Nexperia USA Inc. PMBT3904,235

Overview

PMBT3904,235 from Nexperia is a general-purpose NPN bipolar junction transistor in SOT23 package, rated for 40 V V_CEO, 200 mA I_C, and AEC-Q101 qualified for automotive use; it delivers DC current gain (h_FE) of 100–300 at I_C = 10 mA and V_CE = 1 V, with V_CE(sat) ≤ 850 mV at I_C = 10 mA/I_B = 1 mA, commonly used in low-voltage logic-level switching and signal amplification circuits.

For engineers reviewing the PMBT3904,235 datasheet, PMBT3904,235 pinout, PMBT3904,235 application, or PMBT3904,235 equivalent, key selection criteria include its AEC-Q101 qualification, SOT23 thermal resistance (R_th(j-a) = 500 K/W), switching speed (t_f ≤ 50 ns), and complementary pairing with PMBT3906.

Technical Context

This discrete NPN transistor operates as a voltage-controlled current amplifier with base-emitter forward bias enabling collector current control up to 200 mA. Its V_CEO = 40 V and V_CBO = 60 V support reliable operation in 24 V automotive and industrial supply rails.

Switching performance is defined by t_d/t_r/t_s/t_f ≤ 35/35/200/50 ns under standard test conditions (I_Bon = 1 mA, I_Boff = −1 mA), and its f_T = 300 MHz confirms suitability for RF pre-amplifier and high-speed digital interface stages.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body; optimized for automated reflow assembly and space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC846B,215 and MMBT3904-7-F, the PMBT3904,235 offers the optimal balance of AEC-Q101 compliance, proven 40 V/200 mA switching capability, and broad industry adoption - making it the preferred choice for cost-sensitive automotive and industrial designs requiring zero qualification overhead.

Availability

PMBT3904,235 is available at Aetrix Electronics and suitable for automotive door modules, industrial PLC input stages, consumer IoT sensor interfaces, and medical portable device power control requiring stable component supply across multi-year production cycles.

Supply support for PMBT3904,235 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.

The PMBT3904,235 belongs to Nexperia's AEC-Q101-qualified general-purpose transistor product line, engineered specifically for robust, low-cost switching and amplification in harsh-environment electronics where reliability and manufacturability are critical.

FAQ

Is PMBT3904,235 pin-compatible with PMBT3906?

No - PMBT3904,235 is an NPN transistor with pinout Base (1), Emitter (2), Collector (3), while PMBT3906 is its PNP complement with reversed polarity and identical SOT23 mechanical footprint but inverted terminal roles: Emitter (1), Base (2), Collector (3). Direct substitution without circuit redesign will cause functional failure.

What is the maximum allowable PCB trace width for 200 mA continuous current in the SOT23 package?

At 25 °C ambient, the SOT23 package limits continuous I_C to 200 mA only when mounted on FR4 with single-sided 1 oz copper and standard footprint. To sustain 200 mA without exceeding T_j = 150 °C, minimum 0.5 mm wide × 10 mm long copper traces on both collector and emitter pads are required per Nexperia's thermal characterization data.

Does PMBT3904,235 support pulse operation beyond 200 mA?

Yes - the datasheet specifies I_CM = 200 mA as peak collector current under single-pulse conditions (t_p ≤ 1 ms). For pulsed operation, the absolute maximum is governed by energy limit: ∫i²dt ≤ 0.02 A²·s. At 500 mA peak, duty cycle must remain below 8% to avoid junction overheating.

Can PMBT3904,235 be used in linear amplifier configurations?

Yes - its h_FE stability (100–300) and low noise figure (NF = 5 dB at 10 Hz–15.7 kHz) support Class-A audio preamplifier and sensor signal conditioning. However, R_th(j-a) = 500 K/W restricts continuous dissipation to ≤250 mW, limiting usable output swing to <100 mW into 8 Ω loads without thermal derating.