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Texas Instruments LT1009IPWR
- Part No.:
- LT1009IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LT1009IPWR.pdf
- Description:
- IC VREF SHUNT 0.4% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,772
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Product details
Overview
LT1009IPWR from Texas Instruments is a precision 2.5-V shunt voltage reference IC with ±10 mV initial tolerance (±0.4%), 20 ppm/°C max average temperature coefficient over –40°C to 85°C, 1.4 Ω max dynamic impedance at 1 mA, and adjustable output via ADJ pin (±5% range). It serves as a stable reference in ADC/DAC circuits, power-supply monitors, and digital voltmeters.
For engineers reviewing the LT1009IPWR datasheet, LT1009IPWR pinout, LT1009IPWR application, or LT1009IPWR equivalent, this page delivers verified electrical specs, TSSOP-8 package layout, real-world use cases, and two validated alternative parts - all grounded in TI's SLVS013N datasheet and official ordering documentation.
Technical Context
The LT1009IPWR operates as a three-terminal shunt reference: anode connects to system ground, cathode sinks current to set output voltage, and ADJ enables ±5% fine-tuning without external components. Its on-chip trimming eliminates need for external calibration while minimizing both initial error and αVZ drift.
It functions across 400 µA–10 mA cathode current, supports reverse-voltage operation up to 20 V, and maintains stability under capacitive loads typical of data acquisition systems. The device is not a series regulator but requires external current-setting resistor - a key distinction affecting PCB layout and thermal design.
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 ≤±25 mV absolute error in industrial environments. |
| Initial Tolerance | ±10 mV (±0.4%) in TSSOP-8 package - tighter than LM136-2.5 (±20 mV), reducing system-level calibration burden. |
| Temp Coefficient αVZ | 20–35 ppm/°C max - enables <±1.5 mV drift over full temperature range, critical for 12-bit+ measurement accuracy. |
| Dynamic Impedance ZZ | 1.4 Ω max at 1 mA - suppresses noise coupling and improves load regulation vs. older references like TL431. |
| Adjustment Range | ±5% via ADJ pin - allows trimming to compensate for PCB trace resistance or DAC offset without adding potentiometers. |
| Operating Current | 400 µA to 10 mA cathode current - supports low-power sensor nodes and high-current reference buffers alike. |
| Long-Term Drift | 20 ppm/khr at 25°C - predicts <±0.1% voltage shift over 10 years, supporting long-lifecycle industrial deployments. |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 6 | NC | No internal connection - must remain unconnected; floating or tied to ground per layout best practices. |
| 4 | Anode | Ground reference node - connects directly to system GND plane for lowest noise and thermal stability. |
| 5, 7 | Cathode | Current-sink output - ties to feedback node of regulator or ADC reference input; shared cathode pins reduce IR drop. |
| 8 | ADJ | Voltage-adjust terminal - applying 0.6 V to (VZ – 0.6 V) shifts output ±5%; open-circuit for nominal 2.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip laser trimming | Eliminates external trim network required by LM136-2.5, reducing BOM count and board area in space-constrained designs. |
| Terminal-for-terminal replacement for LM136-2.5 | Same pinout and electrical interface - enables drop-in upgrade path with no PCB revision in legacy 5-V systems. |
| Wide operating current range | 400 µA–10 mA operation allows use in ultra-low-power IoT sensors and high-accuracy lab equipment without redesign. |
| No external capacitor required | Stable with 0 pF load capacitance - avoids stability issues common with series references when driving multiplexed ADC inputs. |
| Low dynamic impedance | 1.4 Ω max minimizes voltage perturbation during fast current transients - essential for multi-channel simultaneous-sampling systems. |
Applications
| Industrial Process Monitoring | Portable Digital Multimeter |
|---|---|
Use Scenario: High-precision analog front-end for 4–20 mA loop-powered transmitters measuring pressure, temperature, or flow. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V for 16-bit sigma-delta ADC and DAC in isolated signal conditioning circuit. Use Value: 20 ppm/°C tempco and 1.4 Ω ZZ ensure <±0.02% full-scale error across –40°C to 85°C ambient, meeting SIL-2 functional safety requirements. |
Use Scenario: Battery-operated handheld DMM requiring accurate DC voltage and current measurement over 3.5-digit resolution. IC Role / Device Role / Timing Role: Primary reference for dual-slope integrator and auto-ranging attenuator network. Use Value: 400 µA minimum operating current extends battery life >200 hours; ±5% ADJ pin enables factory calibration to counter LCD driver supply ripple. |
| Programmable Logic Controller (PLC) Analog Input Module | Medical Patient Monitor Signal Chain |
Use Scenario: 8-channel isolated analog input card accepting ±10 V, 0–20 mA, and thermocouple signals in factory automation racks. IC Role / Device Role / Timing Role: Shared reference for multiple SAR ADCs and programmable gain instrumentation amplifiers. Use Value: Dual cathode pins (pins 5 & 7) lower effective series resistance, maintaining <0.1 LSB gain error across all channels during simultaneous sampling. |
Use Scenario: ECG/EEG front-end with anti-aliasing filter, PGA, and 24-bit delta-sigma ADC in Class II medical devices. IC Role / Device Role / Timing Role: Low-noise 2.5 V reference for ADC and bias generation in isolated analog domain. Use Value: 20 ppm/khr long-term drift meets IEC 60601-1 5-year calibration interval requirement; NC pins simplify creepage/clearance compliance. |
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, SOT-23-3, ±0.5% initial tol, 100 ppm/°C max tempco, 0.5 Ω ZZ, no ADJ pin | Lacks adjustment capability; smaller footprint but higher temp drift limits use in wide-temperature industrial settings | Choose for cost-sensitive, space-constrained designs where ±0.5% initial accuracy suffices and temperature range is limited. |
| TL431CDBVR | Adjustable 2.495–36 V, SOT-23-3, ±1%, 50 ppm/°C, 0.22 Ω ZZ, requires external resistors for 2.5 V setting | Needs two precision resistors to set 2.5 V; higher tempco increases system error budget vs. LT1009IPWR's trimmed core | Prefer when voltage flexibility is needed or when existing BOM already includes TL431; avoid if minimizing component count is critical. |
Compared with LM4040C25IDBZR and TL431CDBVR, the LT1009IPWR delivers superior temperature stability and integrated adjustability in a pin-compatible TSSOP-8 package - making it optimal for high-accuracy, production-ready industrial measurement systems where calibration overhead and long-term drift must be minimized.
Availability
LT1009IPWR is available at Aetrix Electronics and suitable for industrial process monitoring, portable test equipment, PLC analog input modules, and medical signal chain applications requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LT1009IPWR 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, specializing in analog ICs, embedded processors, and high-reliability power management solutions.
The LT1009IPWR belongs to TI's precision voltage reference product line, engineered specifically for industrial, test & measurement, and medical applications demanding low drift, high initial accuracy, and robust long-term stability.
FAQ
What is the maximum cathode current rating for the LT1009IPWR?
The LT1009IPWR supports a maximum cathode current of 10 mA per the Absolute Maximum Ratings table. Exceeding this value risks thermal overstress and accelerated long-term drift. At 10 mA, power dissipation reaches ~25 mW in typical 2.5 V operation - well within the TSSOP-8 package's 149 °C/W thermal resistance limit at 25°C ambient.
Can the LT1009IPWR replace the LM136-2.5 without PCB changes?
Yes, the LT1009IPWR is explicitly designed as a terminal-for-terminal replacement for the LM136-2.5 in TSSOP-8 (PW) packaging. Pin assignments, voltage rating, and current capability match, enabling direct substitution. However, verify that the existing current-setting resistor provides ≥400 µA minimum cathode current under worst-case conditions.
How does the ADJ pin on the LT1009IPWR function in practice?
The ADJ pin on the LT1009IPWR allows ±5% output voltage adjustment by applying a voltage between 0.6 V and (VZ – 0.6 V). When left open, the device delivers nominal 2.5 V. This feature enables system-level trimming to cancel out errors from op-amp input offset, PCB copper resistance, or sensor nonlinearity - all without external potentiometers or DACs.
What is the long-term stability specification for the LT1009IPWR?
The LT1009IPWR exhibits a long-term drift of 20 ppm per 1000 hours (20 ppm/khr) at 25°C and 1 mA cathode current. Extrapolated over 10 years (87,600 hours), this equates to approximately ±175 ppm (±0.44 mV) total drift - well within the ±10 mV initial tolerance band and suitable for applications requiring recalibration intervals exceeding five years.
Does the LT1009IPWR require an output capacitor for stability?
No, the LT1009IPWR is internally compensated and remains stable with zero output capacitance. Unlike many series references, it does not oscillate when driving capacitive loads such as ADC reference inputs or long PCB traces. Adding capacitance may even degrade transient response - TI's datasheet confirms stability down to 0 pF.
LT1009IPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
LT1009IPWR FAQ
1.How can I place an order for LT1009IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009IPWR 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 LT1009IPWR reliable?
The price and inventory of LT1009IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009IPWR is usually 5 days.
3.What payment methods are accepted for LT1009IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009IPWR?
LT1009IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009IPWR 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 LT1009IPWR?
For technical support, including LT1009IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009IPWR requirements.
6.How does Aetrix verify that LT1009IPWR is sourced from the original manufacturer or authorized distributors?
All LT1009IPWR 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 LT1009IPWR meets industry standards.
7.What is the process for return or replacement of LT1009IPWR?
All LT1009IPWR units undergo pre-shipment inspection (PSI). If there is an issue with LT1009IPWR, 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 LT1009IPWR part is unused and in its original packaging.
Return procedure for LT1009IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009IPWR Tags
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