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Diodes Incorporated ZTL432BQFTA
- Part No.:
- ZTL432BQFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZTL432BQFTA.pdf
- Description:
- IC VREF SHUNT 2.5V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,580
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Product details
Overview
ZTL432BQFTA from Diodes Incorporated is an automotive-grade adjustable precision shunt regulator in SOT23 package, featuring 0.5% reference voltage tolerance at +25°C, -40°C to +125°C operating range, 2.5V to 20V programmable output, and 100mA sink current capability. It serves as a high-stability voltage reference in feedback loops of isolated DC-DC converters and linear regulators.
For engineers reviewing the ZTL432BQFTA datasheet, ZTL432BQFTA pinout, ZTL432BQFTA application, or ZTL432BQFTA equivalent, key selection criteria include its AEC-Q100 qualification, SOT23 pinout distinction from ZTL431BQ, 0.2Ω dynamic output impedance, and stability with ≥4.7nF anode–cathode capacitance.
Technical Context
The ZTL432BQFTA implements a bandgap-based precision reference with internal error amplifier and NPN output stage, configured as a three-terminal shunt regulator. Its cathode-anode voltage range (2.5V–20V) and low 0.2Ω typical dynamic impedance enable stable regulation across wide load and line variations.
Unlike ZTL431BQ, the ZTL432BQFTA uses a modified SOT23 pinout (Ref/Anode/N/C instead of Ref/Cathode/Anode), requiring PCB layout revision for drop-in replacement. It maintains functional equivalence to TL432 but extends max cathode voltage to 20V and supports automotive ambient conditions up to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Tolerance | ±0.5% at +25°C (B-grade); ensures tight initial setpoint for feedback accuracy in safety-critical power supplies |
| VKA Range | 2.5V to 20V; enables programmable output voltage using two external resistors without external op-amp |
| IKA Max | 100mA continuous sink current; supports direct regulation of medium-power secondary-side circuits |
| RZ Dynamic Impedance | 0.2Ω typical; minimizes output voltage deviation under fast load transients in closed-loop systems |
| Temp Range | -40°C to +125°C ambient; qualified per AEC-Q100 Grade 1 for under-hood automotive applications |
| VDEV over Temp | ≤34mV (-40°C to +125°C); limits reference drift in wide-temperature industrial control systems |
| ESD Rating | 2kV HBM; meets IEC 61000-4-2 level for robustness in manufacturing and field environments |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), 2.9mm × 1.3mm × 1.0mm body, matte tin-plated leads, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Ref) | Reference Input | High-impedance input sensing divider node; connects to resistor network midpoint for voltage setting |
| 2 (Anode) | Anode Terminal | Low-side return path; must be connected to system ground or common rail in shunt configuration |
| 3 (N/C) | No Connect | Internally unconnected; must remain floating-no external connection permitted |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade 1 (−40°C to +125°C), PPAP-capable, manufactured in IATF 16949-certified facilities |
| Stability with Capacitance | Guaranteed stable with ≥4.7nF capacitor between anode and cathode-enables robust noise filtering |
| Low Output Impedance | 0.2Ω typical dynamic impedance reduces output ripple and improves transient response |
| Green Packaging | Totally lead-free, halogen- and antimony-free per Diodes' "Green" definition (<900ppm Br/Cl, <1000ppm Sb) |
| Wide Sink Current Range | Operates reliably from 0.4mA minimum to 100mA maximum cathode current-supports diverse load profiles |
Applications
| Optocoupler Linearization | Isolated DC-DC Feedback |
|---|---|
Use Scenario: Improving linearity and temperature stability of optocoupler-based feedback in flyback converters. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.5V reference to optocoupler LED driver circuit. Use Value: Reduces cross-regulation error by 40% vs. standard zener diodes due to 0.5% VREF tolerance and low tempco. |
Use Scenario: Secondary-side voltage sensing and error amplification in automotive 12V-to-5V isolated buck converters. IC Role / Device Role / Timing Role: Adjustable shunt regulator generating precise feedback signal sent via optocoupler to primary-side controller. Use Value: Enables ±1% output regulation over full temperature and line range, meeting ASIL-B functional safety requirements. |
| Overvoltage Protection | Programmable Threshold Detector |
Use Scenario: Monitoring battery voltage in 24V commercial vehicle systems to trigger shutdown above 28.5V. IC Role / Device Role / Timing Role: Adjustable shunt element in comparator reference leg, triggering protection when VKA exceeds threshold. Use Value: Achieves 0.1V trip accuracy across −40°C to +125°C using external resistor ratio and B-grade reference tolerance. |
Use Scenario: Setting accurate switching thresholds in single-supply comparators for HVAC sensor interface circuits. IC Role / Device Role / Timing Role: Programmable reference source feeding non-inverting input of comparator to define hysteresis window. Use Value: Delivers 2.5V–20V adjustable threshold with <34mV total drift over temperature-eliminates need for trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL432ACDBVR | Non-automotive grade; 1.5% VREF tolerance; max VKA = 18V; no AEC-Q100 qualification | Limited to industrial/commercial power supplies; not suitable for automotive ECU or ADAS modules | Select only for cost-sensitive non-automotive designs where AEC-Q100 and 0.5% tolerance are unnecessary |
| ZTL431BQFTA | Same electrical specs but SOT23 pinout: Ref/Cathode/Anode (vs. Ref/Anode/N/C); requires PCB redesign | Compatible in same footprint but incompatible pin mapping-requires netlist and layout update | Choose only if legacy ZTL431 design reuse is prioritized and board revision is feasible |
Compared with TL432ACDBVR and ZTL431BQFTA, the ZTL432BQFTA uniquely delivers automotive qualification, tighter 0.5% reference tolerance, and SOT23 pinout optimized for new designs requiring N/C terminal isolation-making it the preferred choice for next-generation automotive power management.
Availability
ZTL432BQFTA is available at Aetrix Electronics and suitable for automotive power supplies, isolated DC-DC converters, and overvoltage protection circuits requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.
Supply support for ZTL432BQFTA 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.
The ZTL43x series belongs to Diodes' automotive-qualified precision reference product line, designed specifically for feedback, protection, and threshold-setting functions in harsh-environment power systems.
FAQ
What is the function of Pin 3 (N/C) on ZTL432BQFTA?
Pin 3 is internally unconnected and must remain floating-no external connection is allowed. Unlike ZTL431BQ's Cathode-on-Pin-2 configuration, this N/C pin enables distinct routing separation in high-density automotive PCB layouts and prevents accidental shorting during assembly.
Can ZTL432BQFTA replace TL432 in existing designs?
Yes, electrically-but only with careful validation. ZTL432BQFTA matches TL432's 2.5V–20V range and 100mA sink capability, yet adds AEC-Q100 qualification and tighter 0.5% tolerance. However, its SOT23 pinout differs (Ref/Anode/N/C), so PCB layout and schematic must be updated to avoid misconnection.
What capacitor value ensures stability in ZTL432BQFTA applications?
A minimum 4.7nF ceramic capacitor between anode and cathode is required for guaranteed stability across all operating conditions. This value suppresses oscillation in the typical instability zone shown in the datasheet's gain-vs-frequency plot and is validated for loads up to 100mA.
How does ZTL432BQFTA differ from ZTL431BQ beyond pinout?
Electrically identical-same VREF tolerance, temperature drift, dynamic impedance, and sink current. The sole difference is pin assignment in SOT23: ZTL432BQFTA places Anode on Pin 2 and leaves Pin 3 N/C, whereas ZTL431BQ places Cathode on Pin 2. This change isolates the anode node for improved noise immunity in sensitive feedback paths.
ZTL432BQFTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- 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):
- 2.5V
- Voltage - Output (Max):
- 20 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ZTL432BQFTA FAQ
1.How can I place an order for ZTL432BQFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTL432BQFTA 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 ZTL432BQFTA reliable?
The price and inventory of ZTL432BQFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTL432BQFTA is usually 5 days.
3.What payment methods are accepted for ZTL432BQFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTL432BQFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTL432BQFTA?
ZTL432BQFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTL432BQFTA 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 ZTL432BQFTA?
For technical support, including ZTL432BQFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTL432BQFTA requirements.
6.How does Aetrix verify that ZTL432BQFTA is sourced from the original manufacturer or authorized distributors?
All ZTL432BQFTA 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 ZTL432BQFTA meets industry standards.
7.What is the process for return or replacement of ZTL432BQFTA?
All ZTL432BQFTA units undergo pre-shipment inspection (PSI). If there is an issue with ZTL432BQFTA, 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 ZTL432BQFTA part is unused and in its original packaging.
Return procedure for ZTL432BQFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZTL432BQFTA Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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