onsemi MJD41CT4

Overview

MJD41CT4 from onsemi is an NPN silicon power transistor in DPAK (TO-252) package, rated for 100 V_CEO, 6 A continuous collector current, and 20 W power dissipation at T_C = 25°C. It serves as a general-purpose amplifier and low-speed switching device in industrial motor drivers, linear power supplies, and relay interface circuits.

For engineers reviewing the MJD41CT4 datasheet, pinout, applications, or equivalent options, key selection criteria include its 100 V breakdown rating, 6 A DC current capability, thermal resistance of 6.25°C/W (junction-to-case), AEC-Q101 qualification for automotive use, and Pb-free DPAK surface-mount compatibility.

Technical Context

This NPN bipolar junction transistor operates with a minimum DC current gain (h_FE) of 30 at I_C = 0.3 A and V_CE = 4 V, dropping to 15 at I_C = 3 A under same conditions. Its V_CE(sat) is ≤1.5 V at I_C = 6 A and I_B = 600 mA, supporting robust saturation in switching applications.

Thermal performance is defined by R_JC = 6.25°C/W and R_JA = 71.4°C/W (on minimum recommended PCB pad), enabling stable operation up to +150°C junction temperature. The device meets UL 94 V-0 flammability standard and is RoHS compliant with "G" suffix denoting Pb-free packaging.

Key Specifications

Pinout & Package

DPAK (TO-252-3) surface-mount package with exposed drain pad (pin 2 & 4 tied internally to collector). Dimensions: 6.10 × 6.54 × 2.28 mm, pitch 2.29 mm. Thermally optimized for PCB copper pour attachment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TIP41C and MJD41CRLG, the MJD41CT4 offers superior surface-mount manufacturability, verified automotive qualification (NJV variant), and identical core switching performance-making it the preferred choice for new SMT-based automotive and industrial power designs.

Availability

MJD41CT4 is available at Aetrix Electronics and suitable for industrial motor control, linear power supply regulation, and automotive relay driver applications requiring stable component supply across extended product lifecycles.

Supply support for MJD41CT4 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, and cloud infrastructure markets.

The MJD41CT4 belongs to onsemi's complementary power transistor family designed for robust, cost-effective amplification and switching in harsh-environment applications-including automotive under-hood systems and industrial automation.

FAQ

What is the maximum safe operating voltage for MJD41CT4 in switching applications?

The MJD41CT4 has a guaranteed V_CEO(sus) of 100 V under pulsed conditions (I_C = 30 mA, I_B = 0). For reliable long-term switching, operation should remain ≤80 V to maintain margin against voltage transients and temperature-induced derating. Exceeding 100 V risks avalanche breakdown and permanent damage to the MJD41CT4.

Does MJD41CT4 require a heatsink in 6 A continuous operation?

Yes - at 6 A continuous collector current, the MJD41CT4 dissipates up to ~9 W (based on V_CE(sat) ≈ 1.5 V). With R_JA = 71.4°C/W, ambient operation would exceed 150°C junction limit without thermal management. A heatsink maintaining T_C ≤ 75°C is required; the MJD41CT4's low R_JC (6.25°C/W) enables efficient heat transfer when mounted to copper pour or external heatsink.

Is MJD41CT4 pin-compatible with TIP41C?

No - the MJD41CT4 uses a 4-pin DPAK (TO-252-3) package with collector on pins 2 & 4 and base/emitter on pins 1 & 3, while the TIP41C uses a 3-pin TO-220 package with different pin order (base-collector-emitter). Though electrically similar, PCB layout and thermal mounting differ significantly; the MJD41CT4 is not a drop-in replacement without board revision.

What does the "NJV" prefix mean in NJVMJD41CT4G*?

The "NJV" prefix in NJVMJD41CT4G* indicates automotive-grade manufacturing with unique site and process control requirements. It signifies AEC-Q101 qualification, PPAP capability, enhanced traceability (lot-level data), and dedicated production line controls - distinguishing it from commercial-grade MJD41CT4G. This prefix confirms suitability for safety-critical automotive subsystems.

Can MJD41CT4 be used in linear amplifier configurations?

Yes - the MJD41CT4 supports linear operation with h_FE ranging from 30 to 75 (depending on I_C), and specified V_BE(on) ≤ 2 V at I_C = 6 A. Its SOA curve (Figure 12) permits DC biasing within thermal limits when properly heatsinked. However, due to moderate f_T (≥3 MHz), it is best suited for audio-frequency or low-bandwidth analog amplifiers, not RF or high-fidelity applications.