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Texas Instruments LT1009CPWR
- Part No.:
- LT1009CPWR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LT1009CPWR.pdf
- Description:
- IC VREF SHUNT 0.4% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,973
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Product details
Overview
LT1009CPWR from Texas Instruments is a precision 2.5-V shunt voltage reference IC in an 8-pin TSSOP package, featuring ±10 mV initial tolerance (±0.4%), 0.6 Ω max dynamic impedance at 1 mA, and ±5% adjustable output via ADJ pin. It operates from 0°C to 70°C and serves as a stable reference for ADCs, DACs, and power-supply monitors.
For engineers reviewing the LT1009CPWR datasheet, LT1009CPWR pinout, LT1009CPWR application, or LT1009CPWR equivalent, this page delivers verified electrical specs, validated pin functions, confirmed thermal and trimming behavior, and real-world use cases - all aligned with TI's SLVS013N revision May 2009 specification.
Technical Context
The LT1009CPWR implements a bandgap-based shunt reference architecture with on-chip laser trimming to minimize both initial error and temperature coefficient (αVZ). Its three-terminal configuration (ANODE, CATHODE, ADJ) enables system-level calibration without external components.
It delivers stable 2.5 V output across 400 µA–10 mA cathode current, with full-range temperature drift limited to 15 mV (0°C–70°C) and average αVZ of 15 ppm/°C. Dynamic impedance remains ≤0.6 Ω at 1 mA, supporting low-noise, high-PSRR applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.49 V to 2.51 V at 1 mA (D/PW package); ensures ≤±0.4% accuracy for 8-bit converter references. |
| Initial Tolerance | ±10 mV max (±0.4%) at 25°C; eliminates need for external trimming in cost-sensitive systems. |
| Dynamic Impedance | 0.6 Ω max at 1 mA; maintains tight regulation under fast load transients in precision analog circuits. |
| Temp. Coefficient | 15 ppm/°C typical (0°C–70°C); enables stable performance in industrial ambient without compensation. |
| Adjustment Range | ±5% via ADJ pin; allows fine-tuning to cancel system gain/offset errors without redesigning feedback networks. |
| Operating Current | 400 µA to 10 mA cathode current; supports ultra-low-power sensor interfaces and high-current reference buffers. |
| Long-Term Drift | 20 ppm/khr at 25°C; ensures reference stability over years in deployed instrumentation and metering equipment. |
Pinout & Package
LT1009CPWR uses an 8-pin TSSOP (PW) package, 3.0 mm × 4.4 mm × 1.2 mm height, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating. Pin 1 is located at top-left corner (quadrant Q1), with no internal connection on pins 1–3 and 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 6 | No internal connection (NC) | Unused pins; must be left floating or tied to ground per layout best practice - no routing required. |
| 4 | Anode | Connects to system ground or low-side return path; defines reference potential reference point. |
| 5, 7 | Cathode | Dual cathode terminals reduce parasitic resistance; share current path to maintain <0.6 Ω dynamic impedance. |
| 8 | Adjust (ADJ) | Enables ±5% output tuning via external resistor divider; open-circuit default yields nominal 2.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip laser trimming | Reduces initial VZ error to ±10 mV and minimizes αVZ, eliminating factory calibration steps. |
| Three-terminal adjustability | ADJ pin enables ±5% output tuning without external op-amps or trim pots - simplifies BOM and layout. |
| Terminal-for-terminal LM136-2.5 replacement | Direct drop-in substitute in SOIC-8 and TSSOP-8 footprints; retains same pinout and electrical interface. |
| Low dynamic impedance | 0.6 Ω max at 1 mA ensures minimal output shift during transient loading - critical for SAR ADC reference stability. |
| Wide operating current range | Functional from 400 µA to 10 mA cathode current, enabling use in both ultra-low-power IoT sensors and high-drive buffer stages. |
Applications
| Industrial Data Acquisition | Programmable Logic Controller (PLC) Analog I/O |
|---|---|
Use Scenario: High-resolution 16-bit ADC front-end in environmental monitoring systems requiring stable reference over 0°C–70°C. IC Role / Device Role / Timing Role: Shunt reference providing 2.5 V excitation and conversion基准 for successive-approximation ADCs. Use Value: ±10 mV initial tolerance and 15 ppm/°C tempco ensure <0.01% total unadjusted error across operating range. |
Use Scenario: Isolated analog input module measuring 4–20 mA loop signals with galvanically separated signal conditioning. IC Role / Device Role / Timing Role: Primary voltage reference for precision op-amp gain stages and sigma-delta ADC reference buffers. Use Value: Dual cathode pins (pins 5 & 7) lower effective series resistance, improving PSRR and reducing noise coupling into isolated domains. |
| Medical Instrumentation | Test & Measurement Equipment |
Use Scenario: Portable ECG amplifier with battery-powered rail-to-rail input stage requiring low-drift DC bias generation. IC Role / Device Role / Timing Role: Low-current shunt reference establishing common-mode voltage for instrumentation amplifiers. Use Value: 400 µA minimum operating current enables operation from coin-cell sources while maintaining <20 ppm/khr long-term stability. |
Use Scenario: Benchtop digital multimeter (DMM) reference subsystem needing traceable 2.5 V source with ±5% field calibration capability. IC Role / Device Role / Timing Role: Adjustable shunt reference used in auto-ranging reference ladder and ADC calibration circuitry. Use Value: ADJ pin allows end-user calibration to NIST-traceable standards without modifying PCB layout or component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | 2.495 V nominal, 2% initial tolerance (±50 mV), higher 0.2 Ω typical ZZ, no ADJ pin - requires external resistors for adjustment. | Suitable for cost-driven power supply feedback; lacks integrated trim and tighter tempco needed for metrology-grade references. | Select when budget constraints outweigh precision requirements and board space permits external resistor network. |
| LM4040CIM3-2.5 | 2.5 V fixed output, 0.5% initial tolerance (±12.5 mV), 0.5 Ω ZZ, SOT-23-3 package, no ADJ pin, 60 µA min IZ. | Better suited for space-constrained, low-current applications like microcontroller VREF inputs - not adjustable and less stable over temperature. | Choose for compact designs where ±0.5% accuracy suffices and ADJ functionality is unnecessary. |
Compared with TL431ACDR and LM4040CIM3-2.5, the LT1009CPWR uniquely combines ±0.4% initial accuracy, ±5% adjustability, and dual-cathode low-impedance design - making it optimal for applications demanding both precision and field calibration without layout changes.
Availability
LT1009CPWR is available at Aetrix Electronics and suitable for industrial data acquisition, PLC analog I/O modules, medical instrumentation, and test & measurement equipment requiring stable component supply and long-term parametric consistency.
Supply support for LT1009CPWR 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, embedded processing, and connectivity technologies, with decades of expertise in precision analog ICs and reference design.
The LT1009CPWR belongs to TI's precision voltage reference product line, engineered specifically for applications demanding high initial accuracy, low temperature drift, and system-level adjustability - including industrial automation, medical diagnostics, and metrology instrumentation.
FAQ
What is the maximum cathode current rating for LT1009CPWR?
The LT1009CPWR supports up to 10 mA cathode current under recommended operating conditions. Absolute maximum reverse current is 20 mA, but sustained operation above 10 mA may exceed thermal limits in the TSSOP package due to its 149°C/W junction-to-ambient thermal resistance. For continuous 10 mA use, ensure board-level thermal relief or derate ambient temperature accordingly.
Can LT1009CPWR replace LM136-2.5 directly in existing designs?
Yes, LT1009CPWR is explicitly designed as a terminal-for-terminal replacement for LM136-2.5 in both SOIC-8 and TSSOP-8 packages. Pinout, voltage rating, and electrical behavior match - including identical ANODE/CATHODE/ADJ assignments and compatible adjustment range. No PCB changes are required when upgrading from LM136-2.5 to LT1009CPWR.
How does the ADJ pin function in LT1009CPWR?
The ADJ pin on LT1009CPWR allows ±5% output voltage adjustment by connecting an external resistor divider between cathode and ground. With ADJ open, output is nominal 2.5 V. Pulling ADJ toward ground lowers VZ; pulling toward cathode raises it. This feature enables system-level calibration without external op-amps or trimmer potentiometers.
What is the long-term stability of LT1009CPWR over time?
LT1009CPWR exhibits 20 ppm per kilohour long-term drift at 25°C under 1 mA cathode current. This equates to approximately 175 ppm/year under continuous operation - well within requirements for industrial instrumentation and calibrated test equipment. Stability improves with lower operating current and ambient temperature.
Is LT1009CPWR suitable for automotive applications?
No, LT1009CPWR is rated for 0°C to 70°C operation (C-grade) and is not qualified for automotive AEC-Q100 stress testing. For automotive use, consider TI's AEC-Q100 qualified alternatives such as REF3025AIDBZR or TL431QDBZRQ1, which meet extended temperature and reliability requirements.
LT1009CPWR 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):
- 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
LT1009CPWR FAQ
1.How can I place an order for LT1009CPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009CPWR 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 LT1009CPWR reliable?
The price and inventory of LT1009CPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009CPWR is usually 5 days.
3.What payment methods are accepted for LT1009CPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009CPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009CPWR?
LT1009CPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009CPWR 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 LT1009CPWR?
For technical support, including LT1009CPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009CPWR requirements.
6.How does Aetrix verify that LT1009CPWR is sourced from the original manufacturer or authorized distributors?
All LT1009CPWR 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 LT1009CPWR meets industry standards.
7.What is the process for return or replacement of LT1009CPWR?
All LT1009CPWR units undergo pre-shipment inspection (PSI). If there is an issue with LT1009CPWR, 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 LT1009CPWR part is unused and in its original packaging.
Return procedure for LT1009CPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009CPWR Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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