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Texas Instruments TLV431ACDBZRG4
- Part No.:
- TLV431ACDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLV431ACDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,414
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Product details
Overview
TLV431ACDBZRG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±1% initial tolerance at 25°C, 0.25 Ω typical dynamic impedance, 80 µA typical minimum cathode current, and operation up to 6 V cathode-anode voltage - used as an integrated reference in isolated flyback SMPS feedback loops and low-voltage Zener replacement circuits.
For engineers reviewing the TLV431ACDBZRG4 datasheet, TLV431ACDBZRG4 pinout, TLV431ACDBZRG4 application, or TLV431ACDBZRG4 equivalent, key selection considerations include reference accuracy over temperature (±4 mV from 0°C to 70°C), ultra-small SC-70 package footprint, open-loop comparator capability, and compatibility with optocoupler-based secondary-side regulation in 3.3 V systems.
Technical Context
The TLV431ACDBZRG4 implements a bandgap-referenced error amplifier with Darlington output stage, enabling precise shunt regulation via external resistor divider between cathode and reference pins. Its internal architecture supports both closed-loop regulation (as adjustable shunt reference) and open-loop operation (as comparator with built-in 1.24 V threshold).
It operates with cathode-anode voltage (VKA) from 1.24 V to 6 V and requires ≥55 µA cathode current for regulation across its full industrial temperature range (–40°C to 85°C). The device is internally compensated and stable without output capacitance, though phase margin vs. capacitive load is characterized up to 1 nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±1% at 25°C - sets minimum adjustable output; enables regulation down to 1.24 V in Zener-replacement or feedback applications. |
| Adjustable Output Range | VREF to 6 V - achieved via two external resistors; supports wide-range voltage referencing in low-voltage systems. |
| Temp Drift (0°C to 70°C) | ±4 mV - ensures stable reference in commercial-temperature environments without external trimming. |
| Dynamic Impedance | 0.25 Ω typical - provides tight regulation under load transients; critical for high-accuracy feedback paths. |
| Min Cathode Current (IK(min)) | 55 µA to 80 µA - defines lowest usable bias current for regulation; enables ultra-low-power designs. |
| Cathode-Anode Voltage (VKA) | 1.24 V to 6 V - determines headroom requirement; allows use in 1.8 V, 2.5 V, 3.3 V, and 5 V supply rails. |
| ESD Rating (HBM) | ±2000 V - meets standard handling requirements for board assembly and rework. |
Pinout & Package
TLV431ACDBZRG4 uses the SC-70 (DCK) 6-pin package (2.0 mm × 1.5 mm), with pin 1 = CATHODE, pin 3 = REF, pin 6 = ANODE, and pins 4/5 = NC. Substrate connection (pin 2) must be tied to ANODE or left floating per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Sinks regulated current; connects to feedback network or optocoupler LED anode in isolated supplies. |
| REF (Pin 3) | Reference input / threshold sense | Compares external voltage to internal 1.24 V; requires ≥0.15 µA input current; never left floating. |
| ANODE (Pin 6) | Common return / ground reference | Typically connected to system ground; serves as voltage reference point for VKA and IREF measurements. |
| NC (Pins 4, 5) | No internal connection | Unused; no electrical function; may be left unconnected or grounded for mechanical stability. |
| Substrate (Pin 2) | Die backside connection | Mandatory tie to ANODE or open - not connected to PCB ground unless ANODE is grounded. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in sub-2 V systems where TL431 (2.5 V) fails. |
| Ultra-small SC-70 package | 2.0 mm × 1.5 mm footprint - 40% smaller than SOT-23-3; saves PCB area in space-constrained power modules. |
| Integrated reference + amplifier | Single-device comparator functionality - eliminates need for external reference + op-amp in voltage-monitoring circuits. |
| Stable without output capacitor | Internally compensated - removes capacitor BOM item and layout sensitivity in basic shunt configurations. |
| Zener diode replacement | Sharp turn-on and 0.25 Ω impedance - delivers superior regulation accuracy and thermal stability vs. discrete Zeners. |
Applications
| Isolated Flyback SMPS Regulation | Low-Voltage Zener Replacement |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in 3.3 V isolated DC/DC converters using optocoupler feedback. IC Role / Device Role / Timing Role: Adjustable shunt reference and error amplifier - compares output voltage against 1.24 V reference and drives optocoupler LED current. Use Value: Enables regulation as low as 2.7 V output while maintaining ±1% accuracy across –40°C to 85°C. |
Use Scenario: On-board voltage clamping and precision biasing in battery-powered IoT sensors operating from 1.8 V rails. IC Role / Device Role / Timing Role: Precision shunt regulator - replaces 1.2 V Zener diodes with tighter tolerance and lower tempco. Use Value: Reduces reference drift from >20 mV to ±4 mV over 0°C–70°C, improving ADC reference stability. |
| Voltage Monitoring Circuit | Comparator with Integrated Reference |
|
Use Scenario: Overvoltage lockout in USB-C PD sink controllers monitoring 5 V bus integrity. IC Role / Device Role / Timing Role: Threshold detector - triggers shutdown when input exceeds 5.1 V set by resistor divider on REF pin. Use Value: Eliminates external voltage reference IC; achieves trip-point accuracy of ±1% without calibration. |
Use Scenario: Logic-level translation and signal conditioning in microcontroller GPIO monitoring of analog sensor outputs. IC Role / Device Role / Timing Role: Open-loop comparator - compares sensor voltage to internal 1.24 V reference and outputs digital flag. Use Value: Provides rail-to-rail output swing with <1 µs response time and no external components beyond pull-up resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt-regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431BIDBZR | 0.5% initial VREF tolerance (vs. 1%); same SC-70 package and pinout. | Better accuracy required in metrology-grade references or high-precision ADC biasing. | Select when ±0.5% reference stability at 25°C is mandatory; otherwise TLV431ACDBZRG4 offers optimal cost/accuracy balance. |
| TLVH431ACDBZR | Wider VKA range (1.24 V to 18 V); SOT-23-3 package; higher IK rating (80 mA vs. 15 mA). | Required for >6 V regulation or higher-current shunt applications (e.g., 12 V LDO error amplifiers). | Choose TLVH431ACDBZR only if cathode voltage exceeds 6 V or cathode current exceeds 15 mA; TLV431ACDBZRG4 is preferred for ≤6 V, low-power use. |
Compared with TLV431BIDBZR, TLV431ACDBZRG4 trades 0.5% accuracy for lower unit cost and broader availability; compared with TLVH431ACDBZR, it offers smaller size and lower quiescent current but limits maximum cathode voltage to 6 V - making it ideal for compact, low-voltage, cost-sensitive power management.
Availability
TLV431ACDBZRG4 is available at Aetrix Electronics and suitable for isolated flyback SMPS regulation, low-voltage Zener replacement, and precision voltage monitoring requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for TLV431ACDBZRG4 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.
The TLV431x family was designed specifically for low-voltage, high-accuracy shunt regulation in space-constrained power systems - targeting secondary-side feedback in isolated DC/DC converters and precision voltage referencing in battery-powered devices.
FAQ
What is the reference voltage tolerance of TLV431ACDBZRG4 at 25°C?
The TLV431ACDBZRG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a VREF range of 1.228 V to 1.252 V. This is specified in Section 5.6 of the TI datasheet SLVS139Z and applies to the 'A' grade variant. The tolerance remains stable across the full industrial temperature range (–40°C to 85°C) with a maximum deviation of ±6 mV.
Can TLV431ACDBZRG4 operate with a cathode-anode voltage below 1.24 V?
No, TLV431ACDBZRG4 cannot regulate below its internal reference voltage of 1.24 V. The device requires VKA ≥ VREF (1.24 V) to enter active regulation mode. At VKA < 1.24 V, it remains in cutoff with off-state cathode current ≤0.1 µA. This behavior is confirmed in Figure 5-4 and Section 5.3 Recommended Operating Conditions.
What is the minimum cathode current needed for regulation in TLV431ACDBZRG4?
The TLV431ACDBZRG4 requires a minimum cathode current (IK(min)) of 55 µA to 80 µA for stable regulation across its rated temperature range (–40°C to 85°C), as specified in Section 5.6 Electrical Characteristics. Below this threshold, gain drops significantly, leading to poor regulation and slow transient response - particularly critical in low-power battery applications.
Is TLV431ACDBZRG4 pin-compatible with TL431 or TLVH431?
No, TLV431ACDBZRG4 is not pin-compatible with TL431 (SOT-23-3 or TO-92) or TLVH431ACDBZR (SOT-23-3). It uses the SC-70 (DCK) 6-pin package with unique pinout: Pin 1 = CATHODE, Pin 3 = REF, Pin 6 = ANODE. Substrate pin (Pin 2) adds a layout constraint absent in 3-pin variants. Direct replacement requires PCB redesign.
Does TLV431ACDBZRG4 require an output capacitor for stability?
No, TLV431ACDBZRG4 is internally compensated and stable without an output capacitor between cathode and anode - a key advantage over many linear regulators. However, if an output capacitor is added for noise filtering, Figure 5-19 in the datasheet shows phase margin vs. capacitive load, confirming stability up to 1 nF at VKA = 1.25 V. Larger values risk oscillation.
TLV431ACDBZRG4 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:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLV431ACDBZRG4 FAQ
1.How can I place an order for TLV431ACDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431ACDBZRG4 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 TLV431ACDBZRG4 reliable?
The price and inventory of TLV431ACDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431ACDBZRG4 is usually 5 days.
3.What payment methods are accepted for TLV431ACDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV431ACDBZRG4 transactions.
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4.How is shipping managed for TLV431ACDBZRG4?
TLV431ACDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431ACDBZRG4 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 TLV431ACDBZRG4?
For technical support, including TLV431ACDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431ACDBZRG4 requirements.
6.How does Aetrix verify that TLV431ACDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TLV431ACDBZRG4 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 TLV431ACDBZRG4 meets industry standards.
7.What is the process for return or replacement of TLV431ACDBZRG4?
All TLV431ACDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLV431ACDBZRG4, 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 TLV431ACDBZRG4 part is unused and in its original packaging.
Return procedure for TLV431ACDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLV431ACDBZRG4 Tags
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