Diodes Incorporated MJD31CHQ-13

Overview

MJD31CHQ-13 from Diodes Incorporated is a 100V NPN medium-power transistor in TO252 (DPAK) package, rated for 3A continuous collector current and 100V V_CEO, with AEC-Q101 qualification for automotive power switching and linear amplification. It delivers 1.2V V_CE(sat) at I_C = 3A/ I_B = 375mA and features 4000V HBM ESD rating.

For engineers reviewing the MJD31CHQ-13 datasheet, MJD31CHQ-13 pinout, MJD31CHQ-13 application, or MJD31CHQ-13 equivalent, key selection criteria include its 100V breakdown voltage, TO252 thermal performance (R_θJC = 3.7°C/W), AEC-Q101 compliance, and suitability for DC-DC converter switches, motor drivers, and automotive lighting control circuits.

Technical Context

This NPN bipolar junction transistor operates as a high-voltage, medium-current switch or linear amplifier with guaranteed BV_CEO ≥ 100V and I_C = 3A continuous rating. Its safe operating area supports pulse currents up to 5A and maintains stable gain (h_FE = 25–120 across 0.5–3A) under automotive temperature range (−55°C to +150°C).

Thermal design leverages the exposed collector pad in TO252: R_θJC = 3.7°C/W enables efficient heat transfer to PCB copper, while R_θJA varies from 48°C/W (25mm × 25mm 2oz Cu) to 86°C/W (minimum pad layout), directly impacting power derating in compact automotive modules.

Key Specifications

Pinout & Package

Package: TO252 (DPAK), surface-mount, with exposed collector pad for thermal and electrical connection. Molded plastic body meets UL 94V-0 flammability rating and RoHS 3 / "Green" compliance (Br+Cl <1500 ppm, Sb <1000 ppm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STN3PF10 and MJD32C-1, the MJD31CHQ-13 provides current-controlled switching with predictable h_FE-based drive, superior linearity for analog control, and proven thermal behavior in TO252 - making it optimal for cost-sensitive, thermally constrained automotive power stages where MOSFET gate drive complexity is undesirable.

Availability

MJD31CHQ-13 is available at Aetrix Electronics and suitable for automotive lighting control, industrial DC-DC converters, brushed DC motor drives, and HVAC blower circuits requiring stable component supply, AEC-Q101 compliance, and TO252 thermal performance.

Supply support for MJD31CHQ-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.

The MJD31CHQ-13 belongs to Diodes' AEC-Q101-qualified medium-power transistor family, designed specifically for robust, thermally efficient switching and amplification in automotive power electronics and industrial control systems.

FAQ

What is the maximum allowable junction temperature for MJD31CHQ-13?

The absolute maximum junction temperature is +150°C, as specified in the Absolute Maximum Ratings table. Operation above this limit risks permanent device failure. Derating curves show that maximum power dissipation drops linearly from 2.60W at 25°C ambient to zero at 150°C case temperature when mounted on 25mm × 25mm 2oz copper.

Is MJD31CHQ-13 suitable for linear amplifier applications?

Yes - its h_FE stability across collector current (25–120 at I_C = 0.5–3A) and low V_CE(sat) support Class-A and Class-AB linear operation. However, thermal design must accommodate continuous power dissipation; R_θJC = 3.7°C/W requires adequate PCB copper area to maintain T_J ≤ 150°C.

Does MJD31CHQ-13 require a heatsink in standard TO252 mounting?

No external heatsink is required if the exposed collector pad is soldered to ≥25mm × 25mm of 2oz copper on FR4. Under those conditions, R_θJA = 48°C/W allows 2.60W dissipation at 25°C ambient. Smaller pads increase thermal resistance - e.g., minimum recommended pad yields R_θJA = 86°C/W, limiting usable power to ~1.45W.

How does the AEC-Q101 qualification impact MJD31CHQ-13's use in non-automotive applications?

AEC-Q101 qualification confirms rigorous stress testing (HTOL, TC, UHAST, etc.) and manufacturing in IATF16949-certified facilities - providing higher confidence in long-term reliability, parametric consistency, and defect rates. These benefits apply equally in industrial, medical, or telecom applications where field failure risk must be minimized.