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Texas Instruments LT1009CLPR
- Part No.:
- LT1009CLPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LT1009CLPR.pdf
- Description:
- IC VREF SHUNT 0.2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:866
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Product details
Overview
LT1009CLPR from Texas Instruments is a precision 2.5-V shunt voltage reference in TO-92 (LP) package, featuring ±5 mV initial tolerance (0.2%), 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 in 8-bit ADC/DAC circuits, power-supply monitors, and digital voltmeters.
For engineers reviewing the LT1009CLPR datasheet, LT1009CLPR pinout, LT1009CLPR application, or LT1009CLPR equivalent, key selection considerations include its TO-92 thermal resistance (140 °C/W), no-trim operation with optional adjustment, compatibility with LM136-2.5, and specified performance across 400 µA–10 mA cathode current range.
Technical Context
The LT1009CLPR operates as a two-terminal shunt reference with a third ADJ terminal enabling ±5% output voltage trimming without degrading temperature coefficient. Its internal architecture uses on-chip laser trimming to achieve tight initial tolerance and low αVZ, eliminating external trim networks in most designs.
It functions within a reverse current range of 400 µA to 10 mA, maintains stable 2.5 V output under varying load and temperature, and delivers low noise (25 nV/√Hz at 10 Hz) and low dynamic impedance (≤0.6 Ω at 1 mA) critical for high-resolution data conversion systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V to 2.505 V at 1 mA (LP package, 25°C); enables precise 2.5-V system-level biasing |
| Initial Tolerance | ±5 mV (0.2%) at 25°C; reduces calibration overhead in production test |
| Temp Coefficient | 15 ppm/°C typical (0°C to 70°C); ensures ≤0.26 mV drift over full operating range |
| Dynamic Impedance | 0.6 Ω max at 1 mA; minimizes output voltage variation under dynamic load transients |
| Adjustment Range | ±5% via ADJ pin; allows fine-tuning to compensate for system-level gain/offset errors |
| Operating Current | 400 µA to 10 mA cathode current; supports low-power sensor interfaces and high-accuracy converters |
| Long-Term Drift | 20 ppm/khr at 25°C; ensures reference stability over years of continuous operation |
Pinout & Package
LT1009CLPR is housed in a TO-92 (LP) plastic package with 3 leads, 5.34 mm maximum height, and straight or formed lead options. Thermal resistance is 140 °C/W (θJA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ANODE) | Anode connection | Connected to system ground or low-impedance return path; defines reference common point |
| 2 (CATHODE) | Cathode connection | Current-sinking node; output voltage appears between CATHODE and ANODE |
| 3 (ADJ) | Adjustment terminal | Enables ±5% reference voltage tuning via external resistor divider; open-circuit for nominal 2.5 V |
Key Features
| Feature | Design Value |
|---|---|
| On-chip laser trimming | Eliminates need for external trim potentiometers, reducing BOM count and board space |
| Terminal-for-terminal LM136-2.5 replacement | Enables drop-in upgrade in legacy designs without PCB modification |
| No adjustment required for min tempco | Guarantees specified 15 ppm/°C performance out-of-box, simplifying qualification |
| Wide cathode current range | Operates reliably from 400 µA (low-power sensors) to 10 mA (high-drive DAC references) |
| Low dynamic impedance | 0.6 Ω max ensures minimal interaction with downstream circuitry during fast load changes |
Applications
| 8-Bit Data Acquisition Systems | Power Supply Monitoring Circuits |
|---|---|
Use Scenario: Reference for 8-bit analog-to-digital converters in industrial PLC input modules. IC Role / Device Role / Timing Role: Provides stable 2.5-V reference voltage for ADC full-scale calibration. Use Value: ±5 mV initial tolerance and 15 ppm/°C tempco ensure <0.2 LSB error over 0°C–70°C operating range. |
Use Scenario: Threshold detection in 5-V rail supervisor circuits for microcontroller reset generation. IC Role / Device Role / Timing Role: Shunt reference establishing precise undervoltage lockout (UVLO) trip point. Use Value: Low dynamic impedance prevents false triggering during transient load events on the monitored rail. |
| Digital Voltmeters | Current-Loop Transmitters |
Use Scenario: Precision scaling reference in handheld DVM front-end signal conditioning. IC Role / Device Role / Timing Role: Sets measurement full-scale range for 200-mV to 2-V input amplifiers. Use Value: 20 ppm/khr long-term stability ensures calibration validity over 12-month service intervals. |
Use Scenario: Reference source in 4–20 mA transmitter DACs for process control instrumentation. IC Role / Device Role / Timing Role: Defines exact current loop scaling factor independent of supply variations. Use Value: Adjustable ±5% output compensates for op-amp offset and resistor tolerance stack-up in loop design. |
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 | Wider initial tolerance (±1%), higher tempco (30 ppm/°C), no ADJ pin | Lacks programmable adjustment; requires external trim network for high-accuracy use | Select when cost sensitivity outweighs precision requirements and board space permits trim components |
| TL431ACLP | 2.495 V nominal, ±1% initial tolerance, 50 ppm/°C tempco, adjustable via resistive divider | Higher dynamic impedance (0.2 Ω typical but not guaranteed max), wider supply range (2.5–36 V) | Choose for higher-voltage shunt regulation or where tighter cost control is needed despite reduced stability |
Compared with LM136-2.5 and TL431ACLP, the LT1009CLPR delivers superior initial accuracy and temperature stability in a fixed-pinout TO-92 package, making it optimal for metrology-grade 8-bit systems where long-term drift and thermal error must be minimized without added components.
Availability
LT1009CLPR is available at Aetrix Electronics and suitable for 8-bit data acquisition systems, power-supply monitors, and digital voltmeters requiring stable component supply with consistent parametric performance across production lots.
Supply support for LT1009CLPR 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, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The LT1009 series was designed as a precision shunt reference family targeting high-stability, low-drift applications in data conversion, instrumentation, and power management systems where accuracy and reliability are critical.
FAQ
What is the operating temperature range for the LT1009CLPR?
The LT1009CLPR is characterized for operation from 0°C to 70°C. This commercial-grade specification ensures guaranteed performance across standard industrial ambient conditions, with parameters such as reference voltage, temperature coefficient, and dynamic impedance validated within this range per the TI SLVS013N datasheet.
Can the LT1009CLPR replace the LM136-2.5 without circuit modifications?
Yes, the LT1009CLPR is explicitly designed as a terminal-for-terminal replacement for the LM136-2.5 in TO-92 packages. Its identical pinout (ANODE, CATHODE, ADJ), compatible voltage range, and improved specs allow direct substitution-eliminating the need for external trim components while enhancing accuracy and stability in the LT1009CLPR.
What is the purpose of the ADJ pin on the LT1009CLPR?
The ADJ pin on the LT1009CLPR enables ±5% adjustment of the reference voltage using an external resistor divider. When left open, the device delivers its nominal 2.5 V output; connecting ADJ to a voltage divider allows fine-tuning to correct system-level errors-without affecting the temperature coefficient or requiring recalibration of the entire circuit.
What is the minimum and maximum cathode current for stable operation of the LT1009CLPR?
The LT1009CLPR operates stably with cathode current from 400 µA to 10 mA. Below 400 µA, regulation degrades; above 10 mA, power dissipation exceeds safe limits in the TO-92 package. The 1 mA test condition used in key specs (e.g., 0.6 Ω dynamic impedance) falls well within this validated operating window.
How does the LT1009CLPR achieve its low temperature coefficient?
The LT1009CLPR achieves its 15 ppm/°C typical temperature coefficient through on-chip laser trimming of internal resistors and active elements during manufacturing. This process minimizes both initial voltage error and its variation over temperature-ensuring the LT1009CLPR meets its specified αVZ without external compensation or post-assembly adjustment.
LT1009CLPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- 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:
- ±0.2%
- 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
LT1009CLPR FAQ
1.How can I place an order for LT1009CLPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009CLPR 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 LT1009CLPR reliable?
The price and inventory of LT1009CLPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009CLPR is usually 5 days.
3.What payment methods are accepted for LT1009CLPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009CLPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009CLPR?
LT1009CLPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009CLPR 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 LT1009CLPR?
For technical support, including LT1009CLPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009CLPR requirements.
6.How does Aetrix verify that LT1009CLPR is sourced from the original manufacturer or authorized distributors?
All LT1009CLPR 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 LT1009CLPR meets industry standards.
7.What is the process for return or replacement of LT1009CLPR?
All LT1009CLPR units undergo pre-shipment inspection (PSI). If there is an issue with LT1009CLPR, 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 LT1009CLPR part is unused and in its original packaging.
Return procedure for LT1009CLPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009CLPR Tags
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