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Texas Instruments LT1009CPW
- Part No.:
- LT1009CPW
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LT1009CPW.pdf
- Description:
- IC VREF SHUNT 0.4% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,195
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Product details
Overview
LT1009CPW from Texas Instruments is a precision 2.5-V shunt voltage reference IC in TSSOP-8 package, featuring ±10 mV initial tolerance (±0.4%), 15 ppm/°C max average temperature coefficient over 0°C to 70°C, 0.6 Ω max dynamic impedance at 1 mA, and adjustable output via ADJ pin (±5% range). It serves as a stable reference in 5-V system monitoring, 8-bit ADC/DAC circuits, and current-loop transmitters.
For engineers reviewing the LT1009CPW datasheet, LT1009CPW pinout, LT1009CPW application, or LT1009CPW equivalent, key selection considerations include its TSSOP-8 thermal performance (θJA = 149°C/W), no-trim operation with optional adjustment, compatibility with LM136-2.5 layouts, and guaranteed stability across 400 µA–10 mA cathode current.
Technical Context
The LT1009CPW implements a bandgap-derived 2.5-V reference core trimmed on-chip for minimal initial error and low αVZ. Its three-terminal architecture (ANODE, CATHODE, ADJ) enables both fixed and adjustable configurations without external components.
It operates as a two-quadrant shunt regulator: sinking current when VOUT exceeds 2.5 V, and maintaining regulation down to 400 µA cathode current. The ADJ terminal allows ±5% fine-tuning by injecting current into or sinking from the internal divider node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.485 V to 2.515 V at IZ = 1 mA (D/PW package, full 0°C–70°C range); ensures ≤0.4% total error budget in precision 5-V rail sensing. |
| Initial Tolerance | ±10 mV max (±0.4%) in PW package; eliminates need for post-assembly trimming in production test flows. |
| Temp Coefficient | 15 ppm/°C max average (0°C to 70°C); contributes <1.05 mV drift over industrial ambient range. |
| Dynamic Impedance | 0.6 Ω max at IZ = 1 mA; maintains <0.6 mV output shift under 1-mA load transients. |
| Adjustment Range | ±5% via ADJ pin; supports system-level calibration to cancel DAC gain error or sensor offset. |
| Operating Current | 400 µA to 10 mA cathode current; enables use with high-value bias resistors in low-power 3.3-V systems. |
| Thermal Impedance | 149°C/W (θJA, PW package); limits power dissipation to 67 mW at 70°C ambient for safe continuous operation. |
Pinout & Package
TSSOP-8 package (PW), 3.0 mm × 4.4 mm × 1.2 mm height, moisture sensitivity level 1, lead finish NiPdAu.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 6 | NC | No internal connection; must be left unconnected or tied to GND per layout best practice. |
| 4 | ANODE | Connects to system ground or low-impedance return path; forms reference current sink return node. |
| 5, 7 | CATHODE | Dual cathode pins share current path to reference output node; reduces IR drop and improves regulation accuracy. |
| 8 | ADJ | Adjust terminal: sourcing/sinking current here shifts VREF ±5%; open-circuit for nominal 2.5 V operation. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip trimming | Eliminates external laser trim or potentiometer, reducing BOM count and assembly cost in volume production. |
| Terminal-for-terminal LM136-2.5 replacement | Enables drop-in upgrade path without PCB redesign-same pinout, same footprint, improved tempco and impedance. |
| Wide cathode current range | Supports biasing from 400 µA (ultra-low-power sensors) up to 10 mA (high-speed DAC references) with stable regulation. |
| No external capacitor required | Stable with capacitive loads up to 10 µF; simplifies layout in space-constrained applications like portable instrumentation. |
| Low long-term drift | 20 ppm/khr typical; ensures reference stability over 10+ years in metering and industrial control deployments. |
Applications
| 5-V System Reference | 8-Bit Data Converter Reference |
|---|---|
Use Scenario: Providing stable 2.5-V reference for microcontroller ADC inputs in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Shunt reference establishing precise scaling voltage for 0–5 V input range digitization. Use Value: Enables ±1 LSB accuracy across temperature with no calibration, leveraging 15 ppm/°C tempco and 0.6 Ω impedance. |
Use Scenario: Supplying reference voltage to 8-bit DACs in programmable logic controller (PLC) analog output stages. IC Role / Device Role / Timing Role: Precision voltage source defining full-scale output of current/voltage output channels. Use Value: Guarantees monotonicity and linearity compliance by holding reference error below 0.4% over operating life. |
| Power-Supply Monitor | Current-Loop Transmitter |
Use Scenario: Monitoring 5-V rail integrity in embedded networking equipment using comparator-based brownout detection. IC Role / Device Role / Timing Role: Stable threshold generator for undervoltage lockout (UVLO) circuitry. Use Value: Delivers repeatable trip point with <1 mV hysteresis contribution, critical for reliable system reset sequencing. |
Use Scenario: Setting reference voltage for 4–20 mA transmitter front-ends in process automation field devices. IC Role / Device Role / Timing Role: Primary voltage standard for current-setting resistor network in HART-compatible transmitters. Use Value: Maintains loop accuracy to ±0.1% over temperature and time, meeting SIL-2 functional safety requirements. |
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 tempco (30 ppm/°C), no ADJ pin, ±1% initial tolerance, TO-92 only | Limited to fixed-output, lower-accuracy applications; incompatible with TSSOP layouts | Select LM136-2.5 only for legacy designs where footprint and cost outweigh precision needs. |
| TL431ACDBVR | 2.495 V nominal, adjustable via resistor divider, SOT-23-5, 0.2 Ω impedance, 50 ppm/°C tempco | Better suited for feedback loops in switching regulators; less stable for precision measurement | Choose TL431ACDBVR when integrating into optocoupler feedback paths-not for metrology-grade references. |
Compared with LM136-2.5 and TL431ACDBVR, the LT1009CPW delivers superior temperature stability and tighter initial tolerance in a surface-mount package, making it optimal for measurement-critical roles where long-term drift and thermal error must be minimized.
Availability
LT1009CPW is available at Aetrix Electronics and suitable for 5-V system references, 8-bit data converter references, and power-supply monitors requiring stable component supply with consistent parametric performance across production lots.
Supply support for LT1009CPW 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 and embedded processing technologies with broad industrial, automotive, and communications product portfolios.
The LT1009 series belongs to TI's precision voltage reference product line, designed specifically for applications demanding low-drift, low-impedance shunt references in space-constrained and thermally challenging environments.
FAQ
What is the maximum cathode current rating for the LT1009CPW?
The LT1009CPW supports a maximum cathode current of 10 mA under recommended operating conditions. Exceeding this value risks exceeding the device's 150°C junction temperature limit, especially given its 149°C/W thermal resistance in the TSSOP-8 package. Derating is required above 70°C ambient.
Can the LT1009CPW replace the LM136-2.5 without PCB changes?
Yes-the LT1009CPW in TSSOP-8 (PW) package is explicitly documented as a terminal-for-terminal replacement for the LM136-2.5 in SOIC-8 (D) package. Both share identical pin numbering and function mapping, enabling direct substitution in existing layouts with no trace modifications required.
Does the LT1009CPW require an external capacitor for stability?
No-the LT1009CPW is internally compensated and remains stable with capacitive loads up to 10 µF. This eliminates the need for external bypass capacitors in most applications, simplifying design and reducing board area in compact instrumentation and sensor signal chains.
What is the purpose of the ADJ pin on the LT1009CPW?
The ADJ pin on the LT1009CPW allows ±5% adjustment of the reference voltage by sourcing or sinking current-enabling system-level calibration to compensate for downstream component errors. When left open, the LT1009CPW delivers its nominal 2.5-V output with no adjustment needed.
How does the LT1009CPW perform over temperature compared to the LT1009CLP?
The LT1009CPW (0°C to 70°C) and LT1009CLP (same temperature range) share identical electrical specifications including 15 ppm/°C max tempco and ±10 mV initial tolerance. The difference lies solely in package form factor-TSSOP-8 vs. TO-92-with LT1009CPW offering superior thermal dissipation and surface-mount compatibility.
LT1009CPW 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:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 400 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
LT1009CPW FAQ
1.How can I place an order for LT1009CPW through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009CPW 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 LT1009CPW reliable?
The price and inventory of LT1009CPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009CPW is usually 5 days.
3.What payment methods are accepted for LT1009CPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009CPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009CPW?
LT1009CPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009CPW 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 LT1009CPW?
For technical support, including LT1009CPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009CPW requirements.
6.How does Aetrix verify that LT1009CPW is sourced from the original manufacturer or authorized distributors?
All LT1009CPW 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 LT1009CPW meets industry standards.
7.What is the process for return or replacement of LT1009CPW?
All LT1009CPW units undergo pre-shipment inspection (PSI). If there is an issue with LT1009CPW, 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 LT1009CPW part is unused and in its original packaging.
Return procedure for LT1009CPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009CPW Tags
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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