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Diodes Incorporated FZT493ATC
- Part No.:
- FZT493ATC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT493ATC.pdf
- Description:
- TRANS NPN 100V 1A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,371
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Product details
Overview
FZT493ATC from Diodes Incorporated is a 60V NPN medium-power high-gain transistor in SOT223 package, rated for 1A continuous collector current, 2A peak pulse current, and DC current gain >500 at IC = 150mA. It serves as a general-purpose switching or linear amplification device in industrial power supplies, LED drivers, and motor control circuits where robust voltage margin and thermal stability are required.
For engineers reviewing the FZT493ATC datasheet, FZT493ATC pinout, FZT493ATC application, or FZT493ATC equivalent, key selection criteria include VCEO (60V), hFE (300–1200), RθJL (39°C/W), VCE(sat) ≤ 500mV at IC = 1A/IB = 100mA, and AEC-Q101 qualification for automotive-adjacent reliability.
Technical Context
This NPN bipolar junction transistor operates with a minimum BVCEO of 60V and supports linear or saturated switching modes up to 1A DC. Its high hFE (up to 1200 at low IC) enables low-base-drive designs, while fT = 150MHz ensures usable bandwidth in moderate-speed switching applications.
Thermal performance is defined by RθJL = 39°C/W (junction-to-leads), enabling effective heat conduction through the collector lead when mounted on PCB copper. ESD ratings meet JEDEC HBM Class 3A (4kV) and MM (400V), supporting handling in standard manufacturing environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum safe collector-emitter voltage before breakdown; enables use in 48V industrial bus and 24V motor drive stages. |
| IC (continuous) | 1 A - Sustained collector current capability; supports load switching without forced cooling in compact SOT223 footprint. |
| hFE @ IC=150mA | 500 min - High DC current gain reduces base drive requirements and simplifies driver circuit design. |
| VCE(sat) @ IC=1A | ≤500 mV - Low saturation voltage minimizes conduction loss and self-heating during switching. |
| RθJL | 39 °C/W - Junction-to-leads thermal resistance allows direct heat transfer from die to PCB copper via collector lead. |
| fT | 150 MHz - Transition frequency supports switching frequencies up to ~10–20 MHz in optimized layouts. |
| ESD HBM | 4000 V - Human Body Model rating confirms robustness against common electrostatic discharge events in assembly. |
Pinout & Package
Package: SOT223 - Surface-mount plastic package with exposed collector tab for thermal and electrical connection; 3-pin configuration (Emitter, Base, Collector); 0.112 g mass; UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (Tab) | Main current output path and thermal interface | Exposed metal tab electrically connected to collector; must be soldered to large copper pour for thermal management. |
| Base | Control input for transistor biasing | Receives base current to enable or modulate collector current; requires current-limiting resistor in most applications. |
| Emitter | Current return path and reference node | Typically grounded or connected to low-side return; establishes emitter-follower or common-emitter topology. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-adjacent reliability including temperature cycling, HTOL, and ESD stress-suitable for industrial control modules requiring extended lifetime. |
| High hFE > 500 @ IC = 150mA | Reduces base drive current requirement by ~2× vs. standard gain transistors, lowering driver component count and power loss. |
| VCEO = 60V with BVCEO = 120V | Provides 2× voltage safety margin over 24–48V system rails, improving surge tolerance and long-term reliability. |
| Green, halogen/antimony-free | Meets RoHS 2 and JEDEC J-STD-020 Level 1 moisture sensitivity-enables lead-free reflow without baking or special handling. |
Applications
| Industrial Power Supply | LED Constant-Current Driver |
|---|---|
Use Scenario: Regulating output current in offline AC-DC flyback auxiliary supplies or DC-DC post-regulators. IC Role / Device Role / Timing Role: NPN switch controlling feedback loop or driving optocoupler base in isolated regulation schemes. Use Value: High hFE and low VCE(sat) reduce base drive losses and improve efficiency at 100–500mA load ranges. | Use Scenario: Linear constant-current sink for mid-power white LEDs in signage or architectural lighting. IC Role / Device Role / Timing Role: Pass element in adjustable current mirror or emitter-follower configuration with sense-resistor feedback. Use Value: Stable hFE across temperature (−55°C to +150°C) maintains current accuracy without active compensation. |
| Brushed DC Motor Control | Automotive HVAC Blower Interface |
Use Scenario: Low-side switching of 12V/24V brushed motors in factory automation actuators. IC Role / Device Role / Timing Role: Saturated switch in half-bridge or single-ended drive stage; handles PWM up to 20kHz. Use Value: RθJL = 39°C/W and PD = 3W (with 50mm² copper) allow reliable operation without heatsink at 500mA–1A loads. | Use Scenario: Interface between microcontroller GPIO and blower motor in passenger cabin HVAC systems. IC Role / Device Role / Timing Role: Level-shifting and current amplification stage driving motor coil directly from 3.3V/5V logic. Use Value: AEC-Q101 qualification and 4kV HBM ESD rating ensure compatibility with automotive manufacturing and field reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN25040DFH | Higher VCEO (100V), lower hFE (100–400), SOT223-3 package, no AEC-Q101 rating | Better suited for higher-voltage flyback snubbers but lacks automotive qualification | Select when >60V blocking is needed and AEC-Q101 is not required |
| MJD44H11T4G | TO-220 package, VCEO = 80V, hFE = 75–200, higher PD (1.5W free-air), no AEC-Q101 | Requires heatsink for >500mA; larger footprint; better for legacy through-hole designs | Select when board space permits TO-220 and higher voltage margin is prioritized over surface-mount density |
Compared with ZXTN25040DFH and MJD44H11T4G, FZT493ATC uniquely balances high gain, AEC-Q101 compliance, and SOT223 thermal efficiency-making it optimal for space-constrained, reliability-critical 24–48V industrial and automotive-adjacent switching.
Availability
FZT493ATC is available at Aetrix Electronics and suitable for industrial power supplies, LED drivers, brushed DC motor interfaces, and automotive HVAC control modules requiring stable component supply and long-term sourcing continuity.
Supply support for FZT493ATC 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
FZT493ATC belongs to Diodes' FZT series of high-gain, medium-power bipolar transistors designed specifically for industrial switching, power conversion, and automotive-qualified signal conditioning applications.
FAQ
Is FZT493ATC pin-compatible with FZT491A or FZT495A?
Yes-FZT493ATC shares identical SOT223 pinout (E-B-C) and mechanical footprint with FZT491A and FZT495A. However, VCEO differs: FZT491A is 40V, FZT495A is 100V. Substitution requires verification of voltage margin in the target circuit.
What is the maximum recommended PCB copper area for thermal performance?
For 3W power dissipation, Diodes recommends mounting the collector tab on ≥50mm × 50mm of 2oz copper on FR4. With that layout, RθJA drops to 41.7°C/W, limiting junction rise to ~125°C at TA = 25°C and full 1A DC load.
Does FZT493ATC support PWM switching above 10kHz?
Yes-its fT = 150MHz and typical turn-on/off times (from datasheet curves) support clean switching up to 20kHz in properly laid-out circuits. Layout must minimize base-emitter loop inductance and use low-inductance collector routing to avoid ringing.
Can FZT493ATC replace a MOSFET in low-side switching?
It can-but only where gate drive simplicity and cost outweigh efficiency needs. Unlike MOSFETs, it requires sustained base current (e.g., 10mA for 1A IC), increasing driver loss. Use only when hFE-driven simplicity justifies ~0.5V VCE(sat) penalty versus <0.1V RDS(on) MOSFETs.
FZT493ATC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 250mA, 10V
- Power - Max:
- 2 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT493ATC FAQ
1.How can I place an order for FZT493ATC through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT493ATC 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 FZT493ATC reliable?
The price and inventory of FZT493ATC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT493ATC is usually 5 days.
3.What payment methods are accepted for FZT493ATC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT493ATC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT493ATC?
FZT493ATC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT493ATC 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 FZT493ATC?
For technical support, including FZT493ATC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT493ATC requirements.
6.How does Aetrix verify that FZT493ATC is sourced from the original manufacturer or authorized distributors?
All FZT493ATC 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 FZT493ATC meets industry standards.
7.What is the process for return or replacement of FZT493ATC?
All FZT493ATC units undergo pre-shipment inspection (PSI). If there is an issue with FZT493ATC, 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 FZT493ATC part is unused and in its original packaging.
Return procedure for FZT493ATC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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