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onsemi MJF32C
- Part No.:
- MJF32C
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3 Full Pack
- Datasheet:
-
MJF32C.pdf
- Description:
- TRANS PNP 100V 3A TO-220FP
- Quantity:
- Payment:
- Shipping:
Inventory:2,865
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Product details
Overview
MJF32C from onsemi is a PNP silicon power transistor in TO-220 FullPak package, rated for 100 VCEO, 3.0 A continuous collector current, and 28 W power dissipation at TC = 25°C. It delivers VCE(sat) ≤ 1.2 V at IC = 3.0 A and supports general-purpose amplifier and switching applications in isolated-package industrial power stages.
For engineers reviewing the MJF32C datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal derating behavior, safe operating area (SOA) limits, switching timing data (tr, tf, td), and direct comparison with complementary NPN MJF31C and functionally similar PNP alternatives.
Technical Context
The MJF32C operates as a medium-power PNP bipolar junction transistor optimized for linear amplification and hard-switching duty in isolated-mount configurations. Its design emphasizes high VCEO(sus) (100 V min), low saturation voltage (1.2 V max at 3.0 A), and robust unclamped inductive energy handling (32 mJ).
Thermal performance is defined by RθJC = 4.46 °C/W and RθJA = 62.5 °C/W, enabling stable operation up to +150°C junction temperature. Switching characteristics include turn-on time <7.0 ns and turn-off time <15 ns under specified pulse conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 Vdc minimum - supports 100 V rail applications without breakdown risk under open-base conditions |
| IC (continuous) | 3.0 Adc - enables sustained load control in motor drivers and power supplies up to ~30 W output |
| VCE(sat) | ≤1.2 Vdc at IC = 3.0 A, IB = 375 mA - minimizes conduction loss and heatsink requirements |
| fT | ≥3.0 MHz at IC = 500 mA - suitable for audio-frequency amplification and moderate-speed switching |
| PD @ TC = 25°C | 28 W - allows high-power operation when mounted on heatsink with case temperature maintained at 25°C |
| Unclamped Eind | 32 mJ - withstands inductive kickback in relay/valve driver circuits without secondary breakdown |
| hFE | 25–50 at IC = 1.0 A - provides predictable DC gain for base-driven switching and analog biasing |
Pinout & Package
Package: TO-220 FullPak (Case 221D, Style 2), surface-mount compatible with isolation pad, UL recognized for 3500 VRMS isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input requiring ~375 mA drive for full saturation at 3.0 A collector current |
| 2 | Collector | Main current sink node; electrically connected to tab - must be isolated from heatsink unless common-emitter reference permits |
| 3 | Emitter | High-current return path; tied to system ground or negative rail in PNP switch configurations |
Key Features
| Feature | Design Value |
|---|---|
| UL Recognition (E69369) | 3500 VRMS isolation rating - enables use in safety-critical industrial controls without external barrier components |
| Low VCE(sat) | 1.2 V max at full 3.0 A load - reduces power loss by >30% vs. legacy PNP transistors with >1.8 V saturation |
| High VCEO(sus) | 100 V minimum sustaining voltage - ensures reliable blocking in 48 V and 72 V battery-fed systems |
| Robust SOA | Secondary breakdown limited only above 150°C - supports repetitive pulsed loads up to 5.0 A peak with proper thermal management |
| Pb-Free option | MJF32CG variant available - meets RoHS compliance without derating or performance trade-offs |
Applications
| DC Motor Control | Linear Power Supply Regulator |
|---|---|
|
Use Scenario: Bidirectional H-bridge half-bridge leg in 24–48 V industrial actuators. IC Role / Device Role / Timing Role: PNP high-side switch controlling motor phase current during reverse polarity commutation. Use Value: 100 VCEO and 32 mJ unclamped energy rating prevent failure during back-EMF transients. |
Use Scenario: Series pass element in adjustable linear regulator delivering up to 3 A at 12 V output. IC Role / Device Role / Timing Role: Linear-mode current amplifier regulating output voltage via base bias feedback loop. Use Value: hFE ≥25 at 1.0 A ensures stable closed-loop gain and low output impedance across load range. |
| Relay Driver Circuit | Overvoltage Protection Switch |
|
Use Scenario: Driving 24 V DC coil relays with inductive flyback suppression. IC Role / Device Role / Timing Role: Low-saturation PNP switch sinking relay coil current during activation. Use Value: VCE(sat) ≤1.2 V minimizes self-heating and extends relay contact life under frequent cycling. |
Use Scenario: Crowbar circuit clamping 48 V bus against overvoltage events in telecom power systems. IC Role / Device Role / Timing Role: Fast-turnoff PNP shunt switch triggered by voltage monitor comparator. Use Value: Turn-off time <15 ns enables sub-microsecond response to transient overvoltage exceeding 100 V threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJF31C | NPN complement; identical package, ratings, and SOA but opposite polarity | Requires inverted drive logic and reversed supply topology | Select MJF31C only when NPN configuration matches existing schematic layout and bias network |
| BD140 | Lower fT (190 kHz), higher VCE(sat) (1.5 V), same TO-126 package (not isolated) | Lacks UL isolation rating and unclamped inductive energy spec | Use BD140 only in non-isolated, low-frequency (<50 kHz), low-reliability consumer-grade designs |
Compared with MJF32C, MJF31C offers identical thermal and switching performance in NPN form but requires redesign of drive and power topology, while BD140 sacrifices isolation, speed, and saturation efficiency for cost reduction in non-critical applications.
Availability
MJF32C is available at Aetrix Electronics and suitable for industrial motor control, linear power regulation, relay driving, and overvoltage protection circuits requiring stable component supply, long-term lifecycle support, and UL-recognized isolation capability.
Supply support for MJF32C 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 IoT markets.
The MJF32C belongs to onsemi's Complementary Silicon Plastic Power Transistor family, designed specifically for isolated-package, medium-power switching and amplification where safety-rated insulation and rugged SOA are mandatory.
FAQ
What is the maximum continuous collector current rating for MJF32C?
The MJF32C is rated for 3.0 Adc continuous collector current at case temperature TC = 25°C. Derating is required above 25°C at 0.22 W/°C, limiting usable current in high-temperature environments. This rating assumes proper heatsinking and adherence to the Safe Operating Area (SOA) curve shown in Figure 5 of the official MJF32C datasheet.
Does MJF32C have UL recognition and what does that mean for my design?
Yes, MJF32C is UL Recognized under File #E69369 for 3500 VRMS isolation. This means the TO-220 FullPak package provides certified galvanic isolation between collector (tab) and emitter/base terminals, eliminating need for additional creepage/clearance barriers in safety-compliant industrial equipment. The MJF32C meets reinforced insulation requirements per IEC 61800-5-1.
Can MJF32C replace BD140 in an existing circuit?
Direct replacement of BD140 with MJF32C is not recommended without layout and drive circuit review. While both are PNP power transistors, MJF32C uses TO-220 FullPak (isolated tab), has higher VCEO (100 V vs. 80 V), lower VCE(sat) (1.2 V vs. 1.5 V), and faster switching. The MJF32C requires different mounting (isolated heatsink) and may alter bias point due to higher hFE spread.
What is the safe operating area (SOA) limitation for MJF32C at 100 V collector-emitter voltage?
At VCE = 100 V, the MJF32C SOA limits continuous DC current to approximately 0.2 A (per Figure 5). For pulsed operation, second-breakdown limits allow up to 1.0 A for 1 ms pulses at TJ ≤ 150°C. Exceeding these boundaries risks thermal runaway or bond-wire failure. Always validate using the normalized ZJC(t) curves in Figure 4 when designing with MJF32C.
Is there a Pb-free version of MJF32C and how does it differ?
Yes, the MJF32CG is the Pb-free variant of MJF32C. It shares identical electrical specifications, thermal performance, and mechanical dimensions. The only difference is lead finish composition - MJF32CG complies with RoHS Directive 2011/65/EU and JEDEC J-STD-609 Category 2a marking. No derating or requalification is needed when substituting MJF32CG for MJF32C in new designs.
MJF32C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3 Full Pack
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 1.2V @ 375mA, 3A
- Current - Collector Cutoff (Max):
- 300µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 10 @ 3A, 4V
- Power - Max:
- 2 W
- Frequency - Transition:
- 3MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220FP
MJF32C FAQ
1.How can I place an order for MJF32C through Aetrix?
Please submit a Request for Quotation (RFQ) for MJF32C 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 MJF32C reliable?
The price and inventory of MJF32C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJF32C is usually 5 days.
3.What payment methods are accepted for MJF32C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJF32C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJF32C?
MJF32C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJF32C 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 MJF32C?
For technical support, including MJF32C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJF32C requirements.
6.How does Aetrix verify that MJF32C is sourced from the original manufacturer or authorized distributors?
All MJF32C 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 MJF32C meets industry standards.
7.What is the process for return or replacement of MJF32C?
All MJF32C units undergo pre-shipment inspection (PSI). If there is an issue with MJF32C, 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 MJF32C part is unused and in its original packaging.
Return procedure for MJF32C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MJF32C Tags
-
MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
onsemi
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
onsemi
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MMBT2222A-TP
Micro Commercial Co
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MMBTA06LT1G
onsemi
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MMBT2222ALT1G
onsemi
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