Nexperia USA Inc. MJD45H11J

Overview

MJD45H11J from Nexperia is a PNP high-power bipolar transistor in DPAK (SOT428C) package, rated for −80 V V_CEO, −8 A continuous collector current, and 20 W junction-to-mounting-base power dissipation. It serves as a robust load switch or linear-mode voltage regulator in industrial power management systems requiring high thermal efficiency and low saturation voltage.

For engineers reviewing the MJD45H11J datasheet, MJD45H11J pinout, MJD45H11J application, or MJD45H11J equivalent, key selection criteria include verified DC current gain (h_FE ≥ 60 at −2 A), −1 V V_CE(sat) at −8 A/−400 mA drive, thermal resistance R_th(j-mb) = 6.25 K/W, and compatibility with FR4 PCB mounting using 1 cm² tin-plated collector pad.

Technical Context

This PNP BJT operates in active, saturation, and cutoff regions with defined safe operating area (SOA) up to T_j = 150 °C. Its switching performance is characterized by t_on = 225 ns, t_s = 280 ns, and t_f = 100 ns under specified test conditions (V_CC = −12.5 V, I_Bon/I_Boff = ±0.5 A).

The device features electrically similar behavior to the MJD45H series and pairs with NPN complement MJD44H11. Its base-emitter cut-off current (I_EBO) is ≤ −1 µA at −5 V, and collector-emitter leakage (I_CES) remains ≤ −50 µA at 150 °C junction temperature.

Key Specifications

Pinout & Package

Package: DPAK (SOT428C), surface-mounted plastic package with 3 leads (lead 1 cropped), mounting base electrically connected to collector. Dimensions per IEC/JEDEC SC-63/TO-252 standard; requires 1 cm² tin-plated copper pad on FR4 PCB for thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-power switching applications.

Compared with MJD45H11J, the base-marked MJD45H11 offers identical electrical behavior but lacks J-suffix traceability, while BDX54C trades SMD thermal efficiency for through-hole legacy support-making MJD45H11J optimal for new designs prioritizing power density and thermal reliability.

Availability

MJD45H11J is available at Aetrix Electronics and suitable for industrial power management, motor drive, and linear voltage regulator applications requiring stable component supply, consistent thermal performance, and SMD manufacturability.

Supply support for MJD45H11J 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

Nexperia is a global semiconductor expert delivering high-performance logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for industrial and automotive markets.

MJD45H11J belongs to Nexperia's high-power bipolar transistor product line, engineered for robust linear and switching operation in demanding power conversion, load control, and thermal-critical applications.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The MJD45H11J has a maximum junction temperature (T_j) of 150 °C, validated across its full −8 A current range and −80 V blocking capability. Operation at this limit requires proper thermal design-specifically, a 1 cm² tin-plated copper pad on FR4 PCB-to maintain R_th(j-mb) ≤ 6.25 K/W and avoid permanent degradation.

Can MJD45H11J replace MJD45H11 in existing designs?

Yes-MJD45H11J is functionally and electrically identical to MJD45H11, differing only in marking code ('J' suffix) and tape-and-reel packaging configuration. Pinout, thermal characteristics, SOA, and all electrical parameters match exactly, enabling drop-in replacement without layout or thermal redesign.

What is the recommended PCB footprint for optimal thermal performance?

The official Nexperia footprint specifies a 6.15 mm × 5.8 mm occupied area with 1.8 mm solder paste stencil opening and 4.57 mm × 6.0 mm solder lands. Critical for thermal performance is the 1 cm² tin-plated copper pad connected directly to the mounting base (pin 2), which enables the full 20 W junction-to-mounting-base power dissipation.

How does the mounting base connection affect circuit layout?

The mounting base is electrically tied to the collector (pin 2), so PCB layout must treat it as a high-current, high-voltage node-not a ground plane. Isolation from adjacent traces and components is required, and the pad must connect only to the collector net. Failure to isolate risks short-circuiting or thermal crosstalk in multi-transistor power stages.