NXP Semiconductors BSP304A,126

Overview

BSP304A,126 from Nexperia (formerly Philips Semiconductors) is a P-channel enhancement-mode vertical D-MOS transistor in a TO-92 variant package, rated for −300 V drain-source voltage, −170 mA DC drain current, and 17 Ω R_DS(on) at V_GS = −10 V. It serves as a high-speed line current interruptor in telephone sets and relay drivers.

For engineers reviewing the BSP304A,126 datasheet, BSP304A,126 pinout, BSP304A,126 application, or BSP304A,126 equivalent, key selection factors include gate-threshold voltage (−1.7 to −2.55 V), low gate charge enabling TTL/C-MOS direct drive, absence of secondary breakdown, and thermal resistance of 125 K/W under PCB-mounted conditions.

Technical Context

This device operates as a normally-off P-channel power switch with vertical D-MOS architecture optimized for high-voltage line interruption. Its gate-threshold voltage range (−1.7 to −2.55 V) ensures reliable turn-on with standard logic-level drive, while the absence of secondary breakdown allows safe operation under inductive load switching.

It delivers 100 mS forward transfer admittance at −25 V V_DS, supports peak drain currents up to −0.75 A, and exhibits input capacitance (C_iss) of 60–90 pF - enabling nanosecond-scale switching (t_on = 5–10 ns, t_off = 15–30 ns) in line transformer and relay driver topologies.

Key Specifications

Pinout & Package

Package: TO-92 variant (3-lead plastic, lead spacing 2.54 mm, body height ≤ 4.8 mm, drain pad ≥ 1 cm² required per datasheet note).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar P-channel high-voltage switching applications.

Compared with BSP304,126 and ZVP3306A, the BSP304A,126 uniquely balances −300 V capability with logic-compatible gate drive and TO-92 mountability - making it irreplaceable in legacy telecom line interface designs requiring both high breakdown voltage and direct TTL interfacing.

Availability

BSP304A,126 is available at Aetrix Electronics and suitable for telephone line interface, relay driver, and high-speed line transformer applications requiring stable component supply across long-lifecycle telecom infrastructure programs.

Supply support for BSP304A,126 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 delivering high-performance, reliable discrete, logic, and MOSFET solutions with leadership in efficiency and miniaturization.

The BSP304A,126 belongs to Nexperia's legacy high-voltage P-channel D-MOS family, engineered specifically for telecom line interface and industrial control applications demanding robustness at −300 V with direct logic compatibility.

FAQ

What is the gate-source threshold voltage range for BSP304A,126?

The BSP304A,126 has a gate-source threshold voltage (V_GS(th)) range of −1.7 V to −2.55 V, measured at I_D = −1 mA and V_DS = V_GS. This ensures reliable turn-on with standard 3.3 V or 5 V logic outputs and supports stable operation across temperature variations, as confirmed in the Philips/Nexperia product specification.

Is BSP304A,126 pin-compatible with BSP304,126?

No - BSP304A,126 uses a 1-S/2-G/3-D pinout, whereas BSP304,126 uses 1-G/2-D/3-S. Though electrically identical, they are not pin-compatible. Using BSP304A,126 in a design laid out for BSP304,126 will result in incorrect gate/drain/source connections and functional failure unless the PCB is revised.

What is the maximum continuous drain current for BSP304A,126?

The BSP304A,126 supports a maximum continuous DC drain current (I_D) of −170 mA at T_amb = 25 °C with proper PCB thermal management (≥1 cm² drain pad). Derating applies above 25 °C per the published power derating curve, and peak current capability reaches −0.75 A for short pulses.

Does BSP304A,126 require external gate protection?

Yes - the BSP304A,126 gate is sensitive to electrostatic discharge. The datasheet explicitly cautions that the gate-source input must be protected against static discharge during transport or handling. A series gate resistor (e.g., 100 Ω) and/or TVS diode is recommended in production designs to prevent latch-up or oxide damage.

Can BSP304A,126 be used in place of an N-channel MOSFET in high-side switching?

Yes - as a P-channel device, BSP304A,126 is inherently suited for high-side switching configurations where the source connects to the positive rail. Its −300 V V_DS rating and logic-compatible V_GS(th) make it appropriate for high-voltage high-side line interruption, unlike most N-channel devices which require gate-boost circuitry to achieve similar functionality.