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Texas Instruments TLVH432BIDBZT
- Part No.:
- TLVH432BIDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432BIDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,289
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Product details
Overview
TLVH432BIDBZT from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, featuring 1.24 V reference voltage with ±0.5% initial tolerance at 25°C, 100 μA to 70 mA cathode current range, and operation from –40°C to +125°C. It functions as an integrated voltage reference and error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH432BIDBZT datasheet, TLVH432BIDBZT pinout, TLVH432BIDBZT application, or TLVH432BIDBZT equivalent, key selection criteria include reference accuracy over temperature, dynamic impedance (0.25 Ω), cathode current headroom for regulation, and compatibility with optocoupler-based secondary-side control in 3.3 V systems.
Technical Context
The TLVH432BIDBZT implements a bandgap-referenced error amplifier with Darlington output stage, enabling precise shunt regulation down to 1.24 V. Its internal architecture supports both open-loop comparator operation and closed-loop feedback regulation without external compensation.
Unlike the TLVH431, the TLVH432BIDBZT uses reversed pinout (REF–CATHODE–ANODE) in the SOT-23-3 package, optimizing layout for compact flyback feedback networks where REF connects directly to optocoupler cathode and CATHODE interfaces with transformer bias winding.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - sets minimum regulated output in feedback networks |
| Cathode Current Range | 100 μA to 70 mA - defines minimum bias for stable regulation and max power dissipation capability |
| Dynamic Impedance | 0.25 Ω typical - determines output voltage stability under load transients |
| Operating Temperature | –40°C to +125°C - enables use in automotive under-hood and industrial power supply environments |
| Output Voltage Range | VREF to 18 V - achieved via two external resistors, supporting wide-range adjustable references |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error in high-impedance feedback networks |
| Line Regulation | –1.5 to –2.7 mV/V - quantifies reference voltage drift with cathode voltage variation |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference input | High-impedance node sensing feedback voltage; must be connected externally to set regulation point |
| 2 - CATHODE | Current sink output | Primary current path for shunt regulation; connects to optocoupler LED anode or bias winding |
| 3 - ANODE | Common return | Typically grounded or tied to system common; serves as reference for cathode voltage measurement |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates from 1.24 V - enables compatibility with 1.8 V, 2.5 V, and 3.3 V rails where legacy TL431 fails |
| Ultra-low reference current | 0.1–0.5 μA - reduces divider power loss and improves accuracy in high-R feedback networks |
| Stable without output capacitor | Internally compensated - eliminates need for stability-tuning capacitor in most flyback designs |
| High temperature grade | Q-grade (–40°C to +125°C) - qualified for automotive and industrial power supply applications |
| Reversed SOT-23 pinout | REF–CATHODE–ANODE - simplifies PCB routing in optocoupler-coupled feedback paths |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary Side Regulation in Flyback SMPSs |
|---|---|
Use Scenario: Providing precise, low-drift reference voltage for 12-bit to 16-bit SAR and delta-sigma ADCs in battery-powered instrumentation. IC Role / Device Role / Timing Role: Shunt regulator establishing stable VREF node; replaces discrete Zener + op-amp combos. Use Value: 0.5% initial tolerance and <±31 mV total deviation over –40°C to +125°C ensure converter accuracy remains within spec across environmental stress. | Use Scenario: Closed-loop voltage sensing on secondary side of isolated 3.3 V flyback converter using PC817 optocoupler. IC Role / Device Role / Timing Role: Error amplifier + reference in feedback path; compares output voltage against 1.24 V and drives optocoupler LED current. Use Value: Reversed pinout (REF–CATHODE–ANODE) places REF adjacent to optocoupler cathode, minimizing parasitic trace inductance and improving transient response. |
| Zener Replacement with Low Leakage Current | Voltage Monitoring for Power Rails |
Use Scenario: Replacing 1.2 V Zener diodes in low-power microcontroller reset circuits where leakage must stay below 100 nA. IC Role / Device Role / Timing Role: Precision shunt clamp; sinks current only when rail exceeds VREF × (1 + R1/R2). Use Value: Off-state cathode current ≤0.1 μA at 18 V ensures negligible standby power draw in always-on monitoring nodes. | Use Scenario: Monitoring 5 V and 12 V rails in industrial PLC I/O modules for brownout detection and fault logging. IC Role / Device Role / Timing Role: Comparator with integrated reference; triggers logic-level alert when rail drops below threshold. Use Value: Sharp turn-on characteristic and 0.25 Ω output impedance enable fast, clean transitions without hysteresis circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH432BIDCKR | SC-70-6 package; 2.00 mm × 1.25 mm footprint; 6-pin layout with NC and substrate pins | Better thermal performance (RθJA = 259°C/W vs 206°C/W) but requires different PCB layout and decoupling strategy | Choose for space-constrained designs needing ultra-small footprint; verify substrate pin connection per datasheet Figure 4-2. |
| TLVH431BIDBZT | Same SOT-23-3 package but standard TLVH431 pinout (CATHODE–ANODE–REF); identical electrical specs | Requires inverted feedback resistor placement; less optimal for optocoupler-coupled layouts due to longer REF trace | Choose when reusing existing TLVH431 layout; confirm REF node routing avoids noise coupling in high-dV/dt environments. |
Compared with TLVH432BIDBZT, TLVH432BIDCKR offers 40% smaller area but higher thermal resistance, while TLVH431BIDBZT shares identical performance but demands layout revision to accommodate pinout reversal-making TLVH432BIDBZT optimal for new flyback designs prioritizing routing simplicity and thermal margin.
Availability
TLVH432BIDBZT is available at Aetrix Electronics and suitable for isolated power supplies, precision analog monitoring, and low-voltage reference generation requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH432BIDBZT 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 TLVH432BIDBZT belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, high-accuracy feedback in isolated DC/DC converters and reference-sensitive data acquisition systems.
FAQ
What is the reference voltage tolerance of TLVH432BIDBZT at 25°C?
The TLVH432BIDBZT has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal value with min/max bounds of 1.234 V and 1.246 V. This B-grade accuracy is confirmed in Section 5.7 of the TI SLVS555N datasheet and applies across all operating conditions unless otherwise specified. The TLVH432BIDBZT maintains this tolerance without external calibration.
How does the TLVH432BIDBZT pinout differ from TLVH431 variants?
The TLVH432BIDBZT uses a reversed SOT-23-3 pinout: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. In contrast, TLVH431BIDBZT assigns Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF. This reversal optimizes PCB routing for optocoupler-based feedback, placing REF adjacent to the optocoupler cathode terminal. The TLVH432BIDBZT pinout is explicitly defined in Figure 4-5 of the datasheet.
What is the minimum cathode current required for regulation in TLVH432BIDBZT?
The TLVH432BIDBZT requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.5 (IK(min)) of the datasheet. Below this threshold, gain drops significantly and reference accuracy degrades. This value holds across the full –40°C to +125°C temperature range and is independent of output voltage setting.
Can TLVH432BIDBZT operate without an output capacitor?
Yes, the TLVH432BIDBZT is internally compensated and operates stably without an output capacitor between CATHODE and ANODE. This is confirmed in Section 7.3 of the datasheet, which states "TLVH431 is internally compensated to be stable without an output capacitor." Since TLVH432BIDBZT shares identical internal architecture and compensation, the same applies. Capacitors may be added only for specific EMI or phase-margin tuning per Figures 5-15 to 5-17.
What is the dynamic impedance of TLVH432BIDBZT and how does it affect regulation?
The TLVH432BIDBZT has a typical dynamic impedance of 0.25 Ω, measured at f ≤ 1 kHz with cathode current from 0.1 mA to 70 mA. This low value directly determines output voltage variation under load steps: ΔVOUT ≈ 0.25 Ω × ΔIK. For example, a 10 mA load transient induces only 2.5 mV shift-critical for maintaining tight regulation in precision power supplies.
TLVH432BIDBZT 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:
- Obsolete
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLVH432BIDBZT FAQ
1.How can I place an order for TLVH432BIDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432BIDBZT 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 TLVH432BIDBZT reliable?
The price and inventory of TLVH432BIDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432BIDBZT is usually 5 days.
3.What payment methods are accepted for TLVH432BIDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432BIDBZT transactions.
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4.How is shipping managed for TLVH432BIDBZT?
TLVH432BIDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432BIDBZT 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 TLVH432BIDBZT?
For technical support, including TLVH432BIDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432BIDBZT requirements.
6.How does Aetrix verify that TLVH432BIDBZT is sourced from the original manufacturer or authorized distributors?
All TLVH432BIDBZT 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 TLVH432BIDBZT meets industry standards.
7.What is the process for return or replacement of TLVH432BIDBZT?
All TLVH432BIDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432BIDBZT, 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 TLVH432BIDBZT part is unused and in its original packaging.
Return procedure for TLVH432BIDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432BIDBZT Tags
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