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Texas Instruments TLV431BCDBVTE4
- Part No.:
- TLV431BCDBVTE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLV431BCDBVTE4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,615
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Product details
Overview
TLV431BCDBVTE4 from Texas Instruments is a low-voltage adjustable precision shunt regulator IC used as a 1.24V reference and error amplifier in isolated feedback loops. It delivers 0.5% initial reference voltage tolerance at 25°C, 0.25Ω typical dynamic impedance, and operates with cathode voltages from 1.24V to 6V and cathode currents as low as 55µA. It is commonly deployed in secondary-side regulation of 3.3V flyback SMPSs.
For engineers reviewing the TLV431BCDBVTE4 datasheet, TLV431BCDBVTE4 pinout, TLV431BCDBVTE4 application, or TLV431BCDBVTE4 equivalent, key selection considerations include its SC-70 (DCK) package footprint, 0.5% VREF accuracy, ultra-low IK(min) of 55µA, thermal stability across –40°C to 85°C (TLV431BI grade), and compatibility with optocoupler-based isolated feedback topologies.
Technical Context
The TLV431BCDBVTE4 implements a bandgap-referenced transconductance amplifier driving an internal Darlington sink output stage. Its closed-loop operation relies on resistive feedback between cathode and reference pins to regulate output voltage precisely to VREF × (1 + R1/R2) + Iref × R1. Open-loop use leverages its high gain (>60 dB) and integrated 1.24V reference for comparator functions without external references.
It achieves stable regulation without mandatory output capacitance due to internal compensation, though phase margin vs. capacitive load is characterized up to 10nF. The device's 4mV VREF drift over 0°C to 70°C and 6mV over –40°C to 85°C reflects its suitability for industrial-grade power monitoring and precision biasing where low-voltage headroom is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF @ 25°C | 1.24 V ±0.5% - sets minimum regulation voltage and defines feedback ratio accuracy in shunt regulator configurations |
| VKA Range | 1.24 V to 6 V - enables adjustable output regulation down to sub-2V rails, critical for 3.3V/2.5V system supplies |
| IK(min) | 55 µA typical - allows regulation with minimal bias current, reducing standby power in energy-sensitive designs |
| |zKA| | 0.25 Ω typical - ensures tight load regulation and low output impedance for stable error amplification |
| VREF Drift (–40°C to 85°C) | 6 mV - guarantees ≤0.5% total variation over full industrial temperature range, supporting reliable overvoltage monitoring |
| Iref | 0.1 µA to 0.5 µA - low reference pin current minimizes resistor-divider loading errors in high-impedance feedback networks |
| Package | DCK (SC-70, 6-pin) - 2.0 mm × 1.5 mm footprint, 40% smaller than SOT-23-3, optimized for space-constrained PCB layouts |
Pinout & Package
DCK (SC-70) package: 6-pin ultra-small outline surface-mount package with 0.65 mm pitch, 2.0 mm × 1.5 mm body size, and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input/output | Sinks regulated current; connects to supply rail or optocoupler LED anode in isolated feedback circuits |
| REF (Pin 3) | Reference input | High-impedance node sensing feedback voltage; must be biased with ≥0.1 µA to maintain regulation |
| ANODE (Pin 6) | Common return path | Typically grounded; serves as current return for cathode and reference paths in standard shunt configuration |
| NC (Pins 2, 4, 5) | No internal connection | Unused pins; must remain unconnected per TI specification to avoid parasitic coupling or latch-up risk |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage reference | 1.24 V threshold enables regulation in 1.8V–3.3V systems where traditional 2.5V references fail |
| 0.5% VREF tolerance | Reduces feedback resistor tolerance burden and improves absolute output voltage accuracy in programmable supplies |
| Sub-100 µA IK(min) | Permits operation in ultra-low-power modes (e.g., battery-backed supervisors) without compromising regulation stability |
| Internal compensation | Eliminates need for external compensation capacitor in most applications, simplifying layout and reducing BOM count |
| SC-70 package | Enables high-density routing in compact DC/DC modules and portable electronics with strict board area constraints |
Applications
| Secondary-Side Flyback Regulation | Zener Diode Replacement |
|---|---|
|
Use Scenario: Isolated 3.3V output in AC/DC adapter with optocoupler feedback loop. IC Role / Device Role / Timing Role: Precision shunt regulator and error amplifier comparing sensed output to 1.24V reference. Use Value: Enables stable regulation at 3.3V with <±1% output tolerance and supports <50 mW standby power via 55 µA IK(min). |
Use Scenario: On-board 2.5V bias generation for analog sensor interface in IoT node. IC Role / Device Role / Timing Role: Adjustable shunt reference replacing discrete Zener + resistor network. Use Value: Delivers 0.25Ω dynamic impedance and 6 mV VREF drift over –40°C to 85°C, improving long-term sensor accuracy vs. 5% Zener tolerances. |
| Voltage Monitoring & Supervision | Comparator with Integrated Reference |
|
Use Scenario: Undervoltage lockout (UVLO) circuit detecting 2.7V rail collapse in industrial PLC module. IC Role / Device Role / Timing Role: Precision threshold detector using REF pin as input and CATHODE as open-collector output. Use Value: Leverages 0.5% VREF accuracy and 6 mV tempco to trigger at exactly 2.70V ±15 mV across full temperature range. |
Use Scenario: Logic-level window comparator for battery cell voltage monitoring in portable medical device. IC Role / Device Role / Timing Role: Single-supply comparator with built-in 1.24V reference, eliminating external reference IC. Use Value: Reduces component count by one IC and achieves <10 µs response time with >60 dB open-loop gain and 0.1 µA Iref. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431BIDBVTE4 | Same SC-70 package and 0.5% VREF tolerance, but rated for –40°C to 85°C (I-grade) instead of –40°C to 125°C (Q-grade) | Valid for industrial environments but not automotive under-hood or extended-temperature industrial control | Select TLV431BIDBVTE4 only if operating ambient stays ≤85°C; TLV431BCDBVTE4 supports wider thermal margin |
| TLVH431ACDBVR | Higher VKA range (1.24V–18V), 1% VREF tolerance, SOT-23-3 package, 80mA IK(max) | Supports higher-output-voltage SMPS and higher-current sinking, but lacks SC-70 footprint and 0.5% accuracy | Choose TLVH431ACDBVR when >6V regulation or >15mA cathode current is required; not drop-in for TLV431BCDBVTE4 layouts |
Compared with TLV431BIDBVTE4, TLV431BCDBVTE4 provides extended temperature capability (–40°C to 125°C) essential for high-reliability applications, while TLVH431ACDBVR trades accuracy and package size for broader voltage and current range-making it suitable only where those parameters dominate design priorities.
Availability
TLV431BCDBVTE4 is available at Aetrix Electronics and suitable for industrial power supplies, isolated DC/DC converters, and precision voltage supervision requiring stable component supply and guaranteed long-term manufacturability.
Supply support for TLV431BCDBVTE4 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 and embedded processing technologies, with leadership in precision analog ICs and power management solutions.
The TLV431 family was designed specifically for low-voltage, high-accuracy shunt regulation in space-constrained and thermally demanding applications such as isolated flyback converters, battery monitors, and industrial sensor interfaces.
FAQ
What is the maximum cathode voltage rating for TLV431BCDBVTE4?
The absolute maximum cathode voltage (VKA) for TLV431BCDBVTE4 is 7 V, referenced to the anode terminal. Operation beyond this voltage risks permanent damage. For reliable long-term use, the recommended maximum is 6 V under normal operating conditions, aligning with its specified adjustable output range and thermal derating curves.
Does TLV431BCDBVTE4 require an external capacitor for stability?
No, TLV431BCDBVTE4 is internally compensated and remains stable without an external output capacitor between cathode and anode. However, if a capacitive load is added (e.g., for noise filtering), phase margin data in the datasheet (Figure 5-19 through 5-21) must be consulted to select values ≤10 nF and ensure stability across temperature and operating voltage.
How does the SC-70 (DCK) package of TLV431BCDBVTE4 compare to SOT-23-3 variants?
The SC-70 (DCK) package of TLV431BCDBVTE4 measures 2.0 mm × 1.5 mm, offering a 40% smaller footprint than SOT-23-3 (2.92 mm × 2.37 mm). It uses a 6-pin layout with three NC pins, whereas SOT-23-3 has only three functional pins. This enables higher PCB density but requires updated land patterns and stencil design for assembly.
Can TLV431BCDBVTE4 be used as a standalone voltage reference without feedback?
Yes - TLV431BCDBVTE4 can operate open-loop as a precision 1.24V reference source when configured with cathode tied to a current source and anode grounded. In this mode, the REF pin must be externally biased to 1.24V using a resistor divider, and the device functions as a high-gain comparator with integrated reference, delivering fast response for voltage monitoring tasks.
What is the minimum cathode current needed to maintain regulation in TLV431BCDBVTE4?
The minimum cathode current (IK(min)) for TLV431BCDBVTE4 is 55 µA typical at 25°C and up to 100 µA over the full –40°C to 125°C temperature range. Below this threshold, the device may exit regulation, causing output voltage to rise unpredictably. Designers must ensure bias networks deliver ≥100 µA worst-case to guarantee stable operation.
TLV431BCDBVTE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 6 V
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TLV431BCDBVTE4 FAQ
1.How can I place an order for TLV431BCDBVTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431BCDBVTE4 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 TLV431BCDBVTE4 reliable?
The price and inventory of TLV431BCDBVTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431BCDBVTE4 is usually 5 days.
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TLV431BCDBVTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431BCDBVTE4 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 TLV431BCDBVTE4?
For technical support, including TLV431BCDBVTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431BCDBVTE4 requirements.
6.How does Aetrix verify that TLV431BCDBVTE4 is sourced from the original manufacturer or authorized distributors?
All TLV431BCDBVTE4 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 TLV431BCDBVTE4 meets industry standards.
7.What is the process for return or replacement of TLV431BCDBVTE4?
All TLV431BCDBVTE4 units undergo pre-shipment inspection (PSI). If there is an issue with TLV431BCDBVTE4, 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 TLV431BCDBVTE4 part is unused and in its original packaging.
Return procedure for TLV431BCDBVTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLV431BCDBVTE4 Tags
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TL431AIDBZR
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TL431BQDBZR
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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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