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Texas Instruments TL432BQDBVTE4
- Part No.:
- TL432BQDBVTE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432BQDBVTE4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,239
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Product details
Overview
TL432BQDBVTE4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-5 package, featuring 0.5% initial reference voltage tolerance at 25°C, 14 mV max reference voltage deviation over −40°C to 125°C, and 0.2 Ω typical dynamic impedance. It operates as an adjustable 2.483–36 V shunt regulator with 1–100 mA cathode sink capability, widely used in secondary-side regulation of automotive-grade flyback SMPSs.
For engineers reviewing the TL432BQDBVTE4 datasheet, TL432BQDBVTE4 pinout, TL432BQDBVTE4 application, or TL432BQDBVTE4 equivalent, key selection criteria include its Q-grade temperature range (−40°C to 125°C), B-grade accuracy, SOT-23-5 pinout distinct from TL431, low reference input current (2–4 µA), and suitability for safety-critical voltage monitoring and Zener replacement in high-reliability power systems.
Technical Context
The TL432BQDBVTE4 implements a three-terminal adjustable shunt regulator architecture with internal error amplifier, reference, and output transistor. Its REF pin senses voltage relative to ANODE, enabling precise feedback control in isolated topologies where ANODE serves as the local ground reference.
Unlike TL431, the TL432 variant uses a different pinout in DBV (SOT-23-5) packaging: Pin 1 = NC, Pin 2 = ANODE, Pin 3 = NC, Pin 4 = REF, Pin 5 = CATHODE. This configuration supports compact layout in space-constrained automotive and industrial power supplies requiring stable 2.5 V reference derivation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (Vref) | 2483–2507 mV at 25°C - enables ±0.5% output regulation without external trimming |
| Temp Range | −40°C to +125°C - qualified for under-hood automotive and industrial ambient conditions |
| VI(dev) | 14–34 mV max deviation - ensures ≤0.14% reference drift across full Q-grade temperature range |
| Cathode Current (IKA) | 1–100 mA sink capability - supports direct drive of optocoupler LEDs in isolated feedback loops |
| Dynamic Impedance | 0.2 Ω typical - maintains tight regulation under fast load transients in switching regulators |
| Reference Input Current | 2–4 µA - minimizes resistor-divider loading error and improves accuracy in high-impedance setpoints |
| Min Cathode Current (Imin) | 0.4–0.7 mA - allows stable regulation even at light loads typical in standby power stages |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | No Connection (NC) | Internally unconnected - must be left floating or tied to ANODE per layout guidelines |
| Pin 2 | ANODE | Common reference node - connected to system ground or return path in shunt configuration |
| Pin 3 | No Connection (NC) | Internally unconnected - no PCB trace required; avoid routing signals nearby |
| Pin 4 | REF | High-impedance input - compares external divider voltage to internal 2.495 V reference |
| Pin 5 | CATHODE | Active sink output - delivers regulated current to external load or optocoupler LED |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Initial Accuracy (B Grade) | Reduces need for post-manufacturing calibration in automotive voltage monitors and battery management references |
| Q-Grade Temperature Rating | Enables use in engine control units, ADAS power supplies, and other AEC-Q100-aligned systems |
| 0.2 Ω Dynamic Impedance | Suppresses output ripple and improves transient response in 500 kHz+ flyback converters |
| Low 2–4 µA Reference Current | Lowers power loss in high-resistance feedback dividers, extending battery life in always-on circuits |
| Pin-to-Pin Alternative to TL431 (DBV) | Allows migration to TL432's optimized pinout for improved noise immunity and layout flexibility |
Applications
| Automotive Flyback SMPS Regulation | Zener Diode Replacement |
|---|---|
|
Use Scenario: Secondary-side voltage feedback in isolated 12 V → 5 V/3.3 V DC-DC converters for infotainment and body control modules. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.495 V threshold to drive optocoupler LED, closing isolation barrier feedback loop. Use Value: Enables ±1% output regulation across temperature and line/load variations, meeting OEM power supply specs. |
Use Scenario: Precision voltage clamping and reference generation in analog sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Adjustable shunt regulator replacing discrete Zener diodes where tighter tolerance and lower tempco are required. Use Value: Delivers 0.5% accuracy and 14 mV max drift vs. >5% tolerance and >50 mV drift of standard Zeners. |
| Voltage Monitoring & Supervision | Comparator with Integrated Reference |
|
Use Scenario: Undervoltage lockout (UVLO) and overvoltage protection (OVP) in 24 V industrial PLC power rails. IC Role / Device Role / Timing Role: Programmable threshold detector using external resistor divider on REF pin, sinking current when threshold exceeded. Use Value: Eliminates need for external precision reference and comparator IC, reducing BOM count and board area. |
Use Scenario: Level-shifting and window detection in mixed-signal interfaces between MCU I/O and analog subsystems. IC Role / Device Role / Timing Role: Reference source for external comparator or integrated comparator function via cathode switching behavior. Use Value: Provides stable 2.495 V reference with <0.2 Ω output impedance, minimizing hysteresis errors in threshold detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBVR | Same B-grade accuracy and Q-temp range, but TL431 DBV pinout (Pin 1=CATHODE, Pin 2=REF, Pin 3=ANODE) | Requires PCB redesign due to reversed CATHODE/REF/ANODE assignment; not drop-in compatible | Select only if legacy TL431 layout reuse is prioritized over optimal noise immunity |
| TL432LIQDBVR | Improved VI(dev) ≤6 mV (vs. 14 mV), lower Iref (1.5 µA typ), same Q-grade and DBV pinout | Better stability in high-precision sensing; higher cost and longer lead time | Choose when reference drift <6 mV is mandatory, e.g., in battery cell voltage monitoring |
Compared with TL431BQDBVR, TL432BQDBVTE4 offers superior layout compatibility for new designs due to dedicated REF and CATHODE pins, while TL432LIQDBVR trades cost for enhanced thermal stability-making TL432BQDBVTE4 the balanced choice for automotive SMPS feedback where 14 mV drift is acceptable.
Availability
TL432BQDBVTE4 is available at Aetrix Electronics and suitable for automotive power conversion, industrial voltage supervision, and precision analog reference applications requiring stable component supply across extended temperature ranges.
Supply support for TL432BQDBVTE4 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 leader delivering analog, embedded processing, and connectivity solutions with focus on reliability, efficiency, and system-level innovation.
The TL43x family was designed specifically for precision voltage referencing in isolated power supplies, voltage monitoring, and Zener replacement-emphasizing thermal stability, low output impedance, and wide operating temperature support.
FAQ
What is the reference voltage tolerance of TL432BQDBVTE4 at 25°C?
The TL432BQDBVTE4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2483–2507 mV range. This B-grade accuracy is specified in Section 7.13 of the SLVS543P datasheet and applies under recommended operating conditions with 10 mA cathode current. The TL432BQDBVTE4 achieves this tolerance without external trimming, making it suitable for high-accuracy feedback loops in automotive and industrial systems.
How does the TL432BQDBVTE4 pinout differ from TL431 in SOT-23-5 packages?
The TL432BQDBVTE4 uses a distinct SOT-23-5 (DBV) pinout: Pin 1 = NC, Pin 2 = ANODE, Pin 3 = NC, Pin 4 = REF, Pin 5 = CATHODE. In contrast, TL431 DBV places CATHODE on Pin 1, REF on Pin 2, and ANODE on Pin 3. This difference prevents direct PCB substitution. The TL432BQDBVTE4 layout separates REF and CATHODE to reduce noise coupling, improving stability in sensitive feedback paths.
What is the maximum cathode voltage rating for TL432BQDBVTE4?
The absolute maximum cathode-to-anode voltage (VKA) for TL432BQDBVTE4 is 37 V, as stated in Section 7.1 of the SLVS543P datasheet. The recommended operating range is Vref to 36 V. Exceeding 37 V risks permanent damage. This rating enables use in 24 V and 36 V industrial and commercial power rails, provided proper derating and thermal management are applied per RθJA = 206°C/W for DBV package.
Can TL432BQDBVTE4 replace a Zener diode in a 5 V regulation circuit?
Yes, TL432BQDBVTE4 can directly replace a Zener diode in 5 V regulation by configuring R1 and R2 to set VOUT = Vref × (1 + R1/R2). With Vref = 2.495 V, a 10 kΩ R2 and 10.1 kΩ R1 yields ~5.00 V. Its 0.2 Ω dynamic impedance, 0.5% tolerance, and 14 mV tempco outperform typical 5% Zeners, especially under varying temperature and current-making TL432BQDBVTE4 ideal for precision 5 V references.
What is the minimum cathode current required for regulation in TL432BQDBVTE4?
The minimum cathode current (Imin) for stable regulation in TL432BQDBVTE4 is 0.4–0.7 mA, depending on temperature and grade, per Section 7.13 of SLVS543P. At −40°C, Imin = 0.7 mA; at 25°C, it is 0.4 mA. Maintaining ≥0.7 mA ensures reliable turn-on across the full −40°C to 125°C range. This value informs optocoupler LED current selection in flyback feedback designs using TL432BQDBVTE4.
TL432BQDBVTE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL432BQDBVTE4 FAQ
1.How can I place an order for TL432BQDBVTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432BQDBVTE4 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 TL432BQDBVTE4 reliable?
The price and inventory of TL432BQDBVTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432BQDBVTE4 is usually 5 days.
3.What payment methods are accepted for TL432BQDBVTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432BQDBVTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432BQDBVTE4?
TL432BQDBVTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432BQDBVTE4 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 TL432BQDBVTE4?
For technical support, including TL432BQDBVTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432BQDBVTE4 requirements.
6.How does Aetrix verify that TL432BQDBVTE4 is sourced from the original manufacturer or authorized distributors?
All TL432BQDBVTE4 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 TL432BQDBVTE4 meets industry standards.
7.What is the process for return or replacement of TL432BQDBVTE4?
All TL432BQDBVTE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432BQDBVTE4, 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 TL432BQDBVTE4 part is unused and in its original packaging.
Return procedure for TL432BQDBVTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432BQDBVTE4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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