onsemi TN5D41A-HB11-E

Overview

TN5D41A-HB11-E from SANYO Semiconductor is a monolithic 5V-output step-down switching regulator IC integrating a vertical P-channel MOSFET (R_DS(on) = 100 mΩ), PWM controller, and protection circuitry. It delivers up to 5 A output current with 88% efficiency at 20 V input/3 A load, operating across 10–40 V input range in industrial power supplies.

For engineers reviewing the TN5D41A-HB11-E datasheet, pinout, applications, or equivalent options, key selection criteria include its self-recovering over-current/over-temperature protection, soft-start timing control via external capacitor, standby-mode voltage threshold (0.3 V), and TO-220FI5H-HB package thermal performance (15 W at T_c = 25°C).

Technical Context

The TN5D41A-HB11-E implements a separately excited buck topology with internal P-ch MOSFET switching at 120–180 kHz. Its feedback loop uses a precision bandgap reference and error amplifier to regulate output voltage within ±0.5 mV/°C drift, while line/load regulation are specified at 60 mV and 80 mV respectively.

Protection functions operate autonomously: under-voltage lockout triggers at 7.2–8.8 V (hysteresis 1.0 V), over-current protection activates at 5.1–10 A, and thermal shutdown engages at 165°C with 25°C hysteresis - all self-recovering without latch-up.

Key Specifications

Pinout & Package

Package: TO-220FI5H-HB - isolated tab, 5-pin vertical through-hole, 16.0 mm × 14.0 mm footprint, designed for heatsink mounting and high-power dissipation (15 W at T_c = 25°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Compared with TN5D41A-HB11-E, TN5D41K-HB11-E offers identical performance with alternate part marking, while TPS54560BQPWPRQ1 trades integration for higher voltage/current capability and automotive qualification - requiring additional external components and tuning.

Availability

TN5D41A-HB11-E is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, telecom point-of-load converters, and embedded network router power stages requiring stable component supply and long-term lifecycle support.

Supply support for TN5D41A-HB11-E 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

SANYO Semiconductor was a Japanese semiconductor manufacturer specializing in power management, analog, and discrete devices before its acquisition by ON Semiconductor in 2011.

The TN5D41A-HB11-E belongs to the ExPD (Excellent-Performance Power & RF Device) family, designed specifically for compact, high-reliability DC-DC conversion in industrial and transportation equipment where integrated protection and thermal robustness are critical.

FAQ

What is the maximum allowable input voltage for the TN5D41A-HB11-E?

The TN5D41A-HB11-E has an absolute maximum input voltage rating of 57 V, with recommended operating input range of 10–40 V. Exceeding 57 V may cause permanent damage. The device incorporates under-voltage lockout (UVLO) that disables operation below 7.2 V and re-enables above 8.1 V to prevent erratic behavior during brownout conditions. Always observe these limits in both steady-state and transient conditions.

Does the TN5D41A-HB11-E require external components to function as a complete buck converter?

Yes, the TN5D41A-HB11-E requires external components to form a functional buck converter: an inductor (typically 100 μH), output capacitor (≥2200 μF), input capacitor (≥3000 μF), Schottky diode (e.g., SBT250-06J), and feedback resistors. The SS pin also requires an external capacitor for soft-start timing. These are specified in the ENA1029 datasheet's application circuit and evaluation board schematics.

How does the over-current protection (OCP) behave on the TN5D41A-HB11-E?

The TN5D41A-HB11-E features self-recovering over-current protection that activates when output current exceeds 5.1–10 A (depending on conditions). Upon trip, the internal MOSFET turns off and automatically resumes switching once current falls below the release threshold - no latch or external reset is needed. This behavior is confirmed in the datasheet's electrical characteristics table and protects against short-circuit and overload events without system interruption.

Can the TN5D41A-HB11-E be used in standby or remote ON/OFF control applications?

Yes, the TN5D41A-HB11-E supports standby mode via the SS pin: pulling SS ≤ 0.3 V (typ.) disables switching and reduces quiescent current to 500 μA. This allows external microcontroller or logic signal control of the 5 V output. The SS pin also serves as soft-start capacitor connection point - ensure external circuitry maintains safe voltage limits (≤7 V absolute max) during transitions.

What thermal derating applies to the TN5D41A-HB11-E in real-world PCB layouts?

The TN5D41A-HB11-E is rated for 15 W power dissipation at T_c = 25°C, but actual thermal performance depends heavily on PCB copper area, heatsink attachment, and airflow. Without a heatsink, allowable power drops to ~2.0 W at T_a = 25°C. Layout guidelines mandate thick, short traces for high-current paths (VIN, SWOUT, GND) and placement of input/output capacitors adjacent to respective pins to minimize parasitic inductance and thermal resistance.