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Texas Instruments LT1004CPWR-1-2
- Part No.:
- LT1004CPWR-1-2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LT1004CPWR-1-2.pdf
- Description:
- IC VREF SHUNT 0.32% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:333
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Product details
Overview
LT1004CPWR-1-2 from Texas Instruments is a micropower two-terminal band-gap voltage reference diode 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 low-power reference in portable instrumentation and battery-operated systems.
For engineers reviewing the LT1004CPWR-1-2 datasheet, LT1004CPWR-1-2 pinout, LT1004CPWR-1-2 application, or LT1004CPWR-1-2 equivalent, key selection criteria include micropower current range (8–20 mA), low thermal drift (20 ppm/°C), reverse-voltage stability, TSSOP-8 package compatibility, and direct replacement capability for LM285/LM385 series references.
Technical Context
The LT1004CPWR-1-2 implements a band-gap reference architecture with internal trimming to achieve high initial accuracy without external adjustment. Its two-terminal configuration simplifies integration into current-loop and floating-reference topologies.
It features ultra-low quiescent current operation (as low as 8 µA), stable performance across 0°C to 70°C, and low dynamic impedance (≤1.5 Ω over full temperature range) enabling use in low-noise, high-PSRR analog signal chains where supply headroom is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Reference Voltage | 1.235 V at 100 µA - stable setpoint for ADCs, DACs, and sensor biasing |
| Initial Accuracy | ±4 mV - eliminates need for system-level trimming in cost-sensitive portable designs |
| Temp Coefficient | 20 ppm/°C - ensures ≤0.25 mV drift over 0°C to 70°C operating range |
| Reference Impedance | 0.6 Ω typical at 100 µA - minimizes load-induced voltage error in precision current sources |
| Operating Current Range | 8 µA to 20 mA - supports micropower sleep modes and higher-drive active states |
| Long-Term Stability | 20 ppm/khr - maintains calibration integrity in unattended industrial monitoring systems |
| Noise (10 Hz–10 kHz) | 60–120 µV - suitable for 12-bit to 14-bit data acquisition without additional filtering |
Pinout & Package
TSSOP-8 package (PW), 3.0 mm × 4.4 mm body, 1.2 mm max height, lead-free RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference current input terminal | Connects to regulated supply or current source; sets operating point via external resistor |
| Cathode | Reference voltage output terminal | Provides stable 1.235 V output; must be decoupled locally for noise-sensitive circuits |
| Pins 3, 4, 6, 7, 8 | No internal connection | Unused; may be left floating or grounded per layout best practices; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Two-terminal topology | Eliminates need for separate ground or supply pins-reduces BOM count and PCB footprint in current-source and loop-powered designs |
| Pin-for-pin replacement for LM285/LM385 | Enables drop-in upgrade path with improved accuracy (±4 mV vs ±20 mV) and lower tempco (20 ppm/°C vs 50–100 ppm/°C) |
| Micropower operation down to 8 µA | Extends battery life in portable meters and wireless sensors by minimizing standby current draw |
| Low 0.6 Ω dynamic impedance | Reduces output voltage variation under varying load conditions-critical for precision current mirrors and transducer excitation |
| Stable over 0°C to 70°C | Validated for commercial-grade embedded applications including handheld test gear and industrial HMI front-ends |
Applications
| Portable Meter Reference | Portable Test Instruments |
|---|---|
Use Scenario: Used as the primary voltage reference in handheld digital multimeters and clamp meters powered by alkaline or lithium cells. IC Role / Device Role / Timing Role: Two-terminal band-gap reference providing stable 1.235 V for ADC conversion and display driver biasing. Use Value: Enables ±0.1% measurement accuracy without trimming while consuming <10 µA in sleep mode. | Use Scenario: Integrated into battery-powered oscilloscope probes and signal generators requiring low-drift reference for amplitude calibration. IC Role / Device Role / Timing Role: Precision voltage setpoint for DAC-controlled output stages and internal gain-setting networks. Use Value: Delivers 20 ppm/°C stability across operating temperature, reducing recalibration frequency in field-deployed tools. |
| Battery-Operated Systems | Current-Loop Instrumentation |
Use Scenario: Supplies reference voltage for sensor signal conditioning in remote environmental monitors running on coin-cell or AA batteries. IC Role / Device Role / Timing Role: Low-quiescent-current (8 µA) reference enabling multi-year operation from primary cells. Use Value: Achieves >5-year battery life in 10-second wake-up interval sensing nodes due to sub-10 µA standby current. | Use Scenario: Embedded in 4–20 mA transmitter modules for pressure, flow, and temperature transducers in process control systems. IC Role / Device Role / Timing Role: Stable two-terminal reference establishing precise current-sense thresholds and loop compliance voltages. Use Value: Maintains 0.05% full-scale accuracy over -25°C to +70°C ambient, meeting IEC 61000-6-2 immunity requirements. |
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), 50 ppm/°C tempco, 10 µA min operating current | Lower accuracy and higher drift limit use in non-critical biasing; not suitable for 12-bit+ ADC references | Select when cost is primary constraint and ±1% tolerance is acceptable |
| REF3012AIDBZR | ±0.2% initial accuracy (2.5 mV), 50 ppm/°C tempco, 50 µA min current, 3-pin SOT-23 | Requires separate ground pin and higher minimum current; better accuracy but less flexible two-terminal topology | Select when highest initial accuracy is required and three-terminal layout is feasible |
Compared with LM385B-1.2/NOPB, LT1004CPWR-1-2 offers 3× tighter initial tolerance and half the tempco; compared with REF3012AIDBZR, it enables simpler two-terminal current-loop designs but trades off absolute accuracy for topology flexibility.
Availability
LT1004CPWR-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 consistent parametric performance across production lots.
Supply support for LT1004CPWR-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 broad industrial, automotive, and consumer product portfolios.
The LT1004 family was designed specifically for micropower, two-terminal voltage reference applications in portable and battery-constrained systems-emphasizing low operating current, high accuracy, and robust thermal stability without external components.
FAQ
What is the nominal reference voltage of the LT1004CPWR-1-2?
The LT1004CPWR-1-2 provides a nominal reference voltage of 1.235 V at 100 µA operating current, with a guaranteed range of 1.225 V to 1.245 V across the full 0°C to 70°C temperature range. This value is specified in the electrical characteristics table of the TI SLVS022M datasheet and applies directly to the LT1004CPWR-1-2 variant.
Can the LT1004CPWR-1-2 replace the LM285-1.2 in existing designs?
Yes, the LT1004CPWR-1-2 is explicitly characterized as a pin-for-pin replacement for the LM285 and LM385 series, with identical TSSOP-8 pinout and two-terminal functionality. It improves upon the LM285-1.2 with tighter initial accuracy (±4 mV vs ±20 mV) and lower temperature coefficient (20 ppm/°C vs 50 ppm/°C), making LT1004CPWR-1-2 a direct upgrade without layout changes.
What is the minimum operating current for the LT1004CPWR-1-2?
The LT1004CPWR-1-2 has a minimum operating current (IZ(min)) of 8 µA across its full temperature range (0°C to 70°C). Below this threshold, regulation degrades; operation at 10 µA or higher is recommended for guaranteed specification compliance. This ultra-low requirement enables LT1004CPWR-1-2 use in energy-harvesting and long-life battery applications.
Does the LT1004CPWR-1-2 require external capacitors for stability?
No, the LT1004CPWR-1-2 does not require external capacitors for basic DC stability due to its inherent two-terminal band-gap design. However, a 100 nF ceramic capacitor placed between cathode and anode is recommended for noise reduction in sensitive applications such as high-resolution ADC references. The device remains stable without it, unlike many three-terminal references that mandate output capacitance.
What is the thermal resistance (θJA) of the LT1004CPWR-1-2 package?
The LT1004CPWR-1-2 in the TSSOP-8 (PW) package has a junction-to-ambient thermal resistance (θJA) of 149°C/W, as specified in the Absolute Maximum Ratings section of the SLVS022M datasheet. This value assumes standard JEDEC test board conditions; actual thermal performance improves with copper pour and thermal vias in production layouts.
LT1004CPWR-1-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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-TSSOP
LT1004CPWR-1-2 FAQ
1.How can I place an order for LT1004CPWR-1-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1004CPWR-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 LT1004CPWR-1-2 reliable?
The price and inventory of LT1004CPWR-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 LT1004CPWR-1-2 is usually 5 days.
3.What payment methods are accepted for LT1004CPWR-1-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1004CPWR-1-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1004CPWR-1-2?
LT1004CPWR-1-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1004CPWR-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 LT1004CPWR-1-2?
For technical support, including LT1004CPWR-1-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1004CPWR-1-2 requirements.
6.How does Aetrix verify that LT1004CPWR-1-2 is sourced from the original manufacturer or authorized distributors?
All LT1004CPWR-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 LT1004CPWR-1-2 meets industry standards.
7.What is the process for return or replacement of LT1004CPWR-1-2?
All LT1004CPWR-1-2 units undergo pre-shipment inspection (PSI). If there is an issue with LT1004CPWR-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 LT1004CPWR-1-2 part is unused and in its original packaging.
Return procedure for LT1004CPWR-1-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1004CPWR-1-2 Tags
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