onsemi MMBT5401-D87Z

Overview

MMBT5401-D87Z from ON Semiconductor is a PNP epitaxial silicon transistor designed for high-voltage general-purpose amplification and switching, with V_CEO = −150 V, I_C = −600 mA, and f_T = 100–300 MHz. It operates across −55°C to +150°C and delivers low V_CE(sat) (−0.2 V at −10 mA/−1 mA) in SOT-23 packaging for compact power control circuits.

For engineers reviewing the MMBT5401-D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin, DC current gain at multiple operating points, thermal resistance (R_θJA = 357°C/W), saturation behavior under pulsed loads, and SOT-23 terminal compatibility with legacy Fairchild designs.

Technical Context

This device implements a planar epitaxial PNP structure optimized for high-voltage linearity and stable h_FE across collector currents from −0.1 mA to −50 mA. Its BVCBO of −160 V enables use in flyback snubbers and relay drivers where base-collector reverse stress exceeds standard logic-level transistors.

Thermal design relies on FR-4 PCB mounting per JEDEC TO-236 land pattern; derating begins above 25°C at 2.8 mW/°C, supporting continuous operation up to +125°C ambient when power dissipation remains ≤200 mW. Cob = 6.0 pF at V_CB = −10 V supports RF-coupled amplifier stages up to 100 MHz.

Key Specifications

Pinout & Package

SOT-23 (JEDEC TO-236AB) package with gull-wing leads, 1.30 mm × 2.92 mm footprint, 1.20 mm max height, and 0.95 mm lead pitch. Designed for reflow soldering on standard FR-4 PCBs with recommended land pattern per MA03DREV10.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT5401LT1G, MMBT5401-D87Z offers larger reel quantity for production efficiency without electrical trade-offs; versus PN2907A, it provides superior voltage rating and surface-mount compatibility but requires SMT infrastructure investment.

Availability

MMBT5401-D87Z is available at Aetrix Electronics and suitable for switch-mode power supply feedback, high-voltage relay driver, and audio signal amplifier applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across manufacturing lots.

Supply support for MMBT5401-D87Z 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 (Semiconductor Components Industries, LLC) is a global supplier of energy-efficient semiconductor components headquartered in Phoenix, Arizona, serving automotive, industrial, cloud computing, and consumer markets.

The MMBT5401-D87Z belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered for cost-sensitive, high-reliability discrete switching and amplification in power management and signal conditioning circuits.

FAQ

What is the maximum continuous collector current rating for MMBT5401-D87Z?

The MMBT5401-D87Z has an absolute maximum continuous collector current (I_C) of −600 mA at T_A = 25°C. Derating applies above 25°C at 2.8 mW/°C, and actual usable current depends on PCB copper area, ambient temperature, and duty cycle. For sustained operation above 100 mA, thermal simulation using R_θJA = 357°C/W is recommended. The MMBT5401-D87Z must not exceed this limit to prevent junction overheating or parametric shift.

Does MMBT5401-D87Z support high-frequency amplification up to 200 MHz?

Yes, the MMBT5401-D87Z specifies f_T = 100–300 MHz under test conditions (I_C = −10 mA, V_CE = −10 V, f = 100 MHz), confirming usability in VHF amplifiers and RF oscillator buffers. However, gain compression and phase distortion increase above 150 MHz due to Cob = 6.0 pF limiting bandwidth in common-emitter configurations. For stable 200 MHz operation, the MMBT5401-D87Z requires careful impedance matching and bypassing per Figure 7 in the datasheet.

How does the MMBT5401-D87Z pinout compare to standard SOT-23 PNP transistors?

The MMBT5401-D87Z uses standard SOT-23 pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector - matching JEDEC TO-236AB and industry conventions for PNP devices like BC807 or NSS60101. This allows direct substitution in layouts designed for Fairchild MMBT5401 variants. No adapter or footprint modification is needed, and the MMBT5401-D87Z maintains identical thermal and electrical behavior under identical PCB land patterns.

Can MMBT5401-D87Z replace older 2N5401 transistors in through-hole designs?

No, the MMBT5401-D87Z is a surface-mount SOT-23 device and cannot physically replace through-hole 2N5401 (TO-92) without PCB redesign. While its electrical specs (V_CEO, h_FE, f_T) overlap significantly, the package change eliminates mechanical compatibility. For drop-in replacement, use ON Semiconductor's PZT5401 (SOT-223) or consult Aetrix for verified TO-92 alternatives with matched parameters. The MMBT5401-D87Z is intended for new SMT designs only.

What is the typical noise figure of MMBT5401-D87Z and where is it specified?

The MMBT5401-D87Z has a typical noise figure (NF) of 8.0 dB measured at I_C = −250 μA, V_CE = −5.0 V, R_S = 1.0 kΩ, and frequency range 10 Hz to 15.7 kHz - per Table 1 in the official datasheet. This value validates its use in low-level audio preamplifiers and sensor front-ends where signal-to-noise ratio is critical. Since NF varies with bias point, designers should verify performance at their specific operating current using the MMBT5401-D87Z's noise spectral density curves in Figure 5.