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Diodes Incorporated TT8M_HF
- Part No.:
- TT8M_HF
- Manufacturer:
- Diodes Incorporated
- Category:
- Bridge Rectifiers
- Package:
- 4-SMD, Gull Wing
- Datasheet:
-
TT8M_HF.pdf
- Description:
- BRIDGE RECT 1PHASE 1KV 8A TT
- Quantity:
- Payment:
- Shipping:
Inventory:1,355
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Product details
Overview
TT8M from Diodes Incorporated is an 8A standard recovery bridge rectifier in TTL package, rated for 1000V repetitive peak reverse voltage, with 1.0V max forward voltage at 4A and 5µA max reverse leakage at 1000V, used in AC/DC power supplies for industrial motor drives and HVAC control systems.
For engineers reviewing the TT8M datasheet, TT8M pinout, TT8M application, or TT8M equivalent, key selection criteria include its 8A average forward current rating, 1000V VRRM capability, thermal resistance of 55°C/W (junction-to-ambient, no heatsink), glass-passivated die construction, and RoHS-compliant matte tin-plated leads.
Technical Context
The TT8M integrates four standard-recovery diodes in a single-phase full-wave bridge configuration, enabling AC input rectification without external interconnection. Its glass-passivated junction ensures stable reverse characteristics across -55°C to +150°C operating range.
Thermal performance is defined by three Rθ values: 7°C/W (junction-to-case), 6°C/W (junction-to-lead), and 55°C/W (junction-to-ambient, no heatsink). Derating curves confirm 8A operation up to 25°C ambient without heatsink, dropping to ~4.5A at 75°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1000 V - Withstands 1000V repetitive reverse voltage without breakdown, suitable for 800VAC line applications with safety margin. |
| IF(AV) | 8.0 A - Continuous average forward current rating at 25°C case temperature, defining maximum steady-state DC output capability. |
| VF Max | 1.0 V @ 4A - Maximum forward voltage drop at 4A, directly impacting conduction loss and thermal load in power stage. |
| IR Max | 5 µA @ 1000V - Maximum reverse leakage at rated blocking voltage and 25°C, critical for low-power standby efficiency. |
| IFSMT | 165 A @ 8.3ms - Non-repetitive surge current rating, supporting inrush handling during AC line turn-on. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance without heatsink, determining required PCB copper area for thermal management. |
| CJ | 55 pF @ 1MHz - Junction capacitance at 4V reverse bias, influencing high-frequency switching noise and EMI filter design. |
Pinout & Package
Package: TTL (single-phase bridge rectifier outline per Diodes Inc. package drawings), molded plastic with green UL 94V-0 compound, matte tin-plated leads, 0.41g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ~AC1 | AC Input Terminal 1 | One leg of AC input; connects to transformer secondary or line input; polarity-marked on body. |
| ~AC2 | AC Input Terminal 2 | Second leg of AC input; completes full-wave bridge input path; marked opposite ~AC1. |
| +DC | Positive DC Output | Anode of output diodes; delivers rectified positive voltage to bulk capacitor or regulator input. |
| -DC | Negative DC Output / Common Return | Cathode of output diodes; serves as system ground reference and return path for DC load current. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable IR and VF over temperature and lifetime, reducing parameter drift in industrial environments. |
| UL Recognized (E364304) | Validates safety compliance for end-equipment certification in North America and globally. |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900ppm Br, <900ppm Cl, <1000ppm Sb, supporting eco-design requirements. |
| TTL package footprint | Optimized for automated PCB assembly with 10.2mm × 9.9mm body and 5.0mm × 1.8mm pad layout, minimizing board space. |
Applications
| Industrial Motor Drives | HVAC Control Power Supplies |
|---|---|
Use Scenario: Rectifying 230VAC or 400VAC input in variable-frequency drive (VFD) auxiliary power supplies. IC Role / Device Role / Timing Role: Full-wave bridge rectifier converting AC line to unregulated DC bus for control circuitry. Use Value: 1000V VRRM provides 2× safety margin over 400VAC peak, while 8A IF(AV) supports multi-rail 24V/12V logic supply generation. | Use Scenario: Providing isolated DC bias for thermostats, damper actuators, and communication modules in commercial HVAC units. IC Role / Device Role / Timing Role: Primary rectification stage feeding linear regulators or buck converters powering microcontrollers and sensors. Use Value: Low 5µA IR at 1000V minimizes standby power loss; glass passivation ensures reliability under cyclic thermal stress in duct-mounted enclosures. |
| AC/DC Adapters for Industrial Equipment | Power Factor Correction Front-End Stages |
Use Scenario: High-efficiency offline adapters delivering 5–24V DC to programmable logic controllers (PLCs) and I/O modules. IC Role / Device Role / Timing Role: Input-stage bridge rectifier preceding bulk capacitor and downstream switching regulator. Use Value: 1.0V VF max at 4A limits conduction loss to ≤4W, easing thermal design on compact PCBs with limited heatsinking. | Use Scenario: Pre-regulator stage in active PFC circuits where standard recovery speed is acceptable due to low-frequency line operation. IC Role / Device Role / Timing Role: Uncontrolled rectifier feeding boost converter input; operates at 50/60Hz, not high-frequency switching. Use Value: 55pF junction capacitance avoids parasitic resonance issues at line frequency, unlike fast-recovery devices optimized for kHz–MHz switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bridge rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GBU8K (ON Semiconductor) | Same 8A/1000V rating, but GBU package (larger footprint, higher RθJA = 65°C/W). | Requires larger PCB area and more copper for thermal management; less suited for space-constrained designs. | Select when legacy GBU footprint compatibility is required or when higher surge tolerance (200A IFSM) is prioritized over size. |
| DB108S (Diotec) | 8A/1000V, same TTL package, but VF = 1.1V max @ 4A and IR = 10µA @ 1000V. | Slightly higher conduction loss and leakage; may impact efficiency-critical or low-standby-power designs. | Choose for cost-sensitive applications where 0.1V VF and 5µA IR margin are non-critical. |
Compared with GBU8K and DB108S, the TT8M offers the lowest thermal resistance in TTL form factor (55°C/W vs. 65°C/W) and tightest leakage spec (5µA), making it optimal for thermally constrained industrial power supplies requiring long-term stability.
Availability
TT8M is available at Aetrix Electronics and suitable for industrial motor drives, HVAC control power supplies, and AC/DC adapters requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.
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 the Americas.
The TT8M belongs to Diodes' standard recovery bridge rectifier product line, engineered for cost-effective, reliable AC/DC conversion in industrial and appliance power supplies where high surge tolerance and thermal robustness are essential.
FAQ
What is the maximum operating temperature for the TT8M?
The TT8M has an operating junction temperature range of -55°C to +150°C. Its derating curve shows that at 25°C ambient, it supports full 8A average forward current without heatsink; above 25°C, current must be reduced per Figure 1 and Figure 2 in DS43677 Rev. 4-2.
Is the TT8M suitable for automotive applications?
The TT8M is not AEC-Q200 qualified and is not intended for automotive use. Diodes Incorporated explicitly states that automotive-grade parts require specific change control, PPAP capability, and IATF 16949 manufacturing-none of which apply to the standard TT8M.
How does the TTL package compare to GBU or KBU packages?
The TTL package measures 10.2mm × 9.9mm with a 5.0mm × 1.8mm pad layout, making it significantly smaller than GBU (22mm × 18mm) or KBU (22mm × 18mm) packages. This reduces PCB area by >50% while maintaining 8A/1000V ratings, though thermal resistance is higher than bolt-down alternatives.
Can the TT8M replace a fast recovery bridge rectifier?
No-the TT8M is a standard recovery device (reverse recovery time not specified, typical for 50/60Hz operation), whereas fast recovery bridges have trr < 500ns for switching applications. Substituting it in SMPS front-ends risks excessive switching loss, EMI, and potential failure due to slow recovery-induced voltage spikes.
TT8M_HF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-SMD, Gull Wing
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Diode Type:
- Single Phase
- Technology:
- Standard
- Voltage - Peak Reverse (Max):
- 1 kV
- Current - Average Rectified (Io):
- 8 A
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 4 A
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1000 V
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TT
TT8M_HF FAQ
1.How can I place an order for TT8M_HF through Aetrix?
Please submit a Request for Quotation (RFQ) for TT8M_HF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TT8M_HF reliable?
The price and inventory of TT8M_HF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TT8M_HF is usually 5 days.
3.What payment methods are accepted for TT8M_HF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TT8M_HF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TT8M_HF?
TT8M_HF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TT8M_HF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TT8M_HF?
For technical support, including TT8M_HF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TT8M_HF requirements.
6.How does Aetrix verify that TT8M_HF is sourced from the original manufacturer or authorized distributors?
All TT8M_HF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TT8M_HF meets industry standards.
7.What is the process for return or replacement of TT8M_HF?
All TT8M_HF units undergo pre-shipment inspection (PSI). If there is an issue with TT8M_HF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TT8M_HF part is unused and in its original packaging.
Return procedure for TT8M_HF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TT8M_HF Tags
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