Nexperia USA Inc. PMBT3904QAZ

Overview

PMBT3904QAZ from Nexperia is an NPN general-purpose switching transistor in a DFN1010D-3 (SOT1215) leadless package, rated for 40 V V_CEO, 200 mA I_C, and DC current gain (h_FE) of 100–300 at I_C = 10 mA. It delivers low saturation voltages (V_CE(sat) = 750 mV max at I_C/I_B = 10), fast switching (t_on ≤ 70 ns), and operates across –55 °C to 150 °C ambient. Used in compact load switching and signal amplification in space-constrained consumer and industrial PCBs.

For engineers reviewing the PMBT3904QAZ datasheet, PMBT3904QAZ pinout, PMBT3904QAZ application, or PMBT3904QAZ equivalent, this page provides verified package dimensions, thermal derating curves, AOI-compatible solder joint validation, and direct substitution guidance against industry-standard SOT23-3 NPN transistors with matching gain and voltage ratings.

Technical Context

This device implements a planar epitaxial NPN silicon transistor structure optimized for high-speed digital switching and linear amplification. Its DFN1010D-3 package features visible side pads for automated optical inspection and achieves thermal resistance R_th(j-a) of 285 K/W on 4-layer FR4 PCBs-matching SOT23 power dissipation despite 0.37 mm height.

Electrical behavior is defined by tight h_FE distribution (100–300 at V_CE = 1 V, I_C = 10 mA), low leakage (I_CBO ≤ 50 nA), and stable f_T = 300 MHz, enabling reliable operation in 1–10 MHz digital logic interfaces and low-noise pre-amplifier stages.

Key Specifications

Pinout & Package

DFN1010D-3 (SOT1215) is a 3-terminal, leadless, thermally enhanced ultra-thin plastic package measuring 1.1 mm × 1.0 mm × 0.37 mm with 0.75 mm pitch and visible side pads for AOI and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PMBT3904,115, PMBT3904QAZ saves >70% board area with identical electrical specs; versus BC846BW, it trades gain linearity for 2× current capacity and proven robustness in repetitive switching duty cycles.

Availability

PMBT3904QAZ is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, load switching for peripherals, and signal amplifier stages requiring stable component supply across high-mix, low-volume production runs.

Supply support for PMBT3904QAZ 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 devices, with leadership in automotive-qualified and industrial-grade components.

This part belongs to Nexperia's PMB series of general-purpose bipolar transistors designed specifically for space-constrained, cost-sensitive switching and amplification in consumer, computing, and industrial electronics.

FAQ

What is the maximum allowable junction temperature for PMBT3904QAZ?

The absolute maximum junction temperature (T_j) is 150 °C, validated per IEC 60134 limiting values. Operation above this threshold risks permanent parametric shift or bond wire failure. Derating begins at T_amb > 25 °C per Fig. 2, with full 440 mW power dissipation permitted only on 4-layer FR4 PCBs.

Can PMBT3904QAZ be used in place of a standard SOT23-3 transistor?

Yes-electrically identical to PMBT3904,115 with same V_CEO, I_C, h_FE, and switching speed. However, its DFN1010D-3 footprint requires updated stencil and placement files; solder paste volume must be reduced by 40% versus SOT23 due to smaller pad area and no leads.

Is PMBT3904QAZ suitable for automotive applications?

No-this device is not AEC-Q101 qualified. Nexperia explicitly states in Section 15 that non-automotive qualified products lack testing per automotive reliability standards. Use only in consumer, industrial, or computing applications where safety-critical operation is not required.

What reflow profile should be used for PMBT3904QAZ?

Per Section 13, only Pb-free reflow per J-STD-020 is validated. Peak temperature must not exceed 260 °C, with time above liquidus (TAL) between 60–150 seconds. Thermal profile must avoid thermal shock-ramp rates ≤ 3 °C/s pre-liquidus and ≤ 6 °C/s post-liquidus are mandatory to prevent pad lifting or voiding.