Nexperia USA Inc. PMST3906,115

Overview

PMST3906,115 from Nexperia is a PNP bipolar junction transistor optimized for low-power switching and amplification in space-constrained applications. It delivers V_CEO = −40 V, I_C = −200 mA, h_FE = 100–300 (at I_C = −10 mA), V_CE(sat) ≤ −400 mV (at I_C = −50 mA / I_B = −5 mA), and is housed in an AEC-Q101-qualified SOT323 (SC-70) package. It serves as the PNP complement to PMST3904 in discrete logic-level interface and automotive body-control modules.

For engineers reviewing the PMST3906,115 datasheet, PMST3906,115 pinout, PMST3906,115 application, or PMST3906,115 equivalent, key selection criteria include its guaranteed h_FE range at low I_C, fast switching performance (t_on ≤ 70 ns, t_off ≤ 300 ns), AEC-Q101 qualification, thermal resistance (R_th(j-a) = 625 K/W on FR4), and SC-70 footprint compatibility with high-density PCB layouts.

Technical Context

The PMST3906,115 operates as a standard PNP BJT with base-controlled current amplification. Its DC current gain (h_FE) varies from 60 to 300 across I_C = −0.1 mA to −100 mA at V_CE = −1 V, with strong temperature stability (−55 °C to +150 °C). Saturation behavior is characterized by V_CE(sat) ≤ −850 mV at I_C = −10 mA / I_B = −1 mA and ≤ −400 mV at higher drive conditions.

Switching is defined by measured delay (t_d ≤ 35 ns), rise (t_r ≤ 35 ns), storage (t_s ≤ 225 ns), and fall (t_f ≤ 75 ns) times under standardized test conditions (V_I = 5 V, R_B = 3.9 kΩ, R_C = 270 Ω). Its f_T = 250 MHz confirms suitability for RF-coupled bias networks and medium-speed digital switching up to ~50 MHz.

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, 3-terminal configuration with gull-wing leads. Designed for reflow soldering per IPC-J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT3906LT1G and DXT3906-7-F, the PMST3906,115 uniquely combines AEC-Q101 qualification, guaranteed h_FE ≥100 at low current, and the smallest SC-70 footprint-making it optimal for automotive and portable designs demanding reliability, predictability, and miniaturization.

Availability

PMST3906,115 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, portable medical devices, and consumer IoT power management requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for PMST3906,115 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 high-volume, high-reliability essential semiconductors-including logic, discretes, MOSFETs, and ESD protection-designed for efficiency, miniaturization, and robustness.

The PMST3906,115 belongs to Nexperia's automotive-qualified general-purpose transistor product line, engineered specifically for space-constrained switching and amplification in harsh-environment applications where reliability and small form factor are critical.

FAQ

Is PMST3906,115 pin-compatible with PMST3904?

No-PMST3906,115 is a PNP transistor with pinout Base–Emitter–Collector (1–2–3), while PMST3904 is its NPN complement with identical SOT323 package but reversed polarity and complementary pin function. They share footprint and mounting, but circuit placement and biasing differ fundamentally.

What is the maximum allowable PCB temperature rise when operating at I_C = −150 mA?

At I_C = −150 mA and V_CE(sat) ≈ −650 mV (interpolated from Fig.5), power dissipation is ~97.5 mW. With R_th(j-a) = 625 K/W, junction temperature rise is ~61 K above ambient. For T_j ≤ 150 °C, ambient must remain ≤ 89 °C-requiring derating above 70 °C ambient per Nexperia's thermal guidelines.

Can PMST3906,115 be used in linear amplifier configurations?

Yes-it supports linear operation with V_CE > V_CE(sat) and controlled I_C. Its h_FE variation (60–300) and f_T = 250 MHz allow audio-frequency amplification (e.g., microphone preamp stages), but thermal stability and gain linearity require careful bias network design and layout to minimize self-heating effects.

Does the %2A marking code indicate RoHS compliance?

Yes-the "%" placeholder denotes Nexperia's manufacturing site code, and "2A" is the device-specific identifier. All PMST3906,115 units shipped post-2010 comply with RoHS Directive 2011/65/EU and REACH SVHC regulations, as confirmed in Nexperia's material declarations and product change notices.