Diodes Incorporated TT8M-T

Overview

TT8M from Diodes Incorporated is an 8A standard recovery bridge rectifier in TTL package, rated for 1000V repetitive peak reverse voltage (VRRM), 1.0V max forward voltage at 4A, and 5µA max leakage current at 1000V. It features glass-passivated die construction, RoHS-compliant matte tin-plated leads, and is optimized for PCB-mounted AC/DC front-end rectification in industrial power supplies.

For engineers reviewing the TT8M datasheet, TT8M pinout, TT8M application, or TT8M equivalent, key selection criteria include its 8A average forward current rating, thermal resistance of 55°C/W (junction-to-ambient, no heatsink), UL recognition (E364304), and suitability for non-switching, line-frequency rectification where low cost and reliability are prioritized over fast recovery.

Technical Context

The TT8M implements a single-phase full-wave bridge configuration with four series-connected PN junctions in a monolithic molded plastic package. Its standard recovery characteristic (non-fast, non-ultrafast) results in typical junction capacitance of 55pF at 1MHz and 4V reverse bias, and reverse recovery time not specified - confirming design intent for ≤60Hz or low-frequency (<1kHz) operation.

Thermal performance is defined by three R_θ values: 7°C/W (junction-to-case), 6°C/W (junction-to-lead), and 55°C/W (junction-to-ambient, no heatsink). Derating curves show usable 8A average current only up to +25°C ambient without heatsink, dropping to ~3.5A at +75°C - indicating mandatory thermal management for sustained high-load operation.

Key Specifications

Pinout & Package

Package: TTL (single-in-line, 4-terminal molded plastic package with integrated bridge topology; body marking "Green TT8M" indicates halogen-free compliance).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bridge rectifier applications.

Compared with GBU8K and KBPC810, the TT8M offers superior thermal resistance (55°C/W vs. 65°C/W), lower VF (1.0V vs. 1.1V), and tighter IR spec (5µA vs. 10µA), making it optimal for compact, thermally demanding industrial rectifiers requiring long-term stability.

Availability

TT8M is available at Aetrix Electronics and suitable for industrial power supplies, AC motor control boards, LED streetlight drivers, and UPS input stages requiring stable component supply, RoHS compliance, and UL recognition.

Supply support for TT8M 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The TTL-packaged bridge rectifier product line - including TT8M - is engineered for cost-sensitive, high-volume AC/DC conversion in industrial, lighting, and power infrastructure applications where reliability, safety certification, and thermal robustness are essential.

FAQ

Is TT8M suitable for high-frequency switching applications like PFC or SMPS primary rectification?

No. TT8M is a standard recovery bridge rectifier with no specified reverse recovery time (trr) and typical junction capacitance of 55pF - characteristics incompatible with >1kHz switching. It is designed exclusively for line-frequency (50/60Hz) rectification. Using it in high-frequency circuits causes excessive switching losses and EMI.

What is the maximum ambient temperature for continuous 8A operation without a heatsink?

Per Figure 2 in DS43677 Rev. 4-2, the TT8M delivers 8A average forward current only up to +25°C ambient temperature without heatsink. At +50°C ambient, derated current drops to approximately 5.5A; at +75°C, it falls to ~3.5A. Heatsinking is mandatory for full-rated current above +25°C.

Does TT8M meet AEC-Q200 for automotive use?

No. The datasheet explicitly states that automotive-qualified parts require AEC-Q200 qualification, PPAP capability, and IATF 16949 manufacturing - none of which are claimed for TT8M. It is intended for industrial, commercial, and lighting applications, not automotive ECUs or ADAS systems.

Can TT8M be soldered using standard lead-free reflow profiles?

Yes. With Moisture Sensitivity Level 1 per J-STD-020 and matte tin-plated leads compliant with MIL-STD-202 Method 208, TT8M supports standard IPC/JEDEC J-STD-020 Class 1 reflow profiles (peak 260°C, 60s max above 217°C) without pre-bake or special handling.