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Texas Instruments LT1009IPWRG4
- Part No.:
- LT1009IPWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LT1009IPWRG4.pdf
- Description:
- IC VREF SHUNT 0.4% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,531
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Product details
Overview
LT1009IPWRG4 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 in 8-bit ADC/DAC circuits, power-supply monitors, and digital voltmeters.
For engineers reviewing the LT1009IPWRG4 datasheet, LT1009IPWRG4 pinout, LT1009IPWRG4 application, or LT1009IPWRG4 equivalent, key selection factors include its industrial-grade temperature range, no-trim operation with optional adjustment, low dynamic impedance for noise-sensitive systems, and compatibility with LM136-2.5 in existing designs requiring minimal layout change.
Technical Context
The LT1009IPWRG4 operates as a two-terminal shunt reference with a third ADJ terminal enabling ±5% output voltage trimming without degrading temperature coefficient. Its on-chip laser trimming achieves tight initial tolerance and minimizes αVZ across temperature.
It functions within 400 µA–10 mA cathode current, maintains stable 2.5 V output under varying load and supply conditions, and exhibits low 1/f and broadband noise-critical for high-resolution data conversion systems where reference drift directly impacts accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±10 mV at IZ = 1 mA - ensures system-level accuracy for 8-bit converters (LSB ≈ 10 mV at 2.5 V full scale) |
| Temp Coefficient | 20–35 ppm/°C (–40°C to 85°C) - contributes ≤0.875 mV drift over full range, suitable for industrial instrumentation |
| Dynamic Impedance | 0.6 Ω max at 1 mA - suppresses ripple coupling into reference node, improving PSRR in noisy supply environments |
| Adjustment Range | ±5% via ADJ pin - enables fine-tuning to cancel system gain errors without external trim network |
| Long-Term Drift | 20 ppm/khr at 25°C - supports 10+ year calibration stability in embedded monitoring applications |
| Operating Current | 400 µA to 10 mA - allows use with high-value bias resistors in low-power sensor interfaces |
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 - must be left floating or tied to GND per layout best practice; not usable as thermal pad |
| 4 | Anode | Connects to system ground - establishes reference return path; requires low-impedance GND plane |
| 5, 7 | Cathode | Main current sink node - carries full reference current; route with short, wide trace to minimize IR drop |
| 8 | ADJ | Voltage-adjust input - accepts 0.6 V to (VZ – 0.6 V); enables ±5% output tuning without affecting tempco |
Key Features
| Feature | Design Value |
|---|---|
| On-chip laser trimming | Eliminates need for external trim potentiometers, reducing BOM count and board space in portable instruments |
| Terminal-for-terminal LM136-2.5 replacement | Enables drop-in upgrade in legacy designs without PCB revision or schematic change |
| Wide cathode current range (400 µA–10 mA) | Supports both ultra-low-power sensor nodes and higher-current DAC reference buffers |
| Low 1/f noise (25 nV/√Hz typical) | Minimizes quantization noise floor in 16-bit+ SAR ADCs using buffered reference architectures |
| Stable operation without external capacitors | Reduces design risk in space-constrained applications where decoupling caps may be omitted |
Applications
| Industrial Power-Supply Monitor | Portable Digital Multimeter |
|---|---|
Use Scenario: Monitoring 5-V rail in programmable logic controller (PLC) backplane to trigger undervoltage lockout at 4.75 V. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5-V threshold for comparator input; cathode current sourced from monitored rail via series resistor. Use Value: ±10 mV initial tolerance ensures trip point accuracy within 0.2%, eliminating field calibration during PLC commissioning. | Use Scenario: Reference for dual-slope ADC in handheld DMM measuring 0–200 mV DC with 100-µV resolution. IC Role / Device Role / Timing Role: Precision 2.5-V shunt reference supplying known voltage to integrator capacitor; ADJ pin trimmed to cancel op-amp offset error. Use Value: 20 ppm/°C tempco limits reading drift to <0.05% over 0–50°C operating range, meeting Class II accuracy requirements. |
| 8-Bit Microcontroller ADC Reference | Current-Loop Transmitter Calibration |
Use Scenario: Providing reference to internal 8-bit ADC of MSP430F5xx in battery-powered environmental sensor node. IC Role / Device Role / Timing Role: Low-current shunt reference biased at 400 µA to extend battery life; ADJ pin unused, relying on factory trim. Use Value: 400 µA minimum operating current enables >10-year operation on CR2032 coin cell when sampling once per minute. | Use Scenario: Calibrating 4–20 mA transmitter output stage using precision DAC feedback loop in process automation module. IC Role / Device Role / Timing Role: Stable 2.5-V reference driving DAC's VREF input; ADJ pin adjusted to match master calibration standard within 0.05%. Use Value: ±5% adjustability compensates for DAC INL error and PCB trace resistance, achieving ±0.1% full-scale accuracy post-calibration. |
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, 100 ppm/°C max tempco, SOT-23-3 package, 60 µA min cathode current | Higher tempco and looser tolerance limit use in high-accuracy metrology; smaller footprint suits ultra-compact layouts | Select when board space is critical and ±0.5% system accuracy suffices; avoid for precision ADC references |
| TL431CDBVR | Adjustable 2.495 V reference, 2% initial tolerance, 50 ppm/°C tempco, SOT-23-5, requires external resistors for 2.5 V setting | Needs two external resistors and has higher tempco - introduces additional error sources and layout complexity | Choose only if cost is primary constraint and system can tolerate ≥15 mV reference error over temperature |
Compared with LM4040C25IDBZR and TL431CDBVR, the LT1009IPWRG4 delivers superior temperature stability and tighter initial tolerance in an industry-standard TSSOP-8, making it optimal for applications demanding long-term accuracy without manual calibration.
Availability
LT1009IPWRG4 is available at Aetrix Electronics and suitable for industrial power-monitoring systems, portable test equipment, microcontroller-based sensor nodes, and 4–20 mA transmitter calibration requiring stable component supply across extended temperature ranges.
Supply support for LT1009IPWRG4 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 specializing in analog, embedded processing, and connectivity technologies, with leadership in precision analog ICs since the 1980s.
The LT1009IPWRG4 belongs to TI's precision voltage reference product line, engineered for industrial and instrumentation applications requiring low drift, high stability, and robust performance across –40°C to 85°C.
FAQ
What is the maximum cathode current rating for the LT1009IPWRG4?
The LT1009IPWRG4 supports a maximum cathode current of 20 mA under absolute maximum ratings, but its recommended operating range is 400 µA to 10 mA. Operating above 10 mA increases self-heating and may degrade temperature coefficient performance; sustained operation near 20 mA risks exceeding thermal limits in TSSOP-8 package without heatsinking.
Can the LT1009IPWRG4 replace the LM136-2.5 without circuit modifications?
Yes, the LT1009IPWRG4 is explicitly designed as a terminal-for-terminal replacement for the LM136-2.5 in SOIC-8 and TSSOP-8 packages. Pinout, voltage rating, and electrical behavior match closely - no schematic or layout changes are required, though users should verify that existing bias resistor values deliver ≥400 µA cathode current at minimum operating voltage.
Does the ADJ pin on the LT1009IPWRG4 require external components to set nominal 2.5 V output?
No - the LT1009IPWRG4 delivers 2.5 V with ADJ pin left open (unconnected). The ADJ pin is optional and used only when ±5% adjustment is needed to compensate for system-level errors; connecting it to GND or VZ enables trimming, but default operation requires no external components.
What is the thermal resistance (θJA) of the LT1009IPWRG4 in TSSOP-8 package?
The LT1009IPWRG4 in TSSOP-8 (PW) package has a junction-to-ambient thermal resistance (θJA) of 149°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with added copper area or thermal vias beneath the exposed pad (if present) - though the PW package lacks an exposed thermal pad.
Is the LT1009IPWRG4 suitable for use in automotive applications?
No - the LT1009IPWRG4 is characterized for –40°C to +85°C operation and is not AEC-Q200 qualified. While its temperature range overlaps with some automotive cabin applications, TI does not specify or guarantee performance under automotive stress tests (e.g., temperature cycling, vibration, ESD). For automotive use, consider AEC-Q200-qualified alternatives like the REF5025QDRQ1.
LT1009IPWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
LT1009IPWRG4 FAQ
1.How can I place an order for LT1009IPWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009IPWRG4 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 LT1009IPWRG4 reliable?
The price and inventory of LT1009IPWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009IPWRG4 is usually 5 days.
3.What payment methods are accepted for LT1009IPWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009IPWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009IPWRG4?
LT1009IPWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009IPWRG4 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 LT1009IPWRG4?
For technical support, including LT1009IPWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009IPWRG4 requirements.
6.How does Aetrix verify that LT1009IPWRG4 is sourced from the original manufacturer or authorized distributors?
All LT1009IPWRG4 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 LT1009IPWRG4 meets industry standards.
7.What is the process for return or replacement of LT1009IPWRG4?
All LT1009IPWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LT1009IPWRG4, 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 LT1009IPWRG4 part is unused and in its original packaging.
Return procedure for LT1009IPWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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