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

onsemi MMJT350T1G

Name: MMJT350T1G
Brand: onsemi
SKU: MMJT350T1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMJT350T1G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MMJT350T1G.pdf

Description:: TRANS PNP 300V 0.5A SOT223

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MMJT350T1G from onsemi is a PNP silicon bipolar power transistor designed for line-operated series pass and switching regulators, featuring 300 V_CEO, 0.5 A continuous collector current, 2.75 W power dissipation at T_C = 25°C, and SOT-223 package with UL 94 V-0 epoxy. It serves as a high-voltage PNP switch or pass element in low-power AC/DC converters.

For engineers reviewing the MMJT350T1G datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO rating, DC current gain (h_FE = 30–240), thermal resistance (R_JC = 45°C/W), safe operating area limits, and AEC-Q101 qualification status for automotive-grade reliability.

Technical Context

This device operates as a medium-power PNP bipolar junction transistor optimized for linear regulation and hard-switching applications where high V_CEO and robust second-breakdown immunity are required. Its h_FE is specified at two bias points (IC = 50 mA and 100 mA), supporting stable gain across load ranges.

The SOT-223 package provides enhanced thermal performance via a large copper tab connected to the collector terminal, enabling 2.75 W dissipation at T_C = 25°C and R_JA = 85°C/W on 1"² FR-4 board. ESD rating meets HBM Class 3B (≥8 kV).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	300 Vdc - supports direct connection to 230 VAC rectified rails without external snubbing in series-pass topologies
I_C (cont.)	0.5 A - enables regulation of up to ~1.2 W output in linear mode with 2.4 V dropout at full load
P_D @ T_C=25°C	2.75 W - achievable only with heatsinking via collector pad; derates 22 mW/°C above 25°C
h_FE	30–240 - wide gain range allows flexible base drive design; minimum 30 at IC = 50 mA ensures reliable saturation under worst-case conditions
R_JC	45°C/W - enables efficient heat transfer from junction to case, critical for sustained operation near thermal limits
T_J Range	–55°C to +150°C - qualified for extended industrial and automotive under-hood environments

Pinout & Package

SOT-223 (Case 318E, Style 1) package with exposed collector tab for thermal conduction and mechanical mounting. Pin 1 = Base, Pin 2 = Collector (tab), Pin 3 = Emitter, Pin 4 = Collector (second connection). The collector is internally bonded to both pins 2 and 4 for low-inductance, high-current path routing.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Base)	Control input	Receives base current to turn on transistor; requires current-limiting resistor to ensure I_B ≤ I_C/10 for saturation
Pin 2 (Collector)	Main power terminal	Primary collector connection tied to internal die; electrically and thermally coupled to metal tab
Pin 3 (Emitter)	Output reference node	Connected to regulated output or ground return; voltage drop determines emitter-follower offset
Pin 4 (Collector)	Redundant collector	Second collector bond wire improves current sharing and reduces parasitic inductance in switching applications

Key Features

Feature	Design Value
High V_CEO (300 V)	Enables use in 230 VAC-derived supplies without cascading transistors or voltage clamping networks
UL 94 V-0 epoxy	Meets flammability safety requirements for enclosed industrial and consumer power supplies
AEC-Q101 qualified	Validated for automotive temperature cycling, humidity, and mechanical stress per JESD22 standards
Low R_JC (45°C/W)	Supports higher ambient temperatures in compact enclosures by minimizing junction-to-case thermal bottleneck
Pb-free, RoHS compliant	Compatible with lead-free reflow profiles (peak 260°C) and meets global environmental compliance mandates

Applications

AC/DC Linear Regulators	Switch-Mode Power Supply (SMPS) Bias Supplies
Use Scenario: Low-noise, low-cost 12 V/50 mA auxiliary supply derived from rectified mains in industrial PLCs. IC Role / Device Role / Timing Role: PNP series pass transistor regulating output voltage via emitter-follower configuration. Use Value: Delivers ripple-free output with no switching noise; leverages 300 V rating to eliminate pre-regulator stages.	Use Scenario: Standby bias supply powering PWM controller ICs in off-line flyback converters. IC Role / Device Role / Timing Role: High-voltage PNP switch providing isolated gate drive or V_CC startup current. Use Value: Withstands 300 V transient surges during startup; h_FE ≥ 30 ensures reliable turn-on with minimal controller-side drive.
Automotive Body Control Modules	Industrial Sensor Signal Conditioning
Use Scenario: Load switch for 12 V lighting circuits in BCMs requiring reverse-polarity protection and thermal shutdown margin. IC Role / Device Role / Timing Role: High-side PNP switch controlling lamp current with integrated thermal foldback. Use Value: AEC-Q101 qualification ensures reliability over –40°C to +125°C ambient; SOA curve supports 100 ms inductive load transients.	Use Scenario: Precision current source for 4–20 mA loop-powered sensors in hazardous-area transmitters. IC Role / Device Role / Timing Role: Constant-current sink configured with feedback-controlled base bias. Use Value: Tight h_FE spread (30–240) and low I_CBO (<100 nA) minimize drift over temperature and time.

AC/DC Linear Regulators

Switch-Mode Power Supply (SMPS) Bias Supplies

Use Scenario: Low-noise, low-cost 12 V/50 mA auxiliary supply derived from rectified mains in industrial PLCs.

IC Role / Device Role / Timing Role: PNP series pass transistor regulating output voltage via emitter-follower configuration.

Use Value: Delivers ripple-free output with no switching noise; leverages 300 V rating to eliminate pre-regulator stages.

Use Scenario: Standby bias supply powering PWM controller ICs in off-line flyback converters.

IC Role / Device Role / Timing Role: High-voltage PNP switch providing isolated gate drive or V_CC startup current.

Use Value: Withstands 300 V transient surges during startup; h_FE ≥ 30 ensures reliable turn-on with minimal controller-side drive.

Automotive Body Control Modules

Industrial Sensor Signal Conditioning

Use Scenario: Load switch for 12 V lighting circuits in BCMs requiring reverse-polarity protection and thermal shutdown margin.

IC Role / Device Role / Timing Role: High-side PNP switch controlling lamp current with integrated thermal foldback.

Use Value: AEC-Q101 qualification ensures reliability over –40°C to +125°C ambient; SOA curve supports 100 ms inductive load transients.

Use Scenario: Precision current source for 4–20 mA loop-powered sensors in hazardous-area transmitters.

IC Role / Device Role / Timing Role: Constant-current sink configured with feedback-controlled base bias.

Use Value: Tight h_FE spread (30–240) and low I_CBO (<100 nA) minimize drift over temperature and time.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP bipolar power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD350RLG	Same die, TO-252 (DPAK) package; R_JA = 65°C/W vs. 85°C/W for SOT-223; higher I_C rating (0.5 A same, but pulse-rated to 1.5 A)	Better thermal performance in PCB-mounted heatsink applications; less suitable for ultra-compact layouts	Select MJD350RLG when board space permits larger footprint and higher peak current capability is needed
ZTX753	Lower V_CEO (200 V); higher h_FE (min 100); SOT-223 package; not AEC-Q101 qualified	Not rated for direct 230 VAC-derived rails; limited to lower-input-voltage systems like 48 V telecom	Select ZTX753 only for non-automotive, lower-voltage designs where gain stability and cost are prioritized over voltage margin

Compared with MJD350RLG and ZTX753, the MMJT350T1G uniquely balances 300 V capability, AEC-Q101 compliance, and SOT-223 form factor-making it optimal for space-constrained, high-reliability line-operated regulators where voltage headroom and automotive qualification are mandatory.

Availability

MMJT350T1G is available at Aetrix Electronics and suitable for AC/DC linear regulators, SMPS bias supplies, automotive body control modules, and industrial sensor signal conditioning requiring stable component supply and long-term lifecycle support.

Supply support for MMJT350T1G 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.

The MMJT350T1G belongs to onsemi's Bipolar Power Transistor product line, engineered specifically for high-voltage, medium-current linear and switching regulation in line-operated equipment where reliability, thermal robustness, and safety certification are essential.

FAQ

What is the maximum continuous collector current rating for MMJT350T1G?

The MMJT350T1G has a maximum continuous collector current (I_C) rating of 0.5 A at T_C = 25°C. This rating assumes proper heatsinking via the collector tab; operation above 25°C requires linear derating at 22 mW/°C, reducing usable current as case temperature rises. At T_C = 100°C, the effective I_C limit drops to approximately 0.35 A based on its 2.75 W power envelope.

Is MMJT350T1G suitable for automotive applications?

Yes, MMJT350T1G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including body control modules and lighting drivers. Its –55°C to +150°C junction temperature range, HBM ESD rating of Class 3B (≥8 kV), and UL 94 V-0 epoxy meet stringent automotive reliability and safety requirements. The "S" prefix variant (SMMJT350T1G) is explicitly designated for automotive use.

What is the pin configuration of MMJT350T1G in the SOT-223 package?

The MMJT350T1G uses a 4-pin SOT-223 package with the following pinout: Pin 1 = Base, Pin 2 = Collector (connected to metal tab), Pin 3 = Emitter, Pin 4 = Collector (second collector connection). This dual-collector configuration lowers inductance and improves current handling in switching applications, and the tab must be electrically connected to the system ground or collector rail for thermal and electrical integrity.

Does MMJT350T1G have a specified safe operating area (SOA)?

Yes, the MMJT350T1G datasheet includes a detailed active-region safe operating area (SOA) curve (Figure 3), specifying maximum allowable combinations of collector current (I_C) and collector-emitter voltage (V_CE) for pulse widths from 1 μs to DC. The SOA is bounded by thermal limits, second breakdown, and bonding wire current capacity-critical for designing robust linear regulators and switching circuits where transient overloads may occur.

What is the DC current gain (h_FE) range for MMJT350T1G and how is it tested?

The MMJT350T1G specifies h_FE as min 30 at I_C = 50 mA and V_CE = 10 V, and min 20 at I_C = 100 mA and V_CE = 10 V, with typical values reaching 240. These values are measured under controlled lab conditions at T_J = 25°C using standardized transistor test fixtures. Gain varies with temperature and bias point, so designs should verify performance across the full operating range using the h_FE vs. I_C and temperature curves in the datasheet.

MMJT350T1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 300 V

Vce Saturation (Max) @ Ib, Ic:: -

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 30 @ 50mA, 10V

Power - Max:: 650 mW

Frequency - Transition:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

MMJT350T1G FAQ

1.How can I place an order for MMJT350T1G through Aetrix?

Please submit a Request for Quotation (RFQ) for MMJT350T1G 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 MMJT350T1G reliable?

The price and inventory of MMJT350T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMJT350T1G is usually 5 days.

3.What payment methods are accepted for MMJT350T1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMJT350T1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMJT350T1G?

MMJT350T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMJT350T1G 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 MMJT350T1G?

For technical support, including MMJT350T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMJT350T1G requirements.

6.How does Aetrix verify that MMJT350T1G is sourced from the original manufacturer or authorized distributors?

All MMJT350T1G 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 MMJT350T1G meets industry standards.

7.What is the process for return or replacement of MMJT350T1G?

All MMJT350T1G units undergo pre-shipment inspection (PSI). If there is an issue with MMJT350T1G, 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 MMJT350T1G part is unused and in its original packaging.

Return procedure for MMJT350T1G:

1.Submit a request within 90 days.

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

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