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Microchip Technology 681-4
- Part No.:
- 681-4
- Manufacturer:
- Microchip Technology
- Category:
- Diode Arrays
- Package:
- ND
- Datasheet:
-
681-4.pdf
- Description:
- DIODE MODULE GP 400V 15A ND
- Quantity:
- Payment:
- Shipping:
Inventory:6,957
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Product details
Overview
681-4 from Microsemi is a standard-recovery, center-tap positive (P) rectifier assembly in an electrically isolated aluminum case, rated for 400 V VRWM, 15 A average DC output current at TC = 55 °C, and 150 A nonrepetitive surge current. It serves as a high-current AC-to-DC conversion stage in industrial power supplies and motor drive front-ends.
For engineers reviewing the 681-4 datasheet, 681-4 pinout, 681-4 application, or 681-4 equivalent, key selection criteria include its 400 V working peak reverse voltage, center-tap positive terminal configuration, 6.0 °C/W junction-to-case thermal resistance, and RoHS-compliant matte tin terminations.
Technical Context
This device integrates two series-connected diode legs sharing a common center-tap anode (–), with cathodes marked (+) and AC terminals. Its aluminum case provides electrical isolation and direct heatsinking, enabling conduction at up to 150 °C junction temperature under forced-air or chassis-mount cooling.
The 681-4 operates with a maximum forward voltage of 1.2 V per leg at 10 A and exhibits ≤200 µA reverse leakage at 100 °C and VRWM - critical for maintaining efficiency in high-temperature rectification stages where thermal derating must be managed per Figure 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 400 V - maximum continuous reverse voltage before breakdown; defines safe AC input range in bridge or center-tap configurations |
| IO @ TC = 55 °C | 15 A - max average DC output current with case temperature held at 55 °C; requires adequate heatsinking |
| IFSM | 150 A - nonrepetitive surge rating; supports inrush current handling during power-up without failure |
| RθJC | 6.0 °C/W - thermal resistance from junction to case; enables direct thermal interface to heatsink or chassis |
| VF @ 10 A | 1.2 V per leg - forward drop determines conduction loss and heat generation in high-current operation |
| TJ Range | –65 to +150 °C - wide operating junction temperature range suitable for industrial environments |
Pinout & Package
Package: Aluminum case with electrically isolated mounting surface; terminals are matte tin (RoHS compliant); weight ≈30 g; mechanical outline per Page 6 (D = 2.24–2.26 in / 56.9–57.4 mm, E = 1.87–1.88 in / 47.5–47.75 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC (1) | Alternating current input | One AC input terminal; used with second AC terminal to feed transformer secondary |
| AC (2) | Alternating current input | Second AC input terminal; symmetrical with AC (1) for center-tapped transformer connection |
| + | Cathode (positive output) | Positive DC output node; connects to load or filter capacitor anode |
| – | Center-tap anode (negative reference) | Common anode node; serves as circuit ground or negative rail reference point |
Key Features
| Feature | Design Value |
|---|---|
| Electrically isolated aluminum case | Enables direct mounting to grounded heatsinks without insulation hardware, reducing thermal impedance and system cost |
| Controlled avalanche characteristics | Allows safe energy absorption during transient overvoltage events without destructive failure |
| 150 °C junction rating | Supports operation in high-ambient-temperature enclosures such as motor control cabinets or enclosed power systems |
| RoHS-compliant matte tin terminations | Ensures lead-free solder compatibility and long-term reliability in modern assembly processes |
Applications
| Industrial Power Supplies | Motor Drive Front-Ends |
|---|---|
Use Scenario: High-efficiency AC/DC conversion in DIN-rail mounted 3 kW power supplies for factory automation. IC Role / Device Role / Timing Role: Center-tap rectifier providing dual-polarity DC rails with shared thermal path via aluminum case. Use Value: 15 A IO rating and 6.0 °C/W RθJC enable compact thermal design without forced air, reducing system fan count and noise. | Use Scenario: Rectification of transformer-isolated AC bus in servo amplifier input stages. IC Role / Device Role / Timing Role: Standard-recovery rectifier converting 3-phase-derived single-phase AC into stable DC link voltage. Use Value: Controlled avalanche behavior absorbs regenerative energy spikes during rapid deceleration, improving system robustness. |
| Uninterruptible Power Systems | Welding Equipment Power Stages |
Use Scenario: Battery-charging rectification in line-interactive UPS units with active power factor correction bypass. IC Role / Device Role / Timing Role: Primary rectifier in offline charging path, operating continuously at elevated ambient temperatures. Use Value: –65 to +150 °C TJ range ensures reliable operation during extended battery float charge cycles in warm server rooms. | Use Scenario: High-current DC supply generation in arc welding inverters with transformer-isolated inputs. IC Role / Device Role / Timing Role: Center-tap configured rectifier delivering low-ripple DC to IGBT gate drivers and control logic rails. Use Value: 150 A IFSM withstands repetitive short-circuit surges inherent in welding duty cycles without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-15EWH04 | Single-diode TO-247 package; 400 V VRWM, 15 A IO, but no center-tap configuration or aluminum case isolation | Requires external center-tap wiring and insulated mounting; higher thermal resistance (RθJC = 1.5 °C/W but needs insulator) | Choose when board-level integration and discrete layout flexibility outweigh thermal/mechanical advantages of 681-4 |
| IXYS MBR1545CT | Schottky center-tap TO-220AC; 45 V VRWM, 15 A IO, lower VF (~0.55 V), but not rated for 400 V or 150 °C operation | Only suitable for low-voltage, high-efficiency DC-DC front-ends; cannot replace 681-4 in 400 V AC line applications | Choose only for <50 V DC input systems where ultra-low forward drop is prioritized over voltage rating and temperature capability |
Compared with VS-15EWH04 and MBR1545CT, the 681-4 uniquely combines 400 V rating, center-tap positive configuration, electrically isolated aluminum packaging, and 150 °C junction capability - making it irreplaceable in thermally constrained, high-voltage industrial rectification where mechanical integration and surge resilience are mandatory.
Availability
681-4 is available at Aetrix Electronics and suitable for industrial power supplies, motor drive front-ends, and uninterruptible power systems requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for 681-4 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
Microsemi Corporation (now part of Microchip Technology) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 681(e3) series was developed specifically for ruggedized, high-current AC/DC conversion in harsh-environment power systems where thermal management, electrical isolation, and surge survivability are critical.
FAQ
What is the maximum working peak reverse voltage (VRWM) of the 681-4?
The 681-4 has a VRWM of 400 V, meaning it can safely block up to 400 V of continuous reverse voltage across each diode leg. This value is confirmed in the "PART NUMBER" table on Page 3 of RF01151 Rev A and corresponds to the "-4" suffix in the nomenclature. Exceeding this voltage risks breakdown and permanent damage to the 681-4.
Does the 681-4 have a center-tap positive or center-tap negative configuration?
Per the PART NOMENCLATURE section on Page 2, the "P" suffix in 681-4 indicates center-tap positive configuration. The "+" terminal is the common cathode output, while "–" is the center-tap anode. This configuration is explicitly defined for the 681-4 in the marking description and mechanical diagrams.
What is the forward voltage drop of the 681-4 at rated current?
The 681-4 exhibits a maximum forward voltage of 1.2 V per leg at 10 A and 25 °C, as specified in the ELECTRICAL CHARACTERISTICS table on Page 3. This VF value directly impacts conduction losses and thermal design - for example, at 10 A, each leg dissipates 12 W, requiring appropriate heatsinking to maintain TJ ≤ 150 °C.
Is the 681-4 RoHS compliant?
Yes, the "e3" suffix in 681-4 confirms RoHS compliance per the PART NOMENCLATURE table on Page 2. Its terminations use matte tin plating instead of tin/lead, satisfying EU Directive 2011/65/EU. This is further supported by the FEATURES list stating "RoHS compliant versions available" and the absence of lead in the terminal materials description.
What is the thermal resistance from junction to case (RθJC) for the 681-4?
The 681-4 has a junction-to-case thermal resistance of 6.0 °C/W, as listed under MAXIMUM RATINGS on Page 1. This low value results from its aluminum case construction and direct metal-to-metal thermal path, enabling efficient heat transfer to an external heatsink or chassis - a key advantage over plastic-packaged alternatives.
681-4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- ND
- Packaging:
- Bulk
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Series Connection
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io) (per Diode):
- 15A
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 10 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 10 µA @ 400 V
- Operating Temperature - Junction:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis Mount
- Supplier Device Package:
- ND
681-4 FAQ
1.How can I place an order for 681-4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 681-4 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 681-4 reliable?
The price and inventory of 681-4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 681-4 is usually 5 days.
3.What payment methods are accepted for 681-4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 681-4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 681-4?
681-4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 681-4 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 681-4?
For technical support, including 681-4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 681-4 requirements.
6.How does Aetrix verify that 681-4 is sourced from the original manufacturer or authorized distributors?
All 681-4 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 681-4 meets industry standards.
7.What is the process for return or replacement of 681-4?
All 681-4 units undergo pre-shipment inspection (PSI). If there is an issue with 681-4, 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 681-4 part is unused and in its original packaging.
Return procedure for 681-4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
681-4 Tags
-
BAV99-7-F
Diodes Incorporated
-
BAT54C-7-F
Diodes Incorporated
-
BAV99,215
Nexperia USA Inc.
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BAT54SLT1G
onsemi
-
BAV70LT1G
onsemi
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BAT54CLT1G
onsemi
-
BAT54S-7-F
Diodes Incorporated
-
BAV99LT1G
onsemi
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BAT54S,215
Nexperia USA Inc.
-
BAS40-04LT1G
onsemi
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MMBD1503-TP
Micro Commercial Co
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BAV99WT1G
onsemi
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