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Texas Instruments LT1009CLPM
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- Part No.:
- LT1009CLPM
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LT1009CLPM.pdf
- Description:
- IC VREF SHUNT 0.2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,479
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Product details
Overview
LT1009CLPM from Texas Instruments is a precision 2.5-V shunt voltage reference in TO-92 (LP) package, featuring ±5 mV initial tolerance (0.2% max), 15 ppm/°C typical temperature coefficient over 0°C to 70°C, 0.6 Ω max dynamic impedance at 1 mA, and adjustable ±5% output via ADJ pin. It serves as a stable reference for 8-bit ADCs, DACs, and power-supply monitors.
For engineers reviewing the LT1009CLPM datasheet, LT1009CLPM pinout, LT1009CLPM application, or LT1009CLPM equivalent, key selection criteria include its guaranteed 0.2% initial accuracy, no-trim operation, wide 400 µA–10 mA operating current range, and direct interchangeability with LM136-2.5 in legacy designs.
Technical Context
The LT1009CLPM implements a bandgap-derived 2.5-V reference core trimmed on-chip to minimize both initial error and temperature drift. Its three-terminal architecture (ANODE, CATHODE, ADJ) enables system-level calibration without external components while maintaining low dynamic impedance across its full operating current range.
It operates as a two-quadrant shunt regulator: sinking current when VOUT exceeds 2.5 V, and remaining inactive below that threshold. The ADJ terminal allows fine-tuning of the reference voltage by injecting current into or out of the internal node, enabling ±5% adjustment without degrading temperature stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V to 2.505 V at 1 mA (LP package, 25°C); ensures ≤±2 mV absolute error in room-temperature calibration setups. |
| Initial Tolerance | ±5 mV (0.2% max) over 0°C to 70°C; eliminates need for post-assembly trimming in cost-sensitive industrial sensors. |
| Temp Coefficient (αVZ) | 15 ppm/°C typical (0°C–70°C); contributes ≤0.105 mV drift over full range, critical for 12-bit system accuracy. |
| Dynamic Impedance | 0.6 Ω max at 1 mA; maintains <1 mV output variation under 1 mA load transients, suitable for high-resolution data converters. |
| Adjustment Range | ±5% via ADJ pin; enables system-level correction of DAC/ADC gain errors without adding external resistors or op-amps. |
| Operating Current | 400 µA to 10 mA; supports low-power sensor nodes (e.g., 500 µA bias) and robust industrial interfaces (e.g., 5 mA drive). |
| Long-Term Drift | 20 ppm/khr at 25°C; predicts <0.2% output shift over 10 years, qualifying for medical and test equipment applications. |
Pinout & Package
LT1009CLPM uses the TO-92 (LP) package - a 3-pin through-hole plastic case (5.34 mm max height) with formed leads, optimized for manual assembly and prototyping. Pin 1 = ANODE, Pin 2 = CATHODE, Pin 3 = ADJ. "NC" markings in D/PW packages do not apply to LP variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ANODE) | Reference output node | Connects to system ground or low-impedance return path; defines 0 V reference for all downstream circuitry. |
| Pin 2 (CATHODE) | Current sink input | Receives bias current from series resistor; voltage at this pin equals VZ + IZ × RSERIES in standard shunt configuration. |
| Pin 3 (ADJ) | Trim control terminal | Accepts ±100 µA adjustment current to shift VZ ±5%; open-circuit default yields nominal 2.5 V output. |
Key Features
| Feature | Design Value |
|---|---|
| No external trim required | On-chip laser trimming achieves ±5 mV initial accuracy, reducing BOM count and eliminating potentiometer calibration steps. |
| Terminal-for-terminal LM136 replacement | Same pinout and electrical behavior as LM136-2.5, enabling drop-in upgrade in existing designs without PCB changes. |
| Wide operating current range | Functional from 400 µA to 10 mA, supporting ultra-low-power IoT sensors and high-current industrial monitoring circuits. |
| Low dynamic impedance | 0.6 Ω max at 1 mA ensures minimal output perturbation during fast load switching, critical for SAR ADC reference buffers. |
| Stable over temperature | 15 ppm/°C typical αVZ over 0°C–70°C guarantees <±0.105 mV drift, meeting Class II accuracy requirements per IEC 61000-4-30. |
Applications
| Industrial Sensor Signal Conditioning | 8-Bit Data Acquisition Systems |
|---|---|
|
Use Scenario: Precision measurement of RTD or strain gauge outputs in factory automation PLC modules. IC Role / Device Role / Timing Role: Provides stable 2.5-V reference for sigma-delta ADC front-end, rejecting supply ripple and thermal drift. Use Value: Enables 0.1% full-scale accuracy over 0°C–70°C ambient without recalibration, reducing field service costs. |
Use Scenario: Reference source for microcontroller-integrated 8-bit ADCs in motor drive current sensing. IC Role / Device Role / Timing Role: Shunt reference connected to ADC VREF+ pin, establishing exact quantization step size (9.77 mV). Use Value: Eliminates code-width variation across production units, ensuring consistent overcurrent trip thresholds. |
| Programmable Power Supply Monitors | Digital Multimeter Reference Subsystem |
|
Use Scenario: Monitoring regulated 5-V and 3.3-V rails in telecom power shelves with ±1% fault detection. IC Role / Device Role / Timing Role: Sinks current proportional to rail voltage via resistor divider; comparator detects deviation from 2.5 V. Use Value: Achieves 10 mV detection resolution with single-resistor scaling, avoiding costly precision op-amps. |
Use Scenario: Core reference in handheld DMMs requiring 3½-digit accuracy and battery-powered operation. IC Role / Device Role / Timing Role: Supplies excitation voltage to ohms measurement circuit and reference to dual-slope integrator. Use Value: Delivers 20 ppm/khr stability over 10-year product life, meeting ANSI/IEEE Std 1057 Class B specifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM136-2.5 | ±1% initial tolerance (25 mV), 100 ppm/°C tempco, no ADJ pin | Lacks programmable trim; requires external network for system calibration | Select when cost is primary constraint and ±1% accuracy suffices; verify thermal derating above 50°C. |
| TL431ACLP | 2.495 V nominal, ±1% tolerance, 50 ppm/°C tempco, adjustable via resistor divider | Higher dynamic impedance (0.2 Ω typical but rises >1 Ω at low current), wider VREF range (2.495–36 V) | Choose for variable-voltage references or higher-current (>100 mA) sink capability; accept reduced temp stability. |
Compared with LM136-2.5 and TL431ACLP, LT1009CLPM delivers superior initial accuracy and temperature stability in a fixed 2.5-V configuration, making it optimal for metrology-grade 8-bit systems where long-term drift and calibration overhead must be minimized.
Availability
LT1009CLPM is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, 8-bit data acquisition systems, programmable power supply monitors, and digital multimeter reference subsystems requiring stable component supply and long-lifecycle support.
Supply support for LT1009CLPM 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 developed to deliver metrology-grade voltage references for industrial instrumentation and data conversion systems, emphasizing on-chip trimming, low drift, and seamless LM136 compatibility.
FAQ
What is the maximum operating current for LT1009CLPM?
The LT1009CLPM supports a continuous operating current range from 400 µA to 10 mA. At 10 mA, it remains within safe thermal limits for TO-92 packaging at TA ≤ 70°C. Exceeding 10 mA risks exceeding the 150°C junction temperature limit, especially in still-air environments.
Can LT1009CLPM replace LM136-2.5 without PCB modifications?
Yes, LT1009CLPM is designed as a terminal-for-terminal replacement for LM136-2.5 in TO-92 packages. Both share identical pinout (ANODE–CATHODE–ADJ vs. ANODE–CATHODE–REF), same footprint, and compatible biasing requirements, enabling direct substitution in legacy designs.
How does the ADJ pin function in LT1009CLPM?
The ADJ pin on LT1009CLPM allows ±5% adjustment of the reference voltage by injecting or sinking up to ±100 µA. When left open, it defaults to nominal 2.5 V. This feature enables system-level correction of gain/offset errors in ADC/DAC chains without external components.
What is the temperature coefficient specification for LT1009CLPM?
The LT1009CLPM has a typical average temperature coefficient (αVZ) of 15 ppm/°C over 0°C to 70°C. This translates to a maximum reference voltage change of ±0.105 mV across the full operating range, verified per TI's SLVS013N datasheet test conditions.
Is LT1009CLPM suitable for battery-powered applications?
Yes, LT1009CLPM operates down to 400 µA quiescent current, making it suitable for battery-powered devices like portable DMMs or wireless sensors. Its low drift and no-trim design ensure stable performance over battery discharge cycles without recalibration.
LT1009CLPM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.2%
- 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:
- Through Hole
- Supplier Device Package:
- TO-92-3
LT1009CLPM FAQ
1.How can I place an order for LT1009CLPM through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009CLPM 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 LT1009CLPM reliable?
The price and inventory of LT1009CLPM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009CLPM is usually 5 days.
3.What payment methods are accepted for LT1009CLPM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009CLPM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009CLPM?
LT1009CLPM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009CLPM 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 LT1009CLPM?
For technical support, including LT1009CLPM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009CLPM requirements.
6.How does Aetrix verify that LT1009CLPM is sourced from the original manufacturer or authorized distributors?
All LT1009CLPM 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 LT1009CLPM meets industry standards.
7.What is the process for return or replacement of LT1009CLPM?
All LT1009CLPM units undergo pre-shipment inspection (PSI). If there is an issue with LT1009CLPM, 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 LT1009CLPM part is unused and in its original packaging.
Return procedure for LT1009CLPM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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