US2BA Equivalent & Substitute Parts

Part Overview

The US2BA is a general-purpose rectifier diode manufactured by onsemi, rated for 100 V DC reverse voltage and 1.5 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary for ongoing production support, field replacements, and design migration to active alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1.5 A	V @ A
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitute parts for the US2BA are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical electrical specifications (100 V reverse voltage, 1.5 A current rating, fast recovery characteristics, and identical forward voltage drop). These parts are direct functional replacements with no circuit redesign required.

Functional Substitutes share the same package (DO-214AC/SMA) and voltage rating (100 V) but differ in current rating or recovery characteristics. These parts are suitable for applications where the higher current capability or different recovery speed does not create circuit conflicts.

Substitution eligibility is determined by the following criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 100 V
Package / Case: Must be DO-214AC or SMA
Mounting Type: Must be Surface Mount
Current - Average Rectified (Io): Must meet or exceed application requirements
Operating Temperature Range: Must encompass the application's thermal requirements

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V @ A]	trr [ns]	Ir @ Vr [µA @ V]	Speed	Package	Product Status
US2BA	onsemi	100	1.5	1 @ 1.5	50	5 @ 100	Fast Recovery ≤ 500ns	DO-214AC (SMA)	Not For New Designs
HS2BA	Taiwan Semiconductor Corporation	100	1.5	1 @ 1.5	50	5 @ 100	Fast Recovery ≤ 500ns	DO-214AC (SMA)	Active
HS2BA R3G	Taiwan Semiconductor Corporation	100	1.5	1 @ 1.5	50	5 @ 100	Fast Recovery ≤ 500ns	DO-214AC (SMA)	Discontinued at DiGi Electronics
S1B-E3/5AT	Vishay General Semiconductor - Diodes Division	100	1	1.1 @ 1	1800	1 @ 100	Standard Recovery > 500ns	DO-214AC (SMA)	Active
BYG22B-E3/TR	Vishay General Semiconductor - Diodes Division	100	2	1.1 @ 2	25	1 @ 100	Fast Recovery ≤ 500ns	DO-214AC (SMA)	Active
MURA210T3G	onsemi	100	2	940 mV @ 2	30	2 @ 100	Fast Recovery ≤ 500ns	DO-214AC (SMA)	Active

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

The HS2BA and HS2BA R3G are parametric equivalents to the US2BA, offering identical electrical specifications across all critical parameters. The HS2BA is the preferred selection as it maintains Active product status. Both parts are manufactured by Taiwan Semiconductor Corporation and comply with ROHS3, REACH Unaffected, and EAR99 classifications. The HS2BA is suitable for new production and field replacement applications without circuit modification.

For Functional Substitution (Higher Current Rating):

The MURA210T3G (onsemi) and BYG22B-E3/TR (Vishay) provide 2 A current capability while maintaining the 100 V voltage rating and DO-214AC package. These parts are appropriate for applications where the US2BA's 1.5 A rating is marginal or where design margin improvement is desired. Both are Active products with full compliance certifications. The MURA210T3G offers lower forward voltage (940 mV @ 2 A) and faster recovery time (30 ns), while BYG22B-E3/TR employs avalanche technology with the fastest recovery time (25 ns).

For Current-Limited Applications:

The S1B-E3/5AT (Vishay) provides a 1 A rating, suitable only for applications where the circuit current requirement is 1 A or less. This part exhibits standard recovery characteristics (1.8 µs) rather than fast recovery, making it unsuitable for high-frequency switching applications. Selection of this part requires verification that the application's current demand does not exceed 1 A.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 classification, matching the original US2BA. All parts feature Moisture Sensitivity Level 1 (Unlimited), eliminating moisture-related handling constraints.

Frequently Asked Questions (FAQ)

Q: Can the HS2BA directly replace the US2BA without circuit modification?

A: Yes. The HS2BA is a parametric equivalent with identical voltage rating (100 V), current rating (1.5 A), forward voltage drop (1 V @ 1.5 A), and recovery characteristics (50 ns). No circuit redesign is required. Both parts use the DO-214AC (SMA) package and operate across the same temperature range (-55°C to 150°C).

Q: What is the difference between the HS2BA and HS2BA R3G?

A: Both parts are parametrically identical with matching electrical specifications. The primary difference is packaging: HS2BA is supplied in Tape & Reel (TR) format, while HS2BA R3G is supplied in Cut Tape (CT). The HS2BA R3G is discontinued at DiGi Electronics, making the HS2BA the active alternative. Selection depends on procurement and assembly requirements.

Q: Can I use the MURA210T3G or BYG22B-E3/TR as substitutes?

A: Yes, both parts are suitable substitutes for applications where higher current capability is acceptable. Both maintain the 100 V voltage rating and DO-214AC package. The MURA210T3G provides 2 A capability with 30 ns recovery time, while BYG22B-E3/TR provides 2 A capability with 25 ns recovery time using avalanche technology. These parts are appropriate for designs requiring additional current margin or for applications where the original 1.5 A rating is insufficient.

Q: Why is the S1B-E3/5AT listed as a substitute if it has lower current rating?

A: The S1B-E3/5AT is listed as a functional substitute for applications where the circuit current requirement does not exceed 1 A. It maintains the 100 V voltage rating and DO-214AC package. However, this part exhibits standard recovery characteristics (1.8 µs) rather than fast recovery, making it unsuitable for high-frequency switching circuits. Use of this part requires confirmation that the application's current demand is 1 A or less and that standard recovery speed is acceptable.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts listed use the DO-214AC (SMA) surface mount package, ensuring mechanical and footprint compatibility. Packaging format (Tape & Reel versus Cut Tape) varies by part number and supplier, but the physical component package remains identical.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 classification. All parts feature Moisture Sensitivity Level 1 (Unlimited), eliminating moisture-related handling and storage constraints. These certifications match the original US2BA specifications.

Q: Which substitute part should I select for new designs?

A: The HS2BA is the recommended selection for new designs, as it is a parametric equivalent with Active product status and identical electrical specifications to the US2BA. For applications requiring higher current capability or improved performance margins, the MURA210T3G (onsemi) or BYG22B-E3/TR (Vishay) are appropriate Active alternatives with 2 A ratings.

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