Nexperia USA Inc. PMBT3904,215

Overview

PMBT3904,215 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-power switching circuits in automotive body control modules.

For engineers reviewing the PMBT3904,215 datasheet, PMBT3904,215 pinout, PMBT3904,215 application, or PMBT3904,215 equivalent, key selection considerations include its AEC-Q101 qualification, SOT23 thermal resistance (R_th(j-a) = 500 K/W), switching speed (t_f ≤ 50 ns), and complementary PNP pairing with PMBT3906,215.

Technical Context

The PMBT3904,215 operates as a silicon-based NPN BJT optimized for linear amplification and saturated switching in low-voltage, low-current applications. Its design supports base-driven operation with V_BE(sat) ≤ 950 mV at I_C/I_B = 10 and f_T = 300 MHz, enabling reliable signal conditioning and digital logic interfacing.

Thermal performance is defined for FR4 PCB mounting with single-sided copper, delivering 250 mW P_tot at T_amb ≤ 25 °C and junction temperature up to 150 °C. The device exhibits low leakage (I_CBO ≤ 50 nA at V_CB = 30 V) and stable h_FE across −55 °C to +150 °C ambient range.

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; designed for reflow and wave soldering per IPC-7351 standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC846B,215 and PMBT3904H,215, the PMBT3904,215 provides optimal balance of automotive qualification, proven thermal performance on FR4, and cost-effective SOT23 integration-making it preferred for volume automotive electronics where qualification and consistency are jointly mandated.

Availability

PMBT3904,215 is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor interfaces, and IoT edge node switching requiring stable component supply, full traceability, and lifecycle continuity.

Supply support for PMBT3904,215 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 discrete and logic devices for automotive, industrial, and consumer markets.

The PMBT3904,215 belongs to Nexperia's AEC-Q101-qualified general-purpose transistor portfolio, engineered for robustness in automotive electronics and compatibility with automated SMT assembly processes.

FAQ

Is PMBT3904,215 suitable for automotive applications?

Yes. The PMBT3904,215 is fully AEC-Q101 qualified per the official Nexperia product data sheet dated 16 February 2024, with validation across temperature cycling, mechanical shock, and humidity testing. It is approved for use in automotive body electronics, lighting controls, and infotainment subsystems.

What is the maximum allowable power dissipation at 85 °C ambient?

At T_amb = 85 °C, derated power dissipation is 150 mW, calculated using R_th(j-a) = 500 K/W and T_j(max) = 150 °C: P_tot = (T_j(max) − T_amb) / R_th(j-a) = (150 − 85) / 500 = 0.13 W. This aligns with Nexperia's thermal derating curve in Section 9 of the datasheet.

Can PMBT3904,215 replace BC847 in existing designs?

Yes, with verification. Both are SOT23 NPN transistors, but PMBT3904,215 has lower V_CEO (40 V vs. 45 V), similar h_FE range, and AEC-Q101 qualification absent in BC847. Designers must confirm that 40 V V_CEO meets system voltage margin requirements and validate switching timing under actual load conditions.

What is the base-emitter voltage at I_C = 10 mA and T_amb = 25 °C?

Per Figure 3 in the datasheet, V_BE is approximately 700 mV at I_C = 10 mA and T_amb = 25 °C. This value is consistent across the typical operating range and supports reliable TTL-level base drive without additional level-shifting circuitry.