Diodes Incorporated TT4M

Overview

TT4M from Diodes Incorporated is a 4A, 1000V standard recovery bridge rectifier in TTL package, featuring 1.0V max forward voltage at 2A, 5µA max reverse leakage at 1000V/25°C, and glass-passivated die construction for industrial AC-DC power supplies and motor control rectification.

For engineers reviewing the TT4M datasheet, TT4M pinout, TT4M application, or TT4M equivalent, key selection criteria include peak repetitive reverse voltage (1000V), average forward current derating with/without heatsink, thermal resistance (R_θJA = 60°C/W unmounted), junction capacitance (35pF), and AEC-Q200 readiness for automotive-grade reliability validation.

Technical Context

The TT4M integrates four standard recovery diodes in a single-phase full-wave bridge configuration with common-cathode and common-anode terminals, enabling direct AC-to-DC conversion without external interconnection. Its glass-passivated junction ensures stable reverse characteristics across -55°C to +150°C operating range and supports surge immunity up to 240A (1ms half-sine) at 25°C.

Thermal design relies on low R_θJC (8°C/W typical, unmounted) and R_θJL (10°C/W), allowing PCB-level heat dissipation via copper pads or optional fin heatsink mounting per JESD-51. Junction capacitance of 35pF at 1MHz/4V enables predictable EMI behavior in switching-adjacent rectifier stages.

Key Specifications

Pinout & Package

Package: TTL (single-in-line, 4-pin molded plastic with integrated bridge topology). Dimensions: 10.20 × 9.90 × 1.65 mm (L × W × H), weight ≈0.41 g, matte tin-plated leads, UL 94V-0 compliant green molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU4K, TT4M offers 10% lower forward voltage and 35% smaller footprint; versus DB104, it delivers 2.5× higher voltage rating and 4× higher current capacity-making it uniquely suited for compact, high-reliability 1000V rectification where thermal and space constraints dominate.

Availability

TT4M is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, appliance motor control rectifiers, and automotive body control modules requiring stable component supply and long-term lifecycle assurance.

Supply support for TT4M 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 targets cost-sensitive, high-volume applications demanding robustness, regulatory compliance (UL, RoHS, AEC-Q200), and thermal efficiency in space-constrained industrial and automotive power stages.

FAQ

What is the maximum allowable case temperature for continuous 4A operation?

The TT4M sustains 4.0A average forward current up to +75°C case temperature without heatsink, per Figure 1. With a 15mm×12mm aluminum pad on PCB, operation extends to +100°C case temperature. Exceeding these limits requires forced-air cooling or heatsink mounting per JESD-51 test conditions.

Is TT4M qualified to AEC-Q200 for automotive use?

TT4M is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q200, Diodes provides change-controlled automotive-grade variants upon request-contact local representatives for qualification path and test reports aligned with AEC-Q200 Rev D stress requirements.

How does the TTL package compare thermally to industry-standard GBU packages?

The TTL package has 35% smaller footprint than GBU4K and achieves R_θJA = 60°C/W (unmounted) versus ~75°C/W for GBU. Its lower profile (1.65mm height) improves airflow in stacked PCB assemblies, though GBU offers higher absolute I_FSM due to greater thermal mass.

Can TT4M replace DB104 in existing designs?

No-DB104 is rated for only 400V V_RRM and 1.0A I_F(AV), making it unsafe for 1000V applications. Substitution would risk catastrophic failure under normal line surges. A direct replacement requires matching V_RRM ≥1000V, I_F(AV) ≥4A, and TTL footprint compatibility-TT4M meets all three, while DB104 meets none.