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Texas Instruments LT1009ILPR
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- Part No.:
- LT1009ILPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LT1009ILPR.pdf
- Description:
- IC VREF SHUNT 0.2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,819
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Product details
Overview
LT1009ILPR from Texas Instruments is a precision 2.5-V shunt voltage reference IC designed for high-stability analog and mixed-signal systems. It delivers ±10 mV initial tolerance (±0.4%), 20–35 ppm/°C temperature coefficient over –40°C to 85°C, 1.4 Ω dynamic impedance, and ±5% adjustable output via ADJ pin - used in 8-bit ADC/DAC references, power-supply monitors, and digital voltmeters.
For engineers reviewing the LT1009ILPR datasheet, LT1009ILPR pinout, LT1009ILPR application, or LT1009ILPR equivalent, key selection criteria include its TO-92 LP package with 3-terminal shunt topology, guaranteed operation across industrial temperature range, low long-term drift (20 ppm/khr), and direct interchangeability with LM136-2.5 in many designs.
Technical Context
The LT1009ILPR operates as a two-terminal (ANODE/CATHODE) shunt reference with a third ADJ terminal enabling ±5% output adjustment without degrading temperature coefficient. Its on-chip trimming achieves tight initial voltage accuracy and minimizes αVZ across –40°C to 85°C.
It requires no external components for basic 2.5-V operation, supports 400 µA to 10 mA cathode current, and maintains stable regulation under varying load and supply conditions - unlike series references, it sinks current to regulate, making it ideal for low-power, high-impedance bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.475 V to 2.525 V at IZ = 1 mA, full –40°C to 85°C range - ensures system-level accuracy without calibration. |
| Initial Tolerance | ±10 mV (±0.4%) in D/PW packages; ±5 mV in LP - LT1009ILPR uses TO-92 LP, so ±5 mV applies. |
| Temp Coefficient αVZ | 20–35 ppm/°C (–40°C to 85°C) - enables stable reference in industrial environments without oven control. |
| Dynamic Impedance ZZ | 1.4 Ω max at IZ = 1 mA - suppresses noise coupling and improves PSRR in sensitive measurement circuits. |
| Adjustment Range | ±5% via ADJ pin - allows fine-tuning to compensate for PCB trace resistance or system gain errors. |
| Long-Term Drift | 20 ppm/khr at 25°C - supports >10-year reliability in metering and instrumentation applications. |
| Operating Current | 400 µA to 10 mA cathode current - accommodates ultra-low-power sensor interfaces and high-current DAC buffers. |
Pinout & Package
LT1009ILPR is housed in a TO-92 (LP) package - 3-pin, through-hole, straight or formed leads, 5.34 mm max height, JEDEC TO-226 compliant. Pin 1 = ANODE, Pin 2 = CATHODE, Pin 3 = ADJ. Pins 1 and 3 have internal connection; Pin 2 is the regulation node.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ANODE) | Anode of internal shunt regulator | Connected to system ground or low-impedance return; defines current sink path for regulation. |
| Pin 2 (CATHODE) | Cathode / output node | Provides regulated 2.5 V; must be decoupled locally to maintain stability and low noise. |
| Pin 3 (ADJ) | Adjustment terminal | Enables ±5% output tuning via external resistor divider; open-circuit for nominal 2.5 V operation. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip laser trimming | Eliminates need for external trim potentiometers and reduces board space in precision references. |
| No external capacitor required | Stable operation with only 100 nF bypass - simplifies layout and avoids phase-margin risks in feedback loops. |
| Direct LM136-2.5 replacement | Same pinout and electrical behavior in TO-92 LP - enables drop-in upgrade without PCB revision. |
| Low forward voltage (0.4 V) | Reduces minimum headroom requirement when used in low-voltage monitoring circuits (e.g., 3.3-V rail). |
| Wide cathode current range | Supports both microamp-level biasing (e.g., op-amp input stages) and 10-mA DAC reference loads. |
Applications
| Industrial Power-Supply Monitor | 8-Bit Data Converter Reference |
|---|---|
|
Use Scenario: Monitoring 5-V DC rails in PLC I/O modules for brownout detection and fault logging. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5-V threshold for comparator input. Use Value: ±5 mV initial tolerance and 35 ppm/°C TC ensure <±0.5% total error over full industrial temperature range. |
Use Scenario: Supplying reference voltage to 8-bit SAR ADCs in battery-powered data loggers. IC Role / Device Role / Timing Role: Precision voltage source defining LSB step size (≈9.8 mV) for accurate digitization. Use Value: 1.4 Ω dynamic impedance prevents code-dependent reference droop during conversion sampling. |
| Digital Multimeter Front-End | Current-Loop Transmitter Calibration |
|
Use Scenario: High-impedance voltage reference in autoranging DMM input stages with 0.1% accuracy class. IC Role / Device Role / Timing Role: Stable 2.5-V基准 for scaling amplifier gain and offset correction. Use Value: 20 ppm/khr long-term drift meets metrology-grade calibration interval requirements (≥1 year). |
Use Scenario: Setting precise 4–20 mA loop current via voltage-to-current converter in process transmitters. IC Role / Device Role / Timing Role: Regulated reference driving precision current-sense resistor and op-amp feedback network. Use Value: ±5% ADJ pin tunability compensates for resistor tolerance stack-up and eliminates factory trim steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM136-2.5 | Same 2.5-V nominal output, but ±1% initial tolerance and higher 100 ppm/°C TC; requires external trim for precision use. | Lacks ADJ pin - no field-adjustable output; limited to fixed-reference roles where tighter spec not required. | Choose LM136-2.5 only for cost-sensitive, non-critical applications where ±1% accuracy suffices. |
| TL431ACLP | Programmable 2.495 V reference with 0.5% initial tolerance and 50 ppm/°C TC; higher 0.22 Ω ZZ but wider IK range (1–100 mA). | Requires two external resistors for 2.5-V setting; less suitable for space-constrained layouts than 3-pin LT1009ILPR. | Prefer TL431ACLP when higher cathode current (>10 mA) or programmability beyond ±5% is needed. |
Compared with LM136-2.5 and TL431ACLP, the LT1009ILPR offers superior initial accuracy and temperature stability in a simpler 3-pin TO-92 package - ideal for industrial-grade instruments where long-term repeatability and minimal BOM count are critical.
Availability
LT1009ILPR is available at Aetrix Electronics and suitable for industrial power-supply monitors, 8-bit data converter references, and digital multimeter front-ends requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LT1009ILPR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and industrial-grade performance.
The LT1009 product line was developed specifically for high-accuracy, low-drift shunt voltage references in test equipment, process control, and precision measurement - prioritizing long-term stability and ease of integration over feature complexity.
FAQ
What is the operating temperature range of the LT1009ILPR?
The LT1009ILPR is characterized for operation from –40°C to +85°C, meeting industrial temperature grade requirements. This range is confirmed in the TI datasheet's Recommended Operating Conditions table and applies specifically to the "I" grade variant, including LT1009ILPR in TO-92 LP packaging.
Does the LT1009ILPR require an external capacitor for stability?
No, the LT1009ILPR is internally compensated and remains stable without an external capacitor. A 100-nF ceramic bypass capacitor at the CATHODE pin is recommended for noise reduction but is not required for loop stability - unlike many bandgap references, it has no minimum ESR or capacitance constraint.
Can the LT1009ILPR replace the LM136-2.5 directly on a PCB?
Yes, the LT1009ILPR in TO-92 LP package is pin-compatible and electrically interchangeable with the LM136-2.5 in the same package. Both share identical pin 1 (ANODE), pin 2 (CATHODE), pin 3 (ADJ/GND) assignments and require no layout changes - TI explicitly states this in the datasheet's Features section.
What is the maximum cathode current rating for the LT1009ILPR?
The absolute maximum cathode current for the LT1009ILPR is 20 mA, per the Absolute Maximum Ratings table. However, the recommended operating range is 400 µA to 10 mA - operating above 10 mA increases self-heating and may degrade temperature coefficient performance unless thermal design accounts for it.
How does the ADJ pin function in the LT1009ILPR?
The ADJ pin on the LT1009ILPR allows ±5% adjustment of the output voltage by connecting an external resistor divider between CATHODE and ground. When left open, the device delivers nominal 2.5 V; applying 0.6 V to VZ − 0.6 V at ADJ shifts output linearly within the ±5% window - all while preserving the original temperature coefficient.
LT1009ILPR 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:
- 35ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 400 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LT1009ILPR FAQ
1.How can I place an order for LT1009ILPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009ILPR 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 LT1009ILPR reliable?
The price and inventory of LT1009ILPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009ILPR is usually 5 days.
3.What payment methods are accepted for LT1009ILPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009ILPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009ILPR?
LT1009ILPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009ILPR 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 LT1009ILPR?
For technical support, including LT1009ILPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009ILPR requirements.
6.How does Aetrix verify that LT1009ILPR is sourced from the original manufacturer or authorized distributors?
All LT1009ILPR 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 LT1009ILPR meets industry standards.
7.What is the process for return or replacement of LT1009ILPR?
All LT1009ILPR units undergo pre-shipment inspection (PSI). If there is an issue with LT1009ILPR, 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 LT1009ILPR part is unused and in its original packaging.
Return procedure for LT1009ILPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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