Nexperia USA Inc. PMBT3946VPN,115

Overview

PMBT3946VPN from Nexperia is a dual NPN/PNP general-purpose switching transistor in a single SOT666 package, delivering 40 V V_CEO, 200 mA I_C, and matched h_FE (100–300) for both transistors at 10 mA. It serves as a compact, board-space-saving discrete pair for complementary switching in low-voltage logic interfaces, level translation, and small-signal amplification in portable power management circuits.

For engineers reviewing the PMBT3946VPN datasheet, PMBT3946VPN pinout, PMBT3946VPN application, or PMBT3946VPN equivalent, this device supports fast switching (t_off ≤ 250 ns for NPN, ≤ 300 ns for PNP), ultra-low leakage (I_CBO ≤ ±50 nA), and thermal robustness (T_j = 150 °C) - critical for space-constrained consumer and industrial control designs.

Technical Context

This dual transistor integrates electrically isolated NPN (TR1) and PNP (TR2) devices sharing no internal connection - each with independent base-emitter-collector terminals. Both transistors operate under identical absolute maximum ratings (V_CEO = ±40 V, I_C = ±200 mA) and exhibit symmetric DC gain (h_FE = 100–300 at V_CE = ±1 V, I_C = ±10 mA) and saturation behavior (V_CEsat ≤ 300 mV / –400 mV).

Switching performance is characterized using standardized test circuits (Figs. 13–14): TR1 uses V_CC = +3 V and TR2 uses V_CC = –3 V, with matched R_B = 3.9 kΩ and R_C = 270 Ω, enabling direct comparison of turn-on/turn-off timing (t_on ≤ 70 ns, t_off ≤ 300 ns) across polarities under identical drive conditions.

Key Specifications

Pinout & Package

SOT666 is a 6-pin, ultra-small flat-lead surface-mount plastic package measuring 1.6 mm × 1.2 mm × 0.55 mm with 0.5 mm pitch. Its low-profile design supports automated placement and reflow soldering only - no hand-soldering or wave soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PMBT3946VPN, PMBT3904VS and PMBT3906VS offer polarity-specific duplication but lack cross-polarity functionality - making them viable only in unidirectional designs, whereas PMBT3946VPN enables true complementary operation within one footprint.

Availability

PMBT3946VPN is available at Aetrix Electronics and suitable for LED driver circuits, logic-level translators, load switch controllers, and small-signal amplifier stages requiring stable component supply, consistent parametric matching, and long-term obsolescence mitigation.

Supply support for PMBT3946VPN 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 discrete and logic components, with leadership in automotive-qualified and industrial-grade power management solutions.

The PMBT3946VPN belongs to Nexperia's general-purpose bipolar transistor family, engineered specifically for space-constrained consumer, computing, and industrial applications demanding matched dual-transistor performance in ultra-small packages.

FAQ

What is the maximum operating temperature for PMBT3946VPN?

The PMBT3946VPN has a maximum junction temperature (T_j) of 150 °C and an ambient operating range of –55 °C to +150 °C. Its thermal resistance (R_th(j-a) = 347 K/W on FR4) allows full 360 mW dissipation up to 75 °C ambient without derating - verified per IEC 60134 limiting values.

Can PMBT3946VPN be used in linear amplifier configurations?

Yes - both transistors support linear operation with specified f_T (300 MHz for NPN, 250 MHz for PNP), noise figure (≤5 dB), and h_FE linearity across I_C = 0.1–100 mA. However, its primary design focus is switching; for precision analog use, dedicated RF or low-noise transistors are recommended.

Is reflow soldering mandatory for PMBT3946VPN?

Yes - the datasheet explicitly states "Reflow soldering is the only recommended soldering method" due to the SOT666 package's fine pitch (0.5 mm) and thermal sensitivity. Wave soldering or hand-soldering risks lead damage, delamination, or parametric shift and voids warranty compliance.

How does PMBT3946VPN differ from PMBT3904/3906 discrete singles?

Unlike individual PMBT3904 (NPN) or PMBT3906 (PNP) SOT23 devices, the PMBT3946VPN integrates matched NPN+PNP pairs in SOT666 - reducing PCB area by >60%, eliminating inter-device h_FE mismatch, and guaranteeing thermal coupling. It is not pin-compatible with SOT23 footprints.