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Texas Instruments LT1009CLPRE3
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- Part No.:
- LT1009CLPRE3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LT1009CLPRE3.pdf
- Description:
- IC VREF SHUNT 0.2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,166
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Product details
Overview
LT1009CLPRE3 from Texas Instruments is a precision 2.5-V shunt voltage reference IC in TO-92 (LP) package, featuring ±0.2% initial tolerance (±5 mV), 15 ppm/°C max average temperature coefficient over 0°C to 70°C, and 0.6 Ω max dynamic impedance at 1 mA. It operates as a three-terminal adjustable reference with ANODE, CATHODE, and ADJ pins, used in ADC/DAC references, power-supply monitors, and digital voltmeters.
For engineers reviewing the LT1009CLPRE3 datasheet, LT1009CLPRE3 pinout, LT1009CLPRE3 application, or LT1009CLPRE3 equivalent, this page delivers verified electrical specs, terminal roles, thermal and stability data, real-world use cases, and two validated alternative parts for system-level design and sourcing decisions.
Technical Context
The LT1009CLPRE3 implements a bandgap-based shunt reference architecture with on-chip laser trimming to achieve tight initial voltage accuracy and minimized αVZ. Its ADJ terminal enables ±5% output adjustment without degrading temperature coefficient, supporting calibration of system-level errors.
It functions within a wide reverse current range (400 µA to 10 mA), maintains low long-term drift (20 ppm/khr), and delivers stable 2.5 V output across its specified operating temperature range (0°C to 70°C). Dynamic impedance remains ≤0.6 Ω at 1 mA, ensuring minimal load-induced voltage variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V nominal; ±5 mV max initial tolerance (0.2%) ensures high-accuracy system calibration without external trimming. |
| Temperature Coefficient | 15 ppm/°C max (0°C to 70°C); guarantees ≤0.26 mV drift over full industrial range, critical for precision measurement. |
| Dynamic Impedance | 0.6 Ω max at IZ = 1 mA; minimizes output voltage shift under varying load currents in feedback or sensing circuits. |
| Adjustment Range | ±5% via ADJ pin; allows fine-tuning to compensate for PCB trace resistance, op-amp input offset, or sensor gain errors. |
| Operating Current Range | 400 µA to 10 mA; supports low-power sensor interfaces and high-current reference buffering without external components. |
| Long-Term Drift | 20 ppm/khr at 25°C; ensures stable reference performance over years in deployed instrumentation or control systems. |
Pinout & Package
LT1009CLPRE3 uses the TO-92 (LP) package - a 3-pin through-hole plastic case with formed leads, 5.34 mm max height, and JEDEC TO-226 compliant outline. 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 |
|---|---|---|
| ANODE (Pin 1) | Reference output node | Connected to system ground or low-impedance return path; sets cathode-to-anode voltage polarity for shunt operation. |
| CATHODE (Pin 2) | Input/regulated node | Receives unregulated supply; sinks current to maintain 2.5 V between cathode and anode terminals. |
| ADJ (Pin 3) | Voltage trim control | Accepts external resistor divider to adjust output ±5%; open-circuit default yields nominal 2.5 V with zero added error. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip laser trimming | Eliminates need for external potentiometers or calibration resistors while achieving ±0.2% initial accuracy. |
| Three-terminal adjustability | ADJ pin enables system-level error correction without altering core reference stability or temperature behavior. |
| Wide operating current range | Supports direct interface with microcontroller ADCs (low IZ) and op-amp buffers (high IZ) using same part. |
| Low dynamic impedance | 0.6 Ω ensures <1 mV output shift when load current changes by 1 mA - essential for ratiometric sensor excitation. |
| Direct LM136-2.5 replacement | Pin-compatible and functionally identical in LP package; enables drop-in upgrade with improved tempco and tolerance. |
Applications
| High-Accuracy Data Acquisition | Industrial Power-Supply Monitoring |
|---|---|
|
Use Scenario: 12-bit SAR ADC in programmable logic controller (PLC) analog input module requiring stable reference for ±0.1% total measurement uncertainty. IC Role / Device Role / Timing Role: Shunt reference providing ratiometric excitation for bridge sensors and precise scaling of ADC full-scale range. Use Value: 15 ppm/°C tempco and 20 ppm/khr long-term drift ensure calibration validity over 5+ years in factory-floor environments. |
Use Scenario: Overvoltage protection circuit in 24-V industrial DC power rail monitoring system with watchdog timer reset logic. IC Role / Device Role / Timing Role: Precision threshold detector reference for comparator-based fault detection at 2.5 V × (R1+R2)/R2 = 27.5 V. Use Value: ±5 mV initial tolerance eliminates need for post-assembly trimming, reducing test time and BOM count. |
| Digital Multimeter Reference | Current-Loop Transmitter Calibration |
|
Use Scenario: Autoranging handheld DMM requiring stable 2.5-V reference across 4½-digit display resolution and multiple input ranges. IC Role / Device Role / Timing Role: Primary voltage standard for internal DACs, integrator ramps, and auto-zero amplifiers. Use Value: 0.6 Ω dynamic impedance prevents reading instability during range switching transients and battery voltage sag. |
Use Scenario: 4–20 mA transmitter in process automation where loop current accuracy must hold ±0.05% over ambient temperature swings. IC Role / Device Role / Timing Role: Reference for voltage-to-current conversion stage (e.g., XTR115) and DAC feedback path. Use Value: ±5% ADJ capability compensates for op-amp input bias current mismatch and PCB copper resistance in field-deployed units. |
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/NOPB | Same 2.5 V nominal, but ±1% initial tolerance (25 mV), 100 ppm/°C max tempco, no ADJ pin. | Lacks trim capability; requires external network for accuracy; higher drift limits long-term calibration intervals. | Select when cost sensitivity outweighs precision needs and board space permits external trim components. |
| TL431CDBZR | 2.495 V nominal, ±1% tolerance, 50 ppm/°C tempco, adjustable via two-resistor divider (no dedicated ADJ pin). | Higher minimum cathode current (1 mA), less stable at low IZ; not suitable for sub-500 µA applications. | Choose for higher-volume designs where SOT-23 footprint and integrated error amplifier simplify feedback loops. |
Compared with LM136-2.5/NOPB, LT1009CLPRE3 delivers 5× tighter initial tolerance and 6.7× lower tempco without added components; versus TL431CDBZR, it offers superior low-current stability and dedicated ADJ functionality for predictable ±5% tuning.
Availability
LT1009CLPRE3 is available at Aetrix Electronics and suitable for industrial instrumentation, PLC analog modules, and portable test equipment requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LT1009CLPRE3 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 high-reliability components for industrial, automotive, and communications markets.
The LT1009 series was designed as a precision shunt reference family targeting applications demanding high initial accuracy, low temperature drift, and simple three-terminal implementation - especially where LM136 replacement or system-level trimming is required.
FAQ
What is the maximum operating temperature range for the LT1009CLPRE3?
The LT1009CLPRE3 is characterized for operation from 0°C to 70°C. This industrial-grade temperature range is explicitly defined in the TI datasheet for the 'C' suffix variant, and applies to all package options including the LP (TO-92) version. Operation outside this range may result in parametric degradation or reliability risk.
Does the LT1009CLPRE3 require external components to achieve its specified 0.2% initial tolerance?
No, the LT1009CLPRE3 does not require external components to achieve its ±0.2% initial tolerance. This accuracy is achieved via on-chip laser trimming during manufacturing, as confirmed in the datasheet's DESCRIPTION section and ELECTRICAL CHARACTERISTICS table for the LP package (±5 mV at 25°C).
Can the LT1009CLPRE3 be used as a direct replacement for the LM136-2.5 in existing designs?
Yes, the LT1009CLPRE3 is directly interchangeable with the LM136-2.5 in TO-92 (LP) packages. The pinout, voltage rating, and functional behavior match identically, and the datasheet explicitly states "Directly Interchangeable With LM136". No PCB changes or schematic modifications are needed.
What is the purpose of the ADJ pin on the LT1009CLPRE3, and how is it used?
The ADJ pin on the LT1009CLPRE3 enables ±5% output voltage adjustment via an external resistor divider. When connected between cathode and ground, it shifts the reference voltage while preserving temperature coefficient and stability - allowing system-level calibration without affecting core reference performance.
What is the dynamic impedance specification for the LT1009CLPRE3, and why does it matter in circuit design?
The LT1009CLPRE3 has a maximum dynamic impedance of 0.6 Ω at IZ = 1 mA. This low value ensures minimal output voltage variation (<0.6 mV per 1 mA load change), which is critical in precision applications like ADC references or current-source control where load transients must not perturb the reference node.
LT1009CLPRE3 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:
- 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
LT1009CLPRE3 FAQ
1.How can I place an order for LT1009CLPRE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009CLPRE3 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 LT1009CLPRE3 reliable?
The price and inventory of LT1009CLPRE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009CLPRE3 is usually 5 days.
3.What payment methods are accepted for LT1009CLPRE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009CLPRE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009CLPRE3?
LT1009CLPRE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009CLPRE3 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 LT1009CLPRE3?
For technical support, including LT1009CLPRE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009CLPRE3 requirements.
6.How does Aetrix verify that LT1009CLPRE3 is sourced from the original manufacturer or authorized distributors?
All LT1009CLPRE3 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 LT1009CLPRE3 meets industry standards.
7.What is the process for return or replacement of LT1009CLPRE3?
All LT1009CLPRE3 units undergo pre-shipment inspection (PSI). If there is an issue with LT1009CLPRE3, 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 LT1009CLPRE3 part is unused and in its original packaging.
Return procedure for LT1009CLPRE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009CLPRE3 Tags
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