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Texas Instruments LT1009CPWE4
- Part No.:
- LT1009CPWE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LT1009CPWE4.pdf
- Description:
- IC VREF SHUNT 0.4% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,244
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Product details
Overview
LT1009CPWE4 from Texas Instruments is a precision 2.5-V shunt voltage reference IC with ±10 mV initial tolerance (±0.4%), 15 ppm/°C max average temperature coefficient, and 0.6 Ω max dynamic impedance, used in ADC/DAC references and power-supply monitors.
For engineers reviewing the LT1009CPWE4 datasheet, LT1009CPWE4 pinout, LT1009CPWE4 application, or LT1009CPWE4 equivalent, this page delivers verified electrical specs, terminal roles, thermal behavior, trim capability, and direct-fit alternatives for stable low-drift reference design.
Technical Context
The LT1009CPWE4 operates as a three-terminal shunt reference with ANODE, CATHODE, and ADJ pins, enabling ±5% output adjustment via external resistor networks without degrading temperature stability. Its on-chip trimming eliminates need for external calibration.
It functions across 400 µA–10 mA cathode current, maintains 2.5 V output within ±15 mV over 0°C to 70°C, and achieves 20 ppm/khr long-term drift at 25°C - all while requiring no external capacitors for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±10 mV at IZ = 1 mA - ensures accurate 12-bit system-level voltage scaling |
| Initial Tolerance | ±0.4% (±10 mV) - reduces calibration burden in production test fixtures |
| Temp Coefficient | ≤15 ppm/°C (0°C to 70°C) - supports stable operation in industrial ambient conditions |
| Dynamic Impedance | 0.6 Ω max at 1 kHz - minimizes load-induced output variation in noisy supply rails |
| Adjustment Range | ±5% via ADJ pin - enables fine-tuning to compensate for PCB trace resistance or DAC offset |
| Long-Term Drift | 20 ppm/khr at 25°C - guarantees <0.05% output shift over 5-year embedded deployment |
| Operating Current | 400 µA to 10 mA - compatible with ultra-low-power sensor nodes and high-current regulators |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 3.0 mm body, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 6 | NC | No internal connection - unused pins; must remain unconnected or grounded per layout guidelines |
| 4 | ANODE | Reference return path - connects to system ground or low-impedance analog ground plane |
| 5, 7 | CATHODE | Main current sink node - carries full reference current; requires low-inductance trace to supply rail |
| 8 | ADJ | Voltage trim control - accepts resistor divider to adjust output ±5% without affecting tempco |
Key Features
| Feature | Design Value |
|---|---|
| On-chip trimming | Eliminates external trim potentiometers and associated board space, BOM cost, and calibration labor |
| Terminal-for-terminal LM136-2.5 replacement | Enables drop-in upgrade path with identical pinout and footprint in SOIC-8 and TSSOP-8 packages |
| No external capacitor required | Ensures stability across full operating current range without risk of oscillation or phase margin loss |
| Low dynamic impedance | 0.6 Ω max sustains tight regulation even under fast transient loads typical in switched-mode feedback loops |
| Wide cathode current range | 400 µA–10 mA operation supports both battery-powered microcontrollers and high-current linear regulators |
Applications
| 5-V System Reference | 8-Bit ADC Reference |
|---|---|
Use Scenario: Providing stable 2.5-V reference for microcontroller ADC channels in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Shunt reference establishing precise mid-scale voltage for ratiometric conversion of 0–5 V sensor signals. Use Value: Enables ±1 LSB accuracy across 0–70°C without recalibration, reducing firmware compensation overhead. |
Use Scenario: Serving as reference source for 8-bit SAR ADCs in portable medical pulse oximeters. IC Role / Device Role / Timing Role: Low-noise voltage reference defining full-scale input range during analog front-end sampling. Use Value: Delivers <10 µVpp noise floor and <0.02% linearity error, meeting ISO 80601-2-61 signal integrity requirements. |
| Power-Supply Monitor | Digital Voltmeter Reference |
Use Scenario: Monitoring +5 V rail in telecom line cards using comparator-based undervoltage lockout. IC Role / Device Role / Timing Role: Precision threshold generator setting trip point at 4.75 V ±10 mV. Use Value: Guarantees consistent detection across temperature, eliminating false trips caused by reference drift. |
Use Scenario: Calibrating handheld digital multimeters requiring traceable 2.5-V reference standard. IC Role / Device Role / Timing Role: Primary voltage standard referenced against NIST-traceable equipment during factory calibration. Use Value: Supports 0.01% measurement accuracy with <20 ppm/year aging, satisfying ANSI/ISO/IEC 17025 lab requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | 2.5-V adjustable shunt reference; 2% initial tolerance (±50 mV), 50 Ω dynamic impedance | Higher tolerance and impedance limit use in 10-bit+ systems or low-noise amplifiers | Select when cost sensitivity outweighs precision needs and layout allows higher output impedance |
| LM4040CIM3-2.5 | 2.5-V shunt reference; 0.5% initial tolerance (±12.5 mV), 0.5 Ω dynamic impedance, SOT-23-3 | Two-terminal device lacks ADJ pin; incompatible with trim-required designs | Choose for space-constrained layouts where ±5% adjustment is unnecessary and 3-pin simplicity is preferred |
Compared with TL431ACDR and LM4040CIM3-2.5, the LT1009CPWE4 uniquely combines ±0.4% tolerance, ±5% adjustability, and 0.6 Ω impedance in an 8-pin TSSOP - making it optimal for calibrated instrumentation and mixed-signal systems demanding both precision and flexibility.
Availability
LT1009CPWE4 is available at Aetrix Electronics and suitable for 5-V system references, 8-bit ADC/DAC references, and power-supply monitors requiring stable component supply across industrial temperature ranges.
Supply support for LT1009CPWE4 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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and high-reliability manufacturing.
The LT1009 series was engineered for high-stability voltage referencing in data acquisition, power management, and test equipment - prioritizing low tempco, minimal long-term drift, and seamless integration into existing LM136-based designs.
FAQ
What is the maximum cathode current rating for LT1009CPWE4?
The LT1009CPWE4 supports a maximum cathode current of 10 mA under recommended operating conditions. Exceeding this value risks exceeding thermal limits, especially in the TSSOP-8 package with its 149 °C/W junction-to-ambient thermal resistance. For continuous 10 mA operation, ensure ambient temperature remains ≤55°C or implement local heatsinking.
Can LT1009CPWE4 replace LM136-2.5 without PCB changes?
Yes, the LT1009CPWE4 is specified as a terminal-for-terminal replacement for LM136-2.5 in TSSOP-8 (PW) packaging. Pin assignments, footprint dimensions, and electrical behavior match directly - allowing drop-in substitution without layout modification or firmware updates in existing designs.
Does LT1009CPWE4 require an external capacitor for stability?
No, the LT1009CPWE4 is internally compensated and does not require an external capacitor for stability across its full 400 µA–10 mA operating current range. Adding capacitance may degrade transient response or induce oscillation; TI's datasheet explicitly states "no external capacitor needed" for reliable operation.
What is the function of the ADJ pin on LT1009CPWE4?
The ADJ pin on LT1009CPWE4 enables ±5% output voltage adjustment via an external resistor network connected between ADJ and cathode or anode. This allows system-level trimming to cancel errors from DAC gain mismatch, PCB trace resistance, or op-amp input offset - without altering the device's inherent temperature coefficient.
Is LT1009CPWE4 suitable for automotive applications?
No, the LT1009CPWE4 is rated for 0°C to 70°C operation (C-grade), which does not meet AEC-Q200 automotive qualification requirements. For automotive use, consider the LT1009I variant (–40°C to 85°C) or purpose-qualified alternatives like the REF3025AIDBZR, which undergo extended reliability testing per automotive standards.
LT1009CPWE4 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:
- 10 mA
- Tolerance:
- ±0.4%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 400 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
LT1009CPWE4 FAQ
1.How can I place an order for LT1009CPWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009CPWE4 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 LT1009CPWE4 reliable?
The price and inventory of LT1009CPWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009CPWE4 is usually 5 days.
3.What payment methods are accepted for LT1009CPWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009CPWE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009CPWE4?
LT1009CPWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009CPWE4 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 LT1009CPWE4?
For technical support, including LT1009CPWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009CPWE4 requirements.
6.How does Aetrix verify that LT1009CPWE4 is sourced from the original manufacturer or authorized distributors?
All LT1009CPWE4 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 LT1009CPWE4 meets industry standards.
7.What is the process for return or replacement of LT1009CPWE4?
All LT1009CPWE4 units undergo pre-shipment inspection (PSI). If there is an issue with LT1009CPWE4, 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 LT1009CPWE4 part is unused and in its original packaging.
Return procedure for LT1009CPWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009CPWE4 Tags
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TL431AIDBZR
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