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Texas Instruments LT1009ILP
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- Part No.:
- LT1009ILP
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LT1009ILP.pdf
- Description:
- IC VREF SHUNT 0.2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:245
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Product details
Overview
LT1009ILP from Texas Instruments is a precision 2.5-V shunt voltage reference in TO-92 (LP) package, rated for –40°C to 85°C operation, with ±0.2% initial tolerance (±5 mV), 0.6 Ω max dynamic impedance, and ±5% adjustable output via ADJ pin - used in ADC/DAC references and power-supply monitors.
For engineers reviewing the LT1009ILP datasheet, LT1009ILP pinout, LT1009ILP application, or LT1009ILP equivalent, key selection criteria include temperature coefficient (20–35 ppm/°C), low-current operation (400 µA–10 mA), TO-92 thermal resistance (140 °C/W), and direct interchangeability with LM136-2.5 in industrial sensing and data acquisition systems.
Technical Context
The LT1009ILP implements a bandgap-based shunt regulator architecture with on-chip laser trimming to achieve tight initial voltage accuracy and minimized αVZ. Its three-terminal configuration (ANODE, CATHODE, ADJ) enables system-level calibration without external components.
It operates as a two-terminal device when ADJ is left open, delivering fixed 2.5 V; with ADJ connected, it supports ±5% output adjustment while maintaining stable temperature performance across –40°C to 85°C. Dynamic impedance remains ≤0.6 Ω at IZ = 1 mA, ensuring minimal load-induced voltage shift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V to 2.505 V at 25°C, IZ = 1 mA - ensures high-accuracy system calibration within ±2 mV. |
| Initial Tolerance | ±0.2% max (±5 mV) - eliminates need for post-assembly trimming in precision analog circuits. |
| Temp Coefficient | 20–35 ppm/°C over –40°C to 85°C - maintains stability in extended-temperature industrial environments. |
| Dynamic Impedance | 0.6 Ω max at IZ = 1 mA - minimizes output voltage variation under dynamic load changes. |
| Adjustment Range | ±5% via ADJ pin - allows fine-tuning to compensate for PCB trace resistance or sensor offset errors. |
| Operating Current | 400 µA to 10 mA - supports ultra-low-power sensor nodes and high-current reference buffering. |
| Long-Term Drift | 20 ppm/khr at 25°C - ensures multi-year accuracy retention in unattended monitoring systems. |
Pinout & Package
LT1009ILP uses TO-92 (LP) package with straight leads, 5.34 mm max height, and 140 °C/W junction-to-ambient thermal resistance. Pin 1 = ANODE, Pin 2 = CATHODE, Pin 3 = ADJ; Pins marked "NC" are not internally connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ANODE) | Reference current sink node | Connects to system ground or low-impedance return path; defines current flow direction into device. |
| Pin 2 (CATHODE) | Output voltage node | Provides regulated 2.5 V output; must be decoupled with ≥1 µF capacitor for stability in noisy environments. |
| Pin 3 (ADJ) | Voltage adjustment control | Enables ±5% output tuning via resistor divider; open-circuit configures fixed 2.5 V mode. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed voltage accuracy | ±5 mV initial error in LP package - reduces BOM count by eliminating external trim pots in factory-calibrated instruments. |
| No external adjustment required | Guaranteed min temp coefficient without trim - simplifies layout and improves long-term reliability in sealed enclosures. |
| Terminal-for-terminal LM136 replacement | Same pinout and electrical behavior as LM136-2.5 - enables drop-in upgrade with no PCB revision in legacy designs. |
| Wide operating current range | 400 µA–10 mA operation - supports both battery-powered sensors and high-drive reference buffers. |
| Low dynamic impedance | 0.6 Ω max at 1 mA - maintains regulation during fast transient loads typical in multiplexed ADC sampling. |
Applications
| Industrial Process Transmitters | Digital Multimeters |
|---|---|
Use Scenario: 4–20 mA current-loop transmitter with microcontroller-based signal conditioning and isolated DAC output. IC Role / Device Role / Timing Role: Precision 2.5-V shunt reference for DAC full-scale calibration and ADC input scaling. Use Value: ±5 mV initial tolerance and 20 ppm/°C tempco ensure <0.1% total error over –40°C to 85°C ambient range. | Use Scenario: Portable handheld DMM with auto-ranging, 16-bit SAR ADC, and dual-slope integration front-end. IC Role / Device Role / Timing Role: Stable reference for ADC conversion and internal self-calibration sequence. Use Value: 0.6 Ω dynamic impedance prevents reading drift during rapid range switching and battery voltage sag. |
| Programmable Logic Controller (PLC) Analog Input Modules | Isolated Power Supply Monitors |
Use Scenario: 8-channel 12-bit analog input module with galvanic isolation, cold-junction compensation, and HART communication. IC Role / Device Role / Timing Role: Local 2.5-V reference for isolated sigma-delta ADC and sensor excitation circuitry. Use Value: ±5% ADJ capability compensates for transformer winding ratio tolerances and optocoupler CTR variation across batches. | Use Scenario: Secondary-side monitoring of isolated DC-DC converter output using opto-feedback loop with voltage supervisor. IC Role / Device Role / Timing Role: Shunt reference providing accurate trip threshold for overvoltage protection comparator. Use Value: Low long-term drift (20 ppm/khr) ensures consistent fault detection thresholds over 10+ years of field operation. |
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 | Same 2.5 V nominal output, but ±1% initial tolerance and higher 100 ppm/°C tempco; no ADJ pin. | Not suitable where ±5 mV accuracy or system-level trimming is required. | Select LM136-2.5 only for cost-sensitive, non-precision applications with relaxed tempco requirements. |
| TL431ACLP | 2.495 V reference, ±1% tolerance, 50 ppm/°C tempco, adjustable via resistive divider; requires external resistors for 2.5 V setting. | Higher quiescent current (1 mA min) and less stable at low IZ; unsuitable for sub-500 µA systems. | Choose TL431ACLP when needing programmable reference voltages beyond 2.5 V or higher output current drive. |
Compared with LM136-2.5 and TL431ACLP, the LT1009ILP delivers superior initial accuracy and temperature stability in a pin-compatible TO-92 package, making it optimal for industrial-grade instrumentation where long-term calibration integrity is critical.
Availability
LT1009ILP is available at Aetrix Electronics and suitable for industrial process transmitters, portable test equipment, and PLC analog modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LT1009ILP 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 power management technologies, with decades of heritage in precision reference design.
The LT1009 product line was engineered specifically for high-stability, low-drift voltage referencing in industrial and test-and-measurement systems - emphasizing laser-trimmed accuracy, wide operating current range, and robust thermal performance.
FAQ
What is the maximum operating temperature range for the LT1009ILP?
The LT1009ILP is characterized for operation from –40°C to +85°C, matching its "I" grade designation. This extended temperature range makes it suitable for deployment in harsh industrial environments such as factory automation controllers and outdoor sensor nodes where ambient conditions exceed commercial-grade limits. The LT1009ILP maintains specified electrical performance-including 20–35 ppm/°C temperature coefficient-across this full range.
Can the LT1009ILP replace the LM136-2.5 without board modifications?
Yes, the LT1009ILP is explicitly designed as a terminal-for-terminal replacement for the LM136-2.5 in TO-92 packages. Both share identical pinout (ANODE–CATHODE–ADJ), mechanical footprint, and basic functional behavior. However, the LT1009ILP adds an ADJ pin that can be left open for fixed 2.5 V operation - preserving full compatibility while enabling optional system-level calibration if needed.
What is the minimum cathode current required for stable regulation in the LT1009ILP?
The LT1009ILP achieves stable regulation down to 400 µA cathode current, as confirmed in its Electrical Characteristics table under "Change in reference voltage with current." This ultra-low minimum current enables use in energy-constrained applications like battery-powered data loggers and wireless sensor nodes, where quiescent power budget is critical. Operation below 400 µA may result in increased output voltage deviation.
How does the ADJ pin function in the LT1009ILP, and what is its adjustment range?
The ADJ pin on the LT1009ILP allows ±5% output voltage adjustment around the nominal 2.5 V reference by connecting an external resistor divider between CATHODE and ground. When ADJ is open, the device operates as a fixed 2.5 V shunt reference. With ADJ biased, the output becomes tunable from 2.375 V to 2.625 V - useful for compensating system-level gain errors or matching sensor full-scale outputs without adding external op-amps.
Is the LT1009ILP RoHS compliant and lead-free?
Yes, the LT1009ILP is RoHS compliant and features a tin (Sn) lead finish, as documented in TI's Package Option Addendum. It meets JEDEC J-STD-020 moisture sensitivity Level-1 (unlimited floor life at ≤30°C/60% RH) and is qualified for lead-free reflow per IPC/JEDEC J-STD-020. The TO-92 (LP) package contains no lead-based solder or plating, supporting environmentally compliant manufacturing.
LT1009ILP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- 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
LT1009ILP FAQ
1.How can I place an order for LT1009ILP through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009ILP 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 LT1009ILP reliable?
The price and inventory of LT1009ILP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009ILP is usually 5 days.
3.What payment methods are accepted for LT1009ILP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009ILP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009ILP?
LT1009ILP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009ILP 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 LT1009ILP?
For technical support, including LT1009ILP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009ILP requirements.
6.How does Aetrix verify that LT1009ILP is sourced from the original manufacturer or authorized distributors?
All LT1009ILP 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 LT1009ILP meets industry standards.
7.What is the process for return or replacement of LT1009ILP?
All LT1009ILP units undergo pre-shipment inspection (PSI). If there is an issue with LT1009ILP, 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 LT1009ILP part is unused and in its original packaging.
Return procedure for LT1009ILP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009ILP Tags
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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