Nexperia USA Inc. PMSTA92-QX

Overview

PMSTA92-QX from Nexperia is a PNP high-voltage bipolar junction transistor in SOT323 (SC-70) package, rated for V_CEO = −300 V, I_C = −100 mA, and h_FE ≥ 30 at −30 mA/−10 V. It serves as a high-voltage switching or amplification element in telephony line interface circuits, automotive signal conditioning, and professional communication equipment power stages.

For engineers reviewing the PMSTA92-QX datasheet, PMSTA92-QX pinout, PMSTA92-QX application, or PMSTA92-QX equivalent, key selection criteria include verified −300 V collector-emitter breakdown, AEC-Q101 qualification, SC-70 thermal resistance of 625 K/W, and confirmed PNP polarity with base-emitter saturation voltage ≤ −900 mV under pulsed conditions.

Technical Context

This discrete PNP transistor operates in linear or saturated switching mode with guaranteed DC current gain ≥30 at −30 mA collector current and −10 V V_CE. Its absolute maximum ratings include −300 V V_CBO and −300 V V_CEO, enabling use in high-side switching and off-hook detection circuits where sustained reverse bias tolerance is required.

Thermal performance is defined for FR4 PCB mounting: R_th(j-a) = 625 K/W, with junction temperature limited to 150 °C. Capacitance parameters-C_c = 1.9–3.5 pF at −20 V and C_e = 20 pF at −5 V-support stable operation in RF-coupled telephony interfaces up to 50 MHz f_T.

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, tin-plated terminations compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-voltage transistor applications.

Compared with PMSTA42-Q and MMBT92A, PMSTA92-QX uniquely combines AEC-Q101 qualification, −300 V rating, and PNP polarity in SOT323-enabling drop-in replacement in automotive telephony modules without redesigning bias networks or derating margins.

Availability

PMSTA92-QX is available at Aetrix Electronics and suitable for telephony line interface, automotive door module control, and industrial power supply sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PMSTA92-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 efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

PMSTA92-QX belongs to Nexperia's AEC-Q101-qualified high-voltage bipolar transistor product line, engineered specifically for robust signal switching and line interface functions in harsh electrical environments.

FAQ

Is PMSTA92-QX pin-compatible with PMSTA42-Q?

No. PMSTA92-QX is a PNP transistor with pinout Base–Emitter–Collector (1–2–3), while PMSTA42-Q is its NPN complement with identical physical pinout but reversed polarity and current flow direction. Swapping them without circuit revision causes functional failure.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current is −100 mA per datasheet limiting values, but continuous operation must stay within I_B ≤ −2 mA to maintain V_CE(sat) ≤ −250 mV at I_C = −20 mA. Exceeding this risks thermal runaway due to SOT323's 200 mW P_tot limit.

Does PMSTA92-QX require heatsinking in typical telephony applications?

No. With R_th(j-a) = 625 K/W and typical I_C ≤ −30 mA at V_CE ≈ −1 V, power dissipation remains below 30 mW-well within the 200 mW P_tot rating even at 85 °C ambient. Standard FR4 mounting suffices.

Can PMSTA92-QX be used in linear amplifier configurations?

Yes, but only in Class-A or low-distortion small-signal stages. Its h_FE variation (30–100) and f_T = 50 MHz limit bandwidth and gain stability; it is optimized for switching, not precision amplification. Bias networks must ensure V_CE > −5 V to avoid saturation distortion.