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onsemi MMJT9435T1
- Part No.:
- MMJT9435T1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
MMJT9435T1.pdf
- Description:
- TRANS PNP 30V 3A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:7,596
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Product details
Overview
MMJT9435T1 from onsemi is a PNP silicon bipolar junction transistor (BJT) designed for medium-power switching and linear amplification in industrial control, power management, and load driver circuits. It delivers IC = 3.0 A continuous collector current, VCEO(sus) = 30 Vdc minimum sustaining voltage, VCE(sat) = 0.275 Vdc max at IC = 1.2 Adc, hFE ≥ 125 at IC = 0.8 Adc, and operates across –55°C to +150°C junction temperature range.
For engineers reviewing the MMJT9435T1 datasheet, pinout, applications, or equivalent options, key selection criteria include its SOT-223 package thermal performance (RJC = 42°C/W), low saturation voltage under high-current drive, DC gain stability across temperature, and ESD robustness (HBM > 8 kV).
Technical Context
The MMJT9435T1 operates as a single PNP BJT with fixed emitter-base and collector-base junction architecture. Its safe operating area (SOA) is defined by thermal limits (PD = 3.0 W at TC = 25°C) and secondary breakdown constraints, supporting pulsed operation up to 5.0 A peak with appropriate duty cycling.
It exhibits hFE = 90–220 across IC = 0.8–3.0 A and VCE = 1.0 V, with fT = 110 MHz at IC = 500 mA and VCE = 10 V. Input capacitance Cib = 135 pF and output capacitance Cob = 100–150 pF enable predictable switching behavior in <10 MHz applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO(sus) | 30 Vdc min - supports reliable blocking in 24 VDC industrial bus and relay driver applications |
| IC Continuous | 3.0 Adc - enables direct driving of solenoids, LED arrays, or small motors without external current boosting |
| VCE(sat) @ IC=1.2A | 0.275 Vdc max - minimizes conduction loss and self-heating during sustained on-state operation |
| hFE @ IC=0.8A | 125 min - ensures stable base drive requirements and predictable turn-on timing in switch-mode designs |
| RJC | 42°C/W - allows effective heat transfer to PCB copper when mounted on ≥645 mm² collector pad |
| HBM ESD Rating | >8000 V - provides robust handling tolerance during automated assembly and field service |
| fT | 110 MHz - supports high-speed switching in PWM dimming and low-frequency RF amplifier stages |
Pinout & Package
SOT-223 (Case 318E, Style 1) surface-mount package with exposed collector tab for thermal dissipation and mechanical anchoring. Mold compound meets UL 94 V-0 flammability rating at 3.18 mm thickness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (B) | Base | Control input requiring ~20 mAdc base current for full saturation at IC = 1.2 A |
| 2 (C) | Collector | Main current sink terminal; electrically connected to exposed metal tab for thermal and electrical grounding |
| 3 (E) | Emiter | Current source node; tied to system ground or positive rail depending on PNP configuration |
| 4 (C) | Collector | Dual-collector connection improves current sharing and thermal spreading in high-power switching |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free SOT-223 packaging | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) |
| High hFE consistency | hFE ≥ 90 at IC = 3.0 A ensures minimal base drive overhead in high-current linear regulators |
| Low VCE(sat) at high current | 0.55 Vdc max at IC = 3.0 A reduces power loss to ≤1.65 W, easing thermal design in enclosed enclosures |
| Wide operating temperature | –55°C to +150°C TJ range supports deployment in automotive engine compartments and industrial PLCs |
| ESD-hardened structure | HBM Class 3B (>8 kV) and MM Class C (>400 V) reduce risk of assembly-line damage and field failures |
Applications
| Industrial Relay Driver | DC Motor Speed Control |
|---|---|
|
Use Scenario: Driving 24 VDC electromagnetic relays in programmable logic controllers with microcontroller GPIO-level base control. IC Role / Device Role / Timing Role: PNP switch providing low-side current sinking path for relay coil return, enabling active-low logic compatibility. Use Value: VCE(sat) ≤ 0.275 V at 1.2 A ensures relay coil voltage drop remains below 0.3 V, guaranteeing reliable pull-in under worst-case supply sag. |
Use Scenario: Controlling bidirectional brushed DC motor current in battery-powered portable tools using complementary PNP/NPN H-bridge stage. IC Role / Device Role / Timing Role: High-side PNP switch in totem-pole output stage, delivering 3 A peak current per half-bridge leg. Use Value: RJC = 42°C/W and PD = 3.0 W allow continuous 2 A operation on standard FR-4 with 1"² copper pour, eliminating need for heatsinks. |
| LED Array Power Switch | Linear Voltage Regulator Pass Element |
|
Use Scenario: Switching 12–24 V, 2–3 A LED strings in architectural lighting systems with PWM dimming at 1–5 kHz. IC Role / Device Role / Timing Role: Constant-current switch regulating LED string current via base-controlled saturation depth. Use Value: fT = 110 MHz and Cob = 150 pF limit rise/fall times to <100 ns, preventing visible PWM flicker and EMI spikes. |
Use Scenario: Series pass transistor in adjustable 5–15 V linear regulators powering analog sensor front-ends in test equipment. IC Role / Device Role / Timing Role: Linear-mode PNP pass element dissipating up to 2.5 W while maintaining ±1% output regulation. Use Value: hFE ≥ 125 at IC = 0.8 A ensures stable loop gain and low dropout voltage (≤0.6 V) across load and temperature variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX951 | Higher VCEO = 60 V, lower hFE = 75 min at IC = 1 A, TO-92 package (RJA ≈ 200°C/W) | Better suited for higher-voltage flyback snubbers but unsuitable for high-current thermal-limited layouts | Select ZTX951 only when >40 V blocking is required and board space permits larger thermal footprint |
| MJD2955T4 | Same SOT-223 package, VCEO = 60 V, IC = 10 A, but VCE(sat) = 1.3 V max at IC = 8 A - significantly higher conduction loss | Targeted at high-current linear regulators where gain and saturation voltage trade off for ruggedness | Choose MJD2955T4 only when absolute ruggedness and SOA margin outweigh efficiency and thermal constraints |
Compared with ZTX951 and MJD2955T4, the MMJT9435T1 offers optimal balance of low saturation voltage, moderate voltage rating, and SOT-223 thermal performance - making it preferred for compact 24 V industrial switches where efficiency and PCB real estate are critical.
Availability
MMJT9435T1 is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor speed controllers, LED array power switches, and linear voltage regulator pass elements requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MMJT9435T1 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, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMJT9435T1 belongs to onsemi's Bipolar Power Transistor product line, engineered for cost-effective, thermally efficient medium-power switching in industrial automation and power management systems.
FAQ
What is the maximum continuous collector current rating for MMJT9435T1?
The MMJT9435T1 is rated for 3.0 Adc continuous collector current at TC = 25°C. Derating applies above 25°C case temperature - power dissipation must be reduced by 24 mW/°C beyond that point. At TC = 100°C, the usable IC drops to approximately 1.2 A to maintain safe junction temperature within the –55°C to +150°C range. This rating assumes proper PCB copper thermal relief per the datasheet's 1"² FR-4 mounting condition.
Does MMJT9435T1 support Pb-free soldering processes?
Yes, the MMJT9435T1 is manufactured in a Pb-free SOT-223 package compliant with JEDEC J-STD-020 and RoHS Directive 2011/65/EU. It supports standard reflow profiles with peak temperatures up to 260°C for 5 seconds at 1/8" from the case. The epoxy mold compound meets UL 94 V-0 flammability rating at 0.125 inch thickness, ensuring process compatibility and safety compliance.
What is the typical DC current gain (hFE) of MMJT9435T1 at 3.0 A collector current?
The MMJT9435T1 guarantees hFE ≥ 90 at IC = 3.0 Adc, VCE = 1.0 Vdc, and TC = 25°C. Typical performance reaches 110 under those conditions, and hFE remains ≥ 75 even at TJ = 150°C per Figure 4 in the datasheet. This stable gain supports predictable base drive design in high-current linear and switching applications without requiring dynamic bias compensation.
Can MMJT9435T1 be used in linear regulator configurations?
Yes, the MMJT9435T1 is suitable as a series pass element in adjustable linear regulators. Its hFE ≥ 125 at IC = 0.8 A ensures low base drive error and tight output regulation, while VCE(sat) ≤ 0.55 V at 3.0 A limits dropout voltage. Thermal resistance RJC = 42°C/W enables reliable operation up to 2.5 W dissipation on properly designed PCBs - verified in Figure 11's derating curve.
What are the ESD protection ratings for MMJT9435T1?
The MMJT9435T1 features Human Body Model (HBM) ESD rating >8000 V (Class 3B) and Machine Model (MM) rating >400 V (Class C), as tested per ANSI/ESDA/JEDEC JS-001 and JS-002. These ratings reflect internal process-level protection and make the device robust against handling damage during SMT assembly and field maintenance - no external ESD clamps required for typical industrial environments.
MMJT9435T1 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)
MMJT9435T1 FAQ
1.How can I place an order for MMJT9435T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMJT9435T1 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 MMJT9435T1 reliable?
The price and inventory of MMJT9435T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMJT9435T1 is usually 5 days.
3.What payment methods are accepted for MMJT9435T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMJT9435T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMJT9435T1?
MMJT9435T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMJT9435T1 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 MMJT9435T1?
For technical support, including MMJT9435T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMJT9435T1 requirements.
6.How does Aetrix verify that MMJT9435T1 is sourced from the original manufacturer or authorized distributors?
All MMJT9435T1 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 MMJT9435T1 meets industry standards.
7.What is the process for return or replacement of MMJT9435T1?
All MMJT9435T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMJT9435T1, 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 MMJT9435T1 part is unused and in its original packaging.
Return procedure for MMJT9435T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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