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Texas Instruments TLV431BQDCKT
- Part No.:
- TLV431BQDCKT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TLV431BQDCKT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:406
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Product details
Overview
TLV431BQDCKT from Texas Instruments is a low-voltage adjustable precision shunt regulator with 0.5% initial reference voltage tolerance (1.24 V at 25°C), 11 mV max VREF deviation over –40°C to 125°C, 80 µA typical minimum cathode current, 0.25 Ω typical dynamic impedance, and SC-70 (DCK) 6-pin package. It serves as an integrated voltage reference and error amplifier in isolated flyback power supplies.
For engineers reviewing the TLV431BQDCKT datasheet, TLV431BQDCKT pinout, TLV431BQDCKT application, or TLV431BQDCKT equivalent, key selection criteria include reference accuracy across automotive temperature range (–40°C to 125°C), ultra-low cathode current for standby efficiency, SC-70 footprint constraints, and stability without output capacitance in closed-loop regulation.
Technical Context
The TLV431BQDCKT implements a bandgap-referenced transconductance amplifier driving a Darlington sink output stage. Its internal architecture enables precise 1.24 V reference generation with <11 mV total drift over –40°C to 125°C and supports closed-loop regulation from 1.24 V to 6 V using two external resistors.
In open-loop mode, it functions as a comparator with integrated reference, delivering sharp turn-on response and ~1 V output low level. In closed-loop configuration-especially with optocoupler feedback-it acts as a stable error amplifier for secondary-side regulation in 3.3 V and lower isolated SMPS topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (25°C) | 1.24 V ±0.5% - Enables accurate low-voltage setpoints without calibration |
| VREF drift (–40°C to 125°C) | ≤11 mV - Ensures stable regulation in automotive under-hood environments |
| IK(min) | 55–100 µA - Supports ultra-low-power operation in battery-backed or standby circuits |
| |zKA| (dynamic impedance) | 0.25 Ω typical - Delivers tight load regulation and fast transient response |
| VKA range | 1.24 V to 6 V - Covers 3.3 V, 5 V, and adjustable outputs with single device |
| Package | SC-70 (DCK), 2.0 mm × 1.5 mm - 40% smaller footprint than SOT-23-3 for space-constrained PCBs |
| ESD rating (HBM) | ±2000 V - Robust handling during assembly and system integration |
Pinout & Package
TLV431BQDCKT uses the SC-70 (DCK) 6-pin package: 2.0 mm × 1.5 mm body, 0.65 mm pitch, gull-wing leads. Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF, Pin 4 = NC, Pin 5 = NC, Pin 6 = ANODE substrate connection (must connect to ANODE or leave open).
| 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 |
| ANODE (Pin 2) | Common reference return | Typically grounded; establishes reference potential for VREF measurement |
| REF (Pin 3) | Reference input terminal | Compares external voltage to internal 1.24 V; requires ≥0.1 µA bias current |
| NC (Pin 4) | No internal connection | Not bonded; must remain unconnected on PCB |
| NC (Pin 5) | No internal connection | Not bonded; must remain unconnected on PCB |
| Substrate (Pin 6) | Die attachment pad | Mechanically tied to ANODE; must be connected to ANODE net or left floating |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% reference tolerance at 25°C | Reduces need for post-production trimming in precision voltage monitoring and feedback loops |
| Stable operation down to 1.24 V cathode-anode voltage | Enables direct use in 1.8 V, 2.5 V, and 3.3 V systems without level-shifting circuitry |
| Internal compensation | Eliminates mandatory output capacitor-simplifies layout and improves reliability in isolated SMPS |
| Ultra-low 80 µA typical IK(min) | Permits regulation in always-on circuits with sub-100 µA quiescent current budgets |
| SC-70 package (2.0 mm × 1.5 mm) | Supports high-density power management on compact modules such as PoE PDs and USB-C chargers |
Applications
| Isolated Flyback SMPS Regulation | Voltage Monitoring & Threshold Detection |
|---|---|
Use Scenario: Secondary-side voltage sensing in 3.3 V/5 V AC-DC adapters with optocoupler feedback. IC Role / Device Role / Timing Role: Precision shunt regulator and error amplifier providing isolated feedback signal to primary-side controller. Use Value: Achieves ±1% output regulation over line/load/temperature with no external reference IC required. |
Use Scenario: Overvoltage/undervoltage detection in automotive ECU power rails (e.g., 5 V sensor supply). IC Role / Device Role / Timing Role: Comparator with integrated 1.24 V reference detecting rail deviations beyond ±5%. Use Value: Eliminates discrete Zener + comparator solution; reduces BOM count by 2 components and saves 3.5 mm² PCB area. |
| Adjustable Linear Regulator Reference | Zener Diode Replacement |
Use Scenario: Setting output voltage of adjustable LDOs (e.g., TPS7A47) in test equipment power supplies. IC Role / Device Role / Timing Role: Programmable reference source defining regulated output via resistor divider. Use Value: Enables 1.24–6 V output adjustment with 0.5% accuracy-superior to 5% Zener diodes and more flexible than fixed references. |
Use Scenario: Low-voltage clamping in I/O protection circuits for microcontrollers operating at 1.8 V or 2.5 V. IC Role / Device Role / Timing Role: Active shunt clamp replacing passive Zener, activated only when threshold exceeded. Use Value: Reduces leakage current by >90% vs. standard Zeners below knee voltage-critical for battery life in portable devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431BIDCKR | Same electrical specs but industrial temp grade (–40°C to 85°C); 0.5% VREF tolerance retained | Lacks automotive qualification (AEC-Q100); unsuitable for under-hood deployment | Select when cost sensitivity outweighs extended temperature requirement |
| TLVH431BQDBVR | Wider VKA range (1.24 V to 18 V); higher 80 mA IK rating; SOT-23-3 package | Cannot replace TLV431BQDCKT in SC-70 layouts; requires PCB redesign | Choose for higher-voltage regulation (>6 V) or where SOT-23-3 is preferred for thermal or assembly reasons |
Compared with TLV431BIDCKR, TLV431BQDCKT adds AEC-Q100 qualification and extended –40°C to 125°C operation-critical for automotive power systems. Compared with TLVH431BQDBVR, TLV431BQDCKT offers superior space efficiency (SC-70 vs SOT-23-3) and lower minimum cathode current, but trades off maximum cathode voltage and current capability.
Availability
TLV431BQDCKT is available at Aetrix Electronics and suitable for automotive power management, isolated DC-DC converters, and precision voltage monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLV431BQDCKT 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 designing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and consumer applications.
The TLV431 family was developed specifically for low-voltage, high-accuracy shunt regulation in space- and power-constrained systems-including automotive infotainment, ADAS power supplies, and isolated industrial SMPS.
FAQ
What is the guaranteed reference voltage tolerance for TLV431BQDCKT over temperature?
The TLV431BQDCKT guarantees ≤11 mV VREF deviation over the full –40°C to 125°C range, corresponding to ±0.89% of 1.24 V. This specification is validated per TI's automotive-grade characterization and appears in Section 5.7 of the SLVS139Z datasheet. The 0.5% initial tolerance at 25°C (1.234 V to 1.246 V) remains valid, and TLV431BQDCKT is qualified to AEC-Q100 Grade 1 standards.
Can TLV431BQDCKT operate stably without an output capacitor?
Yes, TLV431BQDCKT is internally compensated and does not require an output capacitor between cathode and anode for basic stability in closed-loop regulation. This is confirmed in Section 7.3 of the datasheet. However, if a capacitive load is present (e.g., optocoupler CTR variation), Figure 5-19–5-21 provide phase-margin guidance to select appropriate capacitor values and avoid oscillation.
What is the function of Pin 6 (substrate) on TLV431BQDCKT?
Pin 6 on TLV431BQDCKT is the die substrate connection, electrically tied to the ANODE. Per Table 4-1 and Figure 4-5, it must be connected to the ANODE net or left open-never floated independently. This connection ensures mechanical stability and proper thermal path; incorrect handling may cause parameter shift or latch-up under transient conditions.
How does TLV431BQDCKT differ from TLV431BIDCKR in automotive applications?
TLV431BQDCKT is qualified to AEC-Q100 Grade 1 (–40°C to 125°C) and specified for automotive under-hood use, while TLV431BIDCKR is rated only for industrial temperature (–40°C to 85°C). Both share identical 0.5% VREF tolerance and SC-70 packaging, but TLV431BQDCKT undergoes additional stress testing-including HTOL, temperature cycling, and ESD validation-to meet automotive reliability requirements.
What is the minimum cathode current needed for regulation in TLV431BQDCKT?
The TLV431BQDCKT requires a minimum cathode current (IK(min)) of 55 µA to maintain regulation, with a typical value of 80 µA and a maximum of 100 µA over temperature. This is specified in Section 5.7 (Electrical Characteristics for TLV431B) of the datasheet. Below this threshold, the device exits regulation and behaves as an open-loop comparator with degraded gain and response time.
TLV431BQDCKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
TLV431BQDCKT FAQ
1.How can I place an order for TLV431BQDCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431BQDCKT 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 TLV431BQDCKT reliable?
The price and inventory of TLV431BQDCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431BQDCKT is usually 5 days.
3.What payment methods are accepted for TLV431BQDCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV431BQDCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV431BQDCKT?
TLV431BQDCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431BQDCKT 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 TLV431BQDCKT?
For technical support, including TLV431BQDCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431BQDCKT requirements.
6.How does Aetrix verify that TLV431BQDCKT is sourced from the original manufacturer or authorized distributors?
All TLV431BQDCKT 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 TLV431BQDCKT meets industry standards.
7.What is the process for return or replacement of TLV431BQDCKT?
All TLV431BQDCKT units undergo pre-shipment inspection (PSI). If there is an issue with TLV431BQDCKT, 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 TLV431BQDCKT part is unused and in its original packaging.
Return procedure for TLV431BQDCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLV431BQDCKT Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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