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Texas Instruments TL432QDBVRG4
- Part No.:
- TL432QDBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432QDBVRG4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,107
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Product details
Overview
TL432QDBVRG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance (B grade), 14 mV max reference voltage deviation over −40°C to +125°C, 0.2 Ω typical dynamic impedance, and 1–100 mA sink-current capability. It serves as an adjustable voltage reference or Zener replacement in automotive-grade secondary-side regulation circuits.
For engineers reviewing the TL432QDBVRG4 datasheet, TL432QDBVRG4 pinout, TL432QDBVRG4 application, or TL432QDBVRG4 equivalent, this page delivers verified electrical specs, validated pin functions, temperature-stable performance data for Q-grade operation, and real-world implementation context for flyback SMPS feedback loops and voltage monitoring systems.
Technical Context
The TL432QDBVRG4 implements a three-terminal adjustable shunt regulator architecture with internal error amplifier, reference, and output transistor. Its REF–ANODE–CATHODE pinout differs from TL431, enabling distinct PCB layout compatibility while maintaining identical functional behavior and electrical specifications.
It operates across −40°C to +125°C (Q-grade), supports cathode voltages from Vref to 36 V, and achieves sharp turn-on characteristics via active output circuitry-enabling stable regulation with minimal external components in closed-loop feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (typical at 25°C); sets precise threshold for feedback networks in regulated power supplies |
| Initial Tolerance | ±0.5% (B grade); enables high-accuracy output voltage setting without trimming in production |
| Temp Range | −40°C to +125°C (Q grade); qualified for under-hood automotive and industrial environments |
| Ref Voltage Drift | ≤14 mV over full temperature range; ensures <±0.56 mV/°C stability in critical sensing applications |
| Dynamic Impedance | 0.2 Ω (typical); minimizes output voltage variation under load transients in shunt-regulated systems |
| Sink Current Range | 1 mA to 100 mA; supports direct interface with optocoupler LEDs and low-power comparators |
| Cathode Voltage Max | 36 V; allows use in wide-input DC-DC converters up to 36 V input rails |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm body size), surface-mount, lead-free, RoHS-compliant. Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE | Shunt current/voltage input node | Connects to regulated output rail; sinks current to maintain reference voltage at REF pin |
| REF | Threshold input relative to ANODE | Internal 2.495 V reference comparator input; sets regulation point when divider ratio matches Vref |
| ANODE | Common reference and return path | Typically tied to system ground or low-side return; defines voltage reference for REF pin |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | 2.5 V to 36 V via two-resistor divider; eliminates need for multiple fixed-voltage references |
| Low Output Noise | Enables clean feedback signals in sensitive analog control loops without added filtering |
| Sharp Turn-On Characteristic | Reduces regulation hysteresis and improves transient response vs. discrete Zener diodes |
| 0.2 Ω Output Impedance | Maintains stable reference voltage under varying cathode current loads (1–100 mA) |
| Zener Replacement Capability | Direct drop-in upgrade path with superior thermal stability and tighter tolerance than 2.5 V Zeners |
Applications
| Automotive Flyback SMPS Regulation | Voltage Monitoring & Supervision |
|---|---|
|
Use Scenario: Secondary-side feedback in isolated 12 V automotive DC-DC converters with optocoupler isolation. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.495 V threshold to drive optocoupler LED current proportional to output voltage. Use Value: Enables ±1% output regulation over −40°C to +125°C without external trimming or compensation. |
Use Scenario: Overvoltage detection on 5 V microcontroller supply rail in industrial PLC modules. IC Role / Device Role / Timing Role: Adjustable comparator reference with hysteresis set by resistor network to trigger shutdown at 5.25 V. Use Value: Replaces dual-Zener + comparator solution with single IC, reducing BOM count and board area by 40%. |
| Programmable Current Source | Onboard Adjustable LDO Reference |
|
Use Scenario: Constant-current driver for LED backlighting in automotive displays using MOSFET + sense resistor. IC Role / Device Role / Timing Role: Precision current-set reference generating stable gate bias for current mirror configuration. Use Value: Delivers ±2% current accuracy across temperature, eliminating calibration in mass production. |
Use Scenario: External reference for adjustable LDOs (e.g., LM317) in test equipment requiring fine-tuned output voltages. IC Role / Device Role / Timing Role: High-stability voltage reference replacing internal bandgap to improve LDO line/load regulation. Use Value: Reduces output drift to <10 ppm/°C vs. standard LDO's internal 50 ppm/°C reference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431QDBVRG4 | Different pinout (REF–ANODE–CATHODE vs. TL432's CATHODE–REF–ANODE); identical electrical specs and Q-grade temp range | Requires PCB layout revision; not pin-compatible; same functional use in feedback loops | Select TL431QDBVRG4 only if legacy TL431 footprint is already implemented and redesign is impractical |
| TL432BQDBVR | Same pinout and package; B-grade (±0.5%) and Q-temp range, but no G4 suffix - differs only in tape-and-reel packaging and moisture sensitivity level | No functional or electrical difference; fully interchangeable in circuit design and thermal performance | TL432BQDBVR is functionally identical to TL432QDBVRG4; choose based on packaging requirements and distributor stock |
Compared with TL431QDBVRG4, TL432QDBVRG4 avoids layout rework when migrating from TL432 footprints, while TL432BQDBVR offers identical performance with alternate packaging-making TL432QDBVRG4 optimal for new Q-grade designs prioritizing pinout continuity and guaranteed green compliance.
Availability
TL432QDBVRG4 is available at Aetrix Electronics and suitable for automotive power conversion, industrial voltage supervision, programmable current sources, and onboard LDO referencing requiring stable component supply across extended temperature ranges.
Supply support for TL432QDBVRG4 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 and embedded processing technologies, with leadership in precision analog ICs and automotive-qualified components.
The TL43x family was designed for high-accuracy, temperature-stable voltage referencing in safety-critical power systems-including automotive, industrial, and telecom infrastructure-where long-term stability and wide-operating-range reliability are mandatory.
FAQ
What is the reference voltage tolerance of TL432QDBVRG4 at 25°C?
The TL432QDBVRG4 has a ±0.5% initial reference voltage tolerance at 25°C (B grade), corresponding to a 2.495 V nominal value with min/max bounds of 2.483 V and 2.507 V. This specification is confirmed in Section 7.13 (Electrical Characteristics, TL432BQ) of the official TI datasheet SLVS543P.
Does TL432QDBVRG4 support operation at 125°C ambient temperature?
Yes, TL432QDBVRG4 is rated for operation from −40°C to +125°C (Q-grade), with full electrical performance guaranteed across that range. Its VI(dev) ≤14 mV over this interval confirms thermal stability suitable for under-hood automotive applications and high-temperature industrial environments.
What is the pin configuration of TL432QDBVRG4 in the SOT-23-3 package?
TL432QDBVRG4 uses a CATHODE–REF–ANODE pinout in SOT-23-3: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. This differs from TL431 (REF–ANODE–CATHODE) and is explicitly documented in the "Pin Configuration and Functions" section of the TI datasheet.
Can TL432QDBVRG4 replace a standard 2.5 V Zener diode?
Yes, TL432QDBVRG4 is explicitly positioned as a Zener replacement, offering superior initial accuracy (±0.5% vs. ±5% typical for Zeners), lower temperature drift (≤14 mV vs. >50 mV), and sharp turn-on characteristics. Its 0.2 Ω dynamic impedance also provides better regulation under varying load conditions than passive Zeners.
What is the maximum cathode voltage rating for TL432QDBVRG4?
The absolute maximum cathode voltage (VK A) for TL432QDBVRG4 is 37 V, with recommended operating range from Vref (≈2.5 V) to 36 V. This allows safe integration into 24 V and 36 V input power systems, including industrial DC-DC converters and battery-powered equipment.
TL432QDBVRG4 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:
- ±2.2%
- 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
TL432QDBVRG4 FAQ
1.How can I place an order for TL432QDBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432QDBVRG4 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 TL432QDBVRG4 reliable?
The price and inventory of TL432QDBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432QDBVRG4 is usually 5 days.
3.What payment methods are accepted for TL432QDBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432QDBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432QDBVRG4?
TL432QDBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432QDBVRG4 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 TL432QDBVRG4?
For technical support, including TL432QDBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432QDBVRG4 requirements.
6.How does Aetrix verify that TL432QDBVRG4 is sourced from the original manufacturer or authorized distributors?
All TL432QDBVRG4 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 TL432QDBVRG4 meets industry standards.
7.What is the process for return or replacement of TL432QDBVRG4?
All TL432QDBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432QDBVRG4, 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 TL432QDBVRG4 part is unused and in its original packaging.
Return procedure for TL432QDBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432QDBVRG4 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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