Product Overview
Rectron RS402L Single-Phase Bridge Rectifier - 4A 100V RS-4L Through-Hole, Unused NOS
Condition
Unused NOS. Sourced from an electronics distributor consolidating inventory. Lead legs show light tarnish from age - cleans up nicely. Markings legible: Rectron logo, RS402L part number, and pin polarity identifiers (+, -, AC, AC) molded on the body. Evaluate suitability before use.
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Product Overview
Rectron RS402L - a silicon single-phase full-wave bridge rectifier in the RS-4L through-hole 4-pin SIP package with integrated mounting hole. Rated 4.0A average rectified forward output current and 100V maximum repetitive peak reverse voltage. Converts AC to DC in a compact, board-mount footprint with stamped terminal polarity markings for straightforward installation.
Key Features
- Maximum repetitive peak reverse voltage (VRRM): 100V
- Average rectified forward output current (IO): 4.0A
- Peak forward surge current (IFSM): 150A (8.3ms single half sine-wave)
- Maximum forward voltage drop (VF): 1.1V per diode at 4.0A
- Operating temperature range: -55°C to +150°C
- Package: RS-4L through-hole 4-pin SIP with integrated mounting hole
- Pin polarity marked on body: +, -, AC, AC
- Glass passivated silicon construction
Applications
- Repair tech replacing a failed bridge rectifier in a vintage amplifier or appliance power supply - desolder the faulty unit, drop in the RS402L, match the polarity markings, solder, done
- Hobbyist wiring up a custom AC-to-DC bench supply or perfboard power stage where discrete diodes would mean four parts and extra real estate
- Small-batch builder assembling a low-voltage DC power rail that needs a reliable, standard-footprint rectifier without hunting for a custom solution
- Vintage electronics restorer swapping out an aging rectifier in a radio or TV chassis where the through-hole RS-4L footprint is already on the board
Frequently Asked Questions
What AC input voltage can this handle?
The RS402L is rated for a maximum repetitive peak reverse voltage of 100V. For a 60Hz AC mains application, this means the peak AC voltage across any single diode must not exceed 100V. Standard 120V RMS mains peaks at approximately 170V, which exceeds the rating - this part is suited to lower-voltage AC sources or transformer-secondary circuits within its voltage limits.
Does this need a heatsink?
At lower currents it can run without one, but at loads approaching 4.0A the integrated mounting hole lets you bolt it directly to a heatsink or chassis. Thermal management becomes important near the rated current, especially in warm enclosures.
Is the pinout marked on the part?
Yes. The body carries stamped terminal identifiers: + (DC positive), - (DC negative), and two AC input pins. The markings are legible on this unit.
What is the RS402L-BP variant, and is this it?
RS402L-BP indicates bulk packaging of the same RS402L component. This unit is the RS402L - functionally identical, same electrical specs and RS-4L package.
A bridge rectifier is one of those parts that does exactly one job and never complains about it. This one has been sitting unused since it left the distributor - ready to go back to work the moment you need it.
