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Texas Instruments TLV431BQDBVRQ1
- Part No.:
- TLV431BQDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLV431BQDBVRQ1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,802
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Product details
Overview
TLV431BQDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified, low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±0.5% initial tolerance at 25°C, 0.25 Ω typical dynamic impedance, and operation from –40°C to 125°C ambient. It functions as a programmable Zener replacement or error amplifier in isolated flyback feedback loops for 3.3 V SMPS systems.
For engineers reviewing the TLV431BQDBVRQ1 datasheet, TLV431BQDBVRQ1 pinout, TLV431BQDBVRQ1 application, or TLV431BQDBVRQ1 equivalent, key selection criteria include cathode current range (0.1–15 mA), reference terminal current (≤0.5 µA), temperature drift (11 mV over –40°C to 125°C), and SOT-23-3 package compatibility with space-constrained automotive power rails.
Technical Context
The TLV431BQDBVRQ1 implements a 3-terminal shunt-regulator architecture with an internal bandgap reference and high-gain transconductance amplifier driving a Darlington output stage. It operates in two functional modes: open-loop comparator (with integrated 1.24 V reference) and closed-loop shunt regulator (using external resistive divider feedback between cathode and reference pins).
Its design enables stable regulation down to 1.24 V with only 80 µA typical cathode current, making it suitable for low-headroom applications where legacy TL431 devices cannot operate. The device is internally compensated and does not require an output capacitor for stability, though capacitive load limits are defined per Figure 5-18.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.24 V ±0.5% at 25°C - sets minimum regulation voltage and defines accuracy baseline for all adjusted outputs |
| VO Range | 1.24 V to 6 V - adjustable via two external resistors; enables direct support of 3.3 V and 5 V rail monitoring without level-shifting |
| IK(min) | 55–100 µA - minimum cathode current required to maintain regulation; enables ultra-low-power biasing in always-on automotive circuits |
| |zKA| | 0.25 Ω typical - low dynamic impedance ensures tight voltage regulation under load transients in feedback paths |
| TA Range | –40°C to 125°C - AEC-Q100 Grade 1 qualification confirms suitability for under-hood and ADAS power supply monitoring |
| Iref | ≤0.5 µA - ultra-low reference pin current minimizes resistor-divider loading error and improves accuracy in high-impedance feedback networks |
| VKA(max) | 7 V - absolute maximum cathode-to-anode voltage; defines safe operating margin for 6 V regulated outputs |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body size, surface-mount, lead-free, RoHS-compliant. Anode pin serves as common ground reference; cathode handles shunt current; reference pin senses feedback voltage.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference input | High-impedance sensing node; must be connected to voltage divider midpoint to set output; draws ≤0.5 µA |
| 2 (CATHODE) | Shunt current output | Sinks regulated current to anode; connects to optocoupler LED or feedback network; supports 0.1–15 mA |
| 3 (ANODE) | Common return | Typically tied to system ground; forms cathode-to-anode voltage (VKA) that determines regulation point |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to 125°C ambient operation in automotive powertrain and body electronics |
| Low-voltage reference (1.24 V) | Enables regulation below 2.5 V, supporting modern 1.8 V/3.3 V logic rails and low-VIN DC-DC converters |
| 0.5% VREF tolerance at 25°C | Reduces calibration overhead in battery monitoring and sensor reference circuits; tighter than TLV431A-Q1 (1%) |
| 80 µA typical cathode current | Lowers standby power in always-on vehicle modules such as CAN wake-up supervisors and door module keep-alive circuits |
| 0.25 Ω dynamic impedance | Minimizes output voltage deviation during load steps in secondary-side SMPS feedback loops |
Applications
| Automotive Battery Monitoring | Isolated Flyback Secondary Regulation |
|---|---|
Use Scenario: Real-time 12 V battery voltage tracking in engine control units with cold-cranking detection. IC Role / Device Role / Timing Role: Adjustable shunt reference comparing divided battery voltage against internal 1.24 V threshold. Use Value: Enables accurate undervoltage lockout at 9.5 V using 1% resistors, with <11 mV drift over full temperature range. |
Use Scenario: Voltage feedback path in 3.3 V isolated flyback converter for infotainment domain controller. IC Role / Device Role / Timing Role: Error amplifier + reference in optocoupler-coupled feedback loop regulating secondary output. Use Value: Achieves ±1% output regulation across line/load/temperature with no external compensation components required. |
| Zener Diode Replacement | Comparator with Integrated Reference |
Use Scenario: Low-power voltage clamp on LIN bus transceiver supply rail in body control module. IC Role / Device Role / Timing Role: Precision shunt regulator replacing 1.2 V Zener diode with superior thermal stability. Use Value: Reduces voltage drift from >50 mV to 11 mV over –40°C to 125°C, improving bus fault detection margin. |
Use Scenario: Overvoltage detection on 5 V camera sensor power rail in ADAS vision ECU. IC Role / Device Role / Timing Role: Open-loop comparator comparing sensed rail to internal 1.24 V reference. Use Value: Provides fast response (<1 µs) with built-in reference, eliminating need for external precision voltage source. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431AQDBVRQ1 | 1% VREF tolerance at 25°C vs. 0.5% for TLV431BQDBVRQ1; otherwise identical electrical specs and pinout | Acceptable where ±1% output regulation is sufficient, e.g., non-safety-critical lighting or HVAC controls | Select TLV431AQDBVRQ1 when cost sensitivity outweighs need for highest reference accuracy. |
| TLVH431AQDBVRQ1 | Wider VKA range (1.24 V to 18 V); higher IK capability (up to 80 mA); different pinout (SOT-23-3 vs. SOT-23-5) | Required for >6 V regulation or higher-current shunt applications; not pin-compatible | Choose TLVH431AQDBVRQ1 only when extended voltage range or current drive exceeds TLV431BQDBVRQ1 limits. |
Compared with TLV431AQDBVRQ1, TLV431BQDBVRQ1 delivers tighter reference accuracy for critical voltage supervision, while TLVH431AQDBVRQ1 trades pin compatibility for wider operational range-neither offers drop-in replacement capability without layout or resistor network changes.
Availability
TLV431BQDBVRQ1 is available at Aetrix Electronics and suitable for automotive battery monitoring, isolated flyback regulation, Zener replacement, and comparator-based voltage supervision requiring stable component supply across extended temperature ranges.
Supply support for TLV431BQDBVRQ1 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 automotive-grade power management and precision analog ICs.
The TLV431x-Q1 product line was designed specifically for AEC-Q100-compliant automotive subsystems requiring high-accuracy, low-voltage shunt regulation in harsh thermal environments.
FAQ
What is the reference voltage tolerance of TLV431BQDBVRQ1 at 25°C?
The TLV431BQDBVRQ1 has a reference voltage tolerance of ±0.5% at 25°C, meaning its VREF falls within 1.234 V to 1.246 V under nominal conditions. This tighter tolerance distinguishes it from the TLV431AQDBVRQ1 (±1%), and is confirmed in Section 5.6 of the SLVS905B datasheet. The TLV431BQDBVRQ1 maintains this specification across its full –40°C to 125°C operating range with a maximum deviation of 31 mV.
Can TLV431BQDBVRQ1 replace a standard Zener diode in automotive circuits?
Yes, TLV431BQDBVRQ1 is explicitly designed as a precision Zener diode replacement, offering superior thermal stability (11 mV drift over –40°C to 125°C vs. >50 mV for typical Zeners), lower dynamic impedance (0.25 Ω vs. >10 Ω), and guaranteed AEC-Q100 Grade 1 qualification. Its 1.24 V reference enables direct substitution in low-voltage clamping applications where conventional Zeners lack accuracy or temperature performance.
What is the minimum cathode current required for regulation in TLV431BQDBVRQ1?
The TLV431BQDBVRQ1 requires a minimum cathode current (IK(min)) of 55 µA to 100 µA across its full temperature range to maintain regulation. This value is specified in Section 5.6 of the datasheet and reflects worst-case conditions at –40°C and 125°C. Operating below this threshold risks loss of regulation and degraded gain, especially in open-loop comparator mode.
Does TLV431BQDBVRQ1 require an output capacitor for stability?
No, TLV431BQDBVRQ1 is internally compensated and does not require an output capacitor between cathode and anode for basic stability. However, when driving capacitive loads (e.g., optocoupler LEDs with parasitic capacitance), stability boundaries are defined in Figure 5-18 of the datasheet. For designs exceeding those limits, a small series resistor or carefully selected capacitor may be needed-but the device itself remains stable without external capacitance under recommended operating conditions.
What package type is used by TLV431BQDBVRQ1?
TLV431BQDBVRQ1 uses the SOT-23-3 (DBZ) package: a 3-pin, surface-mount plastic package measuring 2.90 mm × 1.30 mm. Pin 1 is REF, Pin 2 is CATHODE, and Pin 3 is ANODE. This package is distinct from the SOT-23-5 variant used by other TLV431x-Q1 versions and is fully documented in the Mechanical, Packaging, and Orderable Information section (Section 11) of the SLVS905B datasheet.
TLV431BQDBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TLV431BQDBVRQ1 FAQ
1.How can I place an order for TLV431BQDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431BQDBVRQ1 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 TLV431BQDBVRQ1 reliable?
The price and inventory of TLV431BQDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431BQDBVRQ1 is usually 5 days.
3.What payment methods are accepted for TLV431BQDBVRQ1?
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4.How is shipping managed for TLV431BQDBVRQ1?
TLV431BQDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431BQDBVRQ1 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 TLV431BQDBVRQ1?
For technical support, including TLV431BQDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431BQDBVRQ1 requirements.
6.How does Aetrix verify that TLV431BQDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TLV431BQDBVRQ1 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 TLV431BQDBVRQ1 meets industry standards.
7.What is the process for return or replacement of TLV431BQDBVRQ1?
All TLV431BQDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TLV431BQDBVRQ1, 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 TLV431BQDBVRQ1 part is unused and in its original packaging.
Return procedure for TLV431BQDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLV431BQDBVRQ1 Tags
-
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
Microchip Technology
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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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