STMicroelectronics TMMBAT43FILM

Overview

TMMBAT43FILM from STMicroelectronics is a small-signal Schottky diode optimized for low-voltage, high-speed switching applications. It features a typical forward voltage of 0.26–0.33 V at 2 mA, 5 ns reverse recovery time, and 30 V repetitive peak reverse voltage. Used in portable power management, signal clamping, and polarity protection circuits where minimal conduction loss is critical.

For engineers reviewing the TMMBAT43FILM datasheet, TMMBAT43FILM pinout, TMMBAT43FILM application, or TMMBAT43FILM equivalent, key selection criteria include its low VF at microamp/milliamp bias levels, negligible switching losses, integrated ESD protection, and MINIMELF package compatibility with space-constrained PCB layouts.

Technical Context

This Schottky diode employs a metal-to-silicon junction to achieve fast switching and low forward voltage drop without minority-carrier storage delay. Its 5 ns trr and 7 pF junction capacitance at 1 V VR support high-frequency rectification up to ~100 MHz in RF detector and sample-and-hold circuits.

The device integrates on-chip ESD protection rated per IEC 61000-4-2 (±8 kV contact), enabling direct interface with exposed signal lines. Thermal resistance Rth(j-l) = 300 °C/W reflects its lead-frame-based MINIMELF construction, limiting continuous dissipation to 200 mW at 65 °C lead temperature.

Key Specifications

Pinout & Package

Package: MINIMELF (SOD-80 variant), surface-mount, cathode indicated by ring marking. Dimensions: 3.5 mm × 1.65 mm × 0.5 mm (L × Ø × H), lead pitch 2.5 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky diode applications.

Compared with BAT54C and NSR0230HT1G, TMMBAT43FILM uniquely balances 30 V reverse rating, sub-0.33 V VF at microamp bias, and certified ESD robustness-making it optimal for industrial USB ports and battery-backed sensor nodes requiring wide temperature and voltage margins.

Availability

TMMBAT43FILM is available at Aetrix Electronics and suitable for USB port protection, RF envelope detection, low-power sensor biasing, and logic-level clamping requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.

Supply support for TMMBAT43FILM 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

TMMBAT43FILM belongs to ST's small-signal Schottky diode product line, engineered specifically for ultra-low-VF, high-speed switching in space- and power-constrained portable and industrial electronics.

FAQ

What is the maximum continuous forward current rating for TMMBAT43FILM?

The maximum continuous forward current is 200 mA at 25 °C lead temperature. Derating applies above 25 °C: at 65 °C lead temperature, the device is rated for 200 mW total power dissipation, which corresponds to ~150 mA at 0.33 V VF. Exceeding this limit risks thermal runaway due to the diode's 300 °C/W junction-to-lead thermal resistance.

Does TMMBAT43FILM require external ESD protection in USB 2.0 data line applications?

No. TMMBAT43FILM integrates on-chip ESD protection rated to IEC 61000-4-2 Level 4 (±8 kV contact discharge), sufficient for USB 2.0 D+/D− line protection without additional TVS diodes. Its 7 pF junction capacitance also avoids signal integrity degradation at 480 Mbps data rates, unlike higher-capacitance alternatives.

Can TMMBAT43FILM replace TMMBAT42FILM in existing designs?

Yes, with functional trade-offs. Both share identical MINIMELF package and 30 V V_RRM, but TMMBAT43FILM has lower VF (0.26–0.33 V @ 2 mA) versus TMMBAT42FILM (0.4 V typ @ 10 mA). Substitution improves efficiency in micropower bias networks but may alter clamping thresholds in voltage-reference circuits relying on higher VF.

What is the storage temperature range, and does it affect solderability?

TMMBAT43FILM supports storage from -65 °C to +150 °C. Its solderability remains unaffected within this range; the device is qualified for reflow up to 260 °C for 15 seconds (per J-STD-020), matching standard lead-free PCB assembly processes. No pre-baking is required unless exposed to >60% RH for >168 hours.