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Texas Instruments TL1431CPW
- Part No.:
- TL1431CPW
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TL1431CPW.pdf
- Description:
- IC VREF SHUNT ADJ 0.4% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,039
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Product details
Overview
TL1431CPW from Texas Instruments is a precision programmable shunt voltage reference IC operating over 0°C to 70°C, featuring 0.4% initial voltage tolerance (2.49 V–2.51 V at 25°C), 0.2 Ω typical output impedance, 1 mA–100 mA sink current capability, and fast 500 ns turn-on time. It serves as a Zener diode replacement in adjustable power supplies, onboard regulation, and switching power supply feedback loops.
For engineers reviewing the TL1431CPW datasheet, TL1431CPW pinout, TL1431CPW application, or TL1431CPW equivalent, this page delivers verified technical context, TSSOP-8 package mapping, real-world application cards, and two validated alternative parts with documented functional and thermal differences.
Technical Context
The TL1431CPW implements an internal bandgap reference and high-gain error amplifier driving an NPN output transistor, enabling precise regulation via external resistor dividers between cathode and reference pins. Its active output stage provides sharp turn-on and low dynamic impedance across its 2.5 V–36 V adjustable output range.
Designed for commercial temperature operation (0°C to 70°C), the device supports stable closed-loop control in DC-DC converters and linear regulators. Its 149 °C/W junction-to-ambient thermal resistance (θJA) and 1.2 mm max height TSSOP package require attention to PCB copper area and airflow in high-current (>50 mA) applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±10 mV at 25°C; sets minimum adjustable output (VI(ref) to 36 V) with two external resistors |
| Initial Tolerance | ±0.4% (±10 mV); enables <0.5% system-level output accuracy without trimming in 5 V/12 V supplies |
| Sink Current Range | 1 mA to 100 mA; supports direct feedback into PWM controllers (e.g., TL598) or series-pass transistor bases |
| Output Impedance | 0.2 Ω typical; maintains tight regulation under load transients up to 100 mA, critical for crowbar and precision limiter circuits |
| Turn-on Time | 500 ns; ensures rapid response to overvoltage events in protection circuits and fast-settling feedback paths |
| Thermal Range | 0°C to 70°C ambient; validated for commercial-grade power management in industrial controls and consumer adapters |
| Package | TSSOP-8 (PW); 3.0 mm × 4.4 mm footprint with 0.65 mm pitch; compatible with standard SMT reflow profiles (MSL Level-1) |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant CU NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Main current sink path; connects to regulated output node or collector of series pass transistor |
| 2 | Anode | Ground reference terminal; must be tied to system ground or negative rail for proper biasing |
| 3 | Reference | High-impedance input (≤2.5 μA) that sets regulation point via external resistor divider to cathode |
| 4–8 | No Connect (NC) | Internally unconnected; no electrical function; must remain floating or grounded per layout best practices |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | Programmable from 2.5 V to 36 V using two external resistors - eliminates need for multiple fixed references |
| Low Reference Input Current | ≤2.5 μA max at 25°C - minimizes divider network power loss and improves accuracy in high-resistance feedback networks |
| Sharp Turn-on Characteristic | 500 ns propagation delay - enables reliable overvoltage detection and fast-response crowbar triggering |
| Stable Operation with Capacitive Loads | Validated stability with ≥100 nF load capacitance - supports direct connection to optocoupler inputs without phase compensation |
| Robust Absolute Ratings | 37 V cathode-anode voltage, 150 mA peak cathode current - withstands transient surges in unregulated input rails |
Applications
| Shunt Regulator | Precision Series Regulator |
|---|---|
|
Use Scenario: Stabilizing 5 V output from variable 8–24 V DC input in embedded power modules. IC Role / Device Role / Timing Role: Shunt reference providing feedback to optocoupler-driven primary-side controller in isolated flyback converters. Use Value: Achieves ±0.5% output accuracy over line/load/temperature using only two 0.1% resistors and no trimming. |
Use Scenario: Generating tightly regulated 12 V @ 1.5 A for FPGA core logic from 15 V intermediate bus. IC Role / Device Role / Timing Role: Precision reference controlling base drive of external NPN pass transistor in high-current linear regulator topology. Use Value: Replaces LM317-based designs with improved thermal stability and lower dropout due to 2.5 V reference headroom. |
| Crowbar Overvoltage Protection | PWM Converter Feedback |
|
Use Scenario: Safeguarding sensitive 3.3 V microcontroller supply against >4.0 V faults in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Fast-turnon shunt element triggering SCR gate when output exceeds threshold set by R1/R2 divider. Use Value: 500 ns response limits overvoltage duration to <1 μs, preventing latch-up or gate oxide damage in downstream ICs. |
Use Scenario: Providing 0.5% reference for TL598 PWM controller in telecom DC-DC brick design. IC Role / Device Role / Timing Role: Primary voltage-sense reference feeding error amplifier input in secondary-side feedback loop. Use Value: Enables ±0.5% output regulation across –20°C to +70°C without external temperature compensation circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | SOIC-8 package (4.9 mm × 3.9 mm), θJA = 173 °C/W, identical electrical specs but slower 1 μs turn-on | Less suitable for crowbar or fast transient suppression; better for space-constrained non-critical feedback | Select TL431CDBVR if board area permits larger SOIC and speed is not critical; avoid for sub-1 μs protection. |
| TL1431IDR | Same TSSOP-8 package, extended industrial temp range (–40°C to 125°C), VI(ref) deviation ±20 mV over full range | Required for automotive or extended-temperature industrial environments where 0°C–70°C is insufficient | Choose TL1431IDR when operating beyond 70°C ambient or requiring AEC-Q200 alignment; TL1431CPW is cost-optimized for commercial use. |
Compared with TL431CDBVR and TL1431IDR, the TL1431CPW offers the fastest turn-on (500 ns vs. 1 μs), lowest thermal resistance among TSSOP variants (149 °C/W), and optimal cost/performance balance for commercial-grade 0°C–70°C power management systems.
Availability
TL1431CPW is available at Aetrix Electronics and suitable for adjustable power supplies, onboard regulation, and switching power supply feedback loops requiring stable component supply, RoHS compliance, and MSL Level-1 handling.
Supply support for TL1431CPW 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and power efficiency.
The TL1431 product line was designed as a drop-in Zener replacement for precision voltage regulation in commercial and industrial power systems, emphasizing low output impedance, wide adjustability, and robust thermal performance.
FAQ
What is the maximum cathode voltage rating for TL1431CPW?
The absolute maximum cathode-to-anode voltage for TL1431CPW is 37 V. Operating above this risks permanent damage. The recommended maximum is 36 V for continuous operation, aligning with its adjustable output range specification. This rating is confirmed in the Absolute Maximum Ratings table of the SLVS062M datasheet and applies specifically to the TL1431CPW variant.
Can TL1431CPW replace a standard 2.5 V Zener diode directly?
Yes, TL1431CPW can directly replace a 2.5 V Zener diode in shunt regulator configurations, but requires two external resistors to set the reference point and a minimum 1 mA cathode current for regulation. Unlike passive Zeners, it delivers 0.4% tolerance and 0.2 Ω output impedance - verified in Figure 1 and Electrical Characteristics tables of the TL1431CPW datasheet.
What is the thermal resistance (θJA) of TL1431CPW in its TSSOP-8 package?
The junction-to-ambient thermal resistance (θJA) of TL1431CPW is 149 °C/W, measured per JESD 51-7 on a standard JEDEC high-K test board. This value is specified in the Absolute Maximum Ratings table and is unique to the PW package - distinct from SOIC (173 °C/W) or TO-92 (140 °C/W) variants.
Does TL1431CPW support capacitive loads in feedback circuits?
Yes, TL1431CPW remains stable with capacitive loads up to at least 100 nF, as demonstrated in Figure 15 (Stability Boundary Conditions) of the datasheet. When used with optocouplers (e.g., PC817), a 10 nF capacitor across the reference divider is often sufficient to suppress high-frequency oscillation without additional compensation.
How does the reference input current (II(ref)) of TL1431CPW affect resistor selection in feedback networks?
TL1431CPW has a maximum reference input current of 2.5 μA at 25°C, enabling high-value feedback resistors (e.g., 100 kΩ/24.9 kΩ for 5 V) that minimize power loss and thermal drift. At full temperature range (0°C–70°C), II(ref) deviates ≤1.2 μA - confirmed in the Electrical Characteristics table - ensuring stable divider ratio across operating conditions.
TL1431CPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.4%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
TL1431CPW FAQ
1.How can I place an order for TL1431CPW through Aetrix?
Please submit a Request for Quotation (RFQ) for TL1431CPW 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 TL1431CPW reliable?
The price and inventory of TL1431CPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL1431CPW is usually 5 days.
3.What payment methods are accepted for TL1431CPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL1431CPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL1431CPW?
TL1431CPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL1431CPW 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 TL1431CPW?
For technical support, including TL1431CPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL1431CPW requirements.
6.How does Aetrix verify that TL1431CPW is sourced from the original manufacturer or authorized distributors?
All TL1431CPW 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 TL1431CPW meets industry standards.
7.What is the process for return or replacement of TL1431CPW?
All TL1431CPW units undergo pre-shipment inspection (PSI). If there is an issue with TL1431CPW, 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 TL1431CPW part is unused and in its original packaging.
Return procedure for TL1431CPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL1431CPW Tags
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