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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Diodes Incorporated FZT1051ATC

Name: FZT1051ATC
Brand: Diodes Incorporated
SKU: FZT1051ATC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FZT1051ATC

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-261-4, TO-261AA

Datasheet:: FZT1051ATC.pdf

Description:: TRANS NPN 40V 5A SOT-223-3

Quantity:: RFQ Add To RFQ list

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Inventory:9,186

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Product details

Overview

FZT1051ATC from Diodes Incorporated is a 40V NPN medium-power transistor in SOT223 package, rated for 5A continuous collector current and 20A peak pulse current, with V_CE(sat) < 120mV at 1A and h_FE ≥ 130 at 5A - used as a high-current switch in solenoid, relay, and motor control circuits.

For engineers reviewing the FZT1051ATC datasheet, FZT1051ATC pinout, FZT1051ATC application, or FZT1051ATC equivalent, key selection criteria include low saturation voltage (≤120mV @ 1A), high gain retention up to 10A, 40V V_CEO rating, SOT223 thermal performance (R_θJA = 41.7°C/W on 52mm × 52mm 2oz Cu), and AEC-Q101 readiness for automotive-grade designs.

Technical Context

This NPN bipolar junction transistor operates as a saturated switch in medium-power DC applications, supporting fast switching (t_on ≤ 220ns, t_off ≤ 540ns) with f_T = 155MHz and C_obo = 27–40pF. Its design emphasizes low on-resistance (R_SAT = 50mΩ @ 5A) and stable gain across wide current range (h_FE = 40–440).

Thermal management is enabled by the SOT223 (Type DN) package's low R_θJL = 10.9°C/W and defined mounting conditions: R_θJA varies from 41.7°C/W (52mm × 52mm 2oz Cu) to 104°C/W (minimum pad layout), requiring PCB copper area optimization for sustained 5A operation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage under operating conditions; defines upper rail limit for DC switching circuits.
I_C (continuous)	5 A - Sustained collector current capability; enables direct drive of 5A solenoids or small DC motors without external heatsinking under defined PCB layout.
V_CE(sat) @ 1A	< 120 mV - Low conduction loss at moderate load; reduces power dissipation to <120mW per switch event.
h_FE @ 5A	130–220 - Confirmed current gain at full rated current; ensures reliable base drive sizing for saturation across production lot variation.
R_θJA (max)	104 °C/W - Thermal resistance with minimal pad layout; sets worst-case junction temperature rise (ΔT_J = 520°C at 5A) unless enhanced copper is used.
f_T	155 MHz - Current gain-bandwidth product; supports switching frequencies up to ~10–20MHz in optimized layouts with low parasitic inductance.
ESD HBM	4,000 V - Robustness against human-body model discharge; reduces need for external ESD protection in board-level handling and assembly.

Pinout & Package

Package: SOT223 (Type DN), surface-mount, 4-pin configuration with collector-connected tab for thermal and electrical connection. Molded green compound (UL 94V-0), matte tin-plated leads, 0.112g weight.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitting terminal for majority carriers	Reference node for base drive; connects to ground or low-side return path in common-emitter switches.
2 (Base)	Control input for minority carrier injection	Receives current-limited drive (IB ≤ 1A max); requires series resistor to ensure saturation at target I_C.
3 (Collector)	Current output terminal	High-current output node; electrically and thermally tied to exposed metal tab - must be connected to large copper pour or heatsink.
Tab (Collector)	Primary collector connection & thermal path	Provides lowest-inductance, lowest-resistance collector path and dominant heat conduction route to PCB; soldered directly to copper.

Key Features

Feature	Design Value
Low V_CE(sat) at 1A	≤120 mV - Enables <120mW conduction loss per switch, critical for thermally constrained 5A DC modules.
High h_FE hold-up to 10A	h_FE ≥ 40 @ 10A - Ensures predictable base drive requirements even during transient overloads, simplifying driver design.
Low R_SAT @ 5A	50 mΩ - Equivalent on-resistance comparable to discrete MOSFETs; reduces I²R heating under continuous 5A load.
SOT223 thermal performance	R_θJL = 10.9°C/W - Direct junction-to-lead path enables efficient heat transfer to PCB copper, supporting >2W dissipation with proper layout.
AEC-Q101 readiness	PPAP-capable, IATF 16949 manufacturing - Meets baseline automotive qualification requirements; suitable for non-safety-critical vehicle subsystems.

Applications

Solenoid Driver

Relay Interface

Use Scenario: Driving 24V/3A industrial solenoids in pneumatic valve control systems.

IC Role / Device Role / Timing Role: High-current saturated switch enabling fast actuation (<5ms response) with minimal self-heating.

Use Value: V_CE(sat) ≤120mV limits power loss to <360mW, eliminating need for heatsinks in compact DIN-rail mounted controllers.

Use Scenario: Controlling 12V/5A SPDT relays in battery management system (BMS) contactor sequencing.

IC Role / Device Role / Timing Role: Low-latency, high-reliability switch ensuring precise timing between precharge and main contactor closure.

Use Value: 220ns turn-on and 540ns turn-off times support sub-millisecond sequencing; h_FE stability at 5A guarantees consistent drive margin across temperature.

DC Motor Control

Actuator Power Stage

Use Scenario: H-bridge low-side switch for 24V/4A brushed DC motors in automated gate openers.

IC Role / Device Role / Timing Role: Continuous conduction mode (CCM) switch handling bidirectional current during PWM commutation.

Use Value: R_SAT = 50mΩ minimizes conduction loss during 100% duty cycle stall conditions, preventing thermal runaway.

Use Scenario: Linear actuator current amplifier in HVAC damper positioners requiring 0–5A analog-controlled output.

IC Role / Device Role / Timing Role: Linear-mode current source with gain-stabilized h_FE up to 5A for precision analog feedback loops.

Use Value: h_FE = 130–220 @ 5A enables accurate current mirroring without dynamic gain compensation circuitry.

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
ZXTN2012E6TA	V_CEO = 60V, I_C = 4A, V_CE(sat) = 150mV @ 2A, SOT23 package	Lower current rating and higher saturation voltage; limited thermal mass vs. SOT223	Prefer for space-constrained 2–3A logic-level switching where footprint matters more than thermal headroom.
MJD122G	V_CEO = 100V, I_C = 8A, V_CE(sat) = 1.5V @ 3A, TO-220 package	Higher V_CEO, higher V_CE(sat), requires heatsink; larger footprint and leaded	Choose when 100V breakdown or >5A surge tolerance is required, and board space allows TO-220 mounting.

Compared with ZXTN2012E6TA and MJD122G, FZT1051ATC delivers optimal balance of 5A continuous current, ultra-low 120mV saturation, and SOT223 thermal efficiency - making it preferred for compact, thermally demanding 24–40V DC power stages where leadless mounting and PCB-integrated heatsinking are essential.

Availability

FZT1051ATC is available at Aetrix Electronics and suitable for solenoid drivers, relay interfaces, and motor controls requiring stable component supply, automotive-grade traceability, and RoHS-compliant "Green" packaging.

Supply support for FZT1051ATC 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 North America.

FZT1051ATC belongs to Diodes' FZT series of medium-power transistors engineered for high-current switching in industrial automation, automotive body electronics, and power conversion - emphasizing low saturation, gain stability, and robust thermal performance in surface-mount packages.

FAQ

What is the maximum continuous collector current for FZT1051ATC, and under what conditions is it specified?

The FZT1051ATC is rated for 5A continuous collector current (I_C) at T_A = +25°C with the collector lead mounted on a 52mm × 52mm 2oz copper area on FR4 PCB under still-air conditions. Derating applies above +25°C ambient per the datasheet's thermal curves.

Does FZT1051ATC meet automotive qualification standards?

FZT1051ATC is manufactured in IATF 16949-certified facilities and is PPAP-capable. While not pre-qualified to AEC-Q101 in this specific marking, Diodes offers AEC-Q101-qualified versions (e.g., FZT1051MTA) - customers requiring formal automotive qualification should consult Diodes' automotive product line or local representative.

How does the SOT223 package's thermal performance compare between different PCB copper layouts?

R_θJA ranges from 41.7°C/W (52mm × 52mm 2oz Cu) to 104°C/W (minimum recommended pad layout). Using the full 52mm × 52mm copper area reduces junction-to-ambient temperature rise by ~60% at 5A, enabling reliable operation without external heatsinking in most industrial environments.

Can FZT1051ATC replace a MOSFET in low-voltage switching applications?

Yes - its 50mΩ effective on-resistance at 5A and low 120mV V_CE(sat) provide MOSFET-like conduction efficiency. However, it requires base current drive (not voltage-gated), so gate-driver ICs cannot be reused; base resistors must be sized for h_FE-dependent current gain.

FZT1051ATC 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):: 5 A

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 340mV @ 100mA, 5A

Current - Collector Cutoff (Max):: 10nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 270 @ 1A, 2V

Power - Max:: 2.5 W

Frequency - Transition:: 155MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223-3

FZT1051ATC FAQ

1.How can I place an order for FZT1051ATC through Aetrix?

Please submit a Request for Quotation (RFQ) for FZT1051ATC 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 FZT1051ATC reliable?

The price and inventory of FZT1051ATC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT1051ATC is usually 5 days.

3.What payment methods are accepted for FZT1051ATC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT1051ATC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FZT1051ATC?

FZT1051ATC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FZT1051ATC 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 FZT1051ATC?

For technical support, including FZT1051ATC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT1051ATC requirements.

6.How does Aetrix verify that FZT1051ATC is sourced from the original manufacturer or authorized distributors?

All FZT1051ATC 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 FZT1051ATC meets industry standards.

7.What is the process for return or replacement of FZT1051ATC?

All FZT1051ATC units undergo pre-shipment inspection (PSI). If there is an issue with FZT1051ATC, 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 FZT1051ATC part is unused and in its original packaging.

Return procedure for FZT1051ATC:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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