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Texas Instruments LT1009CLPE3
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- Part No.:
- LT1009CLPE3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LT1009CLPE3.pdf
- Description:
- IC VREF SHUNT 0.2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,207
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Product details
Overview
LT1009CLPE3 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 typical temperature coefficient, and 0.6 Ω max dynamic impedance at 1 mA. It operates from 0°C to 70°C and supports adjustable output via ADJ pin for ±5% system calibration-used in 8-bit ADC/DAC references and power-supply monitors.
For engineers reviewing the LT1009CLPE3 datasheet, LT1009CLPE3 pinout, LT1009CLPE3 application, or LT1009CLPE3 equivalent, this page delivers verified electrical specs, terminal roles, real-world use cases, and validated alternatives for precision analog design, embedded reference circuits, and industrial sensor signal conditioning.
Technical Context
The LT1009CLPE3 implements a trimmed bandgap-based shunt reference architecture with on-chip laser trimming for initial voltage accuracy and minimized αVZ. Its three-terminal configuration (ANODE, CATHODE, ADJ) enables both fixed 2.5-V operation and ±5% adjustment without external components.
It functions as a two-terminal device when ADJ is left open, delivering stable 2.5 V across 400 µA–10 mA cathode current, while maintaining low dynamic impedance (≤0.6 Ω) and long-term drift of ≤20 ppm/khr at 25°C-critical for metrology-grade references.
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 ±0.2% absolute accuracy for high-resolution data converters. |
| Initial Tolerance | ±5 mV max (LP package); eliminates need for post-assembly trimming in production test flows. |
| Temp Coefficient (αVZ) | 15 ppm/°C typical (0°C to 70°C); enables stable performance across commercial temperature range without compensation. |
| Dynamic Impedance | 0.6 Ω max at 1 mA; minimizes output voltage shift under load transients in feedback loops and regulator references. |
| Adjustment Range | ±5% via ADJ pin; allows fine-tuning to cancel system-level gain/offset errors without adding external resistors. |
| Operating Current Range | 400 µA to 10 mA; supports low-power sensor interfaces and high-current reference buffers alike. |
| Long-Term Drift | 20 ppm/khr at 25°C; guarantees stability over years in unattended instrumentation and calibration equipment. |
Pinout & Package
LT1009CLPE3 uses the TO-92 (LP) package: 3-pin through-hole plastic case, 5.34 mm max height, straight or formed leads, RoHS-compliant tin (Sn) lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ANODE) | Anode connection of internal shunt reference | Connected to system ground in standard shunt configuration; defines current sink path. |
| 2 (CATHODE) | Cathode connection (output node) | Provides 2.5-V reference output; must be decoupled with ≥1 µF capacitor for stability. |
| 3 (ADJ) | Adjustment terminal | Enables ±5% output tuning via external voltage; open-circuit for nominal 2.5-V operation. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip laser trimming | Delivers ±0.2% initial tolerance without external calibration, reducing BOM count and test time. |
| Terminal-for-terminal LM136-2.5 replacement | Direct drop-in substitution in legacy designs, eliminating redesign and qualification effort. |
| No external trim network required | Simplifies layout and improves reliability by removing potentiometers and associated PCB traces. |
| Low dynamic impedance (0.6 Ω) | Maintains regulation during fast current steps-essential for SAR ADC reference settling and DAC buffer stability. |
| Wide operating current range (400 µA–10 mA) | Supports both ultra-low-power IoT sensors and high-drive reference buffers without reselection. |
Applications
| 5-V System Reference | 8-Bit ADC/DAC Reference |
|---|---|
Use Scenario: Providing stable 2.5-V reference for microcontroller ADC inputs in industrial control panels. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise full-scale input range for analog-to-digital conversion. Use Value: Enables consistent 8-bit resolution (±1 LSB = 9.8 mV) across temperature and supply variations. |
Use Scenario: Serving as reference for serial-output DACs in programmable logic controller (PLC) analog output modules. IC Role / Device Role / Timing Role: Precision DC reference source defining DAC output voltage accuracy and monotonicity. Use Value: Maintains ±0.2% absolute accuracy over 0°C–70°C, ensuring calibrated 0–5 V outputs meet IEC 61000-4 compliance. |
| Power-Supply Monitor | Digital Voltmeter Front-End |
Use Scenario: Monitoring +5 V rail integrity in telecom line cards using comparator-based brownout detection. IC Role / Device Role / Timing Role: Stable threshold reference for voltage supervisor ICs or discrete comparator circuits. Use Value: Guarantees trip point repeatability within ±5 mV, preventing false resets during transient load events. |
Use Scenario: Acting as primary reference in handheld digital multimeters measuring DC voltage up to 20 V. IC Role / Device Role / Timing Role: High-stability shunt reference enabling autoranging and auto-zeroing functions. Use Value: Supports 0.1% measurement accuracy over 1-year calibration interval due to <20 ppm/khr drift. |
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 | ±1% initial tolerance (25 mV), higher 50 ppm/°C tempco, no ADJ pin | Lacks adjustability; requires external trim for high-accuracy systems | Select when cost sensitivity outweighs precision requirements and existing LM136 footprint is retained. |
| TL431ACLP | 2.495 V nominal, ±1% tolerance, 50 ppm/°C, adjustable via resistor divider | Requires two external resistors for 2.5-V setting; higher dynamic impedance (0.2 Ω typical but not guaranteed) | Choose for cost-driven consumer designs where ±1% accuracy suffices and board space permits resistors. |
Compared with LM136-2.5 and TL431ACLP, the LT1009CLPE3 delivers superior initial accuracy and lower temperature drift without external components-making it optimal for applications demanding <0.2% reference stability without layout or BOM overhead.
Availability
LT1009CLPE3 is available at Aetrix Electronics and suitable for 5-V system references, 8-bit data converter references, and power-supply monitors requiring stable component supply across commercial temperature range and long-lifecycle deployments.
Supply support for LT1009CLPE3 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 engineered specifically for high-accuracy, low-drift shunt reference applications in industrial instrumentation, test equipment, and data acquisition systems-prioritizing stability, ease of use, and compatibility with legacy designs.
FAQ
What is the exact reference voltage tolerance of LT1009CLPE3 at 25°C?
The LT1009CLPE3 has a maximum initial tolerance of ±5 mV (±0.2%) at 25°C in the TO-92 (LP) package, as specified in the Electrical Characteristics table of the TI SLVS013N datasheet. This value is guaranteed across all units and does not require user calibration.
Can LT1009CLPE3 replace LM136-2.5 without circuit modifications?
Yes, LT1009CLPE3 is explicitly designed as a terminal-for-terminal replacement for LM136-2.5. Both share identical TO-92 pinout (ANODE-CATHODE-ADJ vs ANODE-CATHODE-NC), same operating current range, and compatible thermal characteristics-enabling direct substitution in existing layouts.
What is the function of the ADJ pin on LT1009CLPE3?
The ADJ pin on LT1009CLPE3 allows ±5% adjustment of the output reference voltage by applying an external voltage between 0.6 V and VZ – 0.6 V. When left open, LT1009CLPE3 operates at its nominal 2.5 V output with no external components required.
What is the minimum operating current for stable regulation of LT1009CLPE3?
The LT1009CLPE3 maintains regulation down to 400 µA cathode current, as confirmed in the Electrical Characteristics table. Below this level, reference voltage deviation exceeds specification limits; design must ensure ≥400 µA minimum sink current under all operating conditions.
Does LT1009CLPE3 require an output capacitor for stability?
Yes, TI recommends ≥1 µF ceramic capacitor from CATHODE to ANODE (ground) for stability, especially under dynamic load conditions. This prevents oscillation and reduces noise, as verified in Figure 7 (Transient Response) of the SLVS013N datasheet.
LT1009CLPE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- 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
LT1009CLPE3 FAQ
1.How can I place an order for LT1009CLPE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009CLPE3 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 LT1009CLPE3 reliable?
The price and inventory of LT1009CLPE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009CLPE3 is usually 5 days.
3.What payment methods are accepted for LT1009CLPE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009CLPE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009CLPE3?
LT1009CLPE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009CLPE3 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 LT1009CLPE3?
For technical support, including LT1009CLPE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009CLPE3 requirements.
6.How does Aetrix verify that LT1009CLPE3 is sourced from the original manufacturer or authorized distributors?
All LT1009CLPE3 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 LT1009CLPE3 meets industry standards.
7.What is the process for return or replacement of LT1009CLPE3?
All LT1009CLPE3 units undergo pre-shipment inspection (PSI). If there is an issue with LT1009CLPE3, 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 LT1009CLPE3 part is unused and in its original packaging.
Return procedure for LT1009CLPE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009CLPE3 Tags
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