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

onsemi SPZT651T1G

Name: SPZT651T1G
Brand: onsemi
SKU: SPZT651T1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SPZT651T1G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: SPZT651T1G.pdf

Description:: TRANS NPN 60V 2A SOT223

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SPZT651T1G from onsemi is an NPN silicon epitaxial transistor in SOT-223 package, rated for 60 V_CEO, 2.0 A_C, and 0.8 W at T_A = 25°C, with h_FE ≥75 at I_C = 50 mA and V_CE = 2.0 V, used in medium-power industrial switching and consumer power regulation circuits.

For engineers reviewing the SPZT651T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 60 V breakdown voltage, 2.0 A continuous collector current capability, SOT-223 thermal performance (R_JA = 156°C/W), and AEC-Q101 qualification for automotive-grade reliability assurance.

Technical Context

This device operates as a medium-power general-purpose NPN bipolar junction transistor optimized for surface-mount switching and linear amplification. Its SOT-223 package integrates a thermally enhanced leadframe with collector terminals on pins 2 and 4, enabling efficient heat dissipation in compact PCB layouts.

The transistor exhibits DC current gain (h_FE) of ≥75 at low-to-moderate currents (50–500 mA) and maintains usable gain (≥40) up to 2.0 A, with V_CE(sat) ≤0.5 V at I_C = 2.0 A / I_B = 200 mA, supporting efficient saturated-switching operation in DC-DC converters and motor drivers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - Maximum collector-emitter voltage before breakdown under open-base conditions; defines safe operating range in switching applications.
I_C	2.0 A - Continuous collector current rating; supports medium-power load switching without forced cooling.
P_D @ 25°C	0.8 W - Total power dissipation limit at ambient temperature; requires thermal design consideration above 25°C (derating: 6.4 mW/°C).
h_FE @ I_C=1.0 A	≥75 - Minimum DC current gain at 1 A collector current; ensures reliable base drive sizing in high-current switch designs.
V_CE(sat)	≤0.5 V @ I_C=2.0 A/I_B=200 mA - Low saturation voltage reduces conduction losses in power control stages.
f_T	75 MHz - Transition frequency; supports stable operation in audio-frequency amplifiers and PWM control feedback paths.

Pinout & Package

SOT-223 (Case 318E-04) is a surface-mount, thermally enhanced plastic package with four leads: pins 2 and 4 are internally connected to the collector, pin 1 is base, and pin 3 is emitter. The exposed collector tab improves thermal conduction to the PCB copper pour.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Base	Control input terminal; requires current-limited drive (e.g., 100–200 mA) to achieve full saturation at 2.0 A collector load.
Pins 2 & 4	Collector (common)	High-current output node; electrically tied internally; soldered to large copper area for thermal management.
Pin 3	Emitter	Current return path; typically grounded or connected to load return; forms the reference for base-emitter biasing.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including engine control modules and body electronics requiring extended temperature and reliability compliance.
SOT-223 thermal performance	R_JA = 156°C/W enables 0.8 W dissipation with <125°C junction rise over ambient on standard FR-4 board.
High-current saturation	V_CE(sat) ≤0.5 V at I_C/I_B = 10 ensures <1 W conduction loss at 2.0 A, improving efficiency in 12 V/24 V power switches.
Pb-free, RoHS-compliant	Meets global environmental regulations; compatible with lead-free reflow and wave soldering processes per JEDEC J-STD-020.

Applications

Automotive Body Control Module	Industrial DC Motor Driver
Use Scenario: Switching 12 V solenoids and relays in door lock, window lift, and lighting control units. IC Role / Device Role / Timing Role: Medium-power NPN switch controlling inductive loads with flyback protection. Use Value: 60 V V_CEO withstands load-dump transients; 2.0 A rating supports dual-solenoid actuation without parallel devices.	Use Scenario: H-bridge low-side switching in 24 V brushed DC motor controllers for HVAC actuators and conveyor systems. IC Role / Device Role / Timing Role: High-current saturated switch delivering bidirectional current to motor windings. Use Value: V_CE(sat) ≤0.5 V minimizes I²R losses at 1.5–2.0 A; SOT-223 footprint allows dense layout with thermal relief.
Consumer Power Supply Regulation	LED Constant-Current Driver
Use Scenario: Linear pass transistor in adjustable 5–24 V bench power supplies and USB-C PD adapter auxiliary rails. IC Role / Device Role / Timing Role: Series-pass element regulating output voltage via base bias control. Use Value: h_FE ≥75 at 500 mA ensures stable loop gain; 150°C T_J rating supports sustained operation under load.	Use Scenario: Constant-current sink for high-brightness LED strings in signage and architectural lighting. IC Role / Device Role / Timing Role: Current-regulating switch in analog dimming circuits with sense-resistor feedback. Use Value: Tight V_BE(on) tolerance (≤1.0 V) enables accurate current setting; 2.0 A capacity supports multi-string configurations.

Automotive Body Control Module

Industrial DC Motor Driver

Use Scenario: Switching 12 V solenoids and relays in door lock, window lift, and lighting control units.

IC Role / Device Role / Timing Role: Medium-power NPN switch controlling inductive loads with flyback protection.

Use Value: 60 V V_CEO withstands load-dump transients; 2.0 A rating supports dual-solenoid actuation without parallel devices.

Use Scenario: H-bridge low-side switching in 24 V brushed DC motor controllers for HVAC actuators and conveyor systems.

IC Role / Device Role / Timing Role: High-current saturated switch delivering bidirectional current to motor windings.

Use Value: V_CE(sat) ≤0.5 V minimizes I²R losses at 1.5–2.0 A; SOT-223 footprint allows dense layout with thermal relief.

Consumer Power Supply Regulation

LED Constant-Current Driver

Use Scenario: Linear pass transistor in adjustable 5–24 V bench power supplies and USB-C PD adapter auxiliary rails.

IC Role / Device Role / Timing Role: Series-pass element regulating output voltage via base bias control.

Use Value: h_FE ≥75 at 500 mA ensures stable loop gain; 150°C T_J rating supports sustained operation under load.

Use Scenario: Constant-current sink for high-brightness LED strings in signage and architectural lighting.

IC Role / Device Role / Timing Role: Current-regulating switch in analog dimming circuits with sense-resistor feedback.

Use Value: Tight V_BE(on) tolerance (≤1.0 V) enables accurate current setting; 2.0 A capacity supports multi-string configurations.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD122G	Higher V_CEO (100 V), lower h_FE (20–70), TO-252 package with higher R_JA (62.5°C/W)	Better suited for 48 V industrial systems; less suitable for space-constrained SMT layouts	Select when higher voltage margin is required and thermal budget allows larger footprint
MMBT4401LT1G	Lower I_C (600 mA), smaller SOT-23 package, f_T = 250 MHz	Optimized for signal amplification and low-power switching; not rated for 2 A loads	Choose only for sub-500 mA applications where high-speed response outweighs current capacity

Compared with SPZT651T1G, MJD122G offers greater voltage headroom but demands more PCB area and thermal design effort, while MMBT4401LT1G sacrifices current capability for speed and size-making SPZT651T1G the optimal balance of 2 A current, 60 V rating, and SOT-223 thermal efficiency in medium-power SMT designs.

Availability

SPZT651T1G is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor control, and consumer power supply applications requiring stable component supply, AEC-Q101 compliance, and medium-power SMT transistor performance.

Supply support for SPZT651T1G 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

onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The PZT651 family delivers robust, AEC-Q101-qualified NPN transistors in SOT-223 for medium-power switching in harsh-environment applications where reliability, thermal performance, and Pb-free compliance are critical.

FAQ

What is the maximum collector current rating for SPZT651T1G?

The SPZT651T1G is rated for a continuous collector current (I_C) of 2.0 A at T_A = 25°C. Derating applies above 25°C at 6.4 mW/°C. This rating assumes proper PCB thermal design using the SOT-223 package's exposed collector pad. The SPZT651T1G maintains usable h_FE down to 40 at this full 2.0 A load, confirming its suitability for sustained high-current switching.

Is SPZT651T1G qualified for automotive applications?

Yes, SPZT651T1G is AEC-Q101 qualified and PPAP capable. The "S" prefix in SPZT651T1G explicitly denotes automotive-grade manufacturing controls, site-specific traceability, and stress testing per AEC-Q101 standards. It is specified for operation from −65°C to +150°C junction temperature and supports automotive body control, lighting, and power distribution modules requiring long-term reliability.

What is the pin configuration of SPZT651T1G in the SOT-223 package?

The SPZT651T1G uses a 4-pin SOT-223 package with collector terminals on pins 2 and 4 (internally connected), base on pin 1, and emitter on pin 3. The exposed metal tab is electrically connected to the collector. This dual-collector configuration enhances thermal conduction and current handling-critical for maintaining safe junction temperatures during 2.0 A operation.

Does SPZT651T1G have a complementary PNP transistor?

Yes, the PNP complement to SPZT651T1G is SPZT751T1G, also in SOT-223 package and AEC-Q101 qualified. Both share matched voltage ratings (V_CEO = 60 V), current capability (2.0 A), and thermal characteristics. This pairing enables balanced push-pull or H-bridge topologies in automotive and industrial motor control where complementary switching behavior is required.

What is the typical DC current gain (h_FE) of SPZT651T1G at different collector currents?

The SPZT651T1G specifies h_FE ≥75 at I_C = 50 mA, 500 mA, and 1.0 A (all at V_CE = 2.0 V), and ≥40 at I_C = 2.0 A. This flat gain profile across three decades of current ensures predictable base drive requirements in both small-signal and high-current switching applications, simplifying design of driver stages for the SPZT651T1G.

SPZT651T1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 2 A

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 200mA, 2A

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 75 @ 1A, 2V

Power - Max:: 800 mW

Frequency - Transition:: 75MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223 (TO-261)

SPZT651T1G FAQ

1.How can I place an order for SPZT651T1G through Aetrix?

Please submit a Request for Quotation (RFQ) for SPZT651T1G 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 SPZT651T1G reliable?

The price and inventory of SPZT651T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SPZT651T1G is usually 5 days.

3.What payment methods are accepted for SPZT651T1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SPZT651T1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SPZT651T1G?

SPZT651T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SPZT651T1G 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 SPZT651T1G?

For technical support, including SPZT651T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SPZT651T1G requirements.

6.How does Aetrix verify that SPZT651T1G is sourced from the original manufacturer or authorized distributors?

All SPZT651T1G 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 SPZT651T1G meets industry standards.

7.What is the process for return or replacement of SPZT651T1G?

All SPZT651T1G units undergo pre-shipment inspection (PSI). If there is an issue with SPZT651T1G, 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 SPZT651T1G part is unused and in its original packaging.

Return procedure for SPZT651T1G:

1.Submit a request within 90 days.

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

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