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Diodes Incorporated DF1508M
- Part No.:
- DF1508M
- Manufacturer:
- Diodes Incorporated
- Category:
- Bridge Rectifiers
- Package:
- 4-EDIP (0.300", 7.62mm)
- Datasheet:
-
DF1508M.pdf
- Description:
- BRIDGE RECT 1PHASE 800V 1.5A DFM
- Quantity:
- Payment:
- Shipping:
Inventory:4,343
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Product details
Overview
DF1508M from Diodes Incorporated is a 1.5A glass passivated bridge rectifier with 800V peak repetitive reverse voltage (VRRM), 1.1V forward voltage at 1.5A (VFM), and 50A non-repetitive surge current rating (IFSM), designed for printed circuit board AC/DC front-end conversion in industrial power supplies.
For engineers reviewing the DF1508M datasheet, DF1508M pinout, DF1508M application, or DF1508M equivalent, key selection criteria include VRRM derating for capacitive loads, thermal resistance (RθJA = 40°C/W on 13×13 mm PCB pad), I²t fusing rating (10.4 A²s), and UL recognition (E94661) for safety-compliant designs.
Technical Context
This single-phase, full-wave bridge rectifier integrates four silicon diodes in a monolithic DF-M molded plastic package with tin-plated terminals. It operates under 60Hz resistive or inductive loads, with mandatory 20% current derating for capacitive loads per specification.
The device exhibits 25pF typical junction capacitance at 1MHz and 4.0V reverse bias, and maintains ≤500µA peak reverse leakage (IRM) at 125°C - critical for high-temperature industrial environments where thermal stability directly impacts system reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - maximum peak reverse voltage the bridge withstands without breakdown; defines safe AC input range up to ~560V RMS. |
| IO @ TA=40°C | 1.5 A - average DC output current capability when mounted on standard PCB land pattern; requires thermal management above 40°C ambient. |
| VFM @ IF=1.5A | 1.1 V - total forward drop across two series diodes in conduction path; determines conduction loss (1.65W at full load). |
| IFSM (8.3ms) | 50 A - surge current tolerance during cold-start or line transients; enables robustness against inrush without fuse coordination issues. |
| RθJA | 40 °C/W - thermal resistance junction-to-ambient on 13×13 mm copper pad; sets temperature rise (60°C at 1.5A) for thermal design margining. |
| IRM @ 125°C | 500 µA - maximum reverse leakage at elevated temperature; impacts standby power and isolation integrity in high-temp applications. |
| I²t | 10.4 A²s - fusing integral for short-circuit protection coordination; used to select upstream fuse time-current curves. |
Pinout & Package
DF1508M uses the DF-M surface-mount package (7.4–7.9 mm × 6.2–6.5 mm × 2.4–3.4 mm height), molded plastic with UL 94V-0 flammability rating and tin-plated terminals. Polarity is marked on case; weight ≈0.38 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ~AC1 | AC Input Terminal 1 | One of two alternating current input nodes; connects to live/phase side of transformer secondary or AC line. |
| ~AC2 | AC Input Terminal 2 | Second AC input node; completes full-wave bridge input path with ~AC1. |
| +DC | Positive DC Output | Anode of internal upper diodes; delivers rectified positive output to filter capacitor or regulator input. |
| –DC | Negative DC Output / Common | Cathode of internal lower diodes; serves as return path and system ground reference for downstream circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die construction | Enables stable long-term operation under humidity and thermal cycling; eliminates need for hermetic sealing in industrial enclosures. |
| UL Recognized Component (E94661) | Validates compliance with UL 60950-1/62368-1 for end-equipment safety certification without additional component-level testing. |
| Lead-free & RoHS compliant (Date Code 0532+) | Meets EU Directive 2011/65/EU requirements; supports environmentally compliant manufacturing and global market access. |
| Moisture Sensitivity Level 1 | No bake preconditioning required before reflow; simplifies SMT assembly and reduces production risk. |
| 800V VRRM with 50A IFSM | Supports universal input (85–265V AC) designs with margin for line surges and transient overvoltage events. |
Applications
| Industrial AC/DC Power Supplies | LED Driver Front-End Rectification |
|---|---|
Use Scenario: 100–240V AC input stage in DIN-rail mounted power supplies for PLCs and motor controllers. IC Role / Device Role / Timing Role: Full-wave bridge rectifier converting AC mains to unregulated DC bus prior to bulk capacitor filtering and DC/DC conversion. Use Value: 800V VRRM provides 2× margin over 265V AC peak (375V), ensuring reliability during brownouts and line spikes common in factory environments. | Use Scenario: Off-line LED driver powering high-bay fixtures in warehouse lighting systems. IC Role / Device Role / Timing Role: Primary rectification element feeding constant-current LED controller ICs like AL1676 or BP5758D. Use Value: 1.1V VFM minimizes conduction loss at 1.5A, improving overall efficiency and reducing heatsink requirements in thermally constrained enclosures. |
| Appliance Control Board Power | Smart Meter AC Input Stage |
Use Scenario: Power supply for microcontroller-based control boards in washing machines and HVAC systems. IC Role / Device Role / Timing Role: AC-to-DC conversion for 5V/3.3V logic rails and relay driver circuits. Use Value: UL E94661 recognition eliminates need for separate safety agency approval of rectifier subassembly, accelerating product certification. | Use Scenario: Energy meter with direct AC mains interface requiring high-reliability, long-lifetime rectification. IC Role / Device Role / Timing Role: Input-stage bridge providing isolated DC rail for metrology SoCs (e.g., ADE7953) and communication modules. Use Value: 500µA IRM at 125°C ensures low leakage-induced measurement drift over 15+ year field life in hot, enclosed meter housings. |
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 800V VRRM and 1.5A IO, but GBU package (larger footprint, higher RθJA = 50°C/W). | Requires larger PCB area and additional thermal relief; less suitable for space-constrained designs. | Prefer when legacy GBU layout exists or higher surge margin (60A IFSM) is needed. |
| MB158 (Rectron) | 800V VRRM, 1.5A IO, but DF-M compatible footprint and RθJA = 42°C/W; RoHS compliant but no UL listing. | Lacks UL E94661 recognition - necessitates full end-product safety retesting. | Acceptable for cost-sensitive, non-safety-certified equipment where UL is not mandated. |
Compared with GBU8K and MB158, DF1508M uniquely combines UL recognition, DF-M footprint compatibility, and 40°C/W thermal resistance - making it optimal for new industrial designs requiring certified, compact, and thermally efficient AC/DC front ends.
Availability
DF1508M is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, LED driver front-ends, and smart meter AC input stages requiring stable component supply and long-term lifecycle support.
Supply support for DF1508M 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, serving industrial, computing, consumer, and communications markets.
The DF-series bridge rectifiers are engineered for high-reliability, cost-optimized AC/DC conversion in safety-critical and thermally demanding applications - emphasizing UL recognition, surge robustness, and RoHS compliance from wafer to packaging.
FAQ
Is DF1508M suitable for capacitive-load applications?
No - the datasheet explicitly requires 20% derating of average output current (to 1.2A) when used with capacitive loads due to increased peak currents and thermal stress. This must be accounted for in bulk capacitor sizing and thermal design to avoid premature failure.
What is the minimum PCB copper area needed for thermal performance?
The 40°C/W RθJA rating assumes 13×13 mm (0.03 mm thick) copper land areas per terminal. Reducing pad size increases thermal resistance linearly; for example, halving pad area raises RθJA to ~60°C/W, limiting usable current to ~1.0A at 40°C ambient.
Does DF1508M require moisture preconditioning before reflow soldering?
No - it is rated Moisture Sensitivity Level 1 per J-STD-020C, meaning it can be stored indefinitely at ≤30°C/60% RH and placed directly into reflow without baking, simplifying SMT line logistics and eliminating moisture-related popcorning risk.
Can DF1508M replace DF1506M in an existing design?
Yes - both share identical DF-M package, pinout, and thermal characteristics; DF1508M offers higher 800V VRRM vs. 600V for DF1506M, providing additional margin for line surges and enabling use in wider-input-range applications without layout changes.
DF1508M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-EDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Diode Type:
- Single Phase
- Technology:
- Standard
- Voltage - Peak Reverse (Max):
- 800 V
- Current - Average Rectified (Io):
- 1.5 A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 1.5 A
- Current - Reverse Leakage @ Vr:
- 10 µA @ 800 V
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DFM
DF1508M FAQ
1.How can I place an order for DF1508M through Aetrix?
Please submit a Request for Quotation (RFQ) for DF1508M 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 DF1508M reliable?
The price and inventory of DF1508M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DF1508M is usually 5 days.
3.What payment methods are accepted for DF1508M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DF1508M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DF1508M?
DF1508M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DF1508M 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 DF1508M?
For technical support, including DF1508M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DF1508M requirements.
6.How does Aetrix verify that DF1508M is sourced from the original manufacturer or authorized distributors?
All DF1508M 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 DF1508M meets industry standards.
7.What is the process for return or replacement of DF1508M?
All DF1508M units undergo pre-shipment inspection (PSI). If there is an issue with DF1508M, 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 DF1508M part is unused and in its original packaging.
Return procedure for DF1508M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DF1508M Tags
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HDS10M-13
Diodes Incorporated
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MB10S-13
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