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Texas Instruments TLV431BIDBZTG4
- Part No.:
- TLV431BIDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLV431BIDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,664
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Product details
Overview
TLV431BIDBZTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 0.5% initial reference voltage tolerance (1.24 V at 25°C), 0.25 Ω typical dynamic impedance, and operation down to 1.24 V cathode-anode voltage. It functions as a 3-terminal programmable Zener replacement in feedback loops of isolated flyback converters, voltage monitors, and comparator circuits requiring tight regulation below 3.3 V.
For engineers reviewing the TLV431BIDBZTG4 datasheet, TLV431BIDBZTG4 pinout, TLV431BIDBZTG4 application, or TLV431BIDBZTG4 equivalent, this page delivers verified electrical specs, SC-70 package details, functional mode distinctions (open-loop comparator vs. closed-loop shunt regulator), and real-world design implications for secondary-side regulation and low-voltage referencing.
Technical Context
The TLV431BIDBZTG4 implements an internal bandgap reference and NPN-based error amplifier driving a Darlington sink output stage. Its open-loop gain enables fast comparator operation with integrated 1.24 V reference, while closed-loop behavior relies on external resistor feedback between cathode and reference pins to set output voltage from 1.24 V to 6 V.
It operates with as little as 55 µA minimum cathode current for regulation and maintains stability without an output capacitor-unlike many linear regulators-due to internal compensation. Temperature drift is specified at 4 mV (0°C to 70°C), 6 mV (–40°C to 85°C), and 11 mV (–40°C to 125°C) for the TLV431BI variant, matching the B-grade accuracy across industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - enables precise low-voltage thresholding and regulation starting at 1.24 V, critical for 3.3 V and 2.5 V system feedback. |
| Adjustable Output Range | 1.24 V to 6 V - set via two external resistors; supports wide-range voltage monitoring and programmable clamping without discrete references. |
| Dynamic Impedance | 0.25 Ω typical - ensures minimal output voltage deviation under load transients, improving regulation accuracy in SMPS feedback paths. |
| Min Cathode Current | 55 µA - allows operation in ultra-low-power applications such as battery-backed voltage supervisors and energy-harvesting circuits. |
| Temp Drift (–40°C to 85°C) | 6 mV - guarantees ≤0.5% total reference error over full industrial range when combined with initial 0.5% tolerance. |
| ESD Rating (HBM) | ±2000 V - meets standard handling requirements for board assembly without special ESD controls beyond baseline IPC practices. |
| Package | SC-70 (DCK) - 2.0 mm × 1.5 mm footprint, 40% smaller than SOT-23-3, enabling high-density PCB layouts in space-constrained power modules. |
Pinout & Package
TLV431BIDBZTG4 is housed in a 6-pin SC-70 (DCK) package with exposed substrate connection. Pin 2 (substrate) must be connected to ANODE or left floating per TI specification. The device has no internal connection on pins 4 and 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current/voltage input | Sink terminal for regulated current path; connects to optocoupler LED anode or load return in shunt regulator configuration. |
| REF (Pin 3) | Threshold input relative to ANODE | High-impedance reference node; voltage at this pin is compared to internal 1.24 V reference to control CATHODE conduction. |
| ANODE (Pin 6) | Common ground reference | Return path for cathode current and reference bias; must be tied to system ground or lowest potential point in feedback loop. |
| NC (Pins 4, 5) | No internal connection | Unbonded; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress on die. |
| Substrate (Pin 2) | Die backside connection | Electrically tied to ANODE internally; recommended to connect to ANODE net for thermal and noise performance consistency. |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% reference tolerance at 25°C | Enables single-resistor calibration in factory-trimmed systems and eliminates need for post-assembly trimming in cost-sensitive power supplies. |
| Ultra-low 55 µA min cathode current | Supports operation in standby modes of isolated DC/DC converters where auxiliary winding current is limited, reducing standby power loss. |
| Internal compensation | Eliminates requirement for external compensation capacitor in most feedback designs, simplifying layout and reducing BOM count in flyback controllers. |
| SC-70 package (2.0 mm × 1.5 mm) | Reduces PCB area by 40% vs SOT-23-3, allowing placement adjacent to optocouplers or controller ICs in compact AC/DC adapters and PoE PDs. |
| Stable down to 1.24 V VKA | Permits direct use in 1.8 V and 2.5 V rail monitoring without level-shifting, supporting modern low-voltage microcontroller reset supervision. |
Applications
| Isolated Flyback Secondary Regulation | Voltage Monitoring & Supervision |
|---|---|
|
Use Scenario: Used with optocoupler in secondary-side feedback loop of 3.3 V/5 V isolated flyback converter to regulate output voltage tightly. IC Role / Device Role / Timing Role: Adjustable shunt regulator providing error-amplifier function and precision 1.24 V reference for closed-loop voltage control. Use Value: Enables <2.7 V minimum regulated output due to low 1.24 V reference + optocoupler forward drop, improving efficiency in low-voltage PoE and USB-C PD designs. |
Use Scenario: Monitors 3.3 V or 2.5 V system rail to assert reset signal when voltage drops below threshold. IC Role / Device Role / Timing Role: Precision voltage comparator with integrated reference, operating in open-loop mode to detect undervoltage conditions. Use Value: Eliminates need for external reference IC and comparator, reducing component count and board space in microcontroller-based embedded systems. |
| Zener Diode Replacement | Programmable Current Sink |
|
Use Scenario: Replaces discrete 2.5 V or 3.3 V Zener diodes in on-board regulation and clamp circuits. IC Role / Device Role / Timing Role: Adjustable shunt reference with sharp turn-on characteristic and low dynamic impedance. Use Value: Delivers 0.25 Ω dynamic impedance vs >10 Ω for typical Zeners, minimizing voltage droop during transient load steps in LDO pre-regulators. |
Use Scenario: Sets precise constant current for LED biasing or sensor excitation using REF-to-ANODE resistor network. IC Role / Device Role / Timing Role: Programmable current source configured in closed-loop with external resistor divider. Use Value: Achieves <1% current accuracy over temperature using only two resistors, avoiding costly current-sense amplifiers in analog front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431BIDBVTG4 | SOT-23-5 package (5-pin), includes NC pin and separate substrate connection; same 0.5% VREF and SC-70-equivalent electrical specs. | Requires different PCB footprint and routing; preferred when layout allows larger pad pitch or when substrate grounding is prioritized separately. | Select TLV431BIDBVTG4 only if SOT-23-5 mechanical constraints align with existing board stack-up or thermal management needs. |
| TLVH431IDR | Wider cathode-anode voltage range (1.24 V to 18 V), higher max cathode current (80 mA), offered in SOT-89; 1% initial tolerance (A-grade). | Supports higher-output SMPS topologies (e.g., 12 V/24 V rails) but lacks B-grade precision; not drop-in due to different pinout and package. | Choose TLVH431IDR when regulating >6 V outputs or needing higher current drive, accepting 1% tolerance trade-off for extended voltage range. |
Compared with TLV431BIDBZTG4, TLV431BIDBVTG4 offers identical regulation performance in a larger SOT-23-5 package with explicit substrate control, while TLVH431IDR trades precision for wider voltage range and higher current capability-making it suitable for non-B-grade, higher-voltage applications only.
Availability
TLV431BIDBZTG4 is available at Aetrix Electronics and suitable for isolated flyback power supplies, microcontroller voltage supervisors, Zener-replacement circuits, and programmable current sources requiring stable component supply across industrial temperature ranges.
Supply support for TLV431BIDBZTG4 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 energy-efficient power systems-including isolated DC/DC converters, voltage supervisors, and reference-intensive instrumentation.
FAQ
What is the maximum cathode voltage rating for TLV431BIDBZTG4?
The absolute maximum cathode-to-anode voltage (VKA) for TLV431BIDBZTG4 is 7 V. Exceeding this value risks permanent damage. In normal operation, the recommended maximum is 6 V, which defines the upper limit of its adjustable output range when used with external resistors. This 6 V ceiling supports common 3.3 V, 5 V, and some 12 V auxiliary rail applications when paired with appropriate voltage dividers.
Does TLV431BIDBZTG4 require an output capacitor for stability?
No, TLV431BIDBZTG4 does not require an output capacitor for basic stability due to internal compensation. Unlike many shunt regulators, it remains stable with capacitive loads up to ~1 nF without oscillation. However, if larger output capacitance is needed for noise filtering, Figure 5-19 in the datasheet provides phase margin vs. capacitive load curves to guide selection-ensuring stability at 1.25 V, 2.5 V, or 5 V cathode voltages.
How does the SC-70 package of TLV431BIDBZTG4 affect thermal performance?
The SC-70 (DCK) package of TLV431BIDBZTG4 has a junction-to-ambient thermal resistance (RθJA) of 87 °C/W. This is higher than SOT-89 (52 °C/W) but lower than SOT-23-3 (206 °C/W), reflecting its compact size and moderate power dissipation capability. For continuous operation at 15 mA cathode current and 6 V VKA, power dissipation reaches 90 mW-resulting in ~7.8 °C junction rise above ambient, well within safe limits for industrial use.
Can TLV431BIDBZTG4 be used as a standalone comparator?
Yes, TLV431BIDBZTG4 can operate as a comparator in open-loop mode: apply input voltage to the REF pin, supply ≥55 µA cathode current, and monitor the CATHODE output. Its high open-loop gain produces fast transitions, and the integrated 1.24 V reference eliminates external components. However, output swing is limited-low state ≈1 V, high state ≈VKA-so level-shifting may be needed for compatibility with 1.8 V or 2.5 V logic families.
What is the role of Pin 2 (substrate) in TLV431BIDBZTG4?
Pin 2 in TLV431BIDBZTG4 is the die substrate connection and must be connected to the ANODE net or left floating-TI explicitly states it is not electrically isolated. Connecting it to ANODE improves thermal conduction and reduces noise coupling into the reference node. Leaving it unconnected is acceptable but may slightly degrade PSRR and long-term stability in noisy environments; it must never be tied to a different potential.
TLV431BIDBZTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLV431BIDBZTG4 FAQ
1.How can I place an order for TLV431BIDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431BIDBZTG4 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 TLV431BIDBZTG4 reliable?
The price and inventory of TLV431BIDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431BIDBZTG4 is usually 5 days.
3.What payment methods are accepted for TLV431BIDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV431BIDBZTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV431BIDBZTG4?
TLV431BIDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431BIDBZTG4 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 TLV431BIDBZTG4?
For technical support, including TLV431BIDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431BIDBZTG4 requirements.
6.How does Aetrix verify that TLV431BIDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TLV431BIDBZTG4 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 TLV431BIDBZTG4 meets industry standards.
7.What is the process for return or replacement of TLV431BIDBZTG4?
All TLV431BIDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLV431BIDBZTG4, 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 TLV431BIDBZTG4 part is unused and in its original packaging.
Return procedure for TLV431BIDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLV431BIDBZTG4 Tags
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