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Texas Instruments LT1009IPWG4
- Part No.:
- LT1009IPWG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LT1009IPWG4.pdf
- Description:
- IC VREF SHUNT 0.4% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,086
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Product details
Overview
LT1009IPWG4 from Texas Instruments is a precision 2.5-V shunt voltage reference IC in TSSOP-8 package, featuring ±10 mV initial tolerance (±0.4%), 20–35 ppm/°C temperature coefficient over –40°C to +85°C, 0.6 Ω dynamic impedance at 1 mA, and adjustable output via ADJ pin (±5% range). It serves as a stable reference for ADC/DAC circuits, power-supply monitors, and digital voltmeters.
For engineers reviewing the LT1009IPWG4 datasheet, LT1009IPWG4 pinout, LT1009IPWG4 application, or LT1009IPWG4 equivalent, key selection criteria include its industrial-grade temperature range, low dynamic impedance, trimmable reference voltage, and compatibility with LM136-2.5 in system-level calibration and precision analog signal chains.
Technical Context
The LT1009IPWG4 operates as a three-terminal shunt reference with ANODE, CATHODE, and ADJ terminals - enabling both fixed 2.5-V operation and ±5% adjustment without external components. Its on-chip trimming ensures low initial error and minimized αVZ across temperature.
It delivers stable regulation over 400 µA–10 mA cathode current, maintains <1.4 Ω impedance across full operating range, and exhibits <15 mV total voltage drift from –40°C to +85°C. The device requires no external capacitors for stability and supports direct replacement of LM136-2.5 in existing designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.475 V to 2.525 V at IZ = 1 mA, full –40°C to +85°C range - guarantees tight system-level accuracy without post-assembly calibration. |
| Initial Tolerance | ±10 mV (±0.4%) in TSSOP package - enables high-accuracy 12-bit+ data conversion without trimming network. |
| Temp Coefficient (αVZ) | 20–35 ppm/°C (max) - ensures ≤12 mV total drift over industrial temperature range, critical for unheated instrumentation. |
| Dynamic Impedance | 0.6 Ω max at 1 mA - minimizes load-induced reference perturbation in multiplexed ADC sampling systems. |
| Adjustment Range | ±5% via ADJ pin - allows fine-tuning to compensate for PCB trace resistance, DAC offset, or sensor gain errors. |
| Operating Current | 400 µA to 10 mA cathode current - supports ultra-low-power sensor nodes and high-current reference buffering simultaneously. |
| Long-Term Drift | 20 ppm/khr at 25°C - ensures <0.05% reference degradation over 5-year product lifetime in field-deployed equipment. |
Pinout & Package
TSSOP-8 package (PW), 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 remain unconnected or tied to GND per layout guidelines. |
| 4 | ANODE | Reference ground return path - connects to system GND; low-impedance routing required for noise immunity. |
| 5, 7 | CATHODE | Main current sink terminal - carries full reference current; requires thermal relief and adequate copper area for 150°C junction limit. |
| 8 | ADJ | Voltage adjustment control - open for nominal 2.5 V; externally biased to shift output ±5% for system-level error correction. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip laser trimming | Eliminates need for external potentiometer or resistor network - reduces BOM count and board space in portable test gear. |
| Terminal-for-terminal LM136-2.5 replacement | Enables drop-in upgrade in legacy designs without PCB revision - preserves existing layout, bill of materials, and firmware. |
| Wide cathode current range (400 µA–10 mA) | Supports both battery-powered microamp systems and high-speed 10-MSPS ADC reference buffers in same design family. |
| No external capacitor required | Guarantees stability under all load conditions - simplifies layout and avoids phase-margin risks in noisy industrial environments. |
| Industrial temperature grade (–40°C to +85°C) | Validated performance across full range - suitable for automotive body control modules, factory automation I/O cards, and outdoor metering. |
Applications
| High-Accuracy Data Acquisition | Industrial Power-Supply Monitoring |
|---|---|
|
Use Scenario: 16-bit SAR ADC in programmable logic controller (PLC) analog input module measuring 4–20 mA current loops. IC Role / Device Role / Timing Role: Primary voltage reference for ADC internal conversion core and external PGA gain-setting resistors. Use Value: 0.4% initial tolerance and 35 ppm/°C drift ensure <±0.02% total measurement error across ambient temperature swings in cabinet-mounted PLCs. |
Use Scenario: Overvoltage/undervoltage detection circuit in 24-V DC industrial power supply with remote sensing. IC Role / Device Role / Timing Role: Stable threshold reference for comparator-based fault detection logic. Use Value: Low dynamic impedance prevents false triggering during transient load steps; ±5% ADJ pin enables precise trip-point setting without calibration resistors. |
| Digital Multimeter Reference | Current-Loop Transmitter Calibration |
|
Use Scenario: Benchtop digital multimeter requiring 2.5-V reference for autoranging DMM front-end scaling. IC Role / Device Role / Timing Role: Master reference for dual-slope integrator and auto-zero amplifier stages. Use Value: 20 ppm/khr long-term stability ensures <10 ppm/year drift - meets ANSI/IEEE C37.90.1 Class 0.1 accuracy requirements without annual recalibration. |
Use Scenario: 4–20 mA HART-enabled transmitter where loop-powered microcontroller needs precise internal DAC reference. IC Role / Device Role / Timing Role: Low-power shunt reference supplying 2.5 V to 12-bit DAC and HART modem bias network. Use Value: 400 µA minimum operating current allows operation down to 3.3-V supply rails while maintaining <0.01% linearity error over full temperature range. |
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 | Higher initial tolerance (±1%), wider tempco (50 ppm/°C), no ADJ pin - requires external trim for precision use. | Lacks ±5% adjustability; not suitable for closed-loop calibration or multi-rail systems needing matched references. | Select when cost is primary constraint and ±1% accuracy suffices; avoid where LT1009IPWG4's trim capability eliminates external components. |
| TL431ACDBVR | 2.495 V nominal, ±0.5% initial tolerance, 37 ppm/°C tempco, adjustable via two-resistor divider - higher quiescent current (1 mA min). | Requires external resistors for adjustment; less stable at low currents; not pin-compatible with LT1009IPWG4. | Choose for cost-sensitive consumer applications where SOT-23 footprint is preferred and 1-mA minimum current is acceptable. |
Compared with LM136-2.5 and TL431ACDBVR, the LT1009IPWG4 offers superior initial accuracy and integrated adjustability in a compact TSSOP-8 package - delivering measurable BOM reduction and calibration flexibility in industrial instrumentation and automated test equipment.
Availability
LT1009IPWG4 is available at Aetrix Electronics and suitable for industrial power monitoring, precision data acquisition, and current-loop transmitter applications requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LT1009IPWG4 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 connectivity technologies with over 50 years of innovation in precision analog ICs.
The LT1009IPWG4 belongs to TI's precision voltage reference product line, engineered specifically for industrial, test & measurement, and process control systems demanding high stability, low drift, and robust thermal performance.
FAQ
What is the maximum operating junction temperature for the LT1009IPWG4?
The LT1009IPWG4 has an absolute maximum operating virtual junction temperature of 150°C. Under recommended conditions (–40°C to +85°C ambient), proper PCB thermal design - including adequate copper pour on cathode pins and minimal trace length - ensures safe operation within this limit. Derating is required above 85°C ambient per θJA = 149°C/W for TSSOP package.
Can the LT1009IPWG4 replace the LM136-2.5 without PCB changes?
Yes, the LT1009IPWG4 is specified as a terminal-for-terminal replacement for LM136-2.5 in TSSOP-8 (PW) package. Pinout, footprint, and electrical interface are identical - ANODE, CATHODE, and ADJ map directly to LM136-2.5's cathode, anode, and adjust pins. No PCB modifications are needed for drop-in substitution.
What is the purpose of the NC pins on the LT1009IPWG4?
The LT1009IPWG4 has four NC (no internal connection) pins - pins 1, 2, 3, and 6 in the TSSOP-8 package. These pins are electrically isolated from the die and serve only mechanical or thermal roles. They may be left floating, grounded, or connected to thermal pads per layout best practices - but must never be used as signal paths or current carriers.
How does the ADJ pin function in the LT1009IPWG4?
The ADJ pin on the LT1009IPWG4 enables ±5% output voltage adjustment by applying a bias voltage between 0.6 V and (VZ – 0.6 V). When left open, the device operates at nominal 2.5 V. This feature allows system-level compensation for PCB trace resistance, DAC gain error, or sensor nonlinearity - eliminating need for external trim pots or resistor networks.
Is the LT1009IPWG4 suitable for battery-powered applications?
Yes, the LT1009IPWG4 supports cathode currents as low as 400 µA while maintaining specification compliance - making it suitable for battery-powered devices like handheld meters and wireless sensors. Its low 0.6 Ω dynamic impedance ensures stable reference voltage even during pulsed current loads typical in sleep/wake-cycle systems.
LT1009IPWG4 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
LT1009IPWG4 FAQ
1.How can I place an order for LT1009IPWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009IPWG4 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 LT1009IPWG4 reliable?
The price and inventory of LT1009IPWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009IPWG4 is usually 5 days.
3.What payment methods are accepted for LT1009IPWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009IPWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009IPWG4?
LT1009IPWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009IPWG4 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 LT1009IPWG4?
For technical support, including LT1009IPWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009IPWG4 requirements.
6.How does Aetrix verify that LT1009IPWG4 is sourced from the original manufacturer or authorized distributors?
All LT1009IPWG4 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 LT1009IPWG4 meets industry standards.
7.What is the process for return or replacement of LT1009IPWG4?
All LT1009IPWG4 units undergo pre-shipment inspection (PSI). If there is an issue with LT1009IPWG4, 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 LT1009IPWG4 part is unused and in its original packaging.
Return procedure for LT1009IPWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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