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Texas Instruments TLVH432IDBZT
- Part No.:
- TLVH432IDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432IDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,888
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Product details
Overview
TLVH432IDBZT 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, replacing Zener diodes with lower leakage and sharper turn-on.
For engineers reviewing the TLVH432IDBZT datasheet, TLVH432IDBZT pinout, TLVH432IDBZT application, or TLVH432IDBZT 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 TLVH432IDBZT implements a three-terminal shunt-regulator architecture with internal 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington sink output stage. Its functional block includes reference input (REF), cathode (K) as current-sink output, and anode (A) as common return - enabling closed-loop voltage regulation via external resistor divider or open-loop comparator operation.
Unlike the TLVH431, the TLVH432IDBZT uses reversed pinout (REF–CATHODE–ANODE) in the SOT-23-3 (DBZ) package, optimizing PCB layout for compact flyback feedback networks. It requires ≥100 μA cathode current to maintain regulation and exhibits stable operation without output capacitance due to internal compensation.
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 resistors |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power monitoring and higher-current shunt regulation |
| Dynamic Impedance | 0.25 Ω typical - ensures tight voltage regulation under load transients; critical for error amplifier accuracy |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial environments; full-spec performance across range |
| Voltage Regulation Range | VO = VREF to 18 V - accommodates 3.3 V, 5 V, 12 V, and 15 V rails with same device |
| Reference Input Current | 0.1–0.5 μA - minimizes divider resistor loading; enables high-impedance feedback networks |
| Output Capacitance Stability | Stable without external capacitor - eliminates need for output bypass; simplifies layout in space-constrained designs |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, gull-wing leads, JEDEC MO-178AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: REF | Reference input | High-impedance node sensing feedback voltage; must be connected to resistor divider; draws ≤0.5 μA |
| 2: CATHODE | Current-sink output | Primary regulation node; sinks cathode current (100 μA–70 mA); connects to optocoupler LED anode in flyback designs |
| 3: ANODE | Common return | Ground reference for internal circuitry; ties to system ground or power rail return; not floating |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 (2.5 V) cannot function |
| Sharp turn-on characteristic | High open-loop gain enables fast comparator response - suitable for voltage monitoring with hysteresis-free threshold detection |
| Zener replacement capability | Leakage <0.1 μA at 18 V - reduces standby power vs. standard Zeners; improves efficiency in battery-backed circuits |
| Thermal stability | ±31 mV VREF deviation over –40°C to +125°C - maintains accuracy in under-hood or industrial ambient conditions |
| Optocoupler interface optimization | Reversed DBZ pinout (REF–K–A) aligns cathode and anode pins for direct routing to optocoupler - minimizes trace length and noise coupling |
Applications
| Isolated Flyback SMPS Feedback | Adjustable Voltage Reference for ADCs |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in 3.3 V isolated DC/DC converters using optocoupler feedback. IC Role / Device Role / Timing Role: Error amplifier and precision reference - compares sampled output against 1.24 V internal reference and drives optocoupler LED current. Use Value: Enables regulation down to 2.7 V output (1.24 V + opto VF), supporting modern low-voltage rails with ±1% accuracy over temperature. |
Use Scenario: Providing stable reference voltage for SAR or delta-sigma ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Adjustable shunt reference - configured with precision resistors to generate exact 2.048 V, 4.096 V, or other ratiometric references. Use Value: 0.25 Ω dynamic impedance ensures minimal code shift during ADC conversion bursts; low Iref avoids loading high-Z sensor interfaces. |
| Low-Power Voltage Monitor | Zener Diode Replacement |
|
Use Scenario: Undervoltage lockout (UVLO) or brownout detection on microcontroller supply rails. IC Role / Device Role / Timing Role: Comparator with integrated reference - REF pin tied to divided rail voltage; cathode pulled high to enable reset signal. Use Value: 100 μA minimum cathode current allows operation from weak bias sources; ±1% tolerance ensures precise trip points without calibration. |
Use Scenario: On-board regulation for FPGA I/O banks or analog subsystems requiring low-noise, low-leakage bias. IC Role / Device Role / Timing Role: Precision shunt regulator - replaces discrete Zener + series resistor with tighter tolerance and lower tempco. Use Value: 0.1 μA max off-state current at 18 V reduces quiescent loss by >90% vs. 1N4733A; 1.24 V reference enables lower dropout than standard Zeners. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431IDBZT | Same electrical specs but SOT-23-3 pinout: ANODE–CATHODE–REF (vs. TLVH432IDBZT's REF–CATHODE–ANODE) | Requires PCB layout revision for feedback routing; less optimal for optocoupler-coupled flyback topologies | Select TLVH431IDBZT only when reusing legacy TLVH431 layouts or when anode-first routing is preferred |
| TLV431BIDBZR | Lower 1.24 V reference but wider 2.5% tolerance at 25°C; SOT-23-3 (DBZ) package; rated –40°C to +85°C only | Not suitable for automotive or extended-temp industrial use; insufficient accuracy for precision ADC references | Choose TLV431BIDBZR only for cost-sensitive consumer applications where ±2.5% tolerance and 85°C max are acceptable |
Compared with TLVH431IDBZT, TLVH432IDBZT offers optimized pinout for flyback feedback while maintaining identical regulation performance; compared with TLV431BIDBZR, it delivers tighter tolerance and extended temperature range at modest cost premium - justifying selection for industrial and automotive designs.
Availability
TLVH432IDBZT is available at Aetrix Electronics and suitable for isolated power supplies, precision data converters, voltage monitoring circuits, and low-leakage bias generation requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH432IDBZT 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 delivering analog and embedded processing solutions, with leadership in precision analog, power management, and signal chain technologies.
The TLVH432IDBZT belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, high-accuracy feedback in isolated power conversion and reference-sensitive measurement systems.
FAQ
What is the pin configuration of TLVH432IDBZT?
The TLVH432IDBZT uses a 3-pin SOT-23-3 (DBZ) package with pin 1 = REF, pin 2 = CATHODE, pin 3 = ANODE. This reversed pinout (vs. TLVH431) places REF and ANODE on opposite ends, facilitating direct connection to optocoupler anode and cathode in flyback feedback paths without crossing traces.
Does TLVH432IDBZT require an output capacitor for stability?
No, TLVH432IDBZT is internally compensated and remains stable without an output capacitor between cathode and anode. This eliminates capacitor-related phase margin concerns in most applications. However, if an output capacitor is used, Figures 5-15 through 5-17 in the datasheet provide guidance on maximum allowable values per cathode voltage to maintain stability.
What is the minimum cathode current needed for regulation in TLVH432IDBZT?
The TLVH432IDBZT requires a minimum cathode current of 100 μA to enter and maintain regulation. Below this level, open-loop gain drops significantly, impairing reference accuracy and response time. At 25°C, IK(min) is typically 60–100 μA; the guaranteed maximum is 100 μA across –40°C to +125°C.
How does TLVH432IDBZT differ from TLVH431IDBZT?
The TLVH432IDBZT and TLVH431IDBZT share identical electrical specifications and thermal ratings but differ exclusively in SOT-23-3 pinout: TLVH432IDBZT is REF–CATHODE–ANODE, while TLVH431IDBZT is ANODE–CATHODE–REF. This makes TLVH432IDBZT preferable for new flyback designs where REF-to-optocoupler and ANODE-to-ground routing simplifies layout.
Can TLVH432IDBZT be used as a comparator?
Yes, TLVH432IDBZT operates effectively as a comparator with integrated 1.24 V reference in open-loop mode. With ≥100 μA cathode current, it delivers high gain and sharp transition - ideal for voltage monitoring, UVLO, or threshold detection. The REF pin serves as the input, and cathode output swings between high-impedance and sink states based on input voltage relative to VREF.
TLVH432IDBZT 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:
- ±1.5%
- 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
TLVH432IDBZT FAQ
1.How can I place an order for TLVH432IDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432IDBZT 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 TLVH432IDBZT reliable?
The price and inventory of TLVH432IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432IDBZT is usually 5 days.
3.What payment methods are accepted for TLVH432IDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432IDBZT transactions.
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4.How is shipping managed for TLVH432IDBZT?
TLVH432IDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432IDBZT 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 TLVH432IDBZT?
For technical support, including TLVH432IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432IDBZT requirements.
6.How does Aetrix verify that TLVH432IDBZT is sourced from the original manufacturer or authorized distributors?
All TLVH432IDBZT 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 TLVH432IDBZT meets industry standards.
7.What is the process for return or replacement of TLVH432IDBZT?
All TLVH432IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432IDBZT, 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 TLVH432IDBZT part is unused and in its original packaging.
Return procedure for TLVH432IDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432IDBZT Tags
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