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Texas Instruments TLVH432BQDBZT
- Part No.:
- TLVH432BQDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432BQDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,644
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Product details
Overview
TLVH432BQDBZT from Texas Instruments is a B-grade (0.5% initial tolerance), 3-pin SOT-23 packaged, low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, 100 μA minimum cathode current, and –40°C to +125°C operating range. It functions as a programmable voltage reference or error amplifier in isolated flyback SMPS feedback loops, replacing Zener diodes with lower leakage and sharper turn-on.
For engineers reviewing the TLVH432BQDBZT datasheet, TLVH432BQDBZT pinout, TLVH432BQDBZT application, or TLVH432BQDBZT equivalent, key selection criteria include reference accuracy at temperature extremes, dynamic impedance under load variation, cathode current headroom for optocoupler drive, and SOT-23-3 pin compatibility with legacy TL431-based layouts.
Technical Context
The TLVH432BQDBZT implements a bandgap-referenced error amplifier with Darlington output stage, enabling precise shunt regulation from 1.24 V to 18 V using two external resistors. Its open-loop operation supports comparator functionality with integrated 1.24 V threshold, while closed-loop configuration delivers stable voltage reference with 0.25 Ω typical dynamic impedance.
Unlike the TLVH431, the TLVH432BQDBZT uses REF–CATHODE–ANODE pinout (Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE) in SOT-23-3, optimizing layout for secondary-side feedback circuits where cathode connects directly to optocoupler anode. Thermal stability is specified across –40°C to +125°C with ≤31 mV VREF deviation over full range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±0.5% at 25°C; sets minimum regulated output and defines feedback divider ratio. |
| Reference Voltage Deviation | ≤31 mV over –40°C to +125°C; ensures stable regulation across automotive/industrial temperature ranges. |
| Minimum Cathode Current (IK(min)) | 100 μA; lowest current sustaining regulation-critical for low-power optocoupler biasing in standby mode. |
| Dynamic Impedance (|zKA|) | 0.25 Ω typical; determines output voltage ripple rejection and loop stability when used with capacitive loads. |
| Cathode Voltage Range (VKA) | 1.24 V to 18 V; enables wide-range adjustable output without external op-amps or level-shifting circuitry. |
| Reference Input Current (Iref) | 0.1–0.5 μA; ultra-low input bias minimizes divider resistor power loss and improves high-impedance sensing accuracy. |
| ESD Rating (HBM) | ±2000 V; meets industrial handling requirements without additional protection circuitry. |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size) with gull-wing leads; moisture sensitivity level (MSL) 1 per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: REF | Reference input | High-impedance node comparing external voltage to internal 1.24 V bandgap; requires ≥0.1 μA bias current. |
| Pin 2: CATHODE | Shunt current output | Sink terminal delivering regulation current to ground or optocoupler LED; voltage here is regulated output. |
| Pin 3: ANODE | Common return | Ground reference for internal amplifier and reference; must be connected to system ground or low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V-enables direct use in 1.8 V, 2.5 V, and 3.3 V systems without level-shifting. |
| B-grade precision | 0.5% initial VREF tolerance at 25°C-reduces calibration overhead in high-accuracy power supply designs. |
| Ultra-low Iref | 0.1–0.5 μA reference input current-permits use of MΩ-range feedback dividers, minimizing quiescent power. |
| Wide cathode current range | 100 μA to 70 mA operation-supports both microamp-level monitoring and milliamp-level optocoupler drive. |
| Stable without output capacitor | Internally compensated-eliminates need for external cathode-to-anode capacitor in most feedback configurations. |
Applications
| Isolated Flyback SMPS Feedback | Zener Diode Replacement |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in 3.3 V isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Adjustable shunt regulator and error amplifier-compares sampled output against 1.24 V reference and sinks current into optocoupler LED. Use Value: Enables regulation as low as 2.7 V output (1.24 V + 1.4 V LED drop); replaces discrete Zener + op-amp with single IC, reducing BOM count and layout area. |
Use Scenario: Low-leakage, temperature-stable voltage clamp on 1.8 V–5 V power rails. IC Role / Device Role / Timing Role: Precision shunt reference-maintains fixed voltage by sinking excess current when rail exceeds programmed threshold. Use Value: 0.02–0.1 μA off-state cathode current reduces standby power vs. standard Zeners; 0.25 Ω dynamic impedance improves transient response. |
| Voltage Monitoring Circuit | Comparator with Integrated Reference |
|
Use Scenario: Undervoltage lockout (UVLO) or overvoltage detection on microcontroller supply rails. IC Role / Device Role / Timing Role: Threshold detector-REF pin biased to monitored rail; cathode pulled high until threshold crossed, then sinks current to signal fault. Use Value: Eliminates need for external reference IC and comparator; 0.5% VREF tolerance ensures accurate trip points across temperature. |
Use Scenario: Level-shifting comparator for analog sensor outputs feeding digital logic inputs. IC Role / Device Role / Timing Role: Open-loop comparator-uses internal 1.24 V reference to compare input against fixed threshold without external components. Use Value: Reduces component count vs. op-amp + reference solution; sharp turn-on characteristic ensures clean logic transitions with minimal hysteresis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BQDBZT | Same electrical specs and grade, but REF–ANODE–CATHODE pinout (Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE). | Requires PCB layout revision to route feedback from cathode instead of anode; not drop-in compatible. | Select TLVH431BQDBZT only if existing design uses TLVH431 pinout or allows trace rework. |
| TLVH432AQDBZT | A-grade (1% VREF tolerance at 25°C); otherwise identical electrical performance and pinout. | Suitable where ±1% regulation accuracy suffices-e.g., non-critical bias supplies or cost-sensitive consumer designs. | Choose TLVH432AQDBZT to reduce unit cost when tighter than 1% tolerance is unnecessary. |
Compared with TLVH432BQDBZT, TLVH431BQDBZT demands layout changes due to reversed anode/cathode pins, while TLVH432AQDBZT trades 0.5% precision for lower cost-making TLVH432BQDBZT optimal for automotive and industrial feedback where accuracy and pinout alignment are critical.
Availability
TLVH432BQDBZT is available at Aetrix Electronics and suitable for isolated power supplies, voltage monitoring systems, and precision reference circuits requiring stable component supply across extended temperature ranges.
Supply support for TLVH432BQDBZT 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 TLVH432BQDBZT belongs to TI's precision shunt regulator product line, designed specifically for high-accuracy, low-voltage feedback in isolated DC/DC converters and voltage supervision circuits.
FAQ
What is the exact pinout configuration of TLVH432BQDBZT in the SOT-23-3 package?
The TLVH432BQDBZT uses REF–CATHODE–ANODE pinout: Pin 1 is REF (reference input), Pin 2 is CATHODE (shunt current output), and Pin 3 is ANODE (common ground return). This differs from TLVH431 variants and must be verified against PCB footprint before layout integration. TLVH432BQDBZT's pin assignment is explicitly defined in Figure 4-5 of the SLVS555N datasheet.
How does the 0.5% reference voltage tolerance of TLVH432BQDBZT impact output regulation accuracy in a flyback converter?
The 0.5% VREF tolerance at 25°C directly limits the best-case output voltage accuracy achievable with ideal resistors-e.g., a 5.0 V output set by a 1.24 V reference has ±25 mV baseline error. TLVH432BQDBZT's ≤31 mV VREF deviation over –40°C to +125°C adds further drift, making it suitable for applications requiring <1% total output tolerance with proper resistor selection and thermal design.
Can TLVH432BQDBZT operate stably without an output capacitor between cathode and anode?
Yes, TLVH432BQDBZT is internally compensated and operates stably without an output capacitor in most configurations. However, capacitive loads >1 nF may reduce phase margin; Figures 5-15 through 5-17 in the datasheet provide guidance for selecting stable capacitor values based on cathode voltage and load conditions. TLVH432BQDBZT's stability is confirmed across its full 100 μA–70 mA cathode current range.
What is the minimum cathode current required for TLVH432BQDBZT to maintain regulation, and why does it matter?
TLVH432BQDBZT requires ≥100 μA cathode current (IK(min)) to enter and sustain regulation. Below this, gain drops and reference tracking degrades-critical in low-power standby modes of isolated SMPS where optocoupler LED current may fall near this threshold. TLVH432BQDBZT's 100 μA spec enables reliable operation where legacy TL431 (1 mA IK(min)) would fail.
How does TLVH432BQDBZT differ functionally from TLVH431BQDBZT despite identical part numbering except for '1' vs '2'?
TLVH432BQDBZT and TLVH431BQDBZT share identical electrical specifications and grade (B), but differ exclusively in pinout: TLVH432BQDBZT uses REF–CATHODE–ANODE, while TLVH431BQDBZT uses REF–ANODE–CATHODE. This reversal affects PCB routing and feedback topology-TLVH432BQDBZT places cathode adjacent to REF for direct optocoupler connection, whereas TLVH431BQDBZT isolates cathode on the opposite side. TLVH432BQDBZT is not pin-compatible with TLVH431BQDBZT.
TLVH432BQDBZT 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:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 70 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:
- SOT-23-3
TLVH432BQDBZT FAQ
1.How can I place an order for TLVH432BQDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432BQDBZT 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 TLVH432BQDBZT reliable?
The price and inventory of TLVH432BQDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432BQDBZT is usually 5 days.
3.What payment methods are accepted for TLVH432BQDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432BQDBZT transactions.
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4.How is shipping managed for TLVH432BQDBZT?
TLVH432BQDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432BQDBZT 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 TLVH432BQDBZT?
For technical support, including TLVH432BQDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432BQDBZT requirements.
6.How does Aetrix verify that TLVH432BQDBZT is sourced from the original manufacturer or authorized distributors?
All TLVH432BQDBZT 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 TLVH432BQDBZT meets industry standards.
7.What is the process for return or replacement of TLVH432BQDBZT?
All TLVH432BQDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432BQDBZT, 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 TLVH432BQDBZT part is unused and in its original packaging.
Return procedure for TLVH432BQDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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