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Texas Instruments LT1009ILPE3
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- Part No.:
- LT1009ILPE3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LT1009ILPE3.pdf
- Description:
- IC VREF SHUNT 0.2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,246
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Product details
Overview
LT1009ILPE3 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 LT1009ILPE3 datasheet, LT1009ILPE3 pinout, LT1009ILPE3 application, or LT1009ILPE3 equivalent, key selection criteria include its TO-92 (LP) package compatibility, wide operating current range (400 µA to 10 mA), low long-term drift (20 ppm/khr), and direct interchangeability with LM136-2.5 in industrial temperature-grade designs.
Technical Context
The LT1009ILPE3 implements a bandgap-derived shunt reference architecture with on-chip laser trimming to minimize both initial error and temperature coefficient (αVZ). Its three-terminal configuration (ANODE, CATHODE, ADJ) enables system-level calibration without external components while maintaining stable regulation across load and temperature variations.
It operates as a two-quadrant device: sinking current through the CATHODE when forward-biased (reference mode), or conducting forward current through ANODE–CATHODE (forward mode) at ≤1 V. The ADJ terminal allows ±5% output adjustment by injecting current into or sinking from the internal divider node, preserving temperature stability per TI's application note Figure 8.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V to 2.505 V at IZ = 1 mA (LP package, –40°C to +85°C); ensures <±5 mV absolute accuracy in industrial environments. |
| Initial Tolerance | ±10 mV max (±0.4%) for D/PW packages; ±5 mV max (±0.2%) for LP package - tighter spec enabled by TO-92 trimming process. |
| Temp Coefficient αVZ | 20–35 ppm/°C full-range (–40°C to +85°C); enables stable 12-bit system accuracy without external compensation. |
| Dynamic Impedance ZZ | 1.4 Ω max at IZ = 1 mA; minimizes output voltage shift under dynamic load transients in precision measurement circuits. |
| Adjustment Range | ±5% via ADJ pin; eliminates system gain/offset errors without adding trim pots or DACs in calibration-critical applications. |
| Operating Current Range | 400 µA to 10 mA; supports ultra-low-power sensor interfaces and high-current reference buffering in single-supply systems. |
| Long-Term Drift | 20 ppm/khr at 25°C; guarantees <±0.05% output shift over 5+ years in deployed instrumentation. |
Pinout & Package
LT1009ILPE3 is housed in a TO-92 (LP) package - a 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. "NC" markings in D/PW schematics do not apply to LP variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ANODE) | Anode of internal shunt regulator | Connects to system ground or low-impedance return path; reverse-biased during normal reference operation. |
| Pin 2 (CATHODE) | Cathode of internal shunt regulator | Primary output node; sinks current to maintain 2.5 V at external load; requires series resistor from supply. |
| Pin 3 (ADJ) | Adjustment terminal | Allows ±5% output tuning via external current source/sink; open-circuit default yields nominal 2.5 V output. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed bandgap reference | Eliminates need for external calibration; achieves ±5 mV initial tolerance in TO-92 package without post-package trimming. |
| Three-terminal adjustability | ADJ pin enables system-level gain/offset correction without altering PCB layout or adding passive components. |
| Wide current operating range | Functions reliably from 400 µA (ultra-low-power sensors) to 10 mA (driving op-amp buffers or ADC references). |
| Low dynamic impedance | 1.4 Ω output impedance maintains <1 mV droop during 1 mA load steps - critical for high-resolution data acquisition. |
| Direct LM136-2.5 replacement | Pin-compatible and functionally identical in TO-92 form factor; removes external trim network in legacy designs. |
Applications
| Industrial Power-Supply Monitor | 8-Bit Data Converter Reference |
|---|---|
Use Scenario: Monitoring 5-V rail integrity in PLC backplanes with ±2% fault detection threshold. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5-V comparison point for comparator input. Use Value: 20 ppm/°C tempco ensures <±0.1% trip-point drift over –40°C to +85°C ambient, eliminating recalibration. |
Use Scenario: Supplying reference voltage to 8-bit SAR ADC in battery-powered handheld meter. IC Role / Device Role / Timing Role: Precision DC reference source for ADC full-scale determination. Use Value: ±5 mV initial tolerance guarantees <±0.2% full-scale error before calibration - meets 8-bit INL spec. |
| Digital Voltmeter Front-End | Current-Loop Transmitter Calibration |
Use Scenario: High-impedance 2.5-V reference for autoranging DVM input stage with 10-MΩ input resistance. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source for integrator ramp generation. Use Value: 20 ppm/khr long-term stability ensures <±0.02% reading drift over 2-year calibration cycle. |
Use Scenario: Calibrating 4–20 mA transmitter output using microcontroller-based DAC feedback loop. IC Role / Device Role / Timing Role: Adjustable reference enabling precise 16-bit DAC code-to-current mapping. Use Value: ±5% ADJ range compensates for DAC gain error and op-amp offset without firmware changes. |
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 (10× looser) and no ADJ pin; requires external trim network. | Legacy designs where board space permits trim pot; unsuitable for calibration-free or miniaturized layouts. | Select LT1009ILPE3 when replacing LM136-2.5 to eliminate trim components and improve accuracy. |
| TL431ACLP | Programmable 2.495 V reference with 2% initial tolerance; higher 0.2 Ω typical ZZ, but lacks ADJ pin and has different pinout (CATHODE/ANODE/REF). | Cost-sensitive consumer applications; not drop-in due to REF pin requiring voltage divider for 2.5 V setup. | Choose TL431ACLP only if budget constraints outweigh need for guaranteed 2.5 V and ADJ flexibility. |
Compared with LM136-2.5 and TL431ACLP, the LT1009ILPE3 uniquely combines factory-trimmed 0.2% tolerance, ±5% adjustability, and TO-92 pinout - enabling higher accuracy, smaller BOMs, and faster calibration in industrial instrumentation.
Availability
LT1009ILPE3 is available at Aetrix Electronics and suitable for industrial power-supply monitoring, 8-bit data converter referencing, and digital voltmeter front-ends requiring stable component supply across extended temperature ranges.
Supply support for LT1009ILPE3 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 logic technologies, with decades of heritage in precision analog ICs.
The LT1009 series was developed to replace discrete zener-based references with monolithic, trimmed shunt regulators for industrial and test equipment demanding long-term stability and minimal calibration overhead.
FAQ
What is the maximum operating current for LT1009ILPE3?
The LT1009ILPE3 supports a recommended operating current range of 400 µA to 10 mA. At 10 mA, it maintains regulation within specification up to +85°C ambient, provided thermal design limits junction temperature to ≤150°C. Exceeding 10 mA risks exceeding absolute maximum ratings and degrading long-term stability.
Does LT1009ILPE3 require an external capacitor for stability?
No, the LT1009ILPE3 is internally compensated and does not require an external capacitor for stability. Its design inherently maintains phase margin across the full operating current range (400 µA–10 mA) and temperature range (–40°C to +85°C), as verified in TI's Figure 5 (impedance vs. frequency) and Figure 7 (transient response).
Can LT1009ILPE3 be used as a 2.5-V series regulator?
No, the LT1009ILPE3 is a shunt (two-terminal + ADJ) reference, not a series regulator. It must be used with an external current-setting resistor between supply and CATHODE. Attempting series-mode operation violates its internal topology and will cause malfunction or damage.
What is the meaning of "E3" in LT1009ILPE3?
The "E3" suffix in LT1009ILPE3 denotes Texas Instruments' standard tape-and-reel packaging for TO-92 devices: ammo pack format with 2000 units per reel, lead finish of Sn (tin), and RoHS-compliant construction. It matches the ordering code LT1009ILPM listed in TI's Package Option Addendum.
How does the ADJ pin affect temperature coefficient in LT1009ILPE3?
Per TI's datasheet Section "APPLICATION INFORMATION", adjusting the LT1009ILPE3 output via the ADJ pin does not degrade its temperature coefficient - the ±5% range preserves the same 20–35 ppm/°C αVZ as the nominal 2.5-V setting. This is achieved by modulating a high-impedance internal node without disturbing the trimmed bandgap core.
LT1009ILPE3 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:
- 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
LT1009ILPE3 FAQ
1.How can I place an order for LT1009ILPE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009ILPE3 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 LT1009ILPE3 reliable?
The price and inventory of LT1009ILPE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009ILPE3 is usually 5 days.
3.What payment methods are accepted for LT1009ILPE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009ILPE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009ILPE3?
LT1009ILPE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009ILPE3 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 LT1009ILPE3?
For technical support, including LT1009ILPE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009ILPE3 requirements.
6.How does Aetrix verify that LT1009ILPE3 is sourced from the original manufacturer or authorized distributors?
All LT1009ILPE3 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 LT1009ILPE3 meets industry standards.
7.What is the process for return or replacement of LT1009ILPE3?
All LT1009ILPE3 units undergo pre-shipment inspection (PSI). If there is an issue with LT1009ILPE3, 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 LT1009ILPE3 part is unused and in its original packaging.
Return procedure for LT1009ILPE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009ILPE3 Tags
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