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Product Overview
MUR3040CL integrates two 15A fast-recovery junctions in a positive-tandem TO-220AB arrangement. Its 400V device rating and accessible AK midpoint suit clamp and commutation circuits that require this diode direction.
Each internal diode is rated at 15A. The 30A total device figure does not establish a 30A series-path rating, and the two junctions must not be presented as an automatically doubled blocking-voltage rating.
Key Features
● 400V repetitive peak reverse voltage and two 15A diode paths.
● 50ns maximum reverse-recovery time under the specified 0.5A test condition.
● 1.3V maximum forward voltage at 15A and 25°C.
● 250A non-repetitive surge current for a 8.3ms pulse.
Key Specifications
| Parameter | Value and conditions |
| Configuration / package | Positive tandem dual diode / TO-220AB |
| Forward current | 30A per device; 15A per diode |
| Repetitive peak reverse voltage | 400V |
| Forward voltage | 0.95V typ at IF = 15A, Tj = 125°C 1.3V max at IF = 15A, Tj = 25°C |
| Reverse recovery time | 50ns max; Tj = 25°C, IF = 0.5A, IR = 1.0A, Irr = 0.25A |
| Surge current | 250A; non-repetitive, t = 8.3ms |
| Junction to case thermal resistance | 2.0°C/W |
| Junction temperature range | −55°C to +150°C |
Current and thermal limits must be evaluated for the complete assembly. IFSM is a non-repetitive pulse rating, not a repetitive operating-current rating.
Electrical Configuration and Pinout
With the marking face toward you and the leads pointing down, the leads are K, AK and A from left to right. The center AK connection is the junction between the two series diode paths. The metal tab is connected to this midpoint.
Figure 1. Circuit and connection detail from the MUR3040CL datasheet, page 1. A = anode; K = cathode.
| Connection | Function |
| Left lead | K — outer cathode |
| Center lead | AK — intermediate anode/cathode node |
| Right lead | A — outer anode |
| Metal tab | AK — electrically connected to the midpoint |
Typical Applications
● Converter clamp cells.
● Polarity-specific commutation networks.
● Two-diode steering circuits with an accessible midpoint.
An Accessible Midpoint for Tandem Rectification
The left lead is K, the center lead is AK and the right lead is A. The two junctions form a directed series chain with an accessible midpoint, which distinguishes CL from common-anode, common-cathode and opposite-tandem connections.
Design Notes
Evaluate each diode at its own current waveform and duty cycle. The 30A total device rating does not mean one junction can carry 30A. Check reverse-voltage peaks, including switching transients, against the 400V rating.
The intermediate node and metal tab share the same potential. Do not add the two 400V junction ratings and describe the device as an 800V rectifier; series operation requires control of voltage sharing and the current in each junction.
The 50ns recovery limit uses the low-current test condition in the parameter table. Evaluate recovery at the application current and temperature. The 250A surge specification is non-repetitive and must not be used as a repetitive overload rating.
FAQ
It is the specific internal series orientation shown in the MUR3040CL circuit symbol. Use the drawing to map each external pin and the common AK tab node.
No. CA, CL, CR, and CT devices can share electrical headline ratings while connecting the internal diodes differently.
They share one footprint and thermal interface, which can shorten current loops when the internal orientation matches the circuit.
Use the current MUR3040CL datasheet and confirm pin numbers, tab potential, and mechanical tolerances with the supplier before release.
