Nexperia USA Inc. PMBT4403Z

Overview

PMBT4403Z from Nexperia is a PNP bipolar junction transistor optimized for general-purpose switching in low-voltage, medium-current applications. It delivers V_CEO = −40 V, I_C = −600 mA, h_FE = 100–300 at −150 mA/−2 V, and operates reliably across −65 °C to +150 °C ambient. It is commonly used in power rail control, LED driver stages, and logic-level signal inversion circuits.

For engineers reviewing the PMBT4403Z datasheet, PMBT4403Z pinout, PMBT4403Z application, or PMBT4403Z equivalent, key selection criteria include its SOT23 package footprint compatibility, guaranteed −40 V breakdown rating, low V_CEsat (≤ −750 mV at −500 mA/−50 mA), fast turn-off time (≤ 350 ns), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

The PMBT4403Z is a silicon PNP BJT with fixed emitter-base and collector-base junctions, designed for saturated switching rather than linear amplification. Its DC current gain (h_FE) exhibits strong temperature dependence-ranging from ~60 at −55 °C to ~200 at +150 °C under −2 V/−150 mA conditions-and supports stable operation up to 150 °C junction temperature.

Switching performance is defined by discrete timing parameters: t_on ≤ 40 ns, t_off ≤ 350 ns, and storage time t_s ≤ 300 ns under standardized test conditions (I_Bon = −15 mA, I_Boff = +15 mA). Thermal resistance R_th(j-a) is 500 K/W on FR4 PCB, requiring derating above 25 °C ambient per Fig. 1.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch); thermally optimized for single-sided FR4 PCBs with standard reflow footprint per Fig. 12.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT4403, PMBT4403Z offers identical switching performance and qualification but differs in traceability and logistics chain; versus PZT4403, it trades thermal headroom for compactness and assembly compatibility-critical for space-constrained consumer electronics.

Availability

PMBT4403Z is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC output stages, USB-C power path switching, and consumer appliance motor driver applications requiring stable component supply across multi-year production cycles.

Supply support for PMBT4403Z 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, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.

The PMBT4403Z belongs to Nexperia's general-purpose bipolar transistor product line, engineered for robust switching in cost-sensitive, high-volume applications where AEC-Q101 compliance and SOT23 manufacturability are mandatory.

FAQ

Is PMBT4403Z pin-compatible with PMBT4401?

No-PMBT4403Z is a PNP transistor with pinout Base–Emitter–Collector (1–2–3), while PMBT4401 is its NPN complement with pinout Emitter–Base–Collector (1–2–3) in the same SOT23 package. Swapping them without circuit redesign will result in non-functional or damaged operation due to reversed polarity and current flow direction.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current is −200 mA (single pulse, t_p ≤ 1 ms), but for continuous DC operation, base current must be limited to ensure junction temperature stays ≤150 °C. At I_C = −500 mA and h_FE = 100, I_B ≈ −5 mA is sufficient; exceeding −15 mA continuously risks thermal runaway without heatsinking.

Does PMBT4403Z support linear amplification applications?

Yes-it is specified for both switching and linear amplification per its datasheet, with h_FE characterized from −0.1 mA to −500 mA and V_CE down to −0.2 V. However, its primary design focus and characterization emphasis are on saturated switching; for precision analog amplification, dedicated low-noise or matched-pair BJTs are recommended.

How does the −5 V V_EBO rating impact circuit design?

The −5 V emitter-base breakdown voltage means the base must never be driven more than 5 V below the emitter potential-e.g., in high-side switch configurations with emitter at 12 V, base must stay ≥7 V to avoid reverse-bias damage. This constrains pull-down resistor values and logic interface choices when driving from 3.3 V or 5 V microcontrollers.