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Diodes Incorporated FZT549TA
- Part No.:
- FZT549TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT549TA.pdf
- Description:
- TRANS PNP 30V 1A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,464
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Product details
Overview
FZT549TA from Diodes Incorporated is a 30V PNP medium-power transistor in SOT223 package, rated for -1A continuous collector current, with VCE(sat) < -0.5V at -1A and hFE up to 300 at -50mA, used in automotive power control and industrial DC-DC converter switching stages.
For engineers reviewing the FZT549TA datasheet, FZT549TA pinout, FZT549TA application, or FZT549TA equivalent, key selection criteria include its AEC-Q101 qualification, low saturation voltage under high-current drive, thermal resistance of 41.7°C/W on 50mm×50mm copper, and robust ESD HBM rating of 4kV.
Technical Context
This PNP bipolar junction transistor operates in linear or saturated switching mode with guaranteed BVCEO = -30V and VEBO = -7V, supporting reliable operation across -55°C to +150°C ambient range. Its fT = 100MHz enables use in moderate-speed switching applications up to several hundred kHz.
Thermal design is supported by two RθJA ratings: 62.5°C/W (25mm×25mm copper) and 41.7°C/W (50mm×50mm copper), and RθJL = 19.4°C/W confirms efficient heat conduction through the collector lead to PCB copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -30V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration |
| IC (cont.) | -1A - Continuous collector current capability without derating at TA = 25°C |
| VCE(sat) | < -0.5V @ -1A/ -100mA - Low conduction loss enabling high-efficiency switching in power stages |
| hFE | 70–300 - Wide DC current gain range across IC = -50mA to -2A, supporting stable biasing in analog and digital driver circuits |
| fT | 100MHz - Transition frequency confirming usable bandwidth for PWM control signals up to ~10MHz |
| RθJA | 41.7°C/W - Thermal resistance on 50mm×50mm 2oz copper, defining maximum power dissipation at target junction temperature |
| ESD HBM | 4000V - Human Body Model rating ensuring robustness during board assembly and handling |
Pinout & Package
Package: SOT223 - Surface-mount plastic package with exposed collector tab for enhanced thermal transfer; 0.112g mass; UL 94V-0 flammability rating; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal in PNP configuration | Connected to higher potential rail; carries full load current when device is ON |
| Base (B) | Control input for minority-carrier injection | Requires ~-100mA drive to saturate at -1A; VBE(sat) = -1.25V defines required drive voltage headroom |
| Collector (C) | Main current output terminal | Internally connected to exposed metal tab; must be soldered to large copper pour for thermal management |
| Tab / Heat Sink Pad | Thermal and electrical connection to collector | Provides primary thermal path to PCB; electrically identical to collector pin; requires isolation if mounting to heatsink |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive power electronics per stress test requirements including HTOL, TC, HAST, and ESD |
| Low VCE(sat) | < -0.5V at -1A reduces conduction losses by >30% vs. standard PNP transistors with VCE(sat) > -0.7V |
| High hFE stability | hFE ≥ 70 at -1A ensures reliable saturation with modest base drive, minimizing gate-driver complexity |
| Green construction | Halogen- and antimony-free molding compound (<900ppm Br/Cl, <1000ppm Sb) meets automotive environmental compliance mandates |
Applications
| Automotive Door Lock Actuator | Industrial 24V DC-DC Converter |
|---|---|
Use Scenario: Driving solenoid loads in vehicle door latch modules requiring intermittent 1A pulses at 12V. IC Role / Device Role / Timing Role: PNP switch controlling ground-return path for solenoid coil; activated via microcontroller GPIO. Use Value: Low VCE(sat) minimizes heat generation during 500ms activation cycles; AEC-Q101 qualification ensures reliability over 15-year vehicle lifetime. | Use Scenario: High-side switch in synchronous buck converter auxiliary rail for sensor biasing. IC Role / Device Role / Timing Role: Medium-power PNP pass element in linear post-regulator stage delivering stable 5V/500mA. Use Value: hFE ≥ 100 at -500mA enables direct MCU GPIO drive without external buffer; RθJL = 19.4°C/W supports thermal coupling to chassis ground. |
| LED Driver for Commercial Lighting | Power Sequencing Controller |
Use Scenario: Constant-current sink for high-brightness LED strings in parking garage luminaires. IC Role / Device Role / Timing Role: Linear current regulator operating in active region; modulated via PWM dimming signal. Use Value: Tight hFE distribution (70–300) allows predictable current setting with single emitter resistor; -55°C to +150°C rating supports outdoor enclosure operation. | Use Scenario: Enabling/disabling subsystem power rails in programmable logic controller backplane. IC Role / Device Role / Timing Role: Discrete power switch sequencing multiple 3.3V/5V/12V domains with controlled turn-on delay. Use Value: VCEO = -30V provides 2× margin over 12V rail transients; ESD HBM = 4kV prevents latch-up during hot-swap events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN25050DFHTA | SOT23 package; lower IC = -500mA; VCE(sat) = -0.45V @ -500mA | Not suitable for >700mA loads; limited thermal mass for sustained conduction | Select only for space-constrained low-current biasing where SOT223 footprint is unavailable |
| MJD2955T4G | TO-220 package; IC = -12A; VCE(sat) = -1.2V @ -8A; no AEC-Q101 qualification | Over-specified current capacity; higher saturation loss; unsuitable for automotive qualification-critical designs | Prefer for non-automotive high-power linear regulators where thermal mass outweighs efficiency concerns |
Compared with ZXTN25050DFHTA and MJD2955T4G, FZT549TA uniquely balances AEC-Q101 compliance, SOT223 thermal performance, and -1A capability-making it optimal for automotive body electronics and industrial power sequencing where reliability, size, and efficiency intersect.
Availability
FZT549TA is available at Aetrix Electronics and suitable for automotive door lock actuators, industrial 24V DC-DC converters, and commercial LED lighting systems requiring stable component supply across multi-year production cycles.
Supply support for FZT549TA 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 and manufacturing operations across Asia and the Americas.
FZT549TA belongs to Diodes' automotive-qualified bipolar transistor product line, engineered specifically for high-reliability power switching in harsh-environment applications including body control modules and power distribution units.
FAQ
What is the maximum allowable junction temperature for FZT549TA?
The FZT549TA has an operating junction temperature range of -55°C to +150°C. Its absolute maximum TJ is +150°C, and sustained operation above this threshold risks permanent degradation. Derating begins at TA > 25°C per the RθJA curve in DS33138 Rev.3, page 4.
Can FZT549TA replace a generic PNP transistor like BC807 in a 1A load circuit?
No-BC807 is rated for only -500mA continuous current and lacks AEC-Q101 qualification. FZT549TA's -1A rating, lower VCE(sat), and automotive qualification make it functionally superior but not drop-in compatible due to SOT223 vs. SOT23 footprint and different pinout (E-B-C vs. E-C-B).
Is the collector tab electrically isolated from the PCB copper pour?
No-the collector tab is electrically connected to the collector terminal and must be soldered directly to a copper pour serving as both thermal path and circuit node. If isolation is required, a thermally conductive but electrically insulating pad must be used between tab and PCB.
Does FZT549TA support pulsed operation beyond its continuous IC rating?
Yes-its peak pulse current ICM is -2A, specified under pulsed conditions (≤300µs pulse width, ≤2% duty cycle). This enables short-duration surge handling in motor commutation or inrush limiting, provided average power remains within PD = 3W limits.
FZT549TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 750mV @ 200mA, 2A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 500mA, 2V
- Power - Max:
- 2 W
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT549TA FAQ
1.How can I place an order for FZT549TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT549TA 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 FZT549TA reliable?
The price and inventory of FZT549TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT549TA is usually 5 days.
3.What payment methods are accepted for FZT549TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT549TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT549TA?
FZT549TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT549TA 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 FZT549TA?
For technical support, including FZT549TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT549TA requirements.
6.How does Aetrix verify that FZT549TA is sourced from the original manufacturer or authorized distributors?
All FZT549TA 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 FZT549TA meets industry standards.
7.What is the process for return or replacement of FZT549TA?
All FZT549TA units undergo pre-shipment inspection (PSI). If there is an issue with FZT549TA, 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 FZT549TA part is unused and in its original packaging.
Return procedure for FZT549TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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