Nexperia USA Inc. PMMT591A,215

Overview

PMMT591A from Nexperia is a PNP BISS (Breakthrough In Small Signal) transistor in SOT23 package, designed for high-current switching with low V_CE(sat). It delivers 1 A DC collector current, −40 V V_CEO, and −500 mV V_CE(sat) at I_C = −1 A / I_B = −100 mA, enabling efficient power control in portable battery-powered systems.

For engineers reviewing the PMMT591A datasheet, PMMT591A pinout, PMMT591A application, or PMMT591A equivalent, key selection criteria include its PNP polarity, SOT23 footprint compatibility, guaranteed h_FE ≥ 160 at 1 A, low saturation voltage for minimal conduction loss, and thermal resistance of 500 K/W on FR4 PCB.

Technical Context

This PNP BISS transistor uses optimized epitaxial base design to achieve high current gain and low saturation voltage simultaneously. Its h_FE remains ≥250 at I_C = −500 mA and ≥160 at full 1 A rating, supporting robust switching across wide temperature range (−65 °C to +150 °C).

It operates with V_EB ≤ −1.1 V at I_C = −1 A and exhibits C_c = 12 pF at V_CB = −10 V, f = 1 MHz, making it suitable for medium-speed digital switching and analog amplification up to 150 MHz f_T.

Key Specifications

Pinout & Package

SOT23 plastic surface-mounted package (TO-236AB), 3-lead, 1.3 mm × 2.9 mm footprint, 1.1 mm height, compatible with standard pick-and-place and reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PMMT591A, PMST591A trades thermal performance for miniaturization, while ZTX951 offers higher voltage headroom and discrete heatsinking at the cost of assembly automation compatibility and board area efficiency.

Availability

PMMT591A is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial sensor interfaces, automotive body electronics, and portable consumer devices requiring stable component supply and long-term manufacturability.

Supply support for PMMT591A 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 leader in high-volume production of discrete semiconductors, logic ICs, and PowerMOS devices, headquartered in Nijmegen, Netherlands.

The PNP BISS transistor product line targets high-efficiency, space-constrained switching applications in automotive, industrial, and portable electronics-emphasizing low saturation voltage and high current density in miniature packages.

FAQ

Is PMMT591A pin-compatible with standard SOT23 PNP transistors like BC807?

No. PMMT591A follows the SOT23 pinout: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. BC807 uses Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. Swapping them causes circuit failure due to reversed polarity and incorrect terminal assignment.

What is the maximum continuous power dissipation at 85 °C ambient?

At T_amb = 85 °C, derated power is calculated as P_tot = (T_j(max) − T_amb) / R_th(j-a) = (150 − 85) / 500 = 130 mW. This limits usable I_C to ~650 mA at V_CE(sat) ≈ −400 mV to stay within safe thermal margin.

Does PMMT591A require a base resistor when driven by a 3.3 V microcontroller GPIO?

Yes. With V_BE(sat) ≈ −1.1 V and required I_B = −100 mA for 1 A I_C, a 22 Ω resistor (3.3 V − (−1.1 V)) / 0.1 A = 44 Ω max; 22 Ω ensures sufficient overdrive and accounts for V_OL of GPIO.

Can PMMT591A replace an NPN transistor in an existing circuit?

No-it is a PNP device and cannot substitute for NPN without inverting the control logic and power topology. Its complement is PMMT491A (NPN). Direct replacement would reverse current flow direction and likely damage the circuit or prevent proper switching.