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Texas Instruments LT1004CPWG4-2-5
- Part No.:
- LT1004CPWG4-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LT1004CPWG4-2-5.pdf
- Description:
- IC VREF SHUNT 0.8% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,577
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Product details
Overview
LT1004CPWG4-2-5 from Texas Instruments is a micropower 2.5 V two-terminal band-gap voltage reference IC designed for precision analog systems requiring low quiescent current, high initial accuracy (±20 mV), and excellent temperature stability (20 ppm/°C). It operates from 8 µA to 20 mA and delivers stable reference voltage in battery-powered instrumentation, portable test equipment, and current-loop transmitters.
For engineers reviewing the LT1004CPWG4-2-5 datasheet, LT1004CPWG4-2-5 pinout, LT1004CPWG4-2-5 application, or LT1004CPWG4-2-5 equivalent, key selection criteria include its 2.5 V nominal output, TSSOP-8 package, 0°C to 70°C operating range, low 0.6 Ω reference impedance at 100 µA, and compatibility with LM285/LM385-based designs.
Technical Context
The LT1004CPWG4-2-5 implements a band-gap reference architecture with internal trimming to achieve ±20 mV initial accuracy across the 0°C to 70°C range. Its two-terminal configuration simplifies layout and reduces component count in low-power reference circuits.
It features very low reference impedance (0.2–0.6 Ω at 100 µA), broadband noise of 60–120 µV (10 Hz–10 kHz), and long-term drift of 20 ppm/khr - enabling stable performance in precision ADC/DAC biasing, sensor excitation, and regulated current-source applications without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Voltage | 2.5 V - precise output for 5 V regulator feedback, ADC reference, or DAC biasing |
| Initial Accuracy | ±20 mV - ensures ≤0.8% error at room temperature without trimming |
| Temp Coefficient | 20 ppm/°C - supports <±2.5 mV total drift over 0°C to 70°C |
| Reference Impedance | 0.6 Ω max at 100 µA - minimizes load-induced voltage shift in high-impedance circuits |
| Operating Current | 8–20 mA - enables operation down to 8 µA quiescent current for ultra-low-power systems |
| Noise (10 Hz–10 kHz) | 60–120 µV - suitable for 12-bit+ precision measurement front-ends |
| Long-Term Drift | 20 ppm/khr - maintains calibration integrity over years in unattended instrumentation |
Pinout & Package
TSSOP-8 package (PW drawing), 3.0 mm × 4.4 mm × 1.2 mm height, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current input terminal | Connects to positive supply or current source; sets reverse-bias operating point |
| Cathode | Reference output terminal | Provides stable 2.5 V output; must be decoupled with ≥0.1 µF capacitor for stability |
| Pins 3,4,6,7,8 | No internal connection | Unused; may be left floating or tied to ground for mechanical stability only |
Key Features
| Feature | Design Value |
|---|---|
| Two-terminal topology | Eliminates need for separate ground pin - reduces PCB area and routing complexity |
| Micropower operation | Functional down to 8 µA - extends battery life in portable meters and loop-powered sensors |
| Pin-for-pin replacement | Direct drop-in for LM285-2.5 and LM385-2.5 - enables legacy design upgrades without layout change |
| Low reference impedance | ≤0.6 Ω at 100 µA - maintains regulation under varying load conditions in precision current sources |
| Stable over temperature | 20 ppm/°C coefficient - avoids recalibration in industrial environments with ambient swings |
Applications
| Portable Test Instruments | Battery-Operated Systems |
|---|---|
Use Scenario: Handheld multimeter reference circuit requiring stable 2.5 V for ADC full-scale calibration. IC Role / Device Role / Timing Role: Two-terminal voltage reference providing primary scaling voltage for 16-bit sigma-delta ADC. Use Value: ±20 mV initial accuracy and 20 ppm/°C drift ensure ≤0.01% measurement error across 0–40°C operating range without factory trim. | Use Scenario: Low-power gas sensor transmitter using 4–20 mA current loop powered by single AA cell. IC Role / Device Role / Timing Role: Reference element in micropower current-source circuit setting loop compliance voltage. Use Value: 8 µA minimum operating current enables >5-year battery life; 0.6 Ω impedance prevents loop gain variation with load changes. |
| Current-Loop Instrumentation | Portable Meter Reference |
Use Scenario: Industrial process controller output stage delivering calibrated 4–20 mA signal to PLC input. IC Role / Device Role / Timing Role: Precision reference for op-amp-based Howland current source driving loop. Use Value: 20 ppm/°C tempco and 20 ppm/khr long-term drift maintain loop accuracy to ±0.1% over 10-year field deployment. | Use Scenario: Digital panel meter measuring 0–10 V DC inputs with auto-ranging and LCD display. IC Role / Device Role / Timing Role: Stable reference for internal 12-bit SAR ADC and digital scaling logic. Use Value: 60–120 µV broadband noise ensures <1 LSB noise floor; TSSOP-8 footprint fits compact 28 mm × 32 mm PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BIMX-2.5 | Higher initial tolerance (±30 mV), higher tempco (50 ppm/°C), SOIC-8 only | Less accurate over temperature; requires larger layout margin for thermal gradients | Select when cost priority outweighs accuracy and long-term stability requirements |
| REF3025AIDBZR | Lower noise (35 µV), better tempco (50 ppm/°C), 3-pin SOT23-3, 50 µA min current | Requires external ground connection; not pin-compatible; higher quiescent current | Select when lower noise dominates over micropower operation and board space constraints |
Compared with LM385BIMX-2.5, LT1004CPWG4-2-5 offers tighter initial accuracy and superior temperature stability; compared with REF3025AIDBZR, it achieves lower system power and simpler two-terminal integration but trades off noise performance and ground-referenced flexibility.
Availability
LT1004CPWG4-2-5 is available at Aetrix Electronics and suitable for portable test instruments, battery-operated systems, and current-loop instrumentation requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT1004CPWG4-2-5 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 leadership in precision analog ICs.
The LT1004 family was designed specifically for micropower, two-terminal voltage reference applications in portable, battery-constrained, and high-stability instrumentation systems where low quiescent current and minimal board space are critical.
FAQ
What is the operating temperature range for the LT1004CPWG4-2-5?
The LT1004CPWG4-2-5 is characterized for operation from 0°C to 70°C, matching the "C" grade specification per the TI datasheet SLVS022M. This range is validated across all electrical parameters including reference voltage, temperature coefficient, and impedance. Operation outside this range is not guaranteed and may result in increased drift or failure to regulate. The LT1004CPWG4-2-5 does not support extended industrial temperatures like the "I" grade variants.
Is the LT1004CPWG4-2-5 pin-compatible with LM285-2.5 and LM385-2.5?
Yes, the LT1004CPWG4-2-5 is explicitly specified as a pin-for-pin replacement for both LM285-2.5 and LM385-2.5 in the official TI datasheet. Its TSSOP-8 package maps Anode and Cathode identically, and unused pins (3,4,6,7,8) match the NC assignments of those legacy parts. No PCB redesign is required when upgrading to LT1004CPWG4-2-5, though improved specs - such as tighter initial accuracy and lower tempco - deliver immediate system-level benefits.
What is the minimum operating current for LT1004CPWG4-2-5?
The LT1004CPWG4-2-5 has a minimum reference current (IZ(min)) of 8 µA across its full operating temperature range (0°C to 70°C), as confirmed in the Electrical Characteristics table. Below this threshold, regulation is not guaranteed and output voltage may deviate significantly. For reliable 2.5 V output, the external current source must deliver ≥8 µA - a value easily achieved with high-value resistors (e.g., 1 MΩ from 10 V) in micropower designs.
Does LT1004CPWG4-2-5 require an output capacitor?
Yes, the LT1004CPWG4-2-5 requires a minimum 0.1 µF ceramic capacitor between Cathode and ground for stability, as stated in TI's application guidance and typical characteristics. Without this capacitor, the device may exhibit oscillation or excessive noise due to interaction with trace inductance and load capacitance. The capacitor should be placed within 2 mm of the Cathode pin, and X7R or C0G dielectrics are recommended for temperature stability.
How does the reference impedance of LT1004CPWG4-2-5 affect circuit design?
The LT1004CPWG4-2-5 exhibits a reference impedance of 0.2–0.6 Ω at 100 µA, rising to 1.5 Ω across full temperature range. This low impedance means output voltage shifts <1 mV under 1 mA load change - critical for maintaining accuracy in current-source circuits and ADC references. Designers must account for this impedance when calculating total error budget, especially in high-gain amplifier feedback paths where even milliohm variations impact gain stability.
LT1004CPWG4-2-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tray
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
LT1004CPWG4-2-5 FAQ
1.How can I place an order for LT1004CPWG4-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1004CPWG4-2-5 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 LT1004CPWG4-2-5 reliable?
The price and inventory of LT1004CPWG4-2-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1004CPWG4-2-5 is usually 5 days.
3.What payment methods are accepted for LT1004CPWG4-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1004CPWG4-2-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1004CPWG4-2-5?
LT1004CPWG4-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1004CPWG4-2-5 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 LT1004CPWG4-2-5?
For technical support, including LT1004CPWG4-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1004CPWG4-2-5 requirements.
6.How does Aetrix verify that LT1004CPWG4-2-5 is sourced from the original manufacturer or authorized distributors?
All LT1004CPWG4-2-5 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 LT1004CPWG4-2-5 meets industry standards.
7.What is the process for return or replacement of LT1004CPWG4-2-5?
All LT1004CPWG4-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LT1004CPWG4-2-5, 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 LT1004CPWG4-2-5 part is unused and in its original packaging.
Return procedure for LT1004CPWG4-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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