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Texas Instruments TL1431CDRE4
- Part No.:
- TL1431CDRE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL1431CDRE4.pdf
- Description:
- IC VREF SHUNT ADJ 0.4% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,506
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Product details
Overview
TL1431CDRE4 from Texas Instruments is a precision programmable shunt voltage reference IC with 0.4% initial voltage tolerance at 25°C, 2.500 V nominal reference voltage (±10 mV), 0.2 Ω typical output impedance, and adjustable output voltage range from 2.5 V to 36 V via external resistors. It operates as a Zener replacement or error amplifier in secondary-side regulation of flyback SMPSs.
For engineers reviewing the TL1431CDRE4 datasheet, TL1431CDRE4 pinout, TL1431CDRE4 application, or TL1431CDRE4 equivalent, this page delivers verified electrical specs, SOIC-8 package mapping, thermal performance data, functional mode distinctions (open-loop comparator vs. closed-loop regulator), and validated alternative parts for industrial power supply design and voltage monitoring systems.
Technical Context
The TL1431CDRE4 integrates a 2.5 V bandgap reference and high-gain transconductance amplifier driving an internal NPN Darlington sink stage. Its open-loop operation enables precise voltage-level comparison with integrated reference, while closed-loop feedback (REF–CATHODE) configures it as a stable shunt regulator with <500 ns turn-on time.
It requires ≥1 mA cathode current (IKA) for regulation and draws only 1.5–2.5 µA reference input current (II(ref)). Thermal stability is specified over 0°C to 70°C (commercial grade), with reference voltage deviation ≤20 mV across that range and temperature coefficient ≤80 ppm/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±10 mV at 25°C - sets precise regulation threshold for feedback networks |
| Initial Tolerance | 0.4% at 25°C - enables high-accuracy output programming without trimming |
| Output Impedance | 0.2 Ω typical - ensures minimal load-induced voltage shift under 1–100 mA cathode current |
| Cathode Voltage Range | 2.5 V to 36 V - supports wide-range adjustable regulation in isolated DC/DC converters |
| Turn-on Time | 500 ns - provides fast response for overvoltage clamping and transient protection |
| Reference Input Current | 1.5–2.5 µA at 25°C - minimizes resistor-divider loading error in precision feedback paths |
| Operating Temperature | 0°C to 70°C - commercial-grade thermal rating suitable for non-automotive embedded power rails |
Pinout & Package
TL1431CDRE4 is housed in an 8-pin SOIC (D package), 3.90 mm × 4.90 mm body size, with internally connected ANODE pins (pins 2, 3, 6, 7) for low-inductance ground return.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Current-sink output terminal | Carries regulated cathode current (1–100 mA); voltage at this node is controlled by REF feedback |
| ANODE (Pins 2, 3, 6, 7) | Common ground reference | Internally tied together; must be connected to system ground or return path for stable regulation |
| REF (Pin 8) | Reference input sensing node | Compares external voltage divider to internal 2.5 V reference; requires ≥5 µA bias current |
| NC (Pins 4, 5) | No internal connection | Not bonded; must remain unconnected to avoid parasitic coupling or ESD path disruption |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage | 2.5 V to 36 V using two external resistors - eliminates need for multiple fixed-voltage references |
| Low Output Impedance | 0.2 Ω typical - maintains regulation accuracy even with dynamic load current changes |
| Fast Turn-on Response | 500 ns - enables real-time overvoltage detection and clamping in safety-critical power stages |
| Zener Diode Replacement | Replaces discrete Zeners with superior thermal stability and tighter initial tolerance |
| Internal Compensation | Stable without external capacitor - simplifies layout and reduces BOM count in space-constrained designs |
Applications
| Secondary-Side Regulation | Zener Diode Replacement |
|---|---|
Use Scenario: Isolated flyback converter where primary-side controller lacks direct output voltage sensing. IC Role / Device Role / Timing Role: Shunt regulator providing feedback signal to optocoupler, enabling precise secondary-side voltage control. Use Value: Achieves ±1% output regulation across line/load/temperature without primary-side compensation complexity. |
Use Scenario: Voltage clamping or reference generation in legacy analog circuits originally designed for 2.5–36 V Zener diodes. IC Role / Device Role / Timing Role: Precision programmable shunt reference replacing discrete Zener + resistor networks. Use Value: Improves thermal drift from ±100 ppm/°C (Zener) to ≤80 ppm/°C and eliminates part-to-part tolerance stacking. |
| Voltage Monitoring | Comparator with Integrated Reference |
Use Scenario: Overvoltage protection circuit monitoring 12 V or 24 V rail in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Threshold detector comparing monitored rail to programmable reference voltage. Use Value: Enables accurate trip point setting (e.g., 12.6 V ±0.05 V) without external reference IC or trimming. |
Use Scenario: Level-shifting comparator in battery management systems detecting cell voltage thresholds. IC Role / Device Role / Timing Role: Open-loop comparator with built-in 2.5 V reference, driving MOSFET gate or fault latch. Use Value: Reduces component count by integrating reference and comparator function-no external reference required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | Same 2.5 V reference, 0.5% initial tolerance, SOIC-8, but rated for 0°C to 70°C with higher VI(dev) (≤25 mV) | Suitable for cost-sensitive designs where 0.5% tolerance is acceptable and thermal drift margin is relaxed | Select TL431ACDR if budget constraints outweigh need for 0.4% tolerance and tighter thermal stability |
| TL1431QDREP | Identical electrical specs but qualified for –40°C to 125°C automotive temperature range and AEC-Q100 Grade 2 | Required for under-hood automotive power supplies, EV charging interfaces, or industrial equipment operating beyond 70°C | Choose TL1431QDREP when extended temperature operation or automotive qualification is mandatory |
Compared with TL1431CDRE4, TL431ACDR trades 0.1% initial tolerance and slightly higher thermal drift for lower unit cost, while TL1431QDREP retains identical precision but adds automotive-grade reliability and extended thermal range-neither is pin-compatible without verifying PCB layout compatibility for thermal pad or creepage requirements.
Availability
TL1431CDRE4 is available at Aetrix Electronics and suitable for industrial power supplies, telecom DC/DC converters, and test equipment requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for TL1431CDRE4 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision reference and power IC design.
The TL1431 family was developed to deliver cost-effective, high-accuracy shunt references for isolated power conversion and voltage supervision, targeting industrial, computing, and communications infrastructure applications.
FAQ
What is the maximum cathode voltage supported by TL1431CDRE4?
The TL1431CDRE4 supports a maximum cathode voltage (VKA) of 36 V under recommended operating conditions. Absolute maximum rating is 37 V, but sustained operation above 36 V risks parametric degradation or reliability loss. This limit defines its use in medium-voltage isolated SMPS outputs and industrial 24 V/48 V systems.
Can TL1431CDRE4 operate without an external capacitor between CATHODE and ANODE?
Yes, TL1431CDRE4 is internally compensated and remains stable without an external capacitor between CATHODE and ANODE. However, capacitive loads up to 1 nF may be added for improved transient response-stability boundaries must be checked per Figure 5-12 in the datasheet to avoid oscillation.
What is the minimum cathode current required for regulation in TL1431CDRE4?
The TL1431CDRE4 requires a minimum cathode current (Imin) of 0.45 mA at 25°C to maintain regulation. At full temperature range (0°C to 70°C), this rises to 1 mA. Below this threshold, the device exits linear regulation and behaves as an open-loop comparator or high-impedance node.
How does the REF pin current affect accuracy in TL1431CDRE4 feedback networks?
The REF pin draws 1.5–2.5 µA (25°C), which flows through the upper resistor (R1) in standard feedback dividers. This introduces a voltage error equal to II(ref) × R1-e.g., 2.5 µA × 10 kΩ = 25 mV offset. To minimize impact, keep R1 ≤ 10 kΩ or use lower-value dividers with precision resistors.
Is TL1431CDRE4 pin-compatible with TL431 series devices?
TL1431CDRE4 uses the same SOIC-8 pinout as TL431ACDR and TL431BIDR, with identical CATHODE (Pin 1), ANODE (Pins 2,3,6,7), and REF (Pin 8) assignments. However, differences in reference tolerance, thermal drift, and output impedance mean functional substitution requires validation of system-level accuracy and stability margins.
TL1431CDRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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-SOIC
TL1431CDRE4 FAQ
1.How can I place an order for TL1431CDRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL1431CDRE4 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 TL1431CDRE4 reliable?
The price and inventory of TL1431CDRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL1431CDRE4 is usually 5 days.
3.What payment methods are accepted for TL1431CDRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL1431CDRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL1431CDRE4?
TL1431CDRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL1431CDRE4 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 TL1431CDRE4?
For technical support, including TL1431CDRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL1431CDRE4 requirements.
6.How does Aetrix verify that TL1431CDRE4 is sourced from the original manufacturer or authorized distributors?
All TL1431CDRE4 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 TL1431CDRE4 meets industry standards.
7.What is the process for return or replacement of TL1431CDRE4?
All TL1431CDRE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL1431CDRE4, 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 TL1431CDRE4 part is unused and in its original packaging.
Return procedure for TL1431CDRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL1431CDRE4 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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