Toshiba Semiconductor and Storage TK040Z65Z,S1F

Overview

TK040Z65Z,S1F from Toshiba Electronic Devices & Storage Corporation is a silicon N-channel DTMOS™ power MOSFET designed for high-efficiency switching in primary-side SMPS. It delivers 650 V V_DSS, 57 A I_D (DC), R_DS(ON) = 0.033 Ω (typ.), and operates with V_th = 3–4 V, enabling robust gate drive in industrial AC-DC adapters and server power supplies.

For engineers reviewing the TK040Z65Z,S1F datasheet, TK040Z65Z,S1F pinout, TK040Z65Z,S1F application, or TK040Z65Z,S1F equivalent, key selection criteria include avalanche energy rating (E_AS = 702 mJ), low C_iss (6250 pF), TO-247-4L(T) package thermal performance (R_th(ch-c) = 0.347 °C/W), and source-pin separation for current path optimization.

Technical Context

This device implements Toshiba's Double-Diffused MOS (DTMOS) structure to reduce specific on-resistance while maintaining high-voltage ruggedness. Its 4-pin TO-247-4L(T) layout isolates gate return (Source 2) from main current path (Source 1), minimizing common-source inductance during fast switching.

Designed for hard-switched topologies, it supports 400 V V_DD operation with t_on = 75 ns and t_off = 170 ns at I_D = 28.5 A, and exhibits dv/dt ruggedness up to 5 V/ns - critical for noise-immune operation in high-density PFC and LLC resonant converters.

Key Specifications

Pinout & Package

Package: TO-247-4L(T), also designated 2-16M2A; thermally optimized 4-lead through-hole package with isolated source terminals and integral heatsink tab (Drain-connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage power MOSFET applications.

Compared with STW65N60DM6 and IXFH50N65X2, TK040Z65Z,S1F offers superior R_DS(ON) and integrated source separation - delivering measurable efficiency gain in high-frequency, high-power SMPS where layout-induced ringing and thermal density are critical constraints.

Availability

TK040Z65Z,S1F is available at Aetrix Electronics and suitable for server power supplies, industrial AC-DC adapters, and telecom rectifiers requiring stable component supply and long-term production continuity.

Supply support for TK040Z65Z,S1F 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

Toshiba Electronic Devices & Storage Corporation is a Japanese semiconductor manufacturer specializing in power devices, logic ICs, and storage solutions, with decades of expertise in discrete power transistor design.

The TK040Z65Z,S1F belongs to Toshiba's DTMOS™ VI series, engineered specifically for high-efficiency, high-reliability switching power supplies targeting datacenter, industrial, and telecom infrastructure applications.

FAQ

What is the maximum continuous drain current for TK040Z65Z,S1F at 100°C case temperature?

At T_c = 100°C, the maximum continuous drain current for TK040Z65Z,S1F is derated to 38 A per the PD–Tc curve (Fig. 8.15). This reflects thermal limitation rather than electrical failure - the device maintains full 650 V blocking capability and 0.04 Ω R_DS(ON) max at that temperature. Always verify actual channel temperature using R_th(ch-c) = 0.347 °C/W in your thermal model before finalizing heatsink design for TK040Z65Z,S1F.

Does TK040Z65Z,S1F require a negative gate voltage for reliable turn-off?

No, TK040Z65Z,S1F does not require negative gate bias. Its V_th range of 3–4 V ensures clean turn-off with 0 V gate drive, and its low Crss (4 pF) minimizes Miller-induced false turn-on. However, applying −5 V during off-state improves noise immunity in high-dv/dt environments - this is optional, not mandatory. The gate oxide is rated for ±30 V, so TK040Z65Z,S1F supports such bias if system layout justifies the added complexity.

How is the TO-247-4L(T) package of TK040Z65Z,S1F mounted for optimal thermal performance?

For optimal thermal performance, mount TK040Z65Z,S1F's Drain (Pin 1) directly to a flat, clean, anodized aluminum heatsink using thermal compound and torque-controlled fastening (0.8 N·m). Ensure Source 1 (Pin 2) connects via short, wide copper pours to minimize parasitic inductance, while Source 2 (Pin 3) routes separately to the gate driver ground plane. Do not electrically connect Drain and Source 1 to the same net - their isolation is fundamental to TK040Z65Z,S1F's layout advantage.

Can TK040Z65Z,S1F replace older TK040V65Z in existing designs?

Yes, TK040Z65Z,S1F is a direct replacement for TK040V65Z with identical pinout, package, and absolute ratings. Key improvements include lower R_DS(ON) (0.033 Ω vs. 0.038 Ω), reduced Q_gd (27 nC vs. 31 nC), and enhanced dv/dt ruggedness (5 V/ns vs. 3.5 V/ns). No PCB changes are required, but gate resistor tuning may yield additional efficiency gains due to faster switching in TK040Z65Z,S1F.

What is the recommended gate resistor value for TK040Z65Z,S1F in a 200 kHz LLC resonant converter?

For a 200 kHz LLC resonant converter, a 4.7 Ω gate resistor is recommended for TK040Z65Z,S1F to balance switching speed (t_on/t_off) and EMI. This value limits peak gate current to ~2.1 A with 10 V drive, avoids excessive ringing from low-impedance driving, and keeps Q_g-related losses below 0.3 W at full switching frequency. Always validate with oscilloscope measurements of V_GS and V_DS waveforms under actual load conditions for TK040Z65Z,S1F.