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MB6S Bridge Rectifier- Complete Guide with FAQs

2025-06-17

The MB6S chip is a compact, highly reliable surface-mount bridge rectifier commonly use in power supply circuits to convert AC to DC. Design for printed circuit boards (PCBs), this rectifier features robust protection, low leakage current, and high surge handling capability.

In this post, we'll explore the MB6S datasheet, circuit diagram, input/output voltages, pinout, key features, and answer common questions about its use and testing.

MB6S IC

What is MB6S rectifier?

Is a glass-passivated bridge rectifier in a miniature MB package, design for Surface Mount Device (SMD) applications. Capable of converting an AC input (up to 600V) into a DC output efficiently, making it ideal for chargers, adapters, LED drivers, and power supplies.

MB6S Datasheet PDF

Similar diode bridge part number:

MB6S-TP	MB6S-E3/80
MB6S-E3/45	MB6S-G
MB6STR	RMB6S
LMB6S-TP	SLMB6S-TP

Dimension(Inches/Millimeters)

MB6S dimensions/size

Package

Packing

Quantity

TO-269AA,

4-BESOP,

4-SMD

Tape&Reel

3000pcs/reel

5000pcs/reel

MB6S Key Features

· Glass passivated die construction – for reliability and long life

· Low reverse leakage – minimizes losses

· Ideal for PCB mounting

· Surge overload rating: 30A (peak)

· UL flammability rating: 94V-0 (plastic material)

· Terminals: 100% pure tin finish

· Pb-free (RoHS compliant)

· Traceable to wafer lot

· Optional additional testing available

MB6S Circuit Diagram

Here’s a basic schematic of how it use to rectify AC into DC:

MB6S Circuit Diagram

· The AC input apply to the ~ terminals.

· The DC output take from the + and − terminals.

A smoothing capacitor often connect at the output to reduce ripple.

MB6S Pinout comes in a 4-pin MB (SMD) package:

+---------+

| |

AC~| 1 4 | AC~

DC+ | 2 3 | DC−

+---------+

Pin Functions:

· Pin 1 – AC Input (~)

· Pin 2 – DC Output (+)

· Pin 3 – DC Output (−)

· Pin 4 – AC Input (~)

This configuration allows for compact PCB design and straightforward routing of AC and DC lines.

MB6S diode bridge Electrical Specifications

Parameter	Value
Max Repetitive Reverse Voltage (V<sub>RRM</sub>)	600V
Average Rectified Output Current (I<sub>O</sub>)	0.5A
Peak Surge Current (I<sub>FSM</sub>)	30A
Forward Voltage Drop (per diode)	~1V (typical)
Operating Temperature	−55°C to +150°C

MB6S Input and Output Voltage

Input Voltage:

· Typically design for AC voltages up to 420V RMS, with a peak repetitive reverse voltage (VRRM) of 600V.

Output Voltage:

· DC output voltage is approximately:

VDC ≈ VAC × √2 − 2V

(because 2 diode drops in the full bridge path)

· For example, if input is 230V AC, output DC would be around ~324V − 2V = ~322V DC (before filtering).

Applications

· AC-DC power supplies

· LED drivers

· Battery chargers

· Home appliances

· Industrial control systems

Frequently Asked Questions (FAQ)

1. What is the use of MB6S?

Use to convert alternating current (AC) to direct current (DC) in compact electronics. Ideal for surface mount applications on PCBs, suitable for automated assembly lines. Such as power adapters, LED drivers, embedded electronics, Chargers and small appliances.

2. How do I know if my bridge rectifier is bad?

You can test if a bridge rectifier is bad using a digital multimeter (DMM) and checking for open circuits, shorts, or incorrect diode behavior.

Common symptoms of a faulty bridge rectifier:

· No Output Voltage

Input AC is present, but no DC output.

Measured output voltage is 0V or highly unstable.

· Output voltage is the same as input AC

· Physical signs: cracking, discoloration, or overheating

A failed rectifier can overheat or physically burn if it's shorted or drawing too much current. You can test with a multimeter (see FAQ 5 below) to check if any of the internal diodes are open or shorted.

3. What is the output voltage of MB6S?

The output depends on the input AC:

· For 120V AC, the DC output ≈ 170V − 2V ≈ 168V

· For 230V AC, the DC output ≈ 325V − 2V ≈ 323V

(Add filtering capacitors for smoother DC.)

4. What is the use of MB10S IC?

The MB10S is a similar bridge rectifier with higher voltage/current rating (1.5A, 1000V). Use for similar purposes as MB6S but in applications that require higher power handling.

5. How to test a rectifier with a multimeter?

Step-by-Step Diode Test Mode.

Put your multimeter to diode mode and check each diode junction:

· Place red lead on DC+ and black lead on each AC terminal; expect ~0.5–0.7V

· Reverse the leads; expect no reading

· Repeat for DC− terminal in reverse order

· Check for Shorts

Between + and – (output pins). If any reading shows 0V or infinite in both directions, the diode may shorted or open.

Tools You Need:

Digital multimeter with Diode Test Mode

Schematic (optional but helpful)

Safety gear if testing in live circuits

The MB6S bridge rectifier is a versatile and compact solution for AC to DC conversion in electronic designs. With features like glass passivation, low leakage, and SMD packaging, it offers reliable performance across many applications.

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