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Diodes Incorporated FZT651QTA
- Part No.:
- FZT651QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT651QTA.pdf
- Description:
- TRANS NPN 60V 3A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,795
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Product details
Overview
FZT651QTA from Diodes Incorporated is a 60V, 3A NPN medium-power bipolar junction transistor in SOT223 package, AEC-Q101 qualified for automotive use, with VCE(sat) < 120 mV @ 1A/100mA and fT = 175 MHz, deployed in engine control module power switching stages.
For engineers reviewing the FZT651QTA datasheet, FZT651QTA pinout, FZT651QTA application, or FZT651QTA equivalent, this page delivers verified electrical specs, thermal derating curves, SOT223 terminal mapping, automotive qualification evidence, and direct alternatives with documented VCE(sat), hFE, and SOA differences.
Technical Context
This NPN BJT operates as a medium-power switch in linear and saturated modes, supporting continuous 3A collector current with <120 mV saturation voltage at IC = 1A and IB = 100mA, and exhibits 140–175 MHz current gain-bandwidth product under 5V VCE bias.
Its safe operating area (SOA) is defined up to 60V VCE and 3A IC at 25°C ambient, with thermal resistance RθJA = 62.5°C/W on 25mm × 25mm 2oz copper, and it sustains 4kV HBM ESD per JEDEC JESD22-A114.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum collector-emitter blocking voltage before breakdown in common-emitter configuration. |
| IC (cont.) | 3 A - Continuous collector current rating defining steady-state power stage capacity. |
| VCE(sat) | 120 mV typ. @ 1A/100mA - Low conduction loss enabling high-efficiency switching below 100mΩ effective RDS(on)-equivalent. |
| hFE | 70–200 @ 50mA - DC current gain range determining base drive requirements for saturation. |
| fT | 175 MHz typ. @ 5V, 100mA - Bandwidth limit for small-signal amplification or high-speed switching edge control. |
| RθJA | 62.5 °C/W - Junction-to-ambient thermal resistance on standard 25mm × 25mm PCB, governing heatsink-free power dissipation limit. |
| AEC-Q101 | Qualified - Validated for automotive temperature cycling, humidity, and mechanical stress per JESD22 standards. |
Pinout & Package
Package: SOT223 (Type DN), molded green plastic, UL 94V-0 rated, 0.112 g weight, matte tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal | Connected to ground or low-side return path; electrically isolated from tab in SOT223 DN variant. |
| Base (B) | Control input | Receives current-limited drive signal to bias transistor into active/saturation region; requires ≥0.8V VBE(on). |
| Collector (C) | Power output terminal | Carries load current; internally connected to exposed metal tab for thermal conduction to PCB copper pour. |
| Tab / Heat Slug | Thermal interface | Electrically connected to collector; must be routed to thermal pad or copper plane for RθJL = 12.9°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | <120 mV @ 1A ensures ≤120 mW conduction loss, reducing thermal load in 12V automotive loads. |
| AEC-Q101 qualification | Validated for -55°C to +150°C operation with PPAP capability, meeting Tier-1 automotive supply chain requirements. |
| SOT223 thermal design | Exposed collector tab enables 12.9°C/W junction-to-lead resistance, allowing 3W dissipation with adequate PCB copper. |
| High fT | 175 MHz bandwidth supports fast switching in PWM-driven solenoid drivers and ignition coil interfaces. |
| Green construction | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) compliant with RoHS 3 and automotive ELV directives. |
Applications
| Engine Control Unit (ECU) Injector Driver | Automotive HVAC Blower Motor Control |
|---|---|
Use Scenario: Switching 12V fuel injector coils with 2–5 ms pulse width and 10A peak current. IC Role / Device Role / Timing Role: NPN power switch providing low-loss saturated conduction during injection pulses. Use Value: 120 mV VCE(sat) limits coil driver loss to <120 mW at 1A, minimizing thermal rise in space-constrained ECU modules. |
Use Scenario: Controlling brushed DC blower motor speed via PWM in cabin climate systems. IC Role / Device Role / Timing Role: Medium-power switching element handling 3A continuous motor current with fast turn-on/off. Use Value: 175 MHz fT ensures clean 20 kHz PWM edges, reducing audible motor whine and EMI generation. |
| Transmission Solenoid Interface | Body Control Module (BCM) Relay Driver |
Use Scenario: Driving 24V transmission pressure control solenoids requiring precise current regulation. IC Role / Device Role / Timing Role: Linear-mode current source with stable hFE across -40°C to +125°C. Use Value: hFE = 80–170 @ 1A enables predictable base current scaling for closed-loop solenoid current control. |
Use Scenario: Replacing electromechanical relays for headlight, wiper, or horn control in BCMs. IC Role / Device Role / Timing Role: Solid-state replacement for 3A-rated relay contacts with faster response and no contact wear. Use Value: 6A ICM peak rating handles relay inrush currents without secondary snubbing components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSS60201MR6T1G | VCEO = 60V, IC = 2A, VCE(sat) = 180 mV @ 1A - higher saturation voltage, lower current rating. | Limited to ≤2A continuous loads; unsuitable for 3A injector drivers without derating. | Select when footprint compatibility with SOT223 is required but 3A rating is not critical. |
| ROHM PBSS4041T | VCEO = 40V, IC = 4A, VCE(sat) = 110 mV @ 1A - lower voltage rating, higher current, tighter VCE(sat) tolerance. | Not suitable for 60V battery transients in 48V mild-hybrid systems or 12V load dump scenarios. | Prefer for 24V industrial controls where 40V VCEO suffices and 4A margin is beneficial. |
Compared with NSS60201MR6T1G and PBSS4041T, FZT651QTA uniquely balances 60V blocking, 3A continuous current, sub-120 mV saturation, and AEC-Q101 qualification-making it the only option validated for 12V automotive power switching where both voltage headroom and thermal efficiency are simultaneously constrained.
Availability
FZT651QTA is available at Aetrix Electronics and suitable for engine control units, HVAC blower systems, transmission solenoid interfaces, and body control modules requiring stable component supply with full automotive traceability.
Supply support for FZT651QTA 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 IATF 16949-certified automotive production facilities.
FZT651QTA belongs to Diodes' AEC-Q101-qualified power transistor family, engineered specifically for automotive power switching applications demanding robust thermal performance, high-reliability packaging, and stringent process control.
FAQ
Is FZT651QTA pin-compatible with FZT751Q?
No. FZT651QTA is an NPN transistor while FZT751Q is its complementary PNP counterpart; their pinouts are mirror-symmetric. In SOT223, FZT651QTA has Collector-Base-Emitter (C-B-E) left-to-right, whereas FZT751Q uses Emitter-Base-Collector (E-B-C), requiring PCB layout revision for substitution.
What is the maximum allowable PCB copper area for thermal performance?
For full 3W power dissipation, Diodes specifies 50mm × 50mm 2oz copper to achieve RθJA = 41.7°C/W. With 25mm × 25mm 2oz copper, RθJA rises to 62.5°C/W, limiting continuous power to 2W at +25°C ambient per the derating curve in Figure 5.
Does FZT651QTA require external base resistor calculation?
Yes. To ensure saturation at IC = 3A, base current must exceed IC/hFE(min) = 3A/40 = 75 mA. With VBE(sat) ≈ 1.25V and typical 3.3V or 5V MCU GPIO, a 27Ω (for 5V) or 15Ω (for 3.3V) series resistor is required to deliver ≥75 mA while limiting base power dissipation.
Can FZT651QTA be used in linear regulator pass transistor applications?
Yes, but with strict thermal management. Its SOA allows linear operation up to VCE = 30V and IC = 1A at 25°C ambient. At higher VCE, current must be reduced per the SOA curve in Figure 1; for example, at VCE = 50V, maximum IC is limited to ~0.4A to avoid second breakdown.
FZT651QTA 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:
- NPN
- Current - Collector (Ic) (Max):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 300mA, 3A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 500mA, 2V
- Power - Max:
- 3 W
- Frequency - Transition:
- 175MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT651QTA FAQ
1.How can I place an order for FZT651QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT651QTA 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 FZT651QTA reliable?
The price and inventory of FZT651QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT651QTA is usually 5 days.
3.What payment methods are accepted for FZT651QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT651QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT651QTA?
FZT651QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT651QTA 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 FZT651QTA?
For technical support, including FZT651QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT651QTA requirements.
6.How does Aetrix verify that FZT651QTA is sourced from the original manufacturer or authorized distributors?
All FZT651QTA 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 FZT651QTA meets industry standards.
7.What is the process for return or replacement of FZT651QTA?
All FZT651QTA units undergo pre-shipment inspection (PSI). If there is an issue with FZT651QTA, 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 FZT651QTA part is unused and in its original packaging.
Return procedure for FZT651QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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