Nexperia USA Inc. PMST2907A-QX

Overview

PMST2907A-QX from Nexperia is a PNP bipolar junction transistor optimized for automotive-grade switching in space-constrained PCB layouts, featuring −60 V V_CEO, −600 mA I_C, DC current gain (h_FE) of 100–300 at −150 mA, and AEC-Q101 qualification. It operates as a high-reliability load switch in low-voltage control circuits such as body electronics and lighting drivers.

For engineers reviewing the PMST2907A-QX datasheet, PMST2907A-QX pinout, PMST2907A-QX application, or PMST2907A-QX equivalent, key selection criteria include its SOT323 package footprint, −1.6 V V_CE(sat) at −500 mA/−50 mA drive, thermal resistance of 625 K/W on FR4, and guaranteed performance across −55 °C to +150 °C ambient.

Technical Context

This PNP transistor uses epitaxial planar technology with a base-emitter junction designed for stable DC gain over temperature and pulse operation (t_p ≤ 300 µs, duty δ ≤ 0.02). Its switching behavior is characterized by t_on = 45 ns and t_off = 300 ns under defined test conditions (I_Bon = −15 mA, I_Boff = +15 mA).

The device's absolute maximum ratings are defined per IEC 60134, including −60 V V_CBO and V_CEO, −5 V V_EBO, and 200 mW P_tot at T_amb ≤ 25 °C on standard FR4. Power derating follows a linear curve down to zero at 175 °C junction temperature.

Key Specifications

Pinout & Package

SOT323 (SC-70) plastic surface-mount package: 2.0 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, single-sided copper FR4 mounting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP switching transistor applications.

Compared with BC807-40-Q and MMBT2907A, PMST2907A-QX provides the optimal balance of automotive qualification, 60 V blocking, and predictable saturation behavior-making it the preferred choice for production-grade 12 V/24 V body electronics where reliability and supply-chain continuity are mandatory.

Availability

PMST2907A-QX is available at Aetrix Electronics and suitable for automotive body control modules, LED lighting drivers, engine control unit fan interfaces, and industrial sensor interface boards requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for PMST2907A-QX 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 focused on essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

PMST2907A-QX belongs to Nexperia's AEC-Q101-qualified discrete transistor portfolio, engineered specifically for robust, high-volume automotive switching applications where space, thermal performance, and qualification compliance are critical.

FAQ

Is PMST2907A-QX pin-compatible with standard SOT323 PNP transistors like BC807-40?

Yes, PMST2907A-QX uses the standard SC-70 (SOT323) pinout: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. This matches BC807-40, MMBT2907A, and other SOT323-packaged PNP transistors, enabling direct PCB footprint reuse. However, electrical parameters-including V_CEO, h_FE range, and AEC-Q101 status-differ and must be verified per application.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current is −200 mA (single pulse, t_p ≤ 1 ms), but for continuous DC operation, the recommended limit is derived from power dissipation: with P_tot = 200 mW and V_BE(sat) ≈ −2.6 V at high drive, I_B should remain below −77 mA to avoid exceeding thermal limits on FR4. Typical designs use −15 mA to −50 mA for reliable saturation.

Does PMST2907A-QX require an external flyback diode when switching inductive loads?

While the transistor itself does not integrate a flyback diode, its −60 V V_CEO rating allows it to withstand typical automotive inductive kickback (up to ~40 V) without clamping-especially when used with appropriate RC snubbers or controlled PWM slew rates. For high-energy loads (e.g., large solenoids), an external diode remains recommended to ensure long-term reliability and reduce stress on the B-C junction.

Can PMST2907A-QX operate in linear amplification mode?

Yes-its datasheet specifies h_FE, V_BE, and V_CE(sat) across multiple bias points, and Figure 3 shows h_FE vs. I_C from −0.1 mA to −500 mA. However, linear operation is limited by P_tot = 200 mW and thermal resistance (625 K/W); sustained dissipation above ~100 mW requires careful heatsinking or derating, especially above 75 °C ambient.