NXP Semiconductors PHP21N06LT,127

Overview

PHP21N06LT from Nexperia is an N-channel TrenchMOS™ logic-level power MOSFET in SOT78 (TO-220AB) package, rated for 55 V V_DSS, 19 A continuous drain current at T_mb = 25 °C, and R_DS(ON) ≤ 75 mΩ at V_GS = 5 V. It serves as a main switching element in DC-DC converters and switched-mode power supplies where low gate drive voltage compatibility and fast switching are required.

For engineers reviewing the PHP21N06LT datasheet, PHP21N06LT pinout, PHP21N06LT application, or PHP21N06LT equivalent, key selection criteria include its logic-level gate threshold (V_GS(TO) = 1.0–2.0 V), avalanche energy rating (E_AS = 34 mJ), thermal resistance (R_{th j-mb} = 2.7 K/W), and body diode reverse recovery performance (t_rr = 43 ns, Q_rr = 94 nC).

Technical Context

This device uses trench-gate technology to achieve low on-resistance and high transconductance (g_fs = 5–13 S). Its gate threshold voltage remains stable across temperature (0.5–2.3 V range), enabling reliable turn-on with 3.3 V or 5 V microcontroller outputs.

The integrated body diode supports synchronous rectification and freewheeling in buck and flyback topologies. Avalanche-rated operation allows unclamped inductive switching up to I_AS = 19 A with t_AV ≤ 100 µs, validated under V_DD ≤ 25 V and R_GS = 50 Ω conditions.

Key Specifications

Pinout & Package

PHP21N06LT is housed in the SOT78 (TO-220AB) plastic package with isolated leads and metal tab connected to drain. The package features three leads and is designed for through-hole mounting with heatsink attachment via the tab.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel logic-level power MOSFET applications.

Compared with STP20NM50FP and IRFZ44NPBF, PHP21N06LT uniquely balances logic-level compatibility, low R_DS(ON) at 5 V, and proven avalanche ruggedness-making it optimal for space-constrained, low-voltage, high-efficiency DC-DC and adapter designs where gate drive headroom is limited.

Availability

PHP21N06LT is available at Aetrix Electronics and suitable for DC-DC converters, switched-mode power supplies, and motor drive circuits requiring stable component supply, long-term manufacturability, and automotive-grade reliability screening.

Supply support for PHP21N06LT 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 leader in discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.

The PHP21N06LT belongs to Nexperia's TrenchMOS™ logic-level power MOSFET product line, engineered for high-efficiency, low-voltage switching applications where gate drive simplicity and thermal robustness are critical.

FAQ

What is the maximum gate-source voltage rating for PHP21N06LT?

The PHP21N06LT has a continuous gate-source voltage rating of ±15 V and a pulsed rating of ±20 V (T_j ≤ 150 °C). Exceeding ±15 V continuously risks gate oxide damage; design must include clamping or series resistance to limit transient overshoot during switching.

Can PHP21N06LT be used with a 3.3 V microcontroller GPIO?

Yes, PHP21N06LT is specifically designed for logic-level operation: its gate threshold voltage ranges from 1.0 V to 2.0 V at 25 °C, and it achieves R_DS(ON) ≤ 75 mΩ at V_GS = 5 V. At 3.3 V, it delivers usable conduction (R_DS(ON) ≈ 100–120 mΩ), making it viable for moderate-current, low-duty-cycle applications with proper thermal margin.

What is the thermal resistance junction-to-mounting base for PHP21N06LT?

The PHP21N06LT has a maximum thermal resistance of R_{th j-mb} = 2.7 K/W, measured from junction to mounting base (tab). This value assumes proper mechanical contact and thermal interface material between the tab and heatsink; actual system R_{th j-a} depends on heatsink size and airflow.

Does PHP21N06LT have avalanche capability, and how is it specified?

Yes, PHP21N06LT is fully avalanche-rated: E_AS = 34 mJ (non-repetitive, unclamped inductive load, I_AS = 9.7 A, t_p = 100 µs, V_DD ≤ 25 V, R_GS = 50 Ω, V_GS = 5 V). This rating is verified per IEC 134 and enables robust operation in inductive switching without external protection.

What are the key differences between PHP21N06LT and PHB21N06LT?

PHP21N06LT uses the SOT78 (TO-220AB) through-hole package with pin 2 connected to drain and tab; PHB21N06LT uses the SOT404 (D2PAK) surface-mount package with pin 2 internally disconnected and tab connected to drain. Both share identical electrical specs, but PHP21N06LT is optimized for heatsink-mounted, high-power through-hole designs.