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Texas Instruments TLVH432BIDBZR
- Part No.:
- TLVH432BIDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH432BIDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,694
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Product details
Overview
TLVH432BIDBZR from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, featuring 0.5% initial reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, 100 μA to 70 mA cathode current range, and operation from –40°C to +125°C. It serves as an error amplifier or voltage reference in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH432BIDBZR datasheet, TLVH432BIDBZR pinout, TLVH432BIDBZR application, or TLVH432BIDBZR equivalent, key selection criteria include reference accuracy, cathode current headroom, thermal stability over industrial temperature range, and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH432BIDBZR implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal architecture forces the REF pin to 1.24 V when sufficient cathode current (≥100 μA) is supplied, enabling closed-loop regulation via external resistor dividers.
Unlike the TLVH431, the TLVH432BIDBZR uses reversed pinout (REF–CATHODE–ANODE) in the SOT-23-3 package, optimizing layout for optocoupler-coupled feedback paths in compact 3.3 V/5 V SMPS designs while maintaining identical electrical characteristics and thermal specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±0.5% at 25°C - sets precise regulation threshold for feedback networks |
| Cathode Current Range | 100 μA to 70 mA - supports low-power monitoring and high-current shunt regulation |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Dynamic Impedance | 0.25 Ω typical - ensures stable regulation under fast load transients |
| Reference Input Current | 0.1–0.5 μA - minimizes divider network power loss and voltage error |
| Output Voltage Range | VREF to 18 V - adjustable via two external resistors without auxiliary supply |
| Thermal Stability | ±11 mV max deviation over full temperature range - enables high-accuracy systems without calibration |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm), 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 to resistor divider midpoint |
| 2 - CATHODE | Shunt current output | Sinks regulated current to maintain REF at 1.24 V; connects to optocoupler LED anode in isolated supplies |
| 3 - ANODE | Common return | Typically grounded or tied to system common; provides reference for cathode voltage measurement |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V rail monitoring and regulation |
| Ultra-low reference current | 0.1–0.5 μA - reduces power loss in high-resistance feedback networks and extends battery life |
| Stable without output capacitor | Internally compensated - eliminates need for external stabilization capacitor in most applications |
| Sharp turn-on characteristic | High open-loop gain (>60 dB) - provides clean comparator action for voltage monitoring and fault detection |
| Robust ESD protection | ±2000 V HBM - withstands handling and board assembly without additional protection circuitry |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
Use Scenario: Providing precise, temperature-stable reference voltage for 12-bit to 16-bit ADCs and DACs in industrial data acquisition modules. IC Role / Device Role / Timing Role: Shunt reference establishing VREF = 1.24 V × (1 + R1/R2); replaces discrete Zener + op-amp solutions. Use Value: 0.5% initial tolerance and ±11 mV thermal drift ensure <0.1% total reference error across –40°C to +125°C, meeting high-resolution converter requirements. | Use Scenario: Closed-loop voltage sensing on secondary side of isolated 3.3 V/5 V flyback converters powering microcontrollers and sensors. IC Role / Device Role / Timing Role: Error amplifier comparing output voltage to internal 1.24 V reference and driving optocoupler LED to regulate primary-side controller. Use Value: Reversed SOT-23 pinout (REF–CATHODE–ANODE) simplifies PCB routing to optocoupler, reducing parasitic inductance and improving transient response. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
Use Scenario: Replacing 1.2 V–5.1 V Zener diodes in low-leakage biasing, clamping, and level-shifting circuits. IC Role / Device Role / Timing Role: Precision shunt regulator with 0.02–0.1 μA off-state cathode current - 100× lower leakage than standard Zeners. Use Value: Ultra-low IK(off) enables accurate low-current biasing in battery-powered IoT nodes where standby current must stay below 1 μA. | Use Scenario: Monitoring 1.8 V, 2.5 V, or 3.3 V system rails for undervoltage lockout (UVLO) or supervisor functions in embedded controllers. IC Role / Device Role / Timing Role: Comparator mode: REF pin tied to monitored rail via resistor; CATHODE pulled high to enable logic-level alert when rail drops below threshold. Use Value: Integrated 1.24 V reference eliminates external reference IC, reducing BOM count and PCB area while supporting rail-specific thresholds via resistor scaling. |
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 | Requires different PCB layout; smaller size suits ultra-dense designs but needs revised decoupling | Select when board space is constrained and SC-70 reflow capability exists |
| TLVH431BIDBZR | Same SOT-23-3 package but standard pinout (CATHODE–ANODE–REF); identical electrical specs | Direct replacement only if feedback network wiring accommodates pin order change | Choose when existing layout uses TLVH431 pinout and no routing revision is possible |
Compared with TLVH432BIDCKR, TLVH432BIDBZR offers larger pad area for improved thermal dissipation and easier manual rework; compared with TLVH431BIDBZR, its reversed pinout reduces trace length to optocouplers in flyback designs, lowering noise susceptibility and improving loop stability.
Availability
TLVH432BIDBZR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and medical sensor interfaces requiring stable component supply with guaranteed long-term availability.
Supply support for TLVH432BIDBZR 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 for industrial, automotive, and communications markets.
The TLVH432BIDBZR belongs to TI's precision shunt regulator product line, engineered specifically for low-voltage, high-accuracy feedback in isolated power conversion and voltage monitoring applications.
FAQ
What is the reference voltage tolerance of TLVH432BIDBZR at 25°C?
The TLVH432BIDBZR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal value with a range of 1.234 V to 1.246 V. This grade-B tolerance is confirmed in Section 5.7 of the official datasheet and applies specifically to the TLVH432B variant. The TLVH432BIDBZR maintains this accuracy across its full operating temperature range with ≤±11 mV total deviation.
How does the pinout of TLVH432BIDBZR differ from TLVH431BIDBZR?
The TLVH432BIDBZR uses a reversed SOT-23-3 pinout: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. In contrast, TLVH431BIDBZR is Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF. This difference is intentional to simplify optocoupler connection in flyback feedback loops. Both share identical electrical characteristics, but TLVH432BIDBZR requires updated PCB layout and schematic symbol mapping.
What is the minimum cathode current required for regulation in TLVH432BIDBZR?
The TLVH432BIDBZR requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.5–5.7 under IK(min). This value is valid across the full temperature range (–40°C to +125°C) and is critical for stable operation in low-power applications such as battery-backed supervisors or energy-harvesting systems. Below this threshold, gain drops and regulation degrades.
Can TLVH432BIDBZR operate without an output capacitor?
Yes, TLVH432BIDBZR is internally compensated and operates stably without an output capacitor between CATHODE and ANODE under typical conditions. Section 7.3 confirms this design feature. However, if capacitive loading exceeds 1 nF or phase margin is marginal due to PCB parasitics, Figure 5-15 through 5-17 in the datasheet provide guidance for selecting a stabilizing capacitor. TLVH432BIDBZR's stability is independent of load capacitance up to ~100 pF.
What is the dynamic impedance of TLVH432BIDBZR and why does it matter?
The TLVH432BIDBZR has a typical dynamic impedance of 0.25 Ω, measured at 1 kHz with cathode current from 0.1 mA to 70 mA. This low value directly determines output voltage ripple rejection and load regulation performance: for every 1 mA change in cathode current, output voltage changes by only 0.25 mV. It enables tight regulation in precision references and fast transient response in SMPS feedback loops.
TLVH432BIDBZR 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLVH432BIDBZR FAQ
1.How can I place an order for TLVH432BIDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432BIDBZR 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 TLVH432BIDBZR reliable?
The price and inventory of TLVH432BIDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432BIDBZR is usually 5 days.
3.What payment methods are accepted for TLVH432BIDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432BIDBZR transactions.
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4.How is shipping managed for TLVH432BIDBZR?
TLVH432BIDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432BIDBZR 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 TLVH432BIDBZR?
For technical support, including TLVH432BIDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432BIDBZR requirements.
6.How does Aetrix verify that TLVH432BIDBZR is sourced from the original manufacturer or authorized distributors?
All TLVH432BIDBZR 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 TLVH432BIDBZR meets industry standards.
7.What is the process for return or replacement of TLVH432BIDBZR?
All TLVH432BIDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432BIDBZR, 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 TLVH432BIDBZR part is unused and in its original packaging.
Return procedure for TLVH432BIDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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