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Diodes Incorporated ZTL432BFFTA
- Part No.:
- ZTL432BFFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SOT-23-3 Flat Leads
- Datasheet:
-
ZTL432BFFTA.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23F
- Quantity:
- Payment:
- Shipping:
Inventory:1,958
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Product details
Overview
ZTL432BFFTA from Diodes Incorporated is a precision adjustable shunt regulator in SOT23F package, featuring 0.5% reference voltage tolerance at +25°C, 2.5V nominal reference voltage, -40°C to +125°C operating temperature range, and 100mA cathode sink current capability. It replaces zener diodes in feedback loops of linear regulators and opto-coupler-based isolated power supplies.
For engineers reviewing the ZTL432BFFTA datasheet, ZTL432BFFTA pinout, ZTL432BFFTA application, or ZTL432BFFTA equivalent, key selection criteria include reference accuracy over temperature, dynamic output impedance (0.2Ω typ), cathode voltage range (2.5–20V), and SOT23F pin compatibility with TL432 variants.
Technical Context
The ZTL432BFFTA implements a bandgap-referenced error amplifier with internal 2.5V reference, enabling precise voltage regulation via external resistor divider. Its architecture supports stable operation with ≥4.7nF anode-to-cathode capacitance and exhibits <34mV reference deviation across -40°C to +125°C.
Unlike the ZTL431, the ZTL432 uses reversed pinout in SOT23/SOT23F packages: Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Reference - critical for PCB layout and drop-in replacement verification. It shares functional equivalence with TL432 but extends maximum cathode voltage to 20V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.487–2.513V at +25°C (B-grade 0.5% tolerance; sets minimum regulated output) |
| Cathode Voltage Range | 2.5V to 20V (supports wide-output adjustable shunt regulation without external clamp) |
| Sink Current Range | 1–100mA (enables direct control of optocoupler LED or series pass transistor base) |
| Dynamic Output Impedance | 0.2Ω typical (ensures low output voltage variation under load transients) |
| Temp. Range | -40°C to +125°C (validates use in automotive under-hood and industrial motor drive environments) |
| Ref Input Current | 2–4μA typical (minimizes divider resistor power loss and thermal drift) |
| Min Cathode Current | 0.4–0.6mA (guarantees regulation start-up even with high-resistance feedback networks) |
Pinout & Package
Package: SOT23F (3-pin, flat lead, moisture sensitivity level 1; thermal resistance θJA = 138°C/W, PDIS = 900mW at TA = +25°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode | Primary current sink node; connects to supply rail or collector/drain of series pass element |
| Pin 2 | Anode | Return path to ground or low-side reference; must be tied to system GND for proper biasing |
| Pin 3 | Reference | High-impedance input sensing point; connected to resistor divider midpoint for output voltage setting |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% initial reference tolerance | Reduces output voltage calibration burden in precision power supplies and sensor references |
| 0.2Ω typical dynamic impedance | Maintains tight regulation during fast load steps without requiring large output capacitance |
| -40°C to +125°C operation | Enables deployment in extended-temperature industrial PLCs and automotive body control modules |
| Stable with ≥4.7nF anode–cathode cap | Simplifies EMI filtering and loop compensation in isolated flyback and forward converters |
| Lead-free, halogen-free, RoHS-compliant | Meets IPC-J-STD-020 moisture sensitivity and environmental compliance for global manufacturing |
Applications
| Opto-Coupler Linearization | Linear Regulator Feedback |
|---|---|
|
Use Scenario: Isolated DC-DC converter using PC817 optocoupler and TL431-like shunt reference on secondary side. IC Role / Device Role / Timing Role: Precision voltage reference and error amplifier driving optocoupler LED current. Use Value: Enables ±1% output voltage regulation across line/load/temperature by replacing discrete zener + transistor with single 0.5%-tolerant device. |
Use Scenario: Adjustable 3.3V/5V/12V linear regulator using LM317 or LT1086 with external feedback network. IC Role / Device Role / Timing Role: High-accuracy shunt reference replacing 2.5V bandgap in regulator feedback divider. Use Value: Improves output accuracy from ±2% (zener-based) to ±0.5% and reduces temperature-induced drift by 50% vs. standard zeners. |
| Overvoltage Protection Circuit | Variable Reference Generator |
|
Use Scenario: Microcontroller-supervised power rail monitoring where VCC > 5.5V triggers shutdown via comparator input. IC Role / Device Role / Timing Role: Adjustable threshold reference feeding comparator input; set to 5.5V via R1/R2 divider. Use Value: Provides stable, temperature-invariant trip point independent of MCU VREF, eliminating need for external precision voltage reference IC. |
Use Scenario: Programmable test equipment requiring user-selectable analog reference voltages between 2.5V and 20V. IC Role / Device Role / Timing Role: Core adjustable reference source; R1/R2 values selected via DIP switch or DAC-controlled resistors. Use Value: Delivers 0.5% accuracy across full 2.5–20V range without trimming, reducing calibration time and component count vs. multi-zener solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL432CDBVR | Same pinout (SOT23), but 1% reference tolerance (C-grade); max cathode voltage 36V; wider temp range (-40°C to +125°C same) | Higher voltage headroom (36V vs. 20V) suits 24V industrial rails; lower accuracy acceptable in non-critical feedback paths | Select when higher cathode voltage rating is required and 1% tolerance suffices for cost-sensitive designs |
| ZTL431BFFTA | Same B-grade 0.5% tolerance and SOT23F package, but ZTL431 pinout (Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Ref) | Requires PCB layout revision due to reversed anode/cathode pins; identical electrical performance otherwise | Choose only if legacy ZTL431 footprint is fixed and redesign is prohibited; verify pin mapping before placement |
Compared with TL432CDBVR and ZTL431BFFTA, ZTL432BFFTA uniquely balances 0.5% accuracy, 20V cathode rating, and SOT23F pinout optimized for TL432-compatible layouts-making it ideal for new designs targeting precision and drop-in manufacturability.
Availability
ZTL432BFFTA is available at Aetrix Electronics and suitable for isolated power supplies, linear regulator feedback networks, overvoltage protection circuits, and programmable reference generators requiring stable component supply and guaranteed long-term availability.
Supply support for ZTL432BFFTA 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 power management, signal integrity, and protection devices for industrial, computing, and consumer markets.
ZTL432 belongs to Diodes' precision reference product line, designed specifically for cost-sensitive yet accuracy-demanding shunt regulation in power conversion, feedback control, and voltage monitoring applications.
FAQ
What is the minimum cathode current required for regulation in ZTL432BFFTA?
The ZTL432BFFTA requires a minimum cathode current of 0.4–0.6mA to maintain regulation, as specified in the Electrical Characteristics table under IKA(MIN). This ensures reliable turn-on even with high-value feedback resistors (e.g., 1MΩ dividers), making it suitable for low-power standby circuits where quiescent current matters.
Can ZTL432BFFTA replace TL432 in existing SOT23 designs?
No-ZTL432BFFTA uses SOT23F package with Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Reference, whereas TL432 in SOT23 has Pin 1 = Cathode, Pin 2 = Reference, Pin 3 = Anode. Physical pinout mismatch prevents direct replacement without PCB revision; ZTL432BFTA (SOT23) is the pin-compatible variant.
How does the 0.2Ω dynamic output impedance affect circuit stability?
The 0.2Ω typical dynamic output impedance minimizes voltage droop during rapid cathode current changes, improving transient response in feedback loops. When combined with ≥4.7nF anode-to-cathode capacitance, it ensures phase margin >45° across 10Hz–1MHz, preventing oscillation in optocoupler-coupled SMPS designs per Figure 4 stability boundary data.
Is ZTL432BFFTA qualified for automotive applications?
ZTL432BFFTA operates from -40°C to +125°C and meets AEC-Q200 stress test requirements for passive components, but Diodes Incorporated does not list it in their official AEC-Q100 qualified portfolio. For automotive safety-critical systems, consult Diodes' AEC-Q100-certified alternatives such as AP2112K-ADJ or ZLDO1117.
ZTL432BFFTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- SOT-23-3 Flat Leads
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23F
ZTL432BFFTA FAQ
1.How can I place an order for ZTL432BFFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTL432BFFTA 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 ZTL432BFFTA reliable?
The price and inventory of ZTL432BFFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTL432BFFTA is usually 5 days.
3.What payment methods are accepted for ZTL432BFFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTL432BFFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTL432BFFTA?
ZTL432BFFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTL432BFFTA 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 ZTL432BFFTA?
For technical support, including ZTL432BFFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTL432BFFTA requirements.
6.How does Aetrix verify that ZTL432BFFTA is sourced from the original manufacturer or authorized distributors?
All ZTL432BFFTA 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 ZTL432BFFTA meets industry standards.
7.What is the process for return or replacement of ZTL432BFFTA?
All ZTL432BFFTA units undergo pre-shipment inspection (PSI). If there is an issue with ZTL432BFFTA, 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 ZTL432BFFTA part is unused and in its original packaging.
Return procedure for ZTL432BFFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZTL432BFFTA 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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