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Texas Instruments TLVH432IDBZR
- Part No.:
- TLVH432IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432IDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,174
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Product details
Overview
TLVH432IDBZR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±1% initial tolerance at 25°C, and operation down to 100 µA cathode current. It delivers 0.25 Ω typical dynamic impedance and supports output voltage adjustment from 1.24 V to 18 V using two external resistors. It serves as a Zener replacement and error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH432IDBZR datasheet, TLVH432IDBZR pinout, TLVH432IDBZR application, or TLVH432IDBZR equivalent, key selection criteria include reference voltage accuracy over temperature, minimum cathode current for regulation, dynamic impedance, open-loop comparator capability, and SOT-23-3 pin compatibility with TLVH431 variants.
Technical Context
The TLVH432IDBZR implements a three-terminal shunt topology with an internal 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington sink output stage. Its functional block includes a precision reference input (REF), current-sinking output (CATHODE), and common return (ANODE).
Unlike the TLVH431, the TLVH432IDBZR uses a distinct 3-pin SOT-23 pinout: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE - enabling direct integration into compact secondary-side regulation circuits without layout rework when replacing TLVH431DBZ in existing designs requiring this pin assignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at 25°C - sets precise threshold for feedback or comparator operation |
| Min Cathode Current | 100 µA - enables regulation in ultra-low-power applications such as battery-backed monitoring |
| Dynamic Impedance | 0.25 Ω typical - ensures stable voltage reference under varying load conditions |
| Output Voltage Range | 1.24 V to 18 V - adjustable via external resistor divider, supporting wide supply rail coverage |
| Operating Temp Range | –40°C to +125°C - qualified for automotive and industrial environments without derating |
| Ref Input Current | 0.1–0.5 µA - minimizes divider network loading and improves accuracy in high-impedance circuits |
| Thermal Stability | ±31 mV max deviation over full temperature range - ensures consistent performance across thermal cycles |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size) with gull-wing leads; RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: REF | Reference input | High-impedance node sensing external voltage divider; requires ≥0.1 µA bias current |
| Pin 2: CATHODE | Current-sink output | Drains shunt current to maintain regulated voltage; connects to optocoupler LED anode in isolated SMPS |
| Pin 3: ANODE | Common return | Typically tied to system ground or power rail return; forms reference potential for REF and CATHODE |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulating at 1.24 V cathode-to-anode - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 fails |
| Ultra-low IREF | 0.1 µA typical - reduces power loss in high-resistance feedback networks and extends battery life |
| Stable without output capacitor | Internally compensated - eliminates need for external stability capacitor in most shunt regulator configurations |
| Sharp turn-on characteristic | High open-loop gain (>60 dB) - provides fast response in overvoltage detection and comparator applications |
| Multiple grade options | B/A/standard grades available - allows cost-performance trade-off: 0.5%/1%/1.5% initial tolerance at 25°C |
Applications
| Secondary-Side Regulation in Flyback SMPS | Zener Diode Replacement |
|---|---|
Use Scenario: Used with optocoupler on secondary side of isolated 3.3 V flyback converter to regulate output voltage. IC Role / Device Role / Timing Role: Acts as adjustable shunt regulator and error amplifier, comparing sampled output to internal 1.24 V reference. Use Value: Enables regulation down to ~2.7 V output (1.24 V + opto LED VF) - critical for low-voltage isolated supplies. | Use Scenario: Replaces discrete 2.5 V Zener diodes in voltage-clamp and reference circuits. IC Role / Device Role / Timing Role: Provides low-leakage (<0.1 µA off-state), temperature-stable reference with sharp knee. Use Value: Reduces reference drift by >5× vs standard Zeners and eliminates high-temperature leakage issues. |
| Voltage Monitoring for Power Rails | Comparator with Integrated Reference |
Use Scenario: Monitors 5 V or 12 V system rails for undervoltage lockout or brownout detection. IC Role / Device Role / Timing Role: Functions as precision threshold detector with built-in 1.24 V reference and high-gain output stage. Use Value: Eliminates need for external reference IC and comparator - reduces BOM count and PCB area. | Use Scenario: Detects crossing of analog signal above/below programmable threshold in sensor interface circuits. IC Role / Device Role / Timing Role: Operates open-loop as comparator with integrated reference; sinks current when REF > 1.24 V. Use Value: Delivers fast, clean logic-level output without external components - simplifies level-shifting design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431IDBZR | Different pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - not pin-compatible | Requires PCB layout change; same electrical specs and thermal performance | Select TLVH431IDBZR only if redesigning for legacy TLVH431 footprint or leveraging existing TLVH431 layout |
| TLVH432ACDBZR | 0.5% initial reference tolerance (vs 1% for TLVH432IDBZR); otherwise identical pinout and specs | Used where tighter reference accuracy is required, e.g., precision data converter references | Choose TLVHH432ACDBZR when ±0.5% VREF tolerance is mandatory and cost premium is acceptable |
Compared with TLVH431IDBZR, TLVH432IDBZR avoids PCB rework in new designs requiring its specific REF–CATHODE–ANODE pin order; compared with TLVH432ACDBZR, it trades 0.5% reference accuracy for lower unit cost while retaining identical thermal, dynamic, and operating range specifications.
Availability
TLVH432IDBZR is available at Aetrix Electronics and suitable for isolated SMPS feedback, voltage monitoring, precision comparator, and low-power shunt regulation applications requiring stable component supply and long-term lifecycle support.
Supply support for TLVH432IDBZR 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, embedded processing, and power management solutions, with leadership in precision analog ICs and industrial-grade components.
The TLVH432IDBZR belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, high-accuracy secondary-side regulation and reference applications in power conversion, sensing, and monitoring systems.
FAQ
What is the reference voltage tolerance of TLVH432IDBZR at 25°C?
The TLVH432IDBZR has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal reference with a range of 1.228 V to 1.252 V. This tolerance is specified for the 'I' grade variant and applies under recommended operating conditions with 10 mA cathode current. The TLVH432IDBZR maintains this accuracy across its full –40°C to +125°C operating temperature range with a maximum deviation of ±31 mV.
Can TLVH432IDBZR replace TL431 in existing designs?
TLVH432IDBZR cannot directly replace TL431 due to fundamental differences: TL431 has a 2.5 V reference and requires ≥1 mA minimum cathode current, while TLVH432IDBZR has a 1.24 V reference and operates down to 100 µA. Circuit redesign - including resistor divider scaling and current source adjustment - is required. However, TLVH432IDBZR is ideal for new low-voltage designs where TL431 is unsuitable.
What is the correct pin configuration for TLVH432IDBZR in SOT-23-3?
The TLVH432IDBZR uses Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE in its SOT-23-3 package. This differs from TLVH431DBZ (Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE). Confirming this pinout is essential before PCB layout - misrouting causes immediate functional failure. The device marking 'DBZ' and datasheet Figure 4-5 confirm this assignment for TLVH432IDBZR.
Does TLVH432IDBZR require an output capacitor for stability?
No, TLVH432IDBZR is internally compensated and stable without an output capacitor between CATHODE and ANODE in standard shunt regulator configurations. External capacitors may be added for noise filtering or phase margin tuning in high-capacitive-load scenarios, but Figures 5-15 to 5-17 in the datasheet show stability margins remain acceptable up to 10 nF without compensation. Adding unnecessary capacitance can degrade transient response.
How does TLVH432IDBZR function as a comparator?
When operated open-loop - with REF biased externally and no feedback to CATHODE - TLVH432IDBZR acts as a high-gain comparator. If the voltage at REF exceeds 1.24 V, the CATHODE sinks current; if below, it remains high-impedance. This behavior enables threshold detection without external op-amps. The TLVH432IDBZR delivers fast edge response and low input bias current (0.1 µA), making it suitable for precision analog monitoring circuits.
TLVH432IDBZR 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:
- ±1.5%
- 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
TLVH432IDBZR FAQ
1.How can I place an order for TLVH432IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432IDBZR 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 TLVH432IDBZR reliable?
The price and inventory of TLVH432IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432IDBZR is usually 5 days.
3.What payment methods are accepted for TLVH432IDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432IDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH432IDBZR?
TLVH432IDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432IDBZR 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 TLVH432IDBZR?
For technical support, including TLVH432IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432IDBZR requirements.
6.How does Aetrix verify that TLVH432IDBZR is sourced from the original manufacturer or authorized distributors?
All TLVH432IDBZR 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 TLVH432IDBZR meets industry standards.
7.What is the process for return or replacement of TLVH432IDBZR?
All TLVH432IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432IDBZR, 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 TLVH432IDBZR part is unused and in its original packaging.
Return procedure for TLVH432IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432IDBZR Tags
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