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Diodes Incorporated TT8M
- Part No.:
- TT8M
- Manufacturer:
- Diodes Incorporated
- Category:
- Bridge Rectifiers
- Package:
- 4-SMD, Gull Wing
- Datasheet:
-
TT8M.pdf
- Description:
- BRIDGE RECT 1PHASE 1KV 8A TT
- Quantity:
- Payment:
- Shipping:
Inventory:2,681
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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 and 1.0V max forward voltage at 4A, with 5µA max reverse leakage at 1000V. It delivers reliable AC-to-DC conversion in offline power supplies, motor control front-ends, and industrial AC line input stages.
For engineers reviewing the TT8M datasheet, TT8M pinout, TT8M application, or TT8M equivalent, key selection criteria include its 1000V VRRM rating, 8A average forward current 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 with common-cathode and common-anode terminals. Its glass-passivated junction ensures stable reverse characteristics across -55°C to +150°C operating temperature range.
It supports non-repetitive surge currents up to 330A (1.0ms half-sine) and exhibits 55pF typical junction capacitance at 1MHz/4V reverse bias-critical for EMI filtering and snubber design in high-frequency switching environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1000 V - Withstands peak AC line transients up to 1000V without breakdown in universal-input SMPS. |
| IF(AV) | 8.0 A - Sustains continuous DC output current in 100–240VAC input rectification with derating above 25°C ambient. |
| VF Max @ 4A | 1.0 V - Limits conduction loss to ≤4W per diode pair at full load, enabling thermally constrained PCB layouts. |
| IR Max @ 1000V | 5 µA - Ensures minimal standby power loss in energy-sensitive applications like IoT gateways and smart meters. |
| RθJA | 55 °C/W - Defines thermal rise under natural convection; requires heatsink or copper pour for >4A sustained operation. |
| IFS M (1.0ms) | 330 A - Handles inrush surges from cold-started transformers or capacitive inputs without failure. |
Pinout & Package
Package: TTL (single-phase bridge rectifier outline per Diodes Inc. package drawing TTL). Dimensions: 10.20mm × 9.90mm × 1.65mm (L×W×H), with 4.90mm lead pitch and matte tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ~AC1 | AC Input Terminal 1 | One leg of AC input; connects to live/phase side of transformer secondary or mains input. |
| ~AC2 | AC Input Terminal 2 | Second leg of AC input; completes full-wave bridge input path with ~AC1. |
| +DC | Positive DC Output | Anode of output diodes; delivers rectified positive rail to bulk capacitor or downstream regulator. |
| -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 performance and long-term reliability under humid or thermally cycling conditions. |
| UL Recognized (E364304) | Validates safety compliance for end-equipment certification in industrial and consumer power supplies. |
| Lead-free & "Green" construction | Meets RoHS 3 and halogen/antimony restrictions (<900ppm Br/Cl, <1000ppm Sb), supporting eco-design mandates. |
| TTL package with 15mm×12mm copper pad layout | Optimized for low RθJL (6°C/W) when mounted on specified PCB copper area, improving thermal headroom. |
Applications
| Industrial AC-DC Power Supplies | Appliance Motor Control Front-Ends |
|---|---|
Use Scenario: Rectifying 230VAC mains input in DIN-rail mounted PLC power modules. IC Role / Device Role / Timing Role: Full-wave bridge rectifier converting AC line to unregulated DC bus prior to PFC and DC-DC stages. Use Value: 1000V VRRM withstands 230VAC + 150% surge; 8A IF(AV) supports 150W output with margin. |
Use Scenario: Input rectification for universal motor drives in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Bridge rectifier feeding DC link capacitor bank that powers inverter stage. Use Value: Glass passivation prevents parameter drift during repeated thermal cycling; 330A IFSM handles motor startup surges. |
| LED Streetlight Drivers | Smart Meter Power Conversion |
Use Scenario: Off-line LED driver input stage in outdoor-rated luminaires exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary rectifier delivering DC bus to flyback controller IC and primary-side regulation circuitry. Use Value: -55°C to +150°C TJ range ensures operation in sealed enclosures; 5µA IR minimizes no-load consumption. |
Use Scenario: Energy meter power supply deriving auxiliary 5V/3.3V rails from 220VAC utility lines. IC Role / Device Role / Timing Role: Bridge rectifier feeding low-power linear or buck converter supplying MCU and metrology ICs. Use Value: UL recognition simplifies end-product safety approval; RoHS/Green compliance meets global regulatory requirements. |
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 suitable for space-constrained designs. | Choose when legacy GBU footprint compatibility is required and board space permits. |
| KBPC810 (Shindengen) | Identical TTL package, but VF = 1.1V max @ 4A and IR = 10µA max @ 1000V - higher conduction loss and leakage. | Higher standby power and thermal stress in high-temperature environments (>85°C ambient). | Acceptable for cost-sensitive, non-thermally critical applications where 0.1V VF margin is acceptable. |
Compared with GBU8K and KBPC810, the TT8M offers superior thermal performance (55°C/W vs. 65°C/W), lower leakage (5µA vs. 10µA), and tighter VF (1.0V vs. 1.1V), making it optimal for compact, high-efficiency, and temperature-stressed AC-DC front-ends.
Availability
TT8M is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, appliance motor control front-ends, and LED streetlight drivers requiring stable component supply, long-lifecycle support, and consistent parametric performance.
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, specializing in high-reliability power management, signal integrity, and protection solutions.
The TT8M belongs to Diodes' standard recovery bridge rectifier product line, engineered for cost-effective, robust AC line rectification in industrial, appliance, and infrastructure applications demanding safety certification and environmental compliance.
FAQ
What is the maximum allowable case temperature for continuous 8A operation?
The TT8M supports 8A average forward current only at TA = +25°C with no heatsink (Figure 1). At 75°C ambient, derating reduces IF(AV) to ~4.5A. For full 8A operation above 25°C, a heatsink or ≥15mm×12mm copper pad per Diodes' JESD-51 layout is mandatory to maintain TJ ≤150°C.
Is the TT8M qualified for automotive applications?
No - the TT8M is not AEC-Q101 qualified. Diodes explicitly states that automotive-grade parts require PPAP capability and IATF 16949 manufacturing; the TT8M datasheet lists only industrial-grade qualifications (UL, RoHS, Green). For automotive use, contact Diodes for AEC-Q101-certified alternatives like the ABS8M or GBU8J.
How does the TTL package compare thermally to the GBU package?
The TTL package achieves RθJA = 55°C/W (no heatsink) versus ~65°C/W for GBU8K, due to optimized leadframe geometry and recommended 15mm×12mm copper pad layout. This 10°C/W improvement allows ~1.5A higher continuous current at the same ambient temperature without added heatsinking.
Can the TT8M replace a KBPC808 in an existing design?
Yes - both are 8A/800V bridges in TTL/GBU-compatible footprints. However, the TT8M's 1000V VRRM provides 200V higher surge margin than KBPC808's 800V rating, and its 1.0V VF is 0.1V lower. Verify PCB layout clearance for 1000V creepage and confirm thermal design accommodates identical or improved dissipation.
TT8M 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 FAQ
1.How can I place an order for TT8M through Aetrix?
Please submit a Request for Quotation (RFQ) for TT8M 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 reliable?
The price and inventory of TT8M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TT8M is usually 5 days.
3.What payment methods are accepted for TT8M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TT8M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TT8M?
TT8M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TT8M 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?
For technical support, including TT8M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TT8M requirements.
6.How does Aetrix verify that TT8M is sourced from the original manufacturer or authorized distributors?
All TT8M 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 meets industry standards.
7.What is the process for return or replacement of TT8M?
All TT8M units undergo pre-shipment inspection (PSI). If there is an issue with TT8M, 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 part is unused and in its original packaging.
Return procedure for TT8M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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