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Diodes Incorporated FZT1149ATC
- Part No.:
- FZT1149ATC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT1149ATC.pdf
- Description:
- TRANS PNP 25V 4A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,098
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Product details
Overview
FZT1149ATC from Diodes Incorporated is a 25V PNP medium-power high-gain transistor in SOT223 package, rated for -4A continuous collector current, -25V VCEO, and delivering hFE ≥195 at -2A; it serves as a robust switching or linear amplification device in automotive power management and industrial DC-DC converter output stages.
For engineers reviewing the FZT1149ATC datasheet, FZT1149ATC pinout, FZT1149ATC application, or FZT1149ATC equivalent, key selection criteria include verified RCE(sat) ≤260 mΩ at -2A, AEC-Q101 qualification, thermal resistance RθJA = 41.7°C/W (52 mm × 52 mm 2 oz Cu), and safe operating area up to -25V / -4A DC.
Technical Context
This PNP bipolar junction transistor operates with emitter-grounded configuration and supports high-current switching via low-saturation voltage design: VCE(sat) = -230 mV typical at -2A/-30mA base drive. Its fT = 135 MHz enables stable operation in moderate-frequency switching applications up to several hundred kHz.
The device features rugged thermal performance-RθJL = 10.9°C/W to lead-and is characterized under pulsed conditions (300 µs, ≤2% duty cycle) for hFE and VCE(sat), ensuring reliable gain and conduction behavior across its full -55°C to +150°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -25 V - Maximum allowable collector-emitter voltage before breakdown in common-emitter configuration |
| IC (continuous) | -4 A - Sustained collector current capability without thermal runaway on standard 52 mm × 52 mm 2 oz Cu PCB |
| hFE @ -2A | ≥195 - Confirmed DC current gain enabling efficient base drive sizing for high-current switching |
| RCE(sat) | ≤260 mΩ - Low on-resistance reduces conduction loss and self-heating in power stage applications |
| fT | 135 MHz - Transition frequency supporting stable gain in high-speed switching and analog amplification |
| RθJA | 41.7 °C/W - Thermal resistance defining junction-to-ambient temperature rise per watt dissipated |
| ESD HBM | 4,000 V - Robust electrostatic discharge immunity per JEDEC JESD22-A114, suitable for automated assembly |
Pinout & Package
Package: SOT223 - Surface-mount plastic package with exposed collector tab for enhanced thermal dissipation; 0.112 g mass; UL 94V-0 rated molding compound; matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal | Connected to ground or low-side reference; carries full load current in common-emitter switch |
| Base (B) | Control input | Receives negative bias current to turn on PNP; requires external current-limiting resistor |
| Collector (C) | High-current output terminal | Connected to load supply rail; thermally bonded to PCB copper for heat removal |
| Tab / Collector Pad | Thermal and electrical connection | Exposed metal pad electrically tied to collector; must be soldered to ≥52 mm² 2 oz Cu for rated power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive power electronics per stress test requirements including HTOL, TC, and ESD |
| Low RCE(sat) | ≤260 mΩ at -2A ensures <520 mW conduction loss, reducing thermal burden in compact layouts |
| High hFE stability | hFE ≥195 maintained at -2A enables predictable base drive design without over-sizing driver circuits |
| Green construction | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb); RoHS 2 compliant with lead-free finish |
Applications
| Automotive Body Control Module (BCM) | Industrial DC-DC Converter Output Stage |
|---|---|
Use Scenario: Driving solenoids, relays, and LED arrays in vehicle door modules and lighting control units. IC Role / Device Role / Timing Role: High-current PNP switch controlling 12V loads with fast turn-on/turn-off (ton/toff ≤ 420 ns). Use Value: AEC-Q101 qualification and -55°C to +150°C operation ensure reliability across automotive ambient extremes. | Use Scenario: Synchronous rectifier or pre-regulator switch in isolated 24V-to-5V flyback converters. IC Role / Device Role / Timing Role: Medium-power PNP pass element handling up to -4A continuous current in linear or quasi-resonant topologies. Use Value: RCE(sat) ≤260 mΩ minimizes dropout and improves efficiency versus higher-RDS(on) MOSFET alternatives at low VCE. |
| Programmable Logic Controller (PLC) Output Driver | Medical Power Supply Sequencing |
Use Scenario: Switching 24V industrial sensors and actuators in DIN-rail mounted PLC I/O modules. IC Role / Device Role / Timing Role: Discrete PNP output stage providing galvanically isolated, current-limited load control. Use Value: 4 kV HBM ESD rating and moisture sensitivity level 1 support reflow-compatible manufacturing without special handling. | Use Scenario: Enabling/disabling auxiliary rails during startup and fault recovery in Class II medical AC-DC supplies. IC Role / Device Role / Timing Role: Precision-controlled PNP enable switch with tight VBE(sat) (-960 mV typ.) for accurate sequencing timing. Use Value: Stable hFE across temperature ensures consistent turn-on threshold and avoids unintended brown-out behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN25050DFH | SOT223 PNP, VCEO = -50V, IC = -3A, hFE = 200 @ -1A, RCE(sat) = 300 mΩ @ -1A | Higher voltage rating but lower current and higher saturation voltage; less suitable for 4A continuous loads | Select when >-25V blocking is required and peak current remains below -3A |
| MJD44H11T4G | TO-252 PNP, VCEO = -80V, IC = -8A, hFE = 75 @ -4A, RCE(sat) = 400 mΩ @ -4A | Larger package, higher voltage/current ratings but significantly lower gain and higher saturation loss | Choose for legacy TO-252 footprint compatibility or where higher VCEO is mandatory |
Compared with ZXTN25050DFH and MJD44H11T4G, FZT1149ATC delivers superior current-handling (–4A), lowest RCE(sat) (≤260 mΩ), and highest hFE stability at high current-making it optimal for space-constrained, thermally demanding automotive and industrial switching where gain predictability and conduction efficiency are critical.
Availability
FZT1149ATC is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC-DC converters, programmable logic controller outputs, and medical power supply sequencing requiring stable component supply and AEC-Q101 compliance.
Supply support for FZT1149ATC 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 FZT1149ATC belongs to Diodes' AEC-Q101-qualified medium-power transistor product line, engineered for high-current switching in harsh-environment power management systems where thermal robustness and gain consistency are essential.
FAQ
What is the maximum continuous collector current for FZT1149ATC?
The FZT1149ATC is rated for -4 A continuous collector current (IC) when mounted on a 52 mm × 52 mm 2 oz copper PCB under still-air conditions. Derating applies above +25°C ambient: power dissipation drops linearly to zero at +150°C junction temperature, per the published derating curve.
Is FZT1149ATC pin-compatible with other SOT223 PNP transistors?
FZT1149ATC uses standard SOT223 pinout (Emitter-Base-Collector-Tab), matching industry convention. However, pin compatibility does not guarantee functional equivalence-base drive requirements, gain profile, and saturation voltage differ significantly across manufacturers and part numbers, requiring circuit-level validation.
Does FZT1149ATC require a heatsink in typical applications?
A dedicated heatsink is not required if PCB layout provides ≥52 mm² of 2 oz copper connected to the collector tab. With that copper area, RθJA = 41.7°C/W allows 3.0 W dissipation at +25°C ambient. For >1.5 W continuous use or elevated ambient temperatures, additional copper or thermal vias are recommended.
What is the significance of the "TC" suffix in FZT1149ATC?
The "TC" suffix denotes tape-and-reel packaging per Diodes Incorporated's internal ordering nomenclature-specifically, 1,000-unit reels on 12 mm tape, compatible with standard SMT pick-and-place equipment. It does not indicate temperature grade or variant functionality; electrical and thermal specs match the base FZT1149A device.
FZT1149ATC 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:
- PNP
- Current - Collector (Ic) (Max):
- 4 A
- Voltage - Collector Emitter Breakdown (Max):
- 25 V
- Vce Saturation (Max) @ Ib, Ic:
- 350mV @ 140mA, 4A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 250 @ 500mA, 2V
- Power - Max:
- 2.5 W
- Frequency - Transition:
- 135MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT1149ATC FAQ
1.How can I place an order for FZT1149ATC through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT1149ATC 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 FZT1149ATC reliable?
The price and inventory of FZT1149ATC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT1149ATC is usually 5 days.
3.What payment methods are accepted for FZT1149ATC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT1149ATC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT1149ATC?
FZT1149ATC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT1149ATC 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 FZT1149ATC?
For technical support, including FZT1149ATC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT1149ATC requirements.
6.How does Aetrix verify that FZT1149ATC is sourced from the original manufacturer or authorized distributors?
All FZT1149ATC 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 FZT1149ATC meets industry standards.
7.What is the process for return or replacement of FZT1149ATC?
All FZT1149ATC units undergo pre-shipment inspection (PSI). If there is an issue with FZT1149ATC, 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 FZT1149ATC part is unused and in its original packaging.
Return procedure for FZT1149ATC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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