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Texas Instruments LT1004IDG4-2-5
- Part No.:
- LT1004IDG4-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1004IDG4-2-5.pdf
- Description:
- IC VREF SHUNT 0.8% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:259
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Product details
Overview
LT1004IDG4-2-5 from Texas Instruments is a two-terminal micropower band-gap voltage reference IC delivering 2.5 V nominal output with ±20 mV initial accuracy, 20 ppm/°C temperature coefficient, and 0.2–0.6 Ω reference impedance at 100 µA. It operates from 8 µA to 20 mA and supports industrial temperature range (−40°C to 85°C), serving as a precision reference in battery-powered instrumentation and current-loop transmitters.
For engineers reviewing the LT1004IDG4-2-5 datasheet, LT1004IDG4-2-5 pinout, LT1004IDG4-2-5 application, or LT1004IDG4-2-5 equivalent, this page provides verified specifications, SOIC-8 package terminal mapping, real-world use cases in portable test equipment and low-power sensor interfaces, and validated alternative parts for design continuity.
Technical Context
The LT1004IDG4-2-5 implements a two-terminal zener-like topology with internal band-gap compensation, enabling stable 2.5 V reference generation without external biasing components. Its architecture minimizes thermal drift via matched transistor pairs and trimmed resistive networks, achieving 20 ppm/°C typical TC over −40°C to 85°C.
It functions as a shunt reference: cathode connects to system ground, anode to regulated node through a current-setting resistor. Reference impedance remains below 1.5 Ω across full temperature range and operating current (8–20 mA), ensuring minimal load-induced voltage error in precision analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V nominal; ±20 mV initial tolerance ensures ≤0.8% absolute error at 25°C without trimming. |
| Temp Coefficient | 20 ppm/°C max; guarantees ≤±2 mV drift over −40°C to 85°C ambient, critical for unheated field instruments. |
| Ref Impedance | 0.2–0.6 Ω at 100 µA; enables <10 µV error per 1 mA load variation-essential for high-resolution ADC references. |
| Operating Current | 8 µA min to 20 mA max; supports ultra-low-power sleep modes and high-current buffer drive simultaneously. |
| Noise (10 Hz–10 kHz) | 60–120 µV broadband; low enough to avoid degrading 16-bit SAR ADC performance without external filtering. |
| Long-Term Drift | 20 ppm/khr; predicts <0.2% voltage shift over 10 years, suitable for sealed industrial sensors. |
Pinout & Package
LT1004IDG4-2-5 is housed in an 8-pin SOIC (D) package with 1.27 mm lead pitch and 1.75 mm max height. Pins 6 and 8 are internally connected cathodes; pins 1, 3, 4, and 7 are no-connect terminals. Only pins 2 (anode) and 5 (cathode) are functional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 2 | Anode | Connects to regulated node via current-limiting resistor; carries reverse bias current into device. |
| Pin 5 | Cathode | Ground reference point; all voltage measurements referenced to this pin; internally tied to pins 6 and 8. |
| Pins 1,3,4,7 | No internal connection | Electrically isolated; must remain unconnected on PCB to prevent parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | Operates down to 8 µA quiescent current-enables multi-year battery life in portable meters. |
| Low reference impedance | Sub-1 Ω impedance stabilizes output under dynamic load changes in data acquisition systems. |
| Industrial temp range | Rated for −40°C to 85°C operation-validates performance in outdoor environmental monitors and automotive under-hood modules. |
| Pin-compatible upgrade | Direct replacement for LM385-2.5 with improved accuracy and lower TC-reduces BOM count in legacy designs. |
Applications
| Portable Test Instrumentation | Battery-Operated Sensor Nodes |
|---|---|
Use Scenario: Handheld multimeter requiring stable 2.5 V reference for 16-bit ADC scaling across 0–10 V input range. IC Role / Device Role / Timing Role: Shunt voltage reference providing primary scaling reference for analog-to-digital conversion. Use Value: ±20 mV initial accuracy and 20 ppm/°C TC ensure measurement repeatability within ±0.02% over full operating temperature without calibration. | Use Scenario: Wireless temperature transmitter powered by AA batteries, transmitting data every 10 seconds. IC Role / Device Role / Timing Role: Precision reference for RTD bridge excitation and ADC reference in ultra-low-power signal chain. Use Value: 8 µA minimum operating current extends battery life beyond 5 years while maintaining 0.1°C temperature resolution. |
| Current-Loop Transmitters | Portable Meter Reference |
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART modulation capability. IC Role / Device Role / Timing Role: Stable 2.5 V reference for DAC output scaling and loop current regulation circuitry. Use Value: Low 0.6 Ω reference impedance prevents gain error during HART AC signal injection onto DC loop current. | Use Scenario: Clamp-on ammeter with integrated display and auto-ranging functionality. IC Role / Device Role / Timing Role: Primary voltage reference for microcontroller's internal ADC and display driver biasing. Use Value: SOIC-8 package allows compact layout; 20 ppm/°C TC eliminates need for temperature compensation firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BIMX-2.5 | ±30 mV initial accuracy, 50 ppm/°C TC, 2.5 V nominal, SOIC-8, −40°C to 85°C | Higher drift and wider tolerance reduce accuracy in high-resolution measurement paths | Select when cost sensitivity outweighs 0.5% absolute accuracy requirement |
| REF3025AIDBZR | ±12 mV initial accuracy, 50 ppm/°C TC, 2.5 V nominal, SOT-23-3, −40°C to 125°C | Three-terminal architecture requires external bias; smaller footprint but higher layout complexity | Select for space-constrained designs where 3-pin interface and extended temp range justify redesign |
Compared with LM385BIMX-2.5, LT1004IDG4-2-5 delivers tighter initial tolerance and lower TC for improved system-level accuracy; compared with REF3025AIDBZR, it offers simpler two-terminal integration at the expense of slightly relaxed long-term stability and no extended 125°C rating.
Availability
LT1004IDG4-2-5 is available at Aetrix Electronics and suitable for portable test instrumentation, battery-operated sensor nodes, and current-loop transmitters requiring stable component supply across industrial temperature ranges and multi-year production cycles.
Supply support for LT1004IDG4-2-5 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 over 90 years of innovation in precision analog ICs.
The LT1004 family was designed specifically for micropower, two-terminal voltage reference applications in portable and battery-critical systems-prioritizing ultra-low operating current, tight initial accuracy, and robust temperature stability without external components.
FAQ
What is the operating current range for LT1004IDG4-2-5?
The LT1004IDG4-2-5 operates from a minimum reference current of 8 µA up to 20 mA. This wide range supports both ultra-low-power sleep states (e.g., 10 µA in battery-backed sensors) and high-current drive scenarios (e.g., feeding op-amp buffers in data loggers). The device maintains specified accuracy across this entire range, with reference impedance remaining below 1.5 Ω even at 20 mA.
Is LT1004IDG4-2-5 pin-compatible with LM385 series devices?
Yes, LT1004IDG4-2-5 is a pin-for-pin replacement for the LM385-2.5 in SOIC-8 packages. Both share identical pin 2 (anode) and pin 5 (cathode) assignments, with pins 1, 3, 4, and 7 as no-connect. LT1004IDG4-2-5 improves upon LM385-2.5 with tighter initial accuracy (±20 mV vs. ±30 mV) and lower temperature coefficient (20 ppm/°C vs. 50 ppm/°C), enabling drop-in upgrades in existing designs.
What is the maximum reverse current rating for LT1004IDG4-2-5?
The absolute maximum reverse current for LT1004IDG4-2-5 is 30 mA, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable long-term performance, design the current-setting resistor to limit reverse current to ≤20 mA under worst-case input voltage and temperature conditions, aligning with the device's recommended operating range.
Does LT1004IDG4-2-5 require external capacitors for stability?
No, LT1004IDG4-2-5 is inherently stable and does not require external capacitors for basic operation. Its two-terminal architecture and internal compensation eliminate oscillation risk under typical loads. However, a 100 nF ceramic capacitor placed directly at the anode-to-ground node is recommended in noisy environments (e.g., motor-driven systems) to suppress high-frequency interference that could modulate the reference voltage.
What is the reference impedance of LT1004IDG4-2-5 at 100 µA and 25°C?
The reference impedance of LT1004IDG4-2-5 is 0.2–0.6 Ω at 100 µA and 25°C, as specified in the Electrical Characteristics table. This low value ensures minimal voltage deviation (<60 µV) for a 100 µA change in load current-critical for maintaining accuracy in precision DAC or ADC reference applications where load variations occur dynamically.
LT1004IDG4-2-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.8%
- Temperature Coefficient:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 120µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 20 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LT1004IDG4-2-5 FAQ
1.How can I place an order for LT1004IDG4-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1004IDG4-2-5 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 LT1004IDG4-2-5 reliable?
The price and inventory of LT1004IDG4-2-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1004IDG4-2-5 is usually 5 days.
3.What payment methods are accepted for LT1004IDG4-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1004IDG4-2-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1004IDG4-2-5?
LT1004IDG4-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1004IDG4-2-5 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 LT1004IDG4-2-5?
For technical support, including LT1004IDG4-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1004IDG4-2-5 requirements.
6.How does Aetrix verify that LT1004IDG4-2-5 is sourced from the original manufacturer or authorized distributors?
All LT1004IDG4-2-5 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 LT1004IDG4-2-5 meets industry standards.
7.What is the process for return or replacement of LT1004IDG4-2-5?
All LT1004IDG4-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LT1004IDG4-2-5, 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 LT1004IDG4-2-5 part is unused and in its original packaging.
Return procedure for LT1004IDG4-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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