onsemi MJD42C1

Overview

MJD42C1 from onsemi is a PNP complementary power transistor in DPAK (Case 369C) 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 low-speed switching and general-purpose amplifier device in industrial power supplies, motor drivers, and linear regulator pass elements.

For engineers reviewing the MJD42C1 datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CEO/I_C derating behavior, h_FE consistency across temperature, R_JC = 6.25°C/W thermal path, and compatibility with legacy TIP42 footprint layouts.

Technical Context

The MJD42C1 operates as a silicon planar epitaxial PNP bipolar junction transistor optimized for surface-mount applications. Its safe operating area (SOA) is defined by thermal limits (T_J ≤ 150°C) and second-breakdown constraints, with pulse operation validated up to 10% duty cycle at T_J(pk) = 150°C.

Electrical behavior is characterized at T_C = 25°C with specified h_FE = 15–75 (I_C = 0.3–3 A), V_CE(sat) ≤ 1.5 V (I_C = 6 A, I_B = 600 mA), and f_T = 3 MHz (I_C = 500 mA, V_CE = 10 V). ESD rating meets HBM Class 3B per JEDEC JS-001.

Key Specifications

Pinout & Package

DPAK (Case 369C) surface-mount package with 4-pin configuration: pins 1 (Base), 2 and 4 (Collector), and 3 (Emitter); thermally enhanced plastic body with UL 94 V−0 epoxy.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TIP42C and MJD42CT4G, the MJD42C1 offers identical PNP power performance in a DPAK rail format ideal for bench validation and small-batch builds, while avoiding TO-220 mechanical constraints and enabling direct comparison against its tape-and-reel counterpart.

Availability

MJD42C1 is available at Aetrix Electronics and suitable for industrial power supplies, DC motor drivers, audio amplifier output stages, and linear regulator pass elements requiring stable component supply and legacy-compatible PNP switching performance.

Supply support for MJD42C1 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MJD42C1 belongs to onsemi's complementary power transistor family designed specifically for robust, cost-effective low-speed switching and linear amplification in surface-mount power stages.

FAQ

What is the maximum junction temperature specification for the MJD42C1?

The MJD42C1 has an operating junction temperature range of −65°C to +150°C. This maximum rating is critical for thermal design - sustained operation above 150°C risks permanent degradation. The device's R_JC = 6.25°C/W and SOA curves must be applied with this limit in mind, especially under pulsed loads where T_J(pk) must remain ≤150°C per Figure 12 in the datasheet. Thermal design for MJD42C1 must ensure case temperature stays within safe bounds to avoid exceeding this absolute limit.

Is the MJD42C1 pin-compatible with the TIP42C?

No, the MJD42C1 is not pin-compatible with the TIP42C. The MJD42C1 uses a DPAK (Case 369C) surface-mount package with pins 1 (Base), 2/4 (Collector), and 3 (Emitter), whereas the TIP42C uses a TO-220 through-hole package with different pinout order and physical dimensions. Although their electrical specifications are closely matched, PCB layout and assembly processes differ fundamentally. Engineers must redesign footprints and revalidate thermal paths when substituting between MJD42C1 and TIP42C.

Does the MJD42C1 support automotive applications?

The base MJD42C1 is not AEC-Q101 qualified; however, onsemi offers NJV-prefix variants (e.g., NJVMJD42CT4G) that are AEC-Q101 qualified and PPAP capable for automotive use. These NJV versions undergo additional stress testing and process controls but share identical electrical and thermal characteristics with the MJD42C1. For automotive designs, specify the NJV-part number - the MJD42C1 itself is intended for industrial and commercial applications unless explicitly qualified via NJV marking.

What is the typical DC current gain (h_FE) of the MJD42C1 at 3 A collector current?

At I_C = 3 A and V_CE = 4 V, the MJD42C1 exhibits a minimum h_FE of 15 and a maximum of 75, per the Electrical Characteristics table. This wide range reflects process variation and necessitates conservative base drive design - for reliable saturation at full load, engineers should size base current using h_FE(min) = 15 to ensure I_B ≥ I_C/15. The actual h_FE measured on a given MJD42C1 unit may fall anywhere within this band depending on operating temperature and individual device variance.

Can the MJD42C1 be used in parallel configurations?

Parallel operation of MJD42C1 devices is not recommended without external emitter resistors due to inherent h_FE and V_BE mismatches that cause current imbalance. The datasheet does not specify matching tolerances or recommend paralleling techniques. If higher current capacity is required, engineers should select a single higher-rated device (e.g., MJ15003) or implement active current-sharing circuitry. Using multiple MJD42C1 units without balancing measures risks thermal runaway and premature failure in one device.