onsemi MMBT5401

Overview

MMBT5401 from ON Semiconductor is a PNP epitaxial silicon transistor designed for high-voltage general-purpose amplification and switching applications, featuring V_CEO = −150 V, I_C = −600 mA, and f_T = 100–300 MHz. It operates across −55°C to +150°C and is commonly used in voltage-level shifting, relay drivers, and high-side load switches in industrial control circuits.

For engineers reviewing the MMBT5401 datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin, DC current gain at multiple operating points, saturation voltage under defined drive conditions, thermal resistance (R_θJA = 357°C/W), and SOT-23 package compatibility with automated assembly.

Technical Context

The MMBT5401 is a discrete PNP bipolar junction transistor with epitaxial base construction, optimized for stable high-voltage operation and moderate-frequency signal amplification. Its design supports linear amplification (h_FE = 50–240 across I_C = −0.1 to −50 mA) and saturated switching (V_CE(sat) ≤ −0.5 V at I_C = −50 mA / I_B = −5 mA).

Thermal performance is defined for FR-4 PCBs with minimum land pattern (R_θJA = 357°C/W); derating is 2.8 mW/°C above 25°C. Electrical characteristics are specified at T_A = 25°C, with validated limits up to 100°C for leakage (I_CBO ≤ −50 μA at V_CB = −120 V, T_A = 100°C).

Key Specifications

Pinout & Package

SOT-23 (JEDEC TO-236AB) 3-lead plastic surface-mount package with gull-wing leads; standardized footprint compatible with automated pick-and-place and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose amplifier and switch applications.

Compared with MMBT5401, MMBT5551 offers extended voltage margin at the expense of low-current gain stability, while BC807-40 delivers superior gain and thermal efficiency but cannot replace MMBT5401 in ≥100 V systems due to its −45 V V_CEO limit.

Availability

MMBT5401 is available at Aetrix Electronics and suitable for industrial relay drivers, high-voltage level shifters, audio pre-amplifiers, and overvoltage protection circuits requiring stable component supply and long-term manufacturability.

Supply support for MMBT5401 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

ON Semiconductor (formerly Fairchild Semiconductor) is a global supplier of energy-efficient semiconductor components, specializing in power management, analog, and discrete devices for industrial, automotive, and computing markets.

The MMBT5401 belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered for robust high-voltage switching and amplification in cost-sensitive, space-constrained applications where reliability across wide temperature ranges is essential.

FAQ

What is the maximum collector-emitter voltage rating for the MMBT5401?

The MMBT5401 has a guaranteed V_CEO rating of −150 V at T_A = 25°C, verified per JEDEC stress testing standards. This rating applies under continuous DC conditions with proper thermal management; pulsed operation requires consultation with ON Semiconductor's application engineering team for duty-cycle validation. The MMBT5401 maintains this rating across its full operating temperature range (−55°C to +150°C) when derated per datasheet thermal curves.

Does the MMBT5401 support high-frequency signal amplification?

Yes, the MMBT5401 delivers an f_T of 100–300 MHz under standard test conditions (I_C = −10 mA, V_CE = −10 V, f = 100 MHz), making it suitable for audio-frequency amplification and low-MHz signal conditioning. Its 6.0 pF output capacitance and 8.0 dB noise figure further confirm viability in preamplifier stages up to 20 kHz. For RF applications above 10 MHz, layout parasitics and bias stability must be validated per actual circuit implementation.

What is the typical DC current gain (h_FE) of the MMBT5401 at different collector currents?

The MMBT5401 exhibits h_FE = 50–240 depending on operating point: minimum 50 at I_C = −50 mA, 60–240 at I_C = −10 mA, and 50 at I_C = −0.1 mA (all at V_CE = −5.0 V). This wide range reflects its design for both switching (where gain consistency is secondary) and linear amplification (where bias point selection directly impacts gain stability). Designers should consult the h_FE vs. I_C curve in Figure 1 of the MMBT5401 datasheet for precise interpolation.

Can the MMBT5401 be used in surface-mount automated assembly processes?

Yes, the MMBT5401 is packaged in the industry-standard SOT-23 (JEDEC TO-236AB) case with gull-wing leads, fully compatible with IPC-7351-compliant footprints and standard reflow profiles (including lead-free). Its 2.92 mm × 1.30 mm body size and 0.95 mm lead pitch support high-density PCB layouts. The MMBT5401_D87Z variant ships in 13-inch tape-and-reel format (10,000 pcs), optimized for high-volume SMT line integration.

How does the thermal performance of the MMBT5401 compare to other SOT-23 transistors?

The MMBT5401 has an R_θJA of 357°C/W on a standard FR-4 board (76 mm × 114 mm, 1.57 mm thick, minimum land pattern), which is typical for SOT-23 discrete transistors without thermal pads. Its 2.8 mW/°C derating slope above 25°C aligns with industry norms. Compared to alternatives like BC807-40 (R_θJA = 300°C/W), the MMBT5401 trades slightly higher thermal resistance for superior voltage capability-making it optimal where HV robustness outweighs marginal thermal advantage.