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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation HER208G B0G

Name: HER208G B0G
Brand: Taiwan Semiconductor Corporation
SKU: HER208G B0G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HER208G B0G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-204AC, DO-15, Axial

Datasheet:: HER208G B0G.pdf

Description:: DIODE GEN PURP 2A DO204AC

Quantity:: RFQ Add To RFQ list

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Inventory:7,220

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Product details

Overview

HER208G from Taiwan Semiconductor is a high-efficiency, glass-passivated silicon rectifier diode rated for 2 A average forward current and 1000 V repetitive peak reverse voltage, with 60 A surge capability and 1.7 V typical forward voltage at 2 A and 25°C - used in high-voltage DC-DC converters and switching inverters.

For engineers reviewing the HER208G datasheet, HER208G pinout, HER208G application, or HER208G equivalent, key selection criteria include verified V_RRM = 1000 V, I_F = 2 A, t_rr = 75 ns, R_θJA = 60 °C/W, and DO-204AC (DO-15) package compatibility with standard through-hole power layouts.

Technical Context

This device is a single-die, ultra-fast recovery rectifier optimized for high-frequency switching applications where low conduction loss and controlled reverse recovery are critical. Its 75 ns reverse recovery time and 20 pF junction capacitance support efficient operation in SMPS topologies above 50 kHz.

The HER208G features glass passivation for enhanced reliability under thermal cycling and humidity stress, and meets RoHS and halogen-free requirements per IEC 61249-2-21 - making it suitable for automotive-grade designs when ordered with AEC-Q101 qualification (e.g., HER208GH).

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1000 V - supports primary-side rectification in offline 800 V AC-input SMPS without derating
I_F	2 A continuous - delivers stable output in compact 15–30 W DC-DC modules
I_FSM	60 A (8.3 ms half-sine) - withstands inrush surges in industrial power supplies
t_rr	75 ns - reduces switching losses and EMI in 100–500 kHz converters
V_F	1.7 V typ @ 2 A, 25°C - enables <1.5 W conduction loss at full load
R_θJA	60 °C/W - requires minimal heatsinking on FR-4 PCBs with 1-in² copper pour
Junction temp	−55°C to +150°C - operates reliably in under-hood automotive environments

Pinout & Package

HER208G is housed in a DO-204AC (DO-15) axial-leaded package with cathode indicated by a band; leads are pure tin-plated and J-STD-002 solderable.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry	Connected to lower-potential side (e.g., transformer secondary center-tap or switch node)
Cathode	Forward current exit / reverse blocking terminal	Marked with band; ties to output rail or filter capacitor positive; blocks 1000 V in reverse bias

Key Features

Feature	Design Value
Glass-passivated junction	Prevents moisture-induced degradation and improves long-term stability in humid environments
Ultra-fast recovery (75 ns)	Minimizes reverse recovery charge (Q_rr) and associated switching losses in high-frequency converters
Low V_F (1.7 V)	Reduces conduction loss by ~15% vs. standard FR-type rectifiers at 2 A, improving efficiency in 12–24 V outputs
AEC-Q101 qualified option	HER208GH variant available for automotive power modules requiring stress-tested reliability
Halogen-free & RoHS	Complies with IEC 61249-2-21 and EU RoHS Directive for green manufacturing and end-of-life handling

Applications

Industrial SMPS	Automotive DC-DC Converter
Use Scenario: 24 V input, 5 V/2 A isolated output in factory automation PLC power supply. IC Role / Device Role / Timing Role: Primary-side high-voltage rectifier converting transformer secondary AC to DC bus. Use Value: 1000 V V_RRM provides 2× safety margin over 400 V reflected transients; 75 ns t_rr cuts EMI filtering cost.	Use Scenario: 12 V battery-fed 3.3 V/1.5 A buck-boost converter for ADAS camera module. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous rectified topology during low-side switch off-time. Use Value: 1.7 V V_F limits dropout and thermal rise under 100% duty-cycle transient loads.
LED Driver Power Stage	UPS Inverter Output Stage
Use Scenario: Constant-current LED driver with 300 V DC bus feeding multi-string parallel topology. IC Role / Device Role / Timing Role: Output rectifier in flyback secondary, handling 2 A continuous and 60 A surge during lamp strike. Use Value: 60 A I_FSM prevents failure during cold-start inrush; DO-15 package fits legacy LED driver footprints.	Use Scenario: 48 V DC input to 230 V AC line-frequency inverter in small commercial UPS. IC Role / Device Role / Timing Role: Bridge leg freewheeling diode clamping inductive kickback from H-bridge MOSFETs. Use Value: 150 µA max reverse leakage at 125°C ensures minimal standby loss; 150°C T_JMAX sustains operation during overload.

Industrial SMPS

Automotive DC-DC Converter

Use Scenario: 24 V input, 5 V/2 A isolated output in factory automation PLC power supply.

IC Role / Device Role / Timing Role: Primary-side high-voltage rectifier converting transformer secondary AC to DC bus.

Use Value: 1000 V V_RRM provides 2× safety margin over 400 V reflected transients; 75 ns t_rr cuts EMI filtering cost.

Use Scenario: 12 V battery-fed 3.3 V/1.5 A buck-boost converter for ADAS camera module.

IC Role / Device Role / Timing Role: Freewheeling diode in synchronous rectified topology during low-side switch off-time.

Use Value: 1.7 V V_F limits dropout and thermal rise under 100% duty-cycle transient loads.

LED Driver Power Stage

UPS Inverter Output Stage

Use Scenario: Constant-current LED driver with 300 V DC bus feeding multi-string parallel topology.

IC Role / Device Role / Timing Role: Output rectifier in flyback secondary, handling 2 A continuous and 60 A surge during lamp strike.

Use Value: 60 A I_FSM prevents failure during cold-start inrush; DO-15 package fits legacy LED driver footprints.

Use Scenario: 48 V DC input to 230 V AC line-frequency inverter in small commercial UPS.

IC Role / Device Role / Timing Role: Bridge leg freewheeling diode clamping inductive kickback from H-bridge MOSFETs.

Use Value: 150 µA max reverse leakage at 125°C ensures minimal standby loss; 150°C T_JMAX sustains operation during overload.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH2R06	V_RRM = 600 V, t_rr = 65 ns, V_F = 1.7 V @ 2 A - lower voltage rating, slightly faster recovery	Suitable only for ≤600 V systems; not drop-in for 1000 V designs	Select if system peak reverse stress is confirmed ≤600 V and faster t_rr is prioritized over voltage margin
ES2J (ON Semi)	V_RRM = 600 V, I_F = 2 A, t_rr = 35 ns, V_F = 1.7 V - faster but lower voltage; SMD SMB package	Requires PCB redesign (SMD vs. axial DO-15); unsuitable for high-surge legacy designs	Choose for space-constrained, high-frequency SMD layouts where 600 V rating suffices and layout change is acceptable

Compared with STTH2R06 and ES2J, HER208G uniquely delivers 1000 V blocking with axial DO-15 mechanical robustness and 60 A surge tolerance - essential for industrial and off-line AC-DC where voltage margin and mechanical reliability outweigh speed optimization.

Availability

HER208G is available at Aetrix Electronics and suitable for industrial SMPS, automotive DC-DC converters, and LED driver power stages requiring stable component supply across extended production lifecycles.

Supply support for HER208G 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power rectifiers, TVS diodes, and MOSFETs since 1979.

The HER20xG series was developed specifically for high-efficiency, high-reliability AC-DC and DC-DC conversion in industrial and automotive power supplies - emphasizing ruggedness, thermal stability, and consistent fast-recovery performance.

FAQ

What is the maximum junction temperature rating for HER208G?

The HER208G has a maximum junction temperature (T_JMAX) of +150°C, enabling reliable operation in high-ambient environments such as enclosed industrial enclosures or under-hood automotive locations. This rating is validated per JEDEC standards and supported by its 60 °C/W junction-to-ambient thermal resistance. Derating curves in the HER208G datasheet confirm usable current capacity down to 1.2 A at 100°C ambient.

Does HER208G have AEC-Q101 qualification?

The standard HER208G is not AEC-Q101 qualified; however, the HER208GH variant - identical in electrical and thermal specs but with added automotive stress testing - is qualified per AEC-Q101. Customers requiring automotive-grade assurance must specify HER208GH, which carries the same DO-204AC package and marking format with an "H" suffix.

What is the reverse recovery time (t_rr) of HER208G and how is it measured?

The HER208G has a typical reverse recovery time (t_rr) of 75 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A per JEDEC test method. This value reflects its ultra-fast recovery behavior, critical for minimizing switching losses in high-frequency SMPS designs operating above 100 kHz.

Can HER208G replace HER207G in a design?

Yes, HER208G can directly replace HER207G (800 V) in most cases due to identical package, pinout, and thermal characteristics - while providing higher 1000 V reverse voltage margin. No layout or thermal changes are needed, though designers should verify that increased V_RRM does not inadvertently raise cost or alter snubber design assumptions in sensitive high-voltage circuits.

What is the junction capacitance (C_J) of HER208G and why does it matter?

The HER208G exhibits a typical junction capacitance (C_J) of 20 pF at 4.0 V reverse bias and 1 MHz. This low capacitance minimizes displacement current during switching transitions, reducing EMI generation and gate-drive loading in high-frequency converter designs - especially important in flyback and LLC resonant topologies where diode capacitance interacts with transformer leakage inductance.

HER208G B0G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-204AC, DO-15, Axial

Packaging:: Bulk

Product Status:: Discontinued at Digi-Key

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 1000 V

Current - Average Rectified (Io):: 2A

Voltage - Forward (Vf) (Max) @ If:: 1.7 V @ 2 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 75 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 1000 V

Capacitance @ Vr, F:: 20pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AC (DO-15)

Operating Temperature - Junction:: -55°C ~ 150°C

HER208G B0G FAQ

1.How can I place an order for HER208G B0G through Aetrix?

Please submit a Request for Quotation (RFQ) for HER208G B0G 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 HER208G B0G reliable?

The price and inventory of HER208G B0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER208G B0G is usually 5 days.

3.What payment methods are accepted for HER208G B0G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER208G B0G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HER208G B0G?

HER208G B0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HER208G B0G 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 HER208G B0G?

For technical support, including HER208G B0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER208G B0G requirements.

6.How does Aetrix verify that HER208G B0G is sourced from the original manufacturer or authorized distributors?

All HER208G B0G 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 HER208G B0G meets industry standards.

7.What is the process for return or replacement of HER208G B0G?

All HER208G B0G units undergo pre-shipment inspection (PSI). If there is an issue with HER208G B0G, 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 HER208G B0G part is unused and in its original packaging.

Return procedure for HER208G B0G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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