My Inquiry
My Account
Microchip Technology 681-3
- Part No.:
- 681-3
- Manufacturer:
- Microchip Technology
- Category:
- Diode Arrays
- Package:
- ND
- Datasheet:
-
681-3.pdf
- Description:
- DIODE MODULE GP 300V 15A ND
- Quantity:
- Payment:
- Shipping:
Inventory:9,066
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
681-3 from Microsemi is a standard recovery center-tap rectifier assembly in an electrically isolated aluminum case, rated for 300 V VRWM, 15 A average DC output current at TC = 55 °C, and 150 A non-repetitive surge current. It delivers 1.2 V forward voltage per leg at 10 A and operates up to 150 °C junction temperature, used in industrial AC/DC power supplies requiring high thermal robustness and electrical isolation.
For engineers reviewing the 681-3 datasheet, 681-3 pinout, 681-3 application, or 681-3 equivalent, key selection criteria include its center-tap positive (P) terminal configuration, 6.0 °C/W junction-to-case thermal resistance, RoHS-compliant matte tin terminals, and controlled avalanche characteristics for reliable overvoltage handling in unregulated rectification stages.
Technical Context
This device integrates two series-connected standard recovery diodes sharing a common cathode (center-tap positive), enabling full-wave rectification from a center-tapped transformer secondary. Its aluminum case provides both mechanical rigidity and thermal conduction path, with RθJC = 6.0 °C/W supporting high-power dissipation without external heatsink in moderate airflow environments.
The 681-3 exhibits controlled avalanche behavior under reverse overvoltage transients, allowing safe energy absorption without catastrophic failure. Its 300 V VRWM and 330 V minimum breakdown voltage (V(BR)) define its blocking capability in line-frequency applications where transient clamping margin is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 300 V - Peak reverse voltage the device blocks continuously without breakdown |
| IO @ TC = 55 °C | 15 A - Maximum average DC output current sustainable with case temperature held at 55 °C |
| IFSM | 150 A - Non-repetitive surge current capability for inrush or fault conditions |
| VF @ 10 A | 1.2 V per leg - Forward voltage drop determining conduction loss and thermal load per diode |
| TJ max | +150 °C - Maximum allowable junction temperature defining thermal design headroom |
| RθJC | 6.0 °C/W - Thermal resistance from junction to case, critical for heatsink sizing |
| V(BR) min | 330 V - Minimum breakdown voltage ensuring 10% margin above VRWM rating |
Pinout & Package
Package: Aluminum case with electrically isolated mounting surface; terminals: matte tin (RoHS compliant); weight ≈30 g; dimensions per RF01151 Rev A, Page 6 (D = 2.25 ±0.01 in / 57.15 ±0.25 mm, E = 1.875 ±0.005 in / 47.63 ±0.13 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 | Alternating current input (anode of leg 1) | Connects to one end of center-tapped transformer secondary |
| AC2 | Alternating current input (anode of leg 2) | Connects to opposite end of center-tapped transformer secondary |
| + | Cathode common output (center tap) | Provides positive DC output node; carries full load current in full-wave configuration |
Key Features
| Feature | Design Value |
|---|---|
| Electrically isolated aluminum case | Enables direct chassis mounting without insulating hardware while maintaining creepage/clearance safety |
| Controlled avalanche characteristics | Allows safe, repeatable energy absorption during reverse overvoltage events without parametric shift |
| 150 °C junction rating | Supports operation in high-ambient industrial enclosures without derating penalties below 100 °C ambient |
| RoHS-compliant matte tin terminals | Ensures lead-free solder compatibility and eliminates tin whisker risk in long-life deployments |
Applications
| Industrial AC/DC Power Supplies | Welding Equipment Rectifiers |
|---|---|
Use Scenario: Unregulated full-wave rectification in 50/60 Hz transformer-based power supplies for motor drives and PLC power modules. IC Role / Device Role / Timing Role: Center-tap rectifier assembly converting AC line-derived transformer output into bipolar DC bus. Use Value: 15 A IO rating and 150 A IFSM handle high inrush currents during cold-start; aluminum case dissipates heat directly to chassis. | Use Scenario: High-current DC output stage in arc welding power sources with intermittent duty cycles. IC Role / Device Role / Timing Role: Main rectifier delivering pulsed DC to welding torch; withstands repetitive surges and thermal cycling. Use Value: Controlled avalanche behavior absorbs voltage spikes from inductive load switching; 150 °C TJ rating supports sustained operation at elevated ambient temperatures. |
| Uninterruptible Power Systems (UPS) | DC Power Distribution Panels |
Use Scenario: Battery charging and bypass rectification in line-interactive UPS units with dual-path topology. IC Role / Device Role / Timing Role: Dual-leg rectifier providing redundancy and current sharing between AC input and battery backup paths. Use Value: Electrically isolated case allows independent grounding schemes for AC and DC sides; 300 V VRWM matches 230 VAC nominal input with safety margin. | Use Scenario: Centralized rectification in telecom or data center DC distribution cabinets feeding multiple sub-systems. IC Role / Device Role / Timing Role: High-current front-end rectifier converting utility AC to -48 V or +24 V DC bus. Use Value: 6.0 °C/W RθJC enables efficient thermal coupling to cabinet frame; RoHS-compliant terminals meet global compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier assembly applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-15CPH03-M3 | Same 300 V VRWM, 15 A IO, but TO-247 package with insulated tab; no aluminum case or integrated mounting | Requires external heatsink and isolation hardware; lower thermal mass than 681-3's cast aluminum housing | Prefer 681-3 when chassis-mounting, high-surge immunity, or simplified mechanical integration are required |
| IXYS MDA150A300K | 300 V VRWM, 150 A IFSM, but fast recovery (trr = 250 ns); higher VF (1.45 V @ 10 A) | Better suited for higher-frequency switching or reduced reverse recovery loss; higher conduction loss at line frequency | Choose 681-3 for cost-sensitive, line-frequency applications where low VF and avalanche ruggedness outweigh fast recovery need |
Compared with VS-15CPH03-M3 and MDA150A300K, the 681-3 offers superior thermal inertia and system-level integration via its isolated aluminum case, lower forward voltage, and proven avalanche tolerance-making it optimal for ruggedized, thermally constrained, or mechanically simplified rectifier designs.
Availability
681-3 is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, welding equipment rectifiers, and uninterruptible power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for 681-3 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) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal ICs, discrete power devices, and radiation-hardened components.
The 681(e3) series was designed specifically for high-current, line-frequency rectification in harsh-environment industrial and infrastructure applications where thermal robustness, electrical isolation, and transient survivability are critical.
FAQ
What is the terminal configuration of the 681-3?
The 681-3 uses a center-tap positive (P) configuration: two AC input terminals (AC1 and AC2) and one common cathode output terminal marked "+". This arrangement enables full-wave rectification from a center-tapped transformer secondary. The aluminum case is electrically isolated, allowing direct mounting to grounded chassis without additional insulation.
Does the 681-3 meet RoHS requirements?
Yes, the 681-3 is RoHS compliant (denoted by "e3" suffix) with matte tin-plated terminals. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE substances above threshold limits, and complies with EU Directive 2011/65/EU and subsequent amendments.
What is the maximum junction temperature rating for the 681-3?
The 681-3 has a maximum junction temperature (TJ) of +150 °C, as specified in the Absolute Maximum Ratings table. This rating enables reliable operation in high-ambient industrial environments and supports conservative thermal design margins when combined with its 6.0 °C/W junction-to-case thermal resistance.
How does the 681-3 handle reverse overvoltage transients?
The 681-3 features controlled avalanche characteristics, meaning it safely clamps reverse overvoltage transients by entering controlled avalanche breakdown rather than failing catastrophically. Its minimum breakdown voltage (V(BR)) is 330 V-10% above its 300 V VRWM rating-providing defined energy absorption capability without parametric degradation.
What is the forward voltage drop of the 681-3 at rated current?
The 681-3 exhibits a maximum forward voltage (VF) of 1.2 V per leg at 10 A and 25 °C, as specified in the Electrical Characteristics table. This value determines conduction losses and thermal loading in full-wave rectifier applications; actual VF decreases slightly at higher junction temperatures.
681-3 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):
- 300 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 @ 300 V
- Operating Temperature - Junction:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis Mount
- Supplier Device Package:
- ND
681-3 FAQ
1.How can I place an order for 681-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 681-3 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 681-3 reliable?
The price and inventory of 681-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 681-3 is usually 5 days.
3.What payment methods are accepted for 681-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 681-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 681-3?
681-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 681-3 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 681-3?
For technical support, including 681-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 681-3 requirements.
6.How does Aetrix verify that 681-3 is sourced from the original manufacturer or authorized distributors?
All 681-3 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 681-3 meets industry standards.
7.What is the process for return or replacement of 681-3?
All 681-3 units undergo pre-shipment inspection (PSI). If there is an issue with 681-3, 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 681-3 part is unused and in its original packaging.
Return procedure for 681-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
681-3 Tags
-
BAV99-7-F
Diodes Incorporated
-
BAT54C-7-F
Diodes Incorporated
-
BAV99,215
Nexperia USA Inc.
-
BAT54SLT1G
onsemi
-
BAV70LT1G
onsemi
-
BAT54CLT1G
onsemi
-
BAT54S-7-F
Diodes Incorporated
-
BAV99LT1G
onsemi
-
BAT54S,215
Nexperia USA Inc.
-
BAS40-04LT1G
onsemi
-
MMBD1503-TP
Micro Commercial Co
-
BAV99WT1G
onsemi
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
