onsemi MJD253T4

Overview

MJD253T4 from onsemi is a PNP silicon power transistor in DPAK-3 surface-mount package, rated for 100 V V_CEO, 4.0 A continuous collector current, and 12.5 W power dissipation at T_C = 25 °C. It delivers high DC current gain (h_FE = 40–180 at I_C = 200 mA), low V_CE(sat) (0.3–0.6 V), and 40 MHz f_T, designed specifically for low-voltage, low-power audio amplifier stages.

For engineers reviewing the MJD253T4 datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q101 qualification, Pb-free RoHS-compliant DPAK-3 footprint, complementary pairing with MJD243T4, and thermal performance under surface-mount PCB layout constraints.

Technical Context

This PNP bipolar junction transistor operates in linear amplification and switching modes with verified safe operating area up to 100 V and 4 A under pulsed conditions. Its annular construction ensures low leakage (I_CBO ≤ 100 nA), while ESD ratings of HBM Class 3B confirm robustness for automotive assembly environments.

The device features thermally optimized DPAK-3 packaging with R_JC = 10 °C/W and R_JA = 89.3 °C/W (FR-4, 75 mm², 2 oz Cu), enabling stable operation across −65 °C to +150 °C junction temperature range. Its V_BE(sat) ≤ 1.8 V at I_C = 2.0 A supports efficient base drive in Class AB output stages.

Key Specifications

Pinout & Package

DPAK-3 package (Case 369C), 6.10 × 6.54 × 2.28 mm, surface-mount, Pb-free, RoHS-compliant, with exposed collector tab for thermal conduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD253T4, MJD253T4G offers identical performance with formalized Pb-free labeling, while BD240C trades compact DPAK-3 integration and 40 MHz bandwidth for lower cost and legacy through-hole compatibility - making MJD253T4 optimal for space-constrained, high-fidelity, and automotive-qualified designs.

Availability

MJD253T4 is available at Aetrix Electronics and suitable for automotive audio amplifiers, industrial linear power supplies, consumer audio equipment, and LED driver circuits requiring stable component supply, AEC-Q101 traceability, and surface-mount manufacturability.

Supply support for MJD253T4 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 MJD253T4 belongs to onsemi's complementary plastic power transistor family, engineered for low-voltage, low-power audio amplification and linear regulation where high h_FE, low saturation voltage, and automotive qualification are essential.

FAQ

What is the maximum junction temperature rating for the MJD253T4?

The MJD253T4 has an operating junction temperature range of −65 °C to +150 °C, as specified in the Absolute Maximum Ratings table. This allows reliable operation in under-hood automotive environments and enclosed industrial enclosures without active cooling, provided thermal design respects R_JA = 89.3 °C/W on standard FR-4.

Is the MJD253T4 pin-compatible with the MJD243T4?

No - the MJD253T4 (PNP) and MJD243T4 (NPN) share identical DPAK-3 package pinout (Pin 1: Base, Pins 2&4: Collector, Pin 3: Emitter), but their complementary polarity means they cannot be interchanged electrically without circuit redesign. Their mechanical compatibility enables symmetric layout in push-pull amplifier PCBs.

Does the MJD253T4 require a heatsink in typical audio amplifier applications?

In continuous 4 A operation, yes - the MJD253T4 dissipates up to 12.5 W at T_C = 25 °C, requiring a heatsink or ≥75 mm² 2 oz copper pad. At 1–2 A average audio output current, the DPAK-3 package can operate without external heatsink on properly designed PCBs per Figure 1 derating curves.

What does the "NJV" prefix in NJVMJD253T4G* indicate?

The "NJV" prefix identifies the MJD253T4 as configured for automotive and other applications requiring unique site and control change requirements. It confirms AEC-Q101 qualification, PPAP capability, and enhanced traceability - not a different die, but a controlled manufacturing and documentation stream aligned with automotive quality systems.

Can the MJD253T4 be used in switching power supply applications?

Yes - the MJD253T4 supports switching operation with documented t_on/t_off times (Figure 8–9), 100 V V_CEO, and 8 A peak current rating. However, its f_T = 40 MHz and moderate Cob = 50 pF make it best suited for <500 kHz hard-switching or resonant topologies; MOSFETs are preferred above 1 MHz.