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Texas Instruments LT1004IPW-1-2
- Part No.:
- LT1004IPW-1-2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LT1004IPW-1-2.pdf
- Description:
- IC VREF SHUNT 0.32% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,143
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Product details
Overview
LT1004IPW-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 supply current and supports industrial temperature range (−40°C to +85°C) in TSSOP-8 package for precision low-power analog systems.
For engineers reviewing the LT1004IPW-1-2 datasheet, LT1004IPW-1-2 pinout, LT1004IPW-1-2 application, or LT1004IPW-1-2 equivalent, key selection criteria include micropower operation down to 8 µA, low thermal drift, high stability over temperature, and compatibility with battery-operated instrumentation requiring stable 1.2 V reference without trimming.
Technical Context
The LT1004IPW-1-2 implements a band-gap reference architecture with internal curvature compensation, enabling stable 1.235 V output across −40°C to +85°C. Its two-terminal configuration functions as a shunt reference, sinking current through the cathode while maintaining precise voltage across anode-to-cathode terminals.
Designed for ultra-low quiescent current, it achieves 20 ppm/°C average temperature coefficient and 60 µV broadband noise (10 Hz–10 kHz) at 100 µA bias. The device features 0.2 Ω typical dynamic impedance at 100 µA and long-term stability of 20 ppm/khr.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Output Voltage | 1.235 V - Precise band-gap reference voltage at 100 µA, used as stable bias point for ADCs, DACs, and sensor signal chains. |
| Initial Accuracy | ±4 mV - Ensures ≤0.33% absolute error at room temperature without calibration or trimming. |
| Temp Coefficient | 20 ppm/°C - Limits output drift to ±1.7 mV over full −40°C to +85°C range, critical for portable metering. |
| Ref Impedance | 0.6 Ω @ 100 µA - Enables low-output-impedance regulation even at microamp bias, reducing load-induced errors. |
| Min Operating Current | 8 µA - Allows operation from weak sources like thermocouples or high-impedance dividers in cold-junction compensation. |
| Noise (10 Hz–10 kHz) | 60 µV - Low broadband noise preserves SNR in precision 16-bit+ data acquisition front-ends. |
| Long-Term Stability | 20 ppm/khr - Predictable aging behavior supports 10+ year field reliability in unattended monitoring systems. |
Pinout & Package
TSSOP-8 package (PW), 3.0 mm × 4.4 mm × 1.2 mm height, moisture sensitivity level 1, RoHS-compliant with NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference output node | Connected to system ground or low-impedance return; voltage referenced to cathode terminal. |
| Cathode (Pin 2) | Current sink terminal | Sinks all operating current; must be connected to positive supply via series resistor or active current source. |
| Pins 3, 4, 6, 7, 8 | No internal connection | Unbonded; electrically isolated-no routing or PCB copper required. |
| Pin 5 | Cathode (redundant) | Internally tied to Pin 2; provides second cathode pad for improved thermal dissipation or layout flexibility. |
Key Features
| Feature | Design Value |
|---|---|
| Two-terminal shunt topology | Eliminates need for external op-amp or feedback network-simplifies PCB layout and reduces BOM count in space-constrained designs. |
| Micropower operation (8 µA min) | Enables direct use with high-value resistive dividers or thermistor networks where sourcing current is impractical. |
| Pin-for-pin replacement for LM285/LM385 | Allows drop-in upgrade of legacy 1.2 V references with improved accuracy, lower tempco, and tighter impedance specs. |
| Low 60 µV broadband noise | Preserves resolution in low-frequency precision applications such as digital multimeters and strain-gauge amplifiers. |
| Industrial temperature grade (−40°C to +85°C) | Validated performance across full range ensures consistent behavior in outdoor, automotive, and factory-floor environments. |
Applications
| Portable Meter Reference | Portable Test Instruments |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 1.2 V reference for 16-bit ADC conversion under varying battery voltage (6–9 V). IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing fixed 1.235 V reference node independent of supply rail fluctuations. Use Value: ±4 mV initial accuracy and 20 ppm/°C tempco ensure <0.02% measurement error across operating temperature and battery life. | Use Scenario: Battery-powered oscilloscope probe calibration circuit needing low-drift reference for offset nulling. IC Role / Device Role / Timing Role: Precision voltage source establishing DC bias point for op-amp input stages during auto-zero sequences. Use Value: 0.6 Ω reference impedance minimizes interaction with high-Z calibration potentiometers, preserving linearity. |
| Battery-Operated Systems | Current-Loop Instrumentation |
Use Scenario: Wireless sensor node powered by CR2032 coin cell (3 V, ~225 mAh), operating for >5 years on single battery. IC Role / Device Role / Timing Role: Micropower reference supplying excitation voltage to RTD bridge and reference for low-power SAR ADC. Use Value: 8 µA minimum operating current enables continuous reference operation while consuming <0.02% of total system budget. | Use Scenario: 4–20 mA transmitter module converting temperature sensor output into loop current with 0.1% accuracy. IC Role / Device Role / Timing Role: Stable 1.235 V reference setting gain and zero points for current-output amplifier stage. Use Value: Long-term stability of 20 ppm/khr limits calibration drift to <0.05% over 5-year deployment without field recalibration. |
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-1.2 | ±1% initial accuracy (12 mV), 100 ppm/°C tempco, 20 Ω impedance - looser spec across all key parameters. | Acceptable only in non-critical consumer-grade meters; insufficient for industrial 0.1% accuracy requirements. | Select when cost is primary constraint and performance margin allows ≥3× degradation in accuracy and stability. |
| REF3012AIDBVR | 1.2 V output, ±0.2% initial accuracy (2.4 mV), 50 ppm/°C tempco, 120 µV noise - higher accuracy but higher noise and wider tempco. | Better initial tolerance but inferior thermal stability; requires additional filtering in low-drift applications. | Prefer for applications prioritizing room-temp calibration accuracy over wide-temperature consistency. |
Compared with LM385BIMX-1.2, LT1004IPW-1-2 delivers 3× tighter initial accuracy and 5× lower tempco; versus REF3012AIDBVR, it trades 0.2 mV better initial tolerance for 3× lower thermal drift and 50% less noise-making it optimal for battery-powered instruments demanding long-term stability.
Availability
LT1004IPW-1-2 is available at Aetrix Electronics and suitable for portable meter reference, portable test instruments, and battery-operated systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT1004IPW-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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 50 years of leadership in precision analog design.
The LT1004 family was developed to deliver high-accuracy voltage references at micropower levels for portable and battery-critical applications, addressing the gap between traditional shunt references and power-hungry series references.
FAQ
What is the operating current range for the LT1004IPW-1-2?
The LT1004IPW-1-2 operates from a minimum reference current of 8 µA up to 20 mA. At 100 µA, it delivers its specified 1.235 V output with ±4 mV initial accuracy and 20 ppm/°C temperature coefficient. Its micropower capability enables use in ultra-low-current sensor interfaces where conventional references fail.
Is the LT1004IPW-1-2 pin-compatible with older voltage references?
Yes, the LT1004IPW-1-2 is a pin-for-pin replacement for the LM285 and LM385 series in TSSOP-8 footprint. Its anode (Pin 1) and cathode (Pin 2) match the standard two-terminal shunt configuration, and Pins 3, 4, 6, 7, 8 are no-connect-ensuring direct board-level substitution without layout changes.
What is the maximum reverse current rating for the LT1004IPW-1-2?
The absolute maximum reverse current for the LT1004IPW-1-2 is 30 mA. Exceeding this value risks permanent damage. In normal operation, the device is biased within 8 µA to 20 mA, and the 30 mA limit provides safety margin against transient overcurrent events in current-loop or fault-tolerant designs.
How does the LT1004IPW-1-2 achieve low temperature coefficient?
The LT1004IPW-1-2 achieves 20 ppm/°C average temperature coefficient through proprietary band-gap core design with curvature compensation and matched transistor processing. This eliminates the need for external trimming while maintaining stability across −40°C to +85°C-verified in production test across the full industrial temperature range.
Can the LT1004IPW-1-2 be used in a series-reference configuration?
No, the LT1004IPW-1-2 is strictly a two-terminal shunt reference and cannot operate as a series reference. It must be connected with anode to ground (or low-impedance node) and cathode to a current source or resistor tied to a positive supply. Attempting series-mode connection will prevent proper regulation and may damage the device.
LT1004IPW-1-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
LT1004IPW-1-2 FAQ
1.How can I place an order for LT1004IPW-1-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1004IPW-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 LT1004IPW-1-2 reliable?
The price and inventory of LT1004IPW-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 LT1004IPW-1-2 is usually 5 days.
3.What payment methods are accepted for LT1004IPW-1-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1004IPW-1-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1004IPW-1-2?
LT1004IPW-1-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1004IPW-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 LT1004IPW-1-2?
For technical support, including LT1004IPW-1-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1004IPW-1-2 requirements.
6.How does Aetrix verify that LT1004IPW-1-2 is sourced from the original manufacturer or authorized distributors?
All LT1004IPW-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 LT1004IPW-1-2 meets industry standards.
7.What is the process for return or replacement of LT1004IPW-1-2?
All LT1004IPW-1-2 units undergo pre-shipment inspection (PSI). If there is an issue with LT1004IPW-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 LT1004IPW-1-2 part is unused and in its original packaging.
Return procedure for LT1004IPW-1-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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