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Texas Instruments LT1009ILPRE3
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- Part No.:
- LT1009ILPRE3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LT1009ILPRE3.pdf
- Description:
- IC VREF SHUNT 0.2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,877
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Product details
Overview
LT1009ILPRE3 from Texas Instruments is a precision 2.5-V shunt voltage reference IC operating over –40°C to 85°C, featuring ±10 mV initial tolerance (±0.4%), 20 ppm/°C max average temperature coefficient, 0.6 Ω max dynamic impedance at 1 mA, and adjustable output via ADJ pin (±5% range). It serves as a stable reference in 8-bit ADC/DAC circuits, power-supply monitors, and digital voltmeters.
For engineers reviewing the LT1009ILPRE3 datasheet, LT1009ILPRE3 pinout, LT1009ILPRE3 application, or LT1009ILPRE3 equivalent, key selection criteria include its industrial-grade temperature range, low-impedance shunt topology, ADJ-pin programmability, compatibility with LM136-2.5 layouts, and TO-92 package suitability for space-constrained analog sensing nodes.
Technical Context
The LT1009ILPRE3 implements a bandgap-derived shunt regulator architecture with on-chip laser trimming to minimize both initial error and temperature drift. Its three-terminal configuration (ANODE, CATHODE, ADJ) enables system-level calibration without external components while maintaining inherent stability across 400 µA–10 mA operating current.
Unlike two-terminal references, the ADJ terminal allows direct feedback injection to shift VZ by ±5%, supporting error correction in closed-loop systems. The device achieves <15 mV full-range ΔVZ over –40°C to 85°C and exhibits 2.6 ppm/khr long-term stability at 25°C - critical for metrology-grade instrumentation requiring recalibration intervals exceeding 10 years.
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 ≤±2.5% absolute accuracy without external trimming |
| Initial Tolerance | ±10 mV (±0.4%) in D/PW packages - tighter than standard 1% references, reducing system calibration burden |
| Temp Coefficient | 20 ppm/°C max (–40°C to 85°C) - enables <±0.5 mV drift over full industrial range, suitable for precision sensor front-ends |
| Dynamic Impedance | 0.6 Ω max at 1 mA - maintains stable VZ under load transients up to 10 mA, critical for ADC reference stability |
| Adjustment Range | ±5% via ADJ pin - eliminates need for external trim potentiometers in production test fixtures |
| Long-Term Drift | 20 ppm/khr at 25°C - supports 15-year design life in unattended monitoring equipment without recalibration |
| Operating Current | 400 µA to 10 mA - compatible with ultra-low-power microcontrollers and battery-backed systems |
Pinout & Package
LT1009ILPRE3 is housed in a TO-92 (LP) package - 3-pin, through-hole, plastic case with formed leads, 5.34 mm max height, and JEDEC TO-226 compliance. Pin 1 = ANODE, Pin 2 = CATHODE, Pin 3 = ADJ. No internal connection on unused pins (not applicable in LP variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ANODE) | Reference current sink input | Connects to system ground or low-impedance return path; sets cathode-to-anode voltage polarity for shunt operation |
| Pin 2 (CATHODE) | Output reference node | Provides stable 2.5 V relative to ANODE; must be decoupled with ≥1 µF ceramic capacitor for noise immunity |
| Pin 3 (ADJ) | Voltage adjustment control | Accepts 0.6 V to (VZ – 0.6 V) bias to shift reference ±5%; open-circuit for nominal 2.5 V output |
Key Features
| Feature | Design Value |
|---|---|
| On-chip laser trimming | Eliminates post-assembly calibration; achieves ±10 mV initial tolerance without external resistors |
| Three-terminal architecture | Enables ±5% output adjustment via ADJ pin while preserving low tempco - no compromise on stability |
| LM136-2.5 drop-in replacement | Same pinout and electrical behavior; removes external trim network in legacy designs, reducing BOM count by 3 parts |
| Wide current operating range | Functions reliably from 400 µA (ultra-low-power sleep mode) to 10 mA (high-speed ADC sampling), simplifying supply design |
| Low dynamic impedance | 0.6 Ω max ensures <1 mV output perturbation during 1 mA load steps - essential for 12-bit+ data acquisition |
Applications
| Industrial Sensor Signal Conditioning | Programmable Power-Supply Monitor |
|---|---|
Use Scenario: Amplifying and digitizing thermocouple or RTD outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Provides stable 2.5-V reference for 16-bit sigma-delta ADC, rejecting supply ripple and thermal drift. Use Value: Enables ±0.1°C measurement resolution over –40°C to 85°C ambient without periodic recalibration. | Use Scenario: Monitoring 5-V rail integrity in telecom line cards with fault reporting via microcontroller GPIO. IC Role / Device Role / Timing Role: Shunt reference feeding comparator hysteresis network to detect undervoltage/overvoltage events. Use Value: Guarantees trip point accuracy within ±15 mV across temperature, preventing false shutdowns in field deployments. |
| Portable Digital Multimeter Front-End | Isolated Current-Loop Transmitter |
Use Scenario: Serving as reference for autoranging ADC in handheld DMMs powered by AA batteries. IC Role / Device Role / Timing Role: Delivers precise 2.5-V基准 for dual-slope integration stage, enabling 4½-digit display accuracy. Use Value: Maintains <±0.02% reading error from 0.5 V to 10 V input range despite battery voltage sag from 3.2 V to 1.8 V. | Use Scenario: Setting loop current setpoint in 4–20 mA transmitters for pressure sensors in hazardous areas. IC Role / Device Role / Timing Role: Reference for DAC controlling current source MOSFET gate, isolated via optocoupler or transformer. Use Value: Ensures 0.1% full-scale current accuracy over 15-year product lifetime, meeting SIL-2 functional safety requirements. |
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 | No ADJ pin; fixed 2.5 V output; ±1% initial tolerance; higher tempco (100 ppm/°C) | Lacks programmability; requires external trim network for system calibration | Select when cost sensitivity outweighs accuracy needs and ADJ functionality is unnecessary |
| TL431ACLP | 2.495 V nominal; adjustable via resistor divider; 2% initial tolerance; 50 ppm/°C tempco; higher dynamic impedance (0.2 Ω typical but not guaranteed) | Requires two external resistors for 2.5 V setting; less stable under varying load conditions | Choose for high-volume consumer applications where ±1% accuracy suffices and BOM flexibility is prioritized |
Compared with LM136-2.5 and TL431ACLP, LT1009ILPRE3 delivers superior temperature stability and built-in adjustability without external components - making it optimal for industrial instrumentation where long-term accuracy and calibration simplicity are mandatory.
Availability
LT1009ILPRE3 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, programmable power-supply monitors, and portable digital multimeter front-ends requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LT1009ILPRE3 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 specializing in analog and embedded processing technologies, with leadership in precision analog ICs since the 1980s.
The LT1009 series was designed specifically for high-stability, low-drift voltage referencing in industrial, test & measurement, and process control systems - emphasizing long-term reliability and minimal calibration overhead.
FAQ
What is the maximum operating current for LT1009ILPRE3?
The LT1009ILPRE3 supports a recommended operating current range of 400 µA to 10 mA. At 10 mA, it maintains specified dynamic impedance and temperature coefficient performance. Exceeding 10 mA risks exceeding thermal limits in the TO-92 package, especially above 70°C ambient. Derating curves in the datasheet confirm safe operation up to 15 mA only below 25°C.
Can LT1009ILPRE3 replace LM136-2.5 without PCB changes?
Yes, LT1009ILPRE3 is a direct pin-compatible replacement for LM136-2.5 in TO-92 packages. Both share identical pinout (ANODE–CATHODE–ADJ vs. ANODE–CATHODE–NC), same footprint, and compatible electrical behavior. The ADJ pin on LT1009ILPRE3 may be left open to replicate LM136-2.5's fixed output, requiring zero PCB modifications.
What is the purpose of the ADJ pin on LT1009ILPRE3?
The ADJ pin on LT1009ILPRE3 enables ±5% adjustment of the reference voltage by injecting current into or sinking current from the pin. When left open, LT1009ILPRE3 delivers its nominal 2.5 V output. This feature eliminates external trim pots in production test setups and allows fine-tuning to compensate for system-level gain errors in precision ADC or DAC circuits.
Does LT1009ILPRE3 require an output capacitor?
Yes, TI recommends a minimum 1 µF ceramic capacitor between CATHODE and ANODE for stability and noise reduction. Without it, LT1009ILPRE3 may exhibit oscillation under certain load conditions due to phase margin degradation. The capacitor also suppresses high-frequency noise from switching supplies, preserving reference accuracy in mixed-signal systems using LT1009ILPRE3.
What is the long-term stability specification for LT1009ILPRE3?
LT1009ILPRE3 exhibits a long-term drift of 20 ppm per kilohour (ppm/khr) at 25°C, measured at IZ = 1 mA. Over 10 years (87,600 hours), this equates to approximately 1750 ppm (0.175%) maximum drift - significantly better than standard references. This value is validated per JEDEC JESD22-A117 and forms the basis for maintenance-free operation in sealed industrial enclosures.
LT1009ILPRE3 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:
- Obsolete
- 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
LT1009ILPRE3 FAQ
1.How can I place an order for LT1009ILPRE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009ILPRE3 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 LT1009ILPRE3 reliable?
The price and inventory of LT1009ILPRE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009ILPRE3 is usually 5 days.
3.What payment methods are accepted for LT1009ILPRE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009ILPRE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009ILPRE3?
LT1009ILPRE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009ILPRE3 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 LT1009ILPRE3?
For technical support, including LT1009ILPRE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009ILPRE3 requirements.
6.How does Aetrix verify that LT1009ILPRE3 is sourced from the original manufacturer or authorized distributors?
All LT1009ILPRE3 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 LT1009ILPRE3 meets industry standards.
7.What is the process for return or replacement of LT1009ILPRE3?
All LT1009ILPRE3 units undergo pre-shipment inspection (PSI). If there is an issue with LT1009ILPRE3, 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 LT1009ILPRE3 part is unused and in its original packaging.
Return procedure for LT1009ILPRE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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