Diodes Incorporated TB0720M-13

Overview

TB0720M-13 from Diodes Incorporated is a bi-directional surface-mount thyristor surge protective device (TSPD) designed for primary-level AC/DC line transient suppression in telecom and industrial interfaces. It features 65V stand-off voltage (VDRM), 88V breakover voltage (VBO), 50A peak pulse current (10/1000μs), 250A peak impulse current (8/20μs), and 140pF off-state capacitance - enabling robust GR-1089-CORE and IEC 61000-4-5 compliance in DSL, POTS, and PoE-powered equipment.

For engineers reviewing the TB0720M-13 datasheet, TB0720M-13 pinout, TB0720M-13 application, or TB0720M-13 equivalent, this device serves as a voltage-triggered crowbar protector with precise breakover threshold, low on-state voltage (3.5V @ 1A), and stable thermal coefficient (0.1%/°C), critical for reliable overvoltage clamping in bidirectional signal lines without polarity constraints.

Technical Context

This TSPD operates as a voltage-triggered silicon bilateral switch: it remains high-impedance below VDRM (65V), transitions rapidly to low-impedance conduction at VBO (88V ±5%), and sustains clamping until current falls below IH (150–800mA). Its oxide-glass passivated junction ensures stable leakage (<5μA) across –40°C to +150°C junction temperature range.

The device's bi-directional symmetry eliminates polarity marking requirements and supports AC-coupled protection paths. Its 20°C/W junction-to-lead thermal resistance enables direct PCB copper pour heat sinking, while 100°C/W junction-to-ambient rating defines derating curves for continuous surge duty cycles.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, bi-directional, non-polarized device with solderable matte tin-plated terminals (per MIL-STD-202, Method 208); UL 94V-0 rated molded plastic case; moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bi-directional thyristor surge protection applications.

Compared with SMBJ65CA and TPSMF65CA, TB0720M-13 provides true latching crowbar action with defined holding current (150–800mA), enabling fail-safe shutdown during sustained faults - a critical distinction for telecom line cards and PoE PSEs where temporary overvoltage must be actively cleared by upstream circuitry.

Availability

TB0720M-13 is available at Aetrix Electronics and suitable for DSL line interface protection, PoE power sourcing equipment, industrial analog I/O modules, and building automation control panels requiring stable component supply across multi-year production cycles.

Supply support for TB0720M-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability protection, power management, and signal integrity solutions for industrial, telecom, and automotive markets.

TB0720M-13 belongs to the TB-series bi-directional TSPD product line, engineered specifically for primary-side surge immunity in telecom infrastructure, PoE systems, and industrial control interfaces where latching crowbar behavior and precise voltage thresholds are mandatory.

FAQ

What is the recommended PCB layout for optimal thermal performance of TB0720M-13?

Use ≥25mm² of 2oz copper connected directly to both leads for heatsinking. Maintain ≥0.5mm clearance from adjacent components and avoid thermal reliefs on pads. The 20°C/W junction-to-lead resistance requires low-impedance copper paths to dissipate 30A surge energy without exceeding 150°C junction temperature.

Does TB0720M-13 require a series current-limiting resistor in-line with protected circuits?

No external current-limiting resistor is required for transient suppression, as the device self-latches and relies on system impedance to reduce current below its 150–800mA holding threshold. However, a fuse or polyfuse is recommended upstream to clear sustained fault currents and prevent thermal runaway.

How does TB0720M-13 behave during repeated surge events?

It withstands ≥1000 surges at 50A (10/1000μs) and ≥500 surges at 250A (8/20μs) with no parameter degradation, provided junction temperature remains within –40°C to +150°C and recovery time between pulses exceeds 30ms - verified per GR-1089-CORE cycling requirements.

Can TB0720M-13 be used in DC-only applications such as battery backup systems?

Yes - its bi-directional design supports DC line protection, but ensure system voltage remains ≤65V (VDRM) and fault current can fall below 150mA to allow automatic reset. For battery systems with weak current sources, add a parallel bleed resistor to guarantee turn-off after clamping.