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Texas Instruments LT1009IPWE4
- Part No.:
- LT1009IPWE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LT1009IPWE4.pdf
- Description:
- IC VREF SHUNT 0.4% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,436
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Product details
Overview
LT1009IPWE4 from Texas Instruments is a precision 2.5-V shunt voltage reference IC operating over –40°C to 85°C, featuring ±10 mV initial tolerance (±0.4%), 1.4 Ω max dynamic impedance at 1 mA, and ±5% adjustable output via ADJ pin. It serves as a stable reference in ADC/DAC circuits, power-supply monitors, and digital voltmeters.
For engineers reviewing the LT1009IPWE4 datasheet, LT1009IPWE4 pinout, LT1009IPWE4 application, or LT1009IPWE4 equivalent, this page delivers verified electrical specs, package mapping to TSSOP-8, terminal roles, real-world use cases, and two validated alternative parts with documented functional differences.
Technical Context
The LT1009IPWE4 implements a bandgap-based shunt reference architecture with on-chip laser trimming for initial accuracy and low temperature coefficient. Its three-terminal configuration (ANODE, CATHODE, ADJ) enables system-level calibration without external components.
It operates across 400 µA–10 mA cathode current, maintains <15 mV full-range voltage drift (–40°C to 85°C), and delivers 25 ppm/°C typical average temperature coefficient - all while requiring no external capacitors or adjustments for basic operation.
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 - ensures stable 2.5-V基准 under industrial temperature stress |
| Initial Tolerance | ±10 mV (±0.4%) in TSSOP-8 package - eliminates need for post-mount trimming in high-volume production |
| Dynamic Impedance | 1.4 Ω max at IZ = 1 mA - minimizes load-induced output variation in precision feedback loops |
| Temp Coefficient (αVZ) | 20–35 ppm/°C (–40°C to 85°C) - supports accurate measurements across extended industrial environments |
| Adjustment Range | ±5% via ADJ pin - allows fine-tuning to compensate for PCB trace resistance or system gain errors |
| Long-Term Drift | 20 ppm/khr at 25°C - guarantees reference stability over years of continuous operation |
| Operating Current | 400 µA to 10 mA - compatible with low-power sensor nodes and high-current DAC references alike |
Pinout & Package
TSSOP-8 package (PW), 3.0 mm × 4.4 mm footprint, 1.2 mm max height, lead-free NiPdAu finish, RoHS compliant, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 5, 6, 7 | NC (No internal connection) | Unused pins - must be left floating or tied to GND per layout best practices; no internal circuitry attached |
| 4 | ANODE | Connects to system ground or low-impedance return path; forms cathode-to-anode reference loop |
| 8 | CATHODE | Primary output node - supplies regulated 2.5 V to load; sinks current from external bias resistor |
| ADJ (Pin 3 in LP variant; Pin 8 in D/PW is CATHODE - confirmed per TI SLVS013N Fig 1 & ordering table) | ADJ | Third terminal enabling ±5% output adjustment; open-circuit default yields nominal 2.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed accuracy | ±10 mV initial tolerance in TSSOP-8 eliminates factory calibration steps for cost-sensitive instrumentation |
| Wide cathode current range | 400 µA–10 mA operation supports both ultra-low-power IoT sensors and high-speed 12-bit ADC references |
| No external trim required | On-chip trimming achieves <25 ppm/°C αVZ without potentiometers or calibration firmware |
| Terminal-for-terminal LM136-2.5 replacement | Direct drop-in substitute in SOIC-8 and TSSOP-8 footprints - preserves existing PCB layouts and BOMs |
| Low dynamic impedance | 1.4 Ω max ensures <1.4 mV output shift per 1 mA load change - critical for ratiometric sensor interfaces |
Applications
| Industrial Power-Supply Monitor | 8-Bit ADC 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: 15 mV full-range ΔVZ ensures trip-point accuracy remains within 0.6% over –40°C to 85°C. |
Use Scenario: Supplying reference to 8-bit SAR ADC in battery-powered data loggers. IC Role / Device Role / Timing Role: Precision voltage source defining LSB step size (9.8 mV) for analog input scaling. Use Value: 20 ppm/khr long-term drift prevents calibration drift beyond 0.1% over 5-year field deployment. |
| Digital Voltmeter Front-End | Current-Loop Transmitter |
Use Scenario: High-impedance 3½-digit DVM measuring 0–2.5 V signals with 1 mV resolution. IC Role / Device Role / Timing Role: Primary reference for dual-slope integrator and display scaling logic. Use Value: 0.3 mV typical forward voltage (at 2 mA) enables direct anode grounding without offset error. |
Use Scenario: Setting precise 4–20 mA loop current in HART-enabled field transmitters. IC Role / Device Role / Timing Role: Stable excitation source for DAC-controlled current mirror bias network. Use Value: ±5% ADJ pin tuning compensates for 0.5% resistor tolerance stack-up in 4–20 mA setpoint circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C25IDBZR | Fixed 2.5 V, 0.5% initial tolerance, 50 ppm/°C tempco, SOT-23-3 package, no ADJ pin | Lacks adjustability; lower accuracy but smaller footprint and lower cost | Select when board space is constrained and ±0.5% tolerance suffices without system-level trimming |
| REF3025AIDBZR | 2.5 V, 0.2% initial tolerance, 50 ppm/°C tempco, 1.4 µA max quiescent current, SOT-23-3 | Ultra-low IQ enables coin-cell operation; no ADJ pin; higher precision but no field calibration | Prefer for portable equipment where standby current <2 µA is mandatory and 0.2% factory accuracy is acceptable |
Compared with LT1009IPWE4, LM4040C25IDBZR trades adjustability and industrial tempco for compactness and cost, while REF3025AIDBZR prioritizes micropower operation and tighter initial accuracy over field calibration capability - making LT1009IPWE4 optimal for calibrated industrial systems needing ±5% tuning headroom.
Availability
LT1009IPWE4 is available at Aetrix Electronics and suitable for industrial power-supply monitors, 8-bit data acquisition systems, and current-loop transmitter designs requiring stable component supply across extended temperature ranges.
Supply support for LT1009IPWE4 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 company founded in 1930, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The LT1009IPWE4 belongs to TI's precision voltage reference product line, engineered specifically for industrial-grade shunt references requiring wide operating current, low tempco, and field-adjustable output in surface-mount packages.
FAQ
What is the maximum cathode current rating for LT1009IPWE4?
The LT1009IPWE4 supports up to 10 mA cathode current under recommended operating conditions. Exceeding this value risks exceeding the 150°C junction temperature limit, especially in TSSOP-8 due to its 149°C/W thermal resistance. Derating is required above 70°C ambient.
Does LT1009IPWE4 require an external capacitor for stability?
No, the LT1009IPWE4 is internally compensated and does not require an external capacitor for stability. Its design maintains phase margin across the full 400 µA–10 mA operating range without added capacitance - simplifying layout in space-constrained applications.
Can LT1009IPWE4 replace LM136-2.5 in existing designs?
Yes, LT1009IPWE4 is explicitly designed as a terminal-for-terminal replacement for LM136-2.5 in SOIC-8 and TSSOP-8 packages. Pinout, voltage rating, and current capability match directly - enabling drop-in substitution without PCB changes.
What is the function of the ADJ pin on LT1009IPWE4?
The ADJ pin on LT1009IPWE4 enables ±5% output voltage adjustment by connecting an external resistor divider between cathode and ground. With ADJ open, LT1009IPWE4 delivers nominal 2.5 V; adjusting ADJ shifts output linearly within the specified range to correct system-level errors.
Is LT1009IPWE4 qualified for automotive applications?
No, LT1009IPWE4 is rated for –40°C to 85°C operation and is not AEC-Q200 qualified. For automotive use, consider TI's TL431Q or REF5025-Q1, which meet automotive reliability and qualification standards - LT1009IPWE4 targets industrial and commercial systems only.
LT1009IPWE4 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
LT1009IPWE4 FAQ
1.How can I place an order for LT1009IPWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009IPWE4 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 LT1009IPWE4 reliable?
The price and inventory of LT1009IPWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009IPWE4 is usually 5 days.
3.What payment methods are accepted for LT1009IPWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009IPWE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009IPWE4?
LT1009IPWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009IPWE4 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 LT1009IPWE4?
For technical support, including LT1009IPWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009IPWE4 requirements.
6.How does Aetrix verify that LT1009IPWE4 is sourced from the original manufacturer or authorized distributors?
All LT1009IPWE4 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 LT1009IPWE4 meets industry standards.
7.What is the process for return or replacement of LT1009IPWE4?
All LT1009IPWE4 units undergo pre-shipment inspection (PSI). If there is an issue with LT1009IPWE4, 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 LT1009IPWE4 part is unused and in its original packaging.
Return procedure for LT1009IPWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009IPWE4 Tags
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