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Texas Instruments TLVH432ACDBZT
- Part No.:
- TLVH432ACDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432ACDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
TLVH432ACDBZT from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, providing 1.24 V reference voltage with ±1% initial tolerance at 25°C, 0.25 Ω typical dynamic impedance, and operation from 1.24 V to 18 V output range. It serves as an error amplifier or voltage reference in isolated flyback SMPS feedback loops and replaces low-voltage Zener diodes in on-board regulation.
For engineers reviewing the TLVH432ACDBZT datasheet, TLVH432ACDBZT pinout, TLVH432ACDBZT application, or TLVH432ACDBZT equivalent, key selection criteria include cathode current range (100 μA–70 mA), thermal stability (–40°C to +125°C), reference voltage deviation over temperature (±31 mV for Q-grade), and compatibility with optocoupler-based secondary-side regulation in 3.3 V systems.
Technical Context
The TLVH432ACDBZT implements a 3-terminal shunt topology with internal 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington sink output stage. Its open-loop mode enables comparator functionality with integrated reference, while closed-loop operation-via resistive feedback between cathode and reference pins-enables precise voltage regulation.
Unlike the TLVH431, the TLVH432ACDBZT uses reversed pinout (REF–CATHODE–ANODE) in the SOT-23-3 (DBZ) package, enabling direct replacement in layouts where anode-to-ground routing simplifies PCB layout. It requires ≥100 μA cathode current to maintain regulation and exhibits sharp turn-on characteristics due to active output circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±1% at 25°C - sets minimum regulated output; enables 1.24–18 V adjustment with two external resistors |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power monitoring and higher-current shunt regulation without external gain stages |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under load transients; critical for stable feedback in SMPS |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial environments; full-spec performance across extended range |
| Voltage Regulation Range | 1.24 V to 18 V - accommodates 3.3 V, 5 V, and 12 V rails; compatible with optocoupler LED forward drop in isolated supplies |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error; enables high-impedance feedback networks for low power |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, surface-mount, gull-wing leads, JEDEC MO-178AA compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference input | High-impedance node sensing external voltage divider; must be connected to feedback network; draws ≤0.5 μA |
| 2 - CATHODE | Shunt current output | Sink terminal carrying regulated cathode current; connects to optocoupler anode or load return path |
| 3 - ANODE | Common reference/ground | Low-impedance return path; typically tied to system ground or power rail common; substrate-connected in DBZ |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in 1.8 V and 3.3 V systems where traditional 2.5 V references fail |
| Ultra-low reference current | 0.1–0.5 μA - reduces divider power loss and improves accuracy with high-value feedback resistors (e.g., 1 MΩ) |
| Stable without output capacitor | Internally compensated - eliminates need for cathode-to-anode bypass cap in most applications, reducing BOM count |
| Sharp turn-on characteristic | Active Darlington output - provides fast response in comparator mode and clean regulation edge in shunt mode |
| Grade-selectable tolerance | A-grade (±1%) - balances cost and precision for industrial power supplies requiring tighter than standard-grade (±1.5%) |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
|
Use Scenario: Provides stable, low-drift reference for SAR and delta-sigma ADCs in battery-powered sensors and portable instrumentation. IC Role / Device Role / Timing Role: Precision shunt reference supplying VREF input to ADC; replaces discrete Zener + op-amp combos. Use Value: 0.25 Ω dynamic impedance and ±31 mV VREF deviation over –40°C to +125°C ensure <0.01% LSB drift in 16-bit converters. |
Use Scenario: Error amplifier in isolated 3.3 V flyback converter, feeding optocoupler LED to regulate output via primary-side controller. IC Role / Device Role / Timing Role: Closed-loop shunt regulator comparing sampled output to internal 1.24 V reference; drives optocoupler current. Use Value: Enables regulation down to 2.7 V output (1.24 V + 1.4 V LED drop); 100 μA IK(min) allows startup at light loads. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
|
Use Scenario: Replaces 2.4 V or 3.3 V Zener diodes in LDO feedback paths and bias networks for analog front-ends. IC Role / Device Role / Timing Role: Adjustable shunt element setting precise bias points; configured with fixed R1/R2 for target voltage. Use Value: 1.24 V base reference + 0.1 μA IREF eliminates Zener leakage errors and improves temperature coefficient by >5× vs. 5% Zeners. |
Use Scenario: Monitors 5 V or 12 V supply rails in PLC I/O modules and motor drive controllers for brownout detection. IC Role / Device Role / Timing Role: Open-loop comparator with integrated reference; triggers reset or fault signal when rail drops below threshold. Use Value: Eliminates external reference IC; ±1% VREF tolerance ensures accurate 4.8–5.2 V window detection at 25°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBZT | Same electrical specs but SOT-23-3 pinout: CATHODE–REF–ANODE (vs. REF–CATHODE–ANODE) | Requires PCB layout revision; not drop-in in TLVH432 footprint | Select when legacy TLVH431 layout reuse is prioritized over pinout optimization |
| TLVH432BIDBZT | 0.5% initial VREF tolerance (vs. 1%), same package and temp range (–40°C to +125°C) | Higher precision for metrology-grade supplies; marginally higher cost | Select when ±0.5% reference accuracy is required for <12-bit system-level precision |
Compared with TLVH431ACDBZT, TLVH432ACDBZT offers optimized pinout for ground-referenced feedback; compared with TLVH432BIDBZT, it trades 0.5% tolerance for lower unit cost while retaining identical thermal and dynamic performance.
Availability
TLVH432ACDBZT is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and isolated DC-DC converters requiring stable component supply with guaranteed long-term availability.
Supply support for TLVH432ACDBZT 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.
The TLVH432ACDBZT belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, high-accuracy feedback in isolated and non-isolated power conversion systems.
FAQ
What is the exact pin configuration of TLVH432ACDBZT in the SOT-23-3 package?
The TLVH432ACDBZT uses REF–CATHODE–ANODE pinout (pin 1 = REF, pin 2 = CATHODE, pin 3 = ANODE) in the SOT-23-3 (DBZ) package. This differs from TLVH431 variants and is optimized for ground-referenced feedback topologies. Pin 3 (ANODE) is internally connected to the substrate and must be tied to system ground or the common return path.
Can TLVH432ACDBZT regulate output voltages below 3.3 V?
Yes - TLVH432ACDBZT regulates from 1.24 V up to 18 V. In isolated flyback designs using an optocoupler, the minimum achievable output is ~2.7 V (1.24 V reference + ~1.4 V LED forward voltage). Its 100 μA minimum cathode current enables stable regulation even at very light loads typical in low-power standby modes.
How does TLVH432ACDBZT differ from TLVH431ACDBZT electrically?
TLVH432ACDBZT and TLVH431ACDBZT share identical electrical specifications - same 1.24 V reference, ±1% tolerance, 0.25 Ω dynamic impedance, and –40°C to +125°C operation. The sole difference is pin assignment in the SOT-23-3 package: TLVH432ACDBZT uses REF–CATHODE–ANODE, while TLVH431ACDBZT uses CATHODE–REF–ANODE. No electrical parameter differs between them.
Is an output capacitor required for stability with TLVH432ACDBZT?
No - TLVH432ACDBZT is internally compensated and stable without a cathode-to-anode capacitor. However, if a capacitive load is present (e.g., optocoupler CTR variation or long traces), Figures 5-15–5-17 in the datasheet provide phase-margin guidance for selecting ≤1 nF ceramic capacitors to maintain stability under worst-case conditions.
What is the maximum cathode voltage rating for TLVH432ACDBZT?
The absolute maximum cathode voltage (VKA) for TLVH432ACDBZT is 20 V, defined as voltage at the cathode relative to the anode. Recommended operating range is VREF (1.24 V) to 18 V. Exceeding 20 V risks permanent damage, and operation above 18 V violates recommended conditions even if within absolute max ratings.
TLVH432ACDBZT 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:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLVH432ACDBZT FAQ
1.How can I place an order for TLVH432ACDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432ACDBZT 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 TLVH432ACDBZT reliable?
The price and inventory of TLVH432ACDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432ACDBZT is usually 5 days.
3.What payment methods are accepted for TLVH432ACDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432ACDBZT transactions.
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4.How is shipping managed for TLVH432ACDBZT?
TLVH432ACDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432ACDBZT 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 TLVH432ACDBZT?
For technical support, including TLVH432ACDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432ACDBZT requirements.
6.How does Aetrix verify that TLVH432ACDBZT is sourced from the original manufacturer or authorized distributors?
All TLVH432ACDBZT 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 TLVH432ACDBZT meets industry standards.
7.What is the process for return or replacement of TLVH432ACDBZT?
All TLVH432ACDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432ACDBZT, 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 TLVH432ACDBZT part is unused and in its original packaging.
Return procedure for TLVH432ACDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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