Name: /Tools-Info/Her208 Mdd
Brand: EstiSource
Availability: InStock

HER208 MDD

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HER208 MDD

Introduction
Material Composition
Manufacturing Process
Challenges and Limitations
Costing
Properties and Characteristics
Frequently asked questions
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One Click Product Costing

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HER208 High-Efficiency Rectifier Diode – MDD

is a high-efficiency, ultra-fast recovery rectifier diode manufactured by MDD (Mingda Diodes). It is designed to provide efficient rectification in high-speed switching applications, such as SMPS (switched-mode power supplies), inverters, and DC-DC converters. Rated for 2A forward current and a reverse voltage of 800V, this axial-lead diode features rapid reverse recovery characteristics that help reduce switching losses in high-frequency circuits.

This diode is part of the HER200 series, optimized for applications demanding both high breakdown voltage and quick switching response, making it a go-to solution for power electronics engineers focused on thermal and energy efficiency.

How EstiSource Helps

EstiSource supports design and sourcing teams by streamlining the acquisition of critical components like the HER208 High-Efficiency Rectifier Diode. From real-time cost insights and alternate part recommendations to trusted supplier links and availability alerts, our platform ensures engineers and buyers reduce procurement time and cost, especially when dealing with high-efficiency rectifier diodes.

Why Choose EstiSource for Sourcing

At EstiSource, we don't just offer pricing — we deliver component clarity and sourcing certainty. With tools designed for engineers, procurement teams, and entrepreneurs, we empower you to evaluate, validate, and procure parts like HER208 with full market transparency. No delays, no fake parts — just real-time estimates, trusted suppliers, and smarter cost control.

1. Material Composition

▶

HER208 diodes are composed of the following primary materials:

Silicon Die: The active PN junction is made from doped monocrystalline silicon using high-purity diffusion techniques.
Copper Leads: Tin-plated copper or copper-clad steel provides mechanical and electrical connectivity.
Glass Passivation Layer: A thin layer of borosilicate glass enhances voltage standoff and environmental resistance.
Encapsulation: Molded epoxy resin encapsulates the assembly, offering thermal insulation and mechanical protection.
Bonding Materials: Silver-based conductive adhesives or solder alloys are used for internal die-attach connections.

2. Manufacturing Process

▶

Wafer Processing: Silicon wafers are doped and etched to form the PN junctions.
Die Separation & Testing: Individual diodes are diced, tested, and binned by electrical performance.
Die Attach: The die is affixed to axial leads using conductive epoxy or solder.
Glass Passivation: A thin glass coating is applied to ensure high-voltage insulation and durability.
Molding: The diode is encapsulated using epoxy resin in an axial package format.
Lead Trimming & Plating: Leads are trimmed to uniform lengths and plated for improved solderability.
Final QA Testing: Each unit is tested for breakdown voltage, leakage, forward voltage drop, and recovery time.

3. Challenges & Limitations

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Thermal Dissipation

Axial leaded diodes like HER208 rely on PCB design and ambient airflow for thermal dissipation.

Manual Assembly Risk

In high-volume surface-mount environments, axial components may increase handling complexity.

Fake or Remarked Parts

Common in open markets, especially when the diode markings are generic.

Voltage Headroom

While 800V is sufficient for many designs, systems with higher surge requirements may need alternatives.

Sourcing in Bulk

Leaded components are slowly being replaced by SMD equivalents in large-scale automation setups.

4. Costing

▶

Unit Cost (Bulk B2B MOQ 1,000+): ₹1.60 – ₹2.20 per unit depending on batch size and origin.
Small Quantities (B2C): ₹3 – ₹6 per piece in retail or lab-use packs.

Sourcing Factors:

Country of origin (China/Taiwan vs. India local stock)
Brand (MDD vs. Vishay or ON Semi equivalents)
Packing format (bulk vs. tape-and-reel)

Hidden Costs:

Quality assurance for high-reliability circuits
Substitute validation if out-of-stock

5. Properties & Characteristics

▶

Maximum Repetitive Reverse Voltage

800V

Average Forward Current

Forward Voltage Drop (V_F)

~1.3V at rated current

Reverse Recovery Time

~75ns (Ultra-Fast Recovery)

Operating Temperature Range

-65°C to +150°C

Mounting Type

Axial Leaded

Package Type

DO-15

Polarity

Unidirectional

Compliance

RoHS Compliant

6. Frequently Asked Questions

▶

Q1: What makes HER208 better than general-purpose diodes like 1N5408?

It's designed for high-speed switching and recovers faster after reverse bias, reducing switching losses.

Q2: Can HER208 be used for AC line rectification?

Yes, especially in circuits up to 800V reverse voltage and 2A forward current, such as chargers and offline SMPS.

Q3: Are there surface-mount equivalents to HER208?

Yes, such as ES2G or MURS260 in SMB/DO-214 packages for SMT applications.

Q4: Is HER208 good for inverter boards?

Yes, it's well-suited for high-frequency inverter and flyback topologies due to its fast recovery time.

Q5: What are typical replacements for HER208?

Similar specs are found in UF4007, HER308 (higher amp), and MUR420 depending on voltage/current needs.

Precision in every estimate, excellence in Service.

HER208 MDD

One Click Product Costing

1. Material Composition

2. Manufacturing Process

3. Challenges & Limitations

Thermal Dissipation

Manual Assembly Risk

Fake or Remarked Parts

Voltage Headroom

Sourcing in Bulk

4. Costing

5. Properties & Characteristics

Maximum Repetitive Reverse Voltage

Average Forward Current

Forward Voltage Drop (VF)

Reverse Recovery Time

Operating Temperature Range

Mounting Type

Package Type

Polarity

Compliance

6. Frequently Asked Questions

Forward Voltage Drop (V_F)