US2BB-HF Equivalent & Substitute Parts

Part Overview

The US2BB-HF is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 100 V DC reverse voltage and 2 A average rectified current in a surface mount SMB/DO-214AA package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 2 A
Reverse Recovery Time (trr)	50	ns
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the US2BB-HF with the UF2B_R1_00001 is based on strict equivalence of the following critical electrical and mechanical parameters:

Voltage Rating: Both parts rated at 100 V DC reverse voltage (Vr)
Current Rating: Both parts rated at 2 A average rectified current (Io)
Forward Voltage: Both parts specified at 1 V maximum forward voltage at 2 A
Recovery Speed: Both parts classified as Fast Recovery with ≤ 500ns recovery time and > 200mA (Io) threshold
Reverse Recovery Time: Both parts specified at 50 ns (trr)
Package Compatibility: Both parts use DO-214AA/SMB surface mount package
Mounting Type: Both parts are surface mount components
Temperature Range: Both parts operate across -55°C to 150°C junction temperature
Compliance: Both parts are RoHS3 compliant and carry EAR99 ECCN classification

Parameter Comparison

Parameter	US2BB-HF (Comchip)	UF2B_R1_00001 (Panjit)	Match Status
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	Equivalent
Current - Average Rectified (Io)	2 A	2 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1 V @ 2 A	1 V @ 2 A	Equivalent
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
Reverse Recovery Time (trr)	50 ns	50 ns	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 100 V	1 µA @ 100 V	UF2B_R1_00001 Superior
Capacitance @ Vr, F	20 pF @ 4V, 1MHz	28 pF @ 4V, 1MHz	Variation Within Tolerance
Package / Case	DO-214AA, SMB	DO-214AA, SMB	Equivalent
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

Both the US2BB-HF and UF2B_R1_00001 are Active product status components with full RoHS3 compliance and EAR99 ECCN classification. Selection between these parts is determined by availability and application-specific requirements:

US2BB-HF (Comchip Technology) is selected when Comchip sourcing is specified or preferred, with 762 pieces currently in stock.

UF2B_R1_00001 (Panjit International Inc.) is selected as a parametric equivalent when Panjit sourcing is acceptable or when higher inventory availability is required, with 1586 pieces currently in stock. This part demonstrates lower reverse leakage current (1 µA versus 5 µA at 100 V), which may provide performance advantages in low-leakage applications.

Both parts meet identical electrical specifications for voltage, current, recovery time, and temperature range. Package compatibility is confirmed for direct PCB footprint substitution in DO-214AA/SMB surface mount applications.

Frequently Asked Questions (FAQ)

Q: Can UF2B_R1_00001 be used as a direct replacement for US2BB-HF on the PCB?

A: Yes. Both parts use the identical DO-214AA/SMB surface mount package with equivalent pinout and footprint. No PCB layout modifications are required.

Q: Are there electrical performance differences between these parts?

A: The primary electrical difference is reverse leakage current: UF2B_R1_00001 specifies 1 µA at 100 V compared to 5 µA for US2BB-HF. All other critical parameters—voltage rating, current rating, forward voltage, recovery time, and temperature range—are identical.

Q: Do both parts meet the same compliance standards?

A: Yes. Both US2BB-HF and UF2B_R1_00001 are RoHS3 compliant, carry EAR99 ECCN classification, and have MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the difference in capacitance between these parts?

A: US2BB-HF specifies 20 pF at 4V, 1MHz, while UF2B_R1_00001 specifies 28 pF at the same conditions. This 8 pF variation is within typical manufacturing tolerance for general-purpose rectifier diodes and does not affect standard rectification applications.

Q: Which part should be selected for new designs?

A: Selection is based on supply chain strategy and inventory availability. Both parts are Active status and fully equivalent for the specified electrical and mechanical parameters. UF2B_R1_00001 offers higher current inventory (1586 pieces versus 762 pieces).

Q: Are there temperature range limitations for either part?

A: No. Both parts operate across the identical junction temperature range of -55°C to 150°C with no derating required within this range.

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