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onsemi MMJT9435T1G
- Part No.:
- MMJT9435T1G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
MMJT9435T1G.pdf
- Description:
- TRANS PNP 30V 3A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:2,615
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Product details
Overview
MMJT9435T1G from onsemi is a PNP silicon bipolar junction transistor (BJT) in SOT-223 package, rated for 3.0 A continuous collector current and 30 V collector-emitter sustaining voltage, with VCE(sat) ≤ 0.275 V at IC = 1.2 A and hFE ≥ 125 at IC = 0.8 A - used in high-current linear regulation, power switching, and load control circuits.
For engineers reviewing the MMJT9435T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its SOT-223 thermal performance (RJC = 42°C/W), Pb-free compliance, ESD robustness (>8 kV HBM), and verified DC gain stability across −55°C to +150°C junction temperature range.
Technical Context
This PNP BJT operates in active, saturation, and cutoff regions with defined safe operating area (SOA) limits up to 100 ms pulses. Its base-emitter on voltage is 1.10 V at IC = 1.2 A and VCE = 4.0 V, while saturation behavior is characterized by VBE(sat) = 1.25 V at IC = 3.0 A and IB = 0.3 A.
Dynamic performance includes fT = 110 MHz at IC = 500 mA and VCE = 10 V, with Cob = 150 pF max at VCB = 10 V and Cib = 135 pF at VEB = 8.0 V - supporting moderate-speed switching in industrial power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO(sus) | 30 V min - supports reliable blocking in 24 V rail applications without breakdown |
| IC (cont.) | 3.0 A - enables direct drive of medium-power loads like solenoids or LED arrays |
| VCE(sat) | 0.275 V max @ IC = 1.2 A - minimizes conduction loss and self-heating in saturated-switching mode |
| hFE | 125 min @ IC = 0.8 A - ensures stable base drive design with margin for gain degradation over temperature |
| RJC | 42°C/W - allows efficient heat transfer from die to PCB copper pad in SOT-223 footprint |
| HBM ESD | >8000 V - provides robust handling in automated assembly and field-replaceable modules |
Pinout & Package
SOT-223 (Case 318E, Style 1) surface-mount package with integrated heat sink tab (pin 2 and 4 internally connected to collector); thermally enhanced for PCB-mounted power dissipation up to 3.0 W at TC = 25°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (B) | Base | Control terminal requiring 20–300 mA base drive to saturate at 1.2–3.0 A collector current |
| 2 (C) | Collector | Main high-current output node; electrically tied to exposed thermal pad (pin 4) for low-impedance heat path |
| 3 (E) | Emitter | Reference terminal for PNP topology; connects to higher-potential rail in high-side switch configurations |
| 4 (C) | Collector (thermal pad) | Internal connection to pin 2; must be soldered to ≥645 mm² copper area for rated 3.0 W power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free SOT-223 packaging | Meets RoHS Directive 2011/65/EU and UL 94 V-0 flammability rating at 3.175 mm thickness |
| High hFE consistency | Guaranteed hFE ≥ 90 at IC = 3.0 A ensures predictable base drive sizing across production lots |
| Low VCE(sat) at high current | 0.55 V max @ IC = 3.0 A enables <1.7 W conduction loss in full-load switching operation |
| Extended temperature range | −55°C to +150°C operating junction range supports under-hood automotive and industrial ambient environments |
| ESD-hardened structure | Class 3B Human Body Model rating (>8 kV) reduces risk of latent damage during board-level handling and test |
Applications
| Industrial Motor Control | Automotive Load Switching |
|---|---|
|
Use Scenario: Driving 24 V DC brushed motors in programmable logic controller (PLC) output modules. IC Role / Device Role / Timing Role: High-side PNP switch controlling motor enable path with fast turn-off via base pull-down. Use Value: VCE(sat) ≤ 0.275 V at 1.2 A limits power loss to <0.33 W, reducing heatsink requirements in dense I/O modules. |
Use Scenario: Controlling fuel pump relay coil in 12 V automotive systems with microcontroller GPIO interface. IC Role / Device Role / Timing Role: Medium-current PNP driver interfacing between 3.3 V MCU and inductive load, using external base resistor. Use Value: hFE ≥ 125 at 0.8 A ensures <6.4 mA base drive suffices for 0.8 A coil current, easing MCU sourcing capability. |
| Power Supply OR-ing | LED Current Regulation |
|
Use Scenario: Diode-replacement circuit in redundant 24 V DC power supplies to minimize voltage drop and heat generation. IC Role / Device Role / Timing Role: PNP-based active OR-ing switch operating in linear region to maintain <30 mV forward drop. Use Value: RJC = 42°C/W and 3.0 W power rating allow sustained 2.5 A operation with <105°C junction rise on standard FR-4 PCB. |
Use Scenario: Constant-current sink for high-brightness white LED strings in signage and lighting control panels. IC Role / Device Role / Timing Role: Emitter-follower configured as adjustable current source with feedback resistor to ground. Use Value: VBE(on) = 1.10 V at 1.2 A enables precise current setting with <1% drift over −40°C to +85°C ambient. |
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 |
|---|---|---|---|
| ZTX951 | Higher VCEO = 60 V but lower hFE = 100 min @ IC = 1 A; SOT-223 package, same pinout | Better suited for 48 V systems; less gain margin for low-base-drive designs | Select ZTX951 when higher blocking voltage is required and base drive capability is sufficient |
| MJD2955T4 | TO-220 package, 10 A rating, VCEO = 60 V; significantly larger footprint and thermal mass | Requires heatsink for >1 A continuous; not drop-in for SOT-223 layout | Choose MJD2955T4 only when >3 A current or forced-air cooling is needed |
Compared with ZTX951 and MJD2955T4, MMJT9435T1G delivers optimal balance of compact SOT-223 form factor, 3.0 A capability, and high DC gain - making it preferred for space-constrained 24 V industrial controls where thermal management relies on PCB copper rather than external heatsinks.
Availability
MMJT9435T1G is available at Aetrix Electronics and suitable for industrial motor control, automotive load switching, power supply OR-ing, and LED current regulation requiring stable component supply, Pb-free compliance, and extended temperature reliability.
Supply support for MMJT9435T1G 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 specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMJT9435T1G belongs to onsemi's bipolar power transistor product line, engineered for high-current, medium-voltage linear and switching applications in harsh-environment industrial and transportation systems.
FAQ
What is the maximum continuous collector current rating for MMJT9435T1G?
The MMJT9435T1G is rated for 3.0 A continuous collector current at TC = 25°C. Derating applies above 25°C case temperature - 24 mW/°C reduction per the datasheet thermal curve. This rating assumes proper PCB copper area (1" sq. FR-4) for heat dissipation. Exceeding this current without thermal mitigation risks junction overheating beyond the −55°C to +150°C operational limit.
Does MMJT9435T1G have a Pb-free designation, and what does the 'G' suffix indicate?
Yes, the 'G' suffix in MMJT9435T1G explicitly denotes Pb-free (RoHS-compliant) construction per onsemi's ordering nomenclature. The device uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3. It is functionally and dimensionally identical to the non-Pb-free MMJT9435T1, with no performance trade-offs.
What is the pin configuration of MMJT9435T1G, and how is the thermal pad connected?
The MMJT9435T1G uses SOT-223 package with pin 1 = Base, pin 2 = Collector, pin 3 = Emitter, and pin 4 = Collector (thermal pad). Pins 2 and 4 are internally shorted to the collector, forming a low-thermal-resistance path to PCB copper. The exposed pad must be soldered to a ≥645 mm² copper area for full 3.0 W power rating.
Can MMJT9435T1G be used in linear regulator applications, and what limits its safe operating area?
Yes, MMJT9435T1G is suitable for linear pass transistor roles due to its specified SOA curves (Figure 10). Safe operation requires staying within the thermal limit (dictated by RJA = 174°C/W on minimal copper) and secondary breakdown boundary - especially critical at VCE > 10 V and IC > 0.5 A. Pulse width and duty cycle must be validated per Figure 12 transient thermal data.
How does the DC current gain (hFE) of MMJT9435T1G vary with collector current and temperature?
Per the datasheet, hFE is guaranteed ≥125 at IC = 0.8 A, ≥110 at IC = 1.2 A, and ≥90 at IC = 3.0 A (all at VCE = 1.0 V, TC = 25°C). Gain decreases with rising temperature and higher current - Figure 3 shows hFE dropping ~30% from 25°C to 150°C at IC = 1.0 A. Designers must verify minimum gain at worst-case operating conditions.
MMJT9435T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 550mV @ 300mA, 3A
- Current - Collector Cutoff (Max):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 125 @ 800mA, 1V
- Power - Max:
- 3 W
- Frequency - Transition:
- 110MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223 (TO-261)
MMJT9435T1G FAQ
1.How can I place an order for MMJT9435T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMJT9435T1G 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 MMJT9435T1G reliable?
The price and inventory of MMJT9435T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMJT9435T1G is usually 5 days.
3.What payment methods are accepted for MMJT9435T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMJT9435T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMJT9435T1G?
MMJT9435T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMJT9435T1G 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 MMJT9435T1G?
For technical support, including MMJT9435T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMJT9435T1G requirements.
6.How does Aetrix verify that MMJT9435T1G is sourced from the original manufacturer or authorized distributors?
All MMJT9435T1G 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 MMJT9435T1G meets industry standards.
7.What is the process for return or replacement of MMJT9435T1G?
All MMJT9435T1G units undergo pre-shipment inspection (PSI). If there is an issue with MMJT9435T1G, 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 MMJT9435T1G part is unused and in its original packaging.
Return procedure for MMJT9435T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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