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Texas Instruments LT1004CPW-1-2
- Part No.:
- LT1004CPW-1-2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LT1004CPW-1-2.pdf
- Description:
- IC VREF SHUNT 0.32% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,500
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Product details
Overview
LT1004CPW-1-2 from Texas Instruments is a two-terminal micropower 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 serves as precision reference in portable instrumentation and battery-powered systems.
For engineers reviewing the LT1004CPW-1-2 datasheet, LT1004CPW-1-2 pinout, LT1004CPW-1-2 application, or LT1004CPW-1-2 equivalent, key selection criteria include its 1.2 V nominal output, TSSOP-8 package, 0°C to 70°C operating range, low 60 µV broadband noise, and compatibility with current-loop transmitters requiring stable low-power references.
Technical Context
The LT1004CPW-1-2 implements a band-gap reference architecture optimized for micropower operation, achieving stable 1.235 V output across 8 µA–20 mA load current. Its internal design minimizes temperature drift via curvature-compensated bipolar transistor structures and precision trimming.
It functions as a two-terminal device-cathode and anode-with no ground or supply pin-enabling simple integration into series-shunt regulator topologies and current-source biasing networks. Terminal configuration supports both forward-bias (voltage source) and reverse-bias (current-sink reference) modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Output Voltage | 1.235 V at 100 µA - precise setpoint for ADC/DAC biasing and sensor excitation |
| Initial Accuracy | ±4 mV - enables calibration-free designs in portable meters and loop-powered transmitters |
| Temp Coefficient | 20 ppm/°C - ensures ≤1.25 mV drift over 0°C to 70°C ambient range |
| Reference Impedance | 0.6 Ω at 100 µA - maintains regulation stability under dynamic load steps in low-noise amplifiers |
| Operating Current Range | 8 µA to 20 mA - supports ultra-low-power sleep modes and high-current buffer drive |
| Broadband Noise | 60 µV RMS (10 Hz–10 kHz) - suitable for 12-bit precision measurement front-ends |
| Long-Term Drift | 20 ppm/khr - ensures <0.2% output shift over 10-year field deployment |
Pinout & Package
TSSOP-8 package (PW), 3.0 mm × 4.4 mm × 1.2 mm height, lead-free NiPdAu finish, JEDEC MO-153 compliant. Pin 1 marked by beveled corner; pins 6 and 8 internally connected to cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Input terminal for reverse-bias operation; connects to higher-potential node in shunt reference configuration |
| Pins 2–5, 7 | No Connection | Internally unconnected; must remain floating or grounded per layout guidelines to avoid parasitic coupling |
| Pins 6 & 8 | Cathode | Output/reference terminal; tied together internally; sinks current to establish regulated voltage at anode |
Key Features
| Feature | Design Value |
|---|---|
| Two-terminal topology | Eliminates need for separate supply rail or ground connection-reduces BOM count and PCB area in space-constrained modules |
| Micropower operation | Functional down to 8 µA quiescent current-enables >10-year battery life in wireless sensor nodes using CR2032 cells |
| Low reference impedance | 0.6 Ω typical at 100 µA-minimizes output voltage sag during transient loading in precision current sources |
| Pin-for-pin replacement | Direct drop-in for LM285-1.2 and LM385-1.2-allows legacy design upgrades without layout changes |
| Stable over wide current range | ΔVZ ≤ 10 mV from 1 mA to 20 mA-supports direct driving of op-amp inputs without buffering |
Applications
| Portable Meter Reference | Portable Test Instruments |
|---|---|
Use Scenario: Handheld multimeter requiring stable 1.2 V reference for 16-bit SAR ADC scaling and auto-zero calibration. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing ratiometric accuracy against internal DAC and comparator thresholds. Use Value: ±4 mV initial tolerance and 20 ppm/°C drift enable Class II meter compliance without factory trimming. | Use Scenario: Battery-powered oscilloscope probe compensator needing low-drift DC offset adjustment. IC Role / Device Role / Timing Role: Precision voltage source for calibrating vertical amplifier gain stages and trigger threshold comparators. Use Value: 60 µV broadband noise ensures <0.01% RMS error in 100 mV full-scale offset calibration. |
| Battery-Operated Systems | Current-Loop Instrumentation |
Use Scenario: Wireless temperature transmitter powered by single AA cell (0.9–1.5 V) with 10-year lifetime target. IC Role / Device Role / Timing Role: Low-current reference enabling micropower LDO and sensor signal conditioning chain. Use Value: 8 µA minimum operating current allows continuous operation even at end-of-life battery voltage (0.9 V). | Use Scenario: 4–20 mA industrial transmitter where reference sets loop current via precision resistor and op-amp. IC Role / Device Role / Timing Role: Stable 1.235 V reference establishing exact current setpoint (e.g., 1.235 V / 61.75 Ω = 20 mA). Use Value: 0.6 Ω output impedance prevents current error drift under varying loop compliance voltage (12–40 V). |
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, 20 Ω impedance | Higher drift limits use in sub-12-bit systems; requires external trimming for metrology-grade accuracy | Select when cost sensitivity outweighs precision requirements and board space permits larger SOIC-8 footprint |
| REF3012AIDBVR | ±0.2% initial accuracy (2.4 mV), 50 ppm/°C tempco, 120 µA quiescent current | Three-terminal architecture requires dedicated ground pin; unsuitable for two-wire current-loop topologies | Choose for higher-accuracy applications where ground-referenced layout is acceptable and power budget allows >100 µA |
Compared with LM385BIMX-1.2, LT1004CPW-1-2 delivers 3× better initial accuracy and 5× lower tempco; versus REF3012AIDBVR, it enables simpler two-terminal wiring but trades off absolute accuracy for micropower operation and topology flexibility.
Availability
LT1004CPW-1-2 is available at Aetrix Electronics and suitable for portable meter reference, current-loop instrumentation, and battery-operated systems requiring stable component supply with guaranteed long-term continuity.
Supply support for LT1004CPW-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 since 1930.
The LT1004 series was designed specifically for micropower, two-terminal voltage referencing in portable and loop-powered instrumentation-prioritizing low operating current, tight initial tolerance, and minimal thermal drift over speed or output drive capability.
FAQ
What is the operating temperature range for the LT1004CPW-1-2?
The LT1004CPW-1-2 is characterized for operation from 0°C to 70°C. This commercial-grade rating is specified in the ordering information table and confirmed in the "recommended operating conditions" section of the SLVS022M datasheet. The 'C' suffix denotes the 0°C to 70°C grade, distinct from the 'I' grade (−40°C to 85°C) used in LT1004IPW-1-2. Thermal derating is not required within this range.
Can the LT1004CPW-1-2 replace the LM285-1.2 directly?
Yes, the LT1004CPW-1-2 is explicitly stated as a pin-for-pin replacement for the LM285 and LM385 series, with improved specifications. Both devices use identical TSSOP-8 pinouts (anode on pin 1, cathode on pins 6/8), share two-terminal operation, and maintain compatible electrical behavior across the 10 µA–20 mA current range. No PCB changes are required for migration.
What is the minimum operating current for LT1004CPW-1-2?
The LT1004CPW-1-2 has a minimum reference current (IZ(min)) of 8 µA across its full operating temperature range (0°C to 70°C). This value is specified in the "electrical characteristics" table under IZ(min) and enables ultra-low-power operation in battery-backed memory retention circuits and energy-harvesting sensors where supply current is severely constrained.
How does the LT1004CPW-1-2 achieve low temperature drift?
The LT1004CPW-1-2 achieves 20 ppm/°C average temperature coefficient through curvature-compensated band-gap core design, precision laser trimming of on-chip resistors, and matched transistor geometries that cancel first- and second-order thermal effects. This is verified by the "Reference voltage vs Free-air temperature" plot (Figure 4), showing ≤1.25 mV total variation from 0°C to 70°C at 100 µA bias.
Is the LT1004CPW-1-2 RoHS compliant and lead-free?
Yes, the LT1004CPW-1-2 is RoHS compliant and lead-free. Per the TI Package Option Addendum, its eco plan is "Green (RoHS & no Sb/Br)" with "NIPDAU" (nickel-palladium-gold) lead finish. It meets JEDEC MSL Level-1 moisture sensitivity classification and is qualified for lead-free reflow soldering at peak temperatures up to 260°C.
LT1004CPW-1-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tray
- 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
LT1004CPW-1-2 FAQ
1.How can I place an order for LT1004CPW-1-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1004CPW-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 LT1004CPW-1-2 reliable?
The price and inventory of LT1004CPW-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 LT1004CPW-1-2 is usually 5 days.
3.What payment methods are accepted for LT1004CPW-1-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1004CPW-1-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1004CPW-1-2?
LT1004CPW-1-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1004CPW-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 LT1004CPW-1-2?
For technical support, including LT1004CPW-1-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1004CPW-1-2 requirements.
6.How does Aetrix verify that LT1004CPW-1-2 is sourced from the original manufacturer or authorized distributors?
All LT1004CPW-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 LT1004CPW-1-2 meets industry standards.
7.What is the process for return or replacement of LT1004CPW-1-2?
All LT1004CPW-1-2 units undergo pre-shipment inspection (PSI). If there is an issue with LT1004CPW-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 LT1004CPW-1-2 part is unused and in its original packaging.
Return procedure for LT1004CPW-1-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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