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

Diodes Incorporated FZT605TC

Name: FZT605TC
Brand: Diodes Incorporated
SKU: FZT605TC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FZT605TC

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: FZT605TC.pdf

Description:: TRANS NPN DARL 120V 1.5A SOT223

Quantity:: RFQ Add To RFQ list

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Inventory:8,953

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Product details

Overview

FZT605TC from Diodes Incorporated is a 120V NPN Darlington transistor in SOT223 package, designed for high-voltage switching with BV_CEO = 120 V, BVCBO = 140 V, and continuous collector current I_C = 1.5 A. It delivers high DC current gain (h_FE > 2000 at I_C = 1 A) and low saturation voltage (V_CE(sat) ≤ 1.5 V), enabling efficient solenoid, relay, and lamp driving in industrial control systems.

For engineers reviewing the FZT605TC datasheet, FZT605TC pinout, FZT605TC application, or FZT605TC equivalent, key selection criteria include breakdown voltage margin, thermal resistance (R_θJA = 41.7 °C/W on 50 mm × 50 mm 2 oz Cu), pulse current capability (I_CM = 4 A), and RoHS-compliant green packaging.

Technical Context

This Darlington pair integrates two NPN transistors in cascade to achieve high current gain while maintaining single-package simplicity. Its structure enables low base drive requirements (e.g., I_B = 1 mA drives I_C = 1 A) and supports robust switching under inductive loads.

The device operates across –55 °C to +150 °C junction temperature range and features ESD protection (HBM = 4 kV, MM = 400 V). Thermal performance is defined for multiple PCB copper layouts, with R_θJL = 12.9 °C/W confirming efficient heat transfer from junction to lead.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	120 V - Withstands 120 V collector-emitter voltage before breakdown, suitable for 100 V rail switching.
I_C	1.5 A continuous - Supports sustained load currents up to 1.5 A without derating at 25 °C ambient.
h_FE	>2000 @ I_C = 1 A - Enables microcontroller-level base drive (e.g., 1 mA base current switches 1 A load).
V_CE(sat)	≤1.5 V @ I_C = 1 A - Limits conduction loss to ≤1.5 W per switch event, reducing thermal stress.
R_θJA	41.7 °C/W - Requires ≥50 mm × 50 mm 2 oz Cu pad for full 3.0 W power dissipation at T_A = 25 °C.
f_T	150 MHz - Supports fast switching transitions (sub-microsecond turn-on/off) in PWM-driven loads.
ESD HBM	4000 V - Provides robust handling tolerance during assembly and board-level integration.

Pinout & Package

Package: SOT223 (Type DN), surface-mount, 4-terminal configuration with emitter-collector-base-heat sink layout. Molded plastic body with matte tin-plated leads, UL 94V-0 rated, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter connection of Darlington pair	Low-impedance return path; electrically tied to tab/heat sink in standard mounting.
2 (Collector)	Collector connection of Darlington pair	Main high-current output node; thermally coupled to tab for enhanced heat dissipation.
3 (Base)	Input control terminal	Drives first transistor's base; requires current-limiting resistor to prevent overdrive.
4 (Tab / Heat Sink)	Collector-integrated thermal pad	Internally connected to collector; must be soldered to PCB copper pour for thermal management.

Key Features

Feature	Design Value
High-voltage isolation	BV_CBO = 140 V ensures safe operation in 120 V AC-derived DC rails with margin.
Automotive-grade readiness	Manufactured in IATF 16949-certified facilities; PPAP-capable for qualified AEC-Q101 applications.
Green packaging	Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets global environmental mandates.
Pulse current resilience	I_CM = 4 A supports short-duration inrush currents in relay/solenoid coil energization.

Applications

Industrial Relay Drivers

Automotive Lamp Control

Use Scenario: Driving 24 V DC industrial relays with 500–1000 Ω coils in PLC output modules.

IC Role / Device Role / Timing Role: High-gain Darlington switch providing galvanic isolation and low base drive burden.

Use Value: Eliminates need for external driver stages; reduces BOM count and PCB area while sustaining 1.5 A hold current.

Use Scenario: Controlling headlamp, fog lamp, or interior lighting circuits in 12 V/24 V automotive systems.

IC Role / Device Role / Timing Role: Load-switching transistor managing resistive and inductive lamp loads with flyback suppression.

Use Value: Withstands load dump transients up to 120 V; integrated thermal pad maintains reliability under sustained 1 A illumination duty cycles.

Solenoid Actuation

Power Supply Sequencing

Use Scenario: Energizing 12–24 V DC solenoids in HVAC dampers, fluid valves, and industrial automation actuators.

IC Role / Device Role / Timing Role: High-current switch delivering 1.5 A peak coil current with controlled turn-on/turn-off timing.

Use Value: Fast switching (t_on = 0.5 µs, t_off = 1.6 µs) minimizes coil dwell time and improves system response latency.

Use Scenario: Enabling/disabling auxiliary power rails in multi-rail embedded systems with sequencing logic.

IC Role / Device Role / Timing Role: Voltage-controlled pass element used in discrete OR-ing or enable-path circuitry.

Use Value: Low V_CE(sat) ensures minimal voltage drop (<1.5 V) across the switch, preserving downstream rail accuracy and efficiency.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage Darlington switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NSS12601CF8T1G	Lower V_CEO (100 V), smaller SOT-23 package, lower I_C (0.6 A)	Not suitable for 120 V bus applications; limited to ≤100 V DC loads	Select only when space-constrained and voltage requirement ≤100 V.
STMicroelectronics BUW12A	TO-126 package, higher P_D (15 W), same V_CEO (120 V), but no RoHS/green compliance	Requires through-hole assembly; unsuitable for automated SMT lines	Choose for legacy designs needing higher power dissipation and accepting non-RoHS constraints.

Compared with NSS12601CF8T1G and BUW12A, FZT605TC uniquely balances SMT compatibility, 120 V rating, 1.5 A current, RoHS/green compliance, and thermal performance in SOT223-making it optimal for new industrial and automotive control designs requiring surface-mount scalability and regulatory alignment.

Availability

FZT605TC is available at Aetrix Electronics and suitable for industrial relay drivers, automotive lamp control, and solenoid actuation requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for FZT605TC 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.

FZT605TC belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for ruggedized switching in industrial controls, automotive body electronics, and power interface applications where reliability under voltage stress and thermal cycling is critical.

FAQ

What is the maximum allowable junction temperature for FZT605TC?

The absolute maximum junction temperature (T_J) is +150 °C, and the storage temperature range matches this limit. Operation above this threshold risks permanent degradation of h_FE, increased leakage, and bond wire failure. Derating begins at +25 °C ambient per Figure 5, requiring reduced power dissipation as ambient rises.

Is FZT605TC pin-compatible with other SOT223 Darlington transistors?

No universal pin compatibility exists across SOT223 Darlingtons due to varying internal configurations (e.g., emitter-base-collector vs. collector-emitter-base assignments). FZT605TC uses emitter-collector-base-tab pinout; substitution requires verification of both pin mapping and electrical parameters-not just package outline.

Does FZT605TC require a heatsink in typical applications?

A dedicated external heatsink is not required, but the collector-connected tab must be soldered to ≥50 mm × 50 mm of 2 oz copper for full 3.0 W power dissipation. Smaller pads reduce safe operating power-e.g., 25 mm × 25 mm 1 oz Cu limits P_D to 1.6 W per Note 7.

Can FZT605TC be used in linear amplifier configurations?

It is not optimized for linear amplification due to inherent Darlington nonlinearity, wide h_FE variation (2k–100k), and thermal runaway risk under bias. Its datasheet specifies only switching parameters (V_CE(sat), t_on/t_off, SOA); no small-signal gain or distortion data is provided.

FZT605TC 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 - Darlington

Current - Collector (Ic) (Max):: 1.5 A

Voltage - Collector Emitter Breakdown (Max):: 120 V

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 1mA, 1A

Current - Collector Cutoff (Max):: 10µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 2000 @ 1A, 5V

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

FZT605TC FAQ

1.How can I place an order for FZT605TC through Aetrix?

Please submit a Request for Quotation (RFQ) for FZT605TC 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 FZT605TC reliable?

The price and inventory of FZT605TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT605TC is usually 5 days.

3.What payment methods are accepted for FZT605TC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT605TC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FZT605TC?

FZT605TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FZT605TC 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 FZT605TC?

For technical support, including FZT605TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT605TC requirements.

6.How does Aetrix verify that FZT605TC is sourced from the original manufacturer or authorized distributors?

All FZT605TC 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 FZT605TC meets industry standards.

7.What is the process for return or replacement of FZT605TC?

All FZT605TC units undergo pre-shipment inspection (PSI). If there is an issue with FZT605TC, 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 FZT605TC part is unused and in its original packaging.

Return procedure for FZT605TC:

1.Submit a request within 90 days.

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

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