My Inquiry
My Account
Texas Instruments LT1009IPW
- Part No.:
- LT1009IPW
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LT1009IPW.pdf
- Description:
- IC VREF SHUNT 0.4% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,633
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1009IPW from Texas Instruments is a precision 2.5-V shunt voltage reference IC in TSSOP-8 package, rated for –40°C to +85°C operation, with ±10 mV initial tolerance (±0.4%), 20 ppm/°C max average temperature coefficient, and 0.6 Ω max dynamic impedance at 1 mA. It serves as a stable reference in ADC/DAC circuits, power-supply monitors, and digital voltmeters.
For engineers reviewing the LT1009IPW datasheet, LT1009IPW pinout, LT1009IPW application, or LT1009IPW equivalent, key selection considerations include its adjustable ±5% reference range via ADJ terminal, no-trim operation, direct interchangeability with LM136-2.5, and suitability for industrial-grade analog signal conditioning where long-term stability and low thermal drift are critical.
Technical Context
The LT1009IPW implements a bandgap-derived shunt reference 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 across 400 µA to 10 mA cathode current, maintains <1.4 Ω dynamic impedance over full temperature range, and delivers 2.5 V ±15 mV total variation from –40°C to +85°C at IZ = 1 mA - verified per SLVS013N Rev. May 2009.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.475 V to 2.525 V at IZ = 1 mA, –40°C to +85°C - ensures ≤±25 mV absolute error in industrial temperature environments. |
| Initial Tolerance | ±10 mV (±0.4%) in PW package - eliminates need for post-assembly trimming in most 8-bit data converter applications. |
| Temp Coefficient αVZ | 20 ppm/°C max (–40°C to +85°C) - supports <±0.5 mV drift over full operating range, critical for precision sensor interfaces. |
| Dynamic Impedance ZZ | 0.6 Ω max at 1 mA, 25°C; 1.4 Ω max over full temp range - minimizes load-induced reference voltage perturbation in noisy supply rails. |
| Adjustment Range | ±5% via ADJ pin (VADJ = GND to VZ) - allows fine-tuning to compensate for PCB trace resistance or DAC offset without external resistors. |
| Long-Term Drift | 20 ppm/khr at 25°C - guarantees <±0.1 mV shift after 1000 hours of operation, supporting high-reliability embedded instrumentation. |
| Operating Current Range | 400 µA to 10 mA - enables use with ultra-low-power microcontrollers and high-current buffer stages alike. |
Pinout & Package
TSSOP-8 (PW) package, 3.0 mm × 4.4 mm × 1.2 mm height, moisture sensitivity level 1, lead finish NiPdAu, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 6 | NC | No internal connection - unused pins; must be left floating or grounded per layout best practices. |
| 4 | ANODE | Anode terminal of internal shunt reference - connects to system ground or low-impedance return path. |
| 5, 7 | CATHODE | Primary cathode output - supplies 2.5 V reference voltage; requires series resistor from input supply. |
| 8 | ADJ | Adjustment terminal - enables ±5% reference voltage tuning via external voltage source or potentiometer. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed 2.5 V reference | Eliminates external trim network required by LM136, reducing BOM count and layout area in space-constrained designs. |
| Three-terminal adjustability | Enables system-level calibration without altering feedback networks - essential for factory-trimmed test equipment. |
| Low dynamic impedance | 0.6 Ω max at 1 mA ensures minimal voltage droop during transient load steps in high-speed data acquisition systems. |
| Wide cathode current range | 400 µA to 10 mA supports both battery-powered sensors and high-drive analog front-ends without redesign. |
| Direct LM136-2.5 replacement | Same pinout and electrical behavior in D/PW packages - enables drop-in upgrade path with no PCB changes. |
Applications
| 5-V System Reference | 8-Bit ADC/DAC Reference |
|---|---|
Use Scenario: Providing stable 2.5 V reference for microcontroller-based data loggers powered from unregulated 5 V rails. IC Role / Device Role / Timing Role: Shunt reference establishing precise voltage基准 for SAR ADC conversion and DAC output scaling. Use Value: Maintains ≤±1 LSB error over –40°C to +85°C due to 20 ppm/°C αVZ and 0.4% initial tolerance. |
Use Scenario: Reference source for 8-bit successive-approximation ADCs in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Precision voltage node defining full-scale input range and DAC output resolution. Use Value: Delivers <±0.5 mV total error across temperature, ensuring consistent 256-step quantization without recalibration. |
| Power-Supply Monitor | Digital Voltmeter Front-End |
Use Scenario: Monitoring 5 V or 3.3 V rail integrity in telecom line cards using comparator-based brownout detection. IC Role / Device Role / Timing Role: Stable threshold generator for voltage supervisor ICs or discrete comparator circuits. Use Value: Enables reliable trip-point accuracy within ±10 mV over life and temperature, preventing false fault assertions. |
Use Scenario: High-stability reference in handheld digital multimeters measuring DC voltages up to 20 V. IC Role / Device Role / Timing Role: Primary reference for autoranging ADC and display scaling logic. Use Value: Supports 0.1% measurement accuracy over 1000-hour field deployment due to 20 ppm/khr long-term drift. |
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 | Higher initial tolerance (±1%), no ADJ pin, TO-92 only - lacks trim capability and industrial temp grade. | Requires external trim network for precision; limited to commercial temp range (0°C to 70°C). | Select LM136-2.5 only for cost-sensitive, non-adjustable, commercial-grade applications where ±1% accuracy suffices. |
| TL431ACDBVR | 2.495 V nominal, adjustable via two resistors, SOT-23-5 package - higher quiescent current (70 µA min), no guaranteed 20 ppm/°C αVZ. | Needs external resistor divider for 2.5 V setting; not pin-compatible; lower thermal stability in extended temperature range. | Choose TL431ACDBVR when board space is constrained and adjustable output is acceptable, but avoid for industrial temp-critical references. |
Compared with LM136-2.5 and TL431ACDBVR, the LT1009IPW uniquely combines industrial temperature rating, ±5% adjustability without external components, and guaranteed 20 ppm/°C stability - making it the only option among the three qualified for high-accuracy, field-deployed instrumentation requiring zero-trim operation.
Availability
LT1009IPW is available at Aetrix Electronics and suitable for industrial PLC analog inputs, portable test equipment, and telecom power monitoring requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LT1009IPW 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 product line was engineered specifically for industrial and instrumentation applications demanding low-drift, no-trim, and system-calibratable voltage references - targeting data acquisition, process control, and test & measurement systems.
FAQ
What is the maximum operating temperature range for the LT1009IPW?
The LT1009IPW is characterized for operation from –40°C to +85°C, as confirmed in the SLVS013N datasheet Section "RECOMMENDED OPERATING CONDITIONS". This industrial-grade rating distinguishes it from the commercial-grade LT1009C (0°C to 70°C) and makes the LT1009IPW suitable for harsh-environment deployments such as outdoor telecom infrastructure and factory-floor controllers.
Does the LT1009IPW require external trimming components?
No, the LT1009IPW does not require external trimming components. Its 2.5 V reference is laser-trimmed on-chip, achieving ±10 mV initial tolerance in the PW package. The ADJ pin enables optional ±5% adjustment without resistors - unlike the LM136-2.5, which mandates an external trim network to meet similar accuracy targets. This is explicitly stated in the "DESCRIPTION" section of the SLVS013N datasheet.
Is the LT1009IPW pin-compatible with the LM136-2.5?
Yes, the LT1009IPW is pin-compatible with the LM136-2.5 in the TSSOP-8 (PW) and SOIC-8 (D) packages, as confirmed by identical pin numbering, terminal functions (ANODE/CATHODE/ADJ), and mechanical outlines in TI's package drawings PW0008A and D0008A. This enables direct replacement without PCB modification, per the datasheet statement: "In many applications, the LT1009 can be used as a terminal-for-terminal replacement for the LM136-2.5".
What is the dynamic impedance specification of the LT1009IPW at full temperature range?
The LT1009IPW has a dynamic impedance (ZZ) of 1.4 Ω maximum over the full –40°C to +85°C operating range at IZ = 1 mA, as specified in the "ELECTRICAL CHARACTERISTICS" table of SLVS013N. At 25°C, ZZ is tighter at 0.6 Ω max. This low impedance ensures minimal reference voltage perturbation under varying load conditions in precision analog circuits.
Can the LT1009IPW be used in battery-powered applications?
Yes, the LT1009IPW supports cathode currents as low as 400 µA, enabling use in battery-powered applications such as portable data loggers and handheld meters. Its 20 ppm/khr long-term drift and low temperature coefficient ensure stable reference performance over extended operating life without periodic recalibration - critical for field-deployed devices where maintenance access is limited.
LT1009IPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.4%
- 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:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
LT1009IPW FAQ
1.How can I place an order for LT1009IPW through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009IPW 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 LT1009IPW reliable?
The price and inventory of LT1009IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009IPW is usually 5 days.
3.What payment methods are accepted for LT1009IPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009IPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009IPW?
LT1009IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009IPW 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 LT1009IPW?
For technical support, including LT1009IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009IPW requirements.
6.How does Aetrix verify that LT1009IPW is sourced from the original manufacturer or authorized distributors?
All LT1009IPW 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 LT1009IPW meets industry standards.
7.What is the process for return or replacement of LT1009IPW?
All LT1009IPW units undergo pre-shipment inspection (PSI). If there is an issue with LT1009IPW, 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 LT1009IPW part is unused and in its original packaging.
Return procedure for LT1009IPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009IPW Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
