDR-1-2 requirements.
6.How does Aetrix verify that LT1004MDR-1-2 is sourced from the original manufacturer or authorized distributors?
All LT1004MDR-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 LT1004MDR-1-2 meets industry standards.
7.What is the process for return or replacement of LT1004MDR-1-2?
All LT1004MDR-1-2 units undergo pre-shipment inspection (PSI). If there is an issue with LT1004MDR-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 LT1004MDR-1-2 part is unused and in its original packaging.
Return procedure for LT1004MDR-1-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1004MDR-1-2 Tags
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