US2MA Equivalent & Substitute Parts

Part Overview

The US2MA is a general-purpose rectifier diode manufactured by onsemi, rated for 1000 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. The fast recovery characteristic (75 ns reverse recovery time) and automotive-grade qualification (AEC-Q101) make it suitable for power conversion and protection circuits requiring high-voltage rectification. Due to its discontinued design status, equivalent and substitute parts are necessary for ongoing production support and design continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	1000	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) Maximum @ If	1.7 V @ 1.5 A	V
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	5	µA @ 1000 V
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the US2MA are classified into three categories based on electrical and mechanical compatibility:

Direct Parametric Equivalents maintain identical electrical specifications across all critical parameters: 1000 V reverse voltage, 1.5 A average rectified current, 1.7 V forward voltage at 1.5 A, 75 ns reverse recovery time, and DO-214AC package. These parts are pin-compatible and functionally interchangeable without circuit modification.

Similar Parts share the same voltage and current ratings, package, and mounting type but differ in one or more secondary parameters such as technology type (avalanche vs. standard), forward voltage characteristics, or recovery speed classification. These parts require verification of application-specific requirements before substitution.

Limited Current Alternatives provide the same voltage rating and package but with reduced current capacity (1.0 A instead of 1.5 A). These parts are suitable only for applications where the circuit current demand does not exceed the lower rating.

The following key parameters determine substitution eligibility:

Voltage - DC Reverse (Vr) Maximum: must equal or exceed 1000 V
Current - Average Rectified (Io): must equal or exceed 1.5 A for direct equivalents
Package / Case: must be DO-214AC (SMA) for mechanical compatibility
Mounting Type: must be Surface Mount
Operating Temperature Range: must encompass -55°C to 150°C minimum

Parameter Comparison

Parameter	US2MA (Main)	NRVUS2MA	HS2MA R3G	BYG23M-E3/TR	CMR1-10M TR13	CMR1U-13M TR13
Manufacturer	onsemi	onsemi	Taiwan Semiconductor	Vishay	Central Semiconductor	Central Semiconductor
Voltage - DC Reverse (Vr) Max	1000 V	1000 V	1000 V	1000 V	1000 V	1300 V
Current - Average Rectified (Io)	1.5 A	1.5 A	1.5 A	1.5 A	1.0 A	1.0 A
Voltage - Forward (Vf) Max @ If	1.7 V @ 1.5 A	1.7 V @ 1.5 A	1.7 V @ 1.5 A	1.7 V @ 1 A	1.1 V @ 1 A	1.9 V @ 1 A
Reverse Recovery Time (trr)	75 ns	75 ns	75 ns	75 ns	Not specified	75 ns
Speed Classification	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Standard Recovery >500ns	Fast Recovery ≤ 500ns
Current - Reverse Leakage @ Vr	5 µA @ 1000 V	5 µA @ 1000 V	5 µA @ 1000 V	5 µA @ 1000 V	5 µA @ 1000 V	5 µA @ 1300 V
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-65 to 150°C	-65 to 175°C
Technology	Standard	Standard	Standard	Avalanche	Standard	Standard
Grade	Automotive	Automotive	Not specified	Not specified	Not specified	Not specified
Qualification	AEC-Q101	AEC-Q101	Not specified	Not specified	Not specified	Not specified
Product Status	Not For New Designs	Not For New Designs	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT)	Cut Tape (CT) & Digi-Reel	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

NRVUS2MA (onsemi) is the primary direct parametric equivalent. It maintains identical electrical specifications to the US2MA across all critical parameters: 1000 V reverse voltage, 1.5 A average rectified current, 1.7 V forward voltage at 1.5 A, and 75 ns reverse recovery time. Both parts carry automotive-grade qualification (AEC-Q101) and ROHS3 compliance. The NRVUS2MA is available in higher inventory (36,241 units) and is suitable for direct replacement in existing designs. Product status is "Not For New Designs," consistent with the main part.

HS2MA R3G (Taiwan Semiconductor Corporation) provides complete electrical equivalence with identical voltage, current, and recovery characteristics. It is packaged in Cut Tape format rather than Tape & Reel. This part is discontinued at DiGi Electronics, limiting long-term availability. Use is restricted to applications requiring immediate component availability from existing stock.

BYG23M-E3/TR (Vishay) is an active product with identical voltage, current, and recovery specifications. The primary distinction is technology classification (Avalanche vs. Standard). Forward voltage is specified at 1 A rather than 1.5 A. This part offers superior long-term availability and active product status. Avalanche technology provides inherent overvoltage protection, making it suitable for applications requiring transient suppression.

CMR1-10M TR13 PBFREE (Central Semiconductor Corp) and CMR1U-13M TR13 PBFREE (Central Semiconductor Corp) are limited-current alternatives with reduced average rectified current (1.0 A vs. 1.5 A). CMR1-10M maintains 1000 V rating with standard recovery characteristics. CMR1U-13M provides elevated voltage rating (1300 V) with fast recovery and extended temperature range (-65 to 175°C). Both parts are active products with robust inventory availability. These alternatives are suitable only for applications where circuit current demand does not exceed 1.0 A.

For new production requiring the US2MA specification, BYG23M-E3/TR is recommended due to active product status and superior availability. For direct replacement in existing inventory, NRVUS2MA provides identical performance with automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can NRVUS2MA be used as a direct replacement for US2MA?

A: Yes. NRVUS2MA is a direct parametric equivalent with identical voltage rating (1000 V), current rating (1.5 A), forward voltage (1.7 V @ 1.5 A), reverse recovery time (75 ns), and package (DO-214AC). Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance. No circuit modification is required.

Q: What is the difference between BYG23M-E3/TR and US2MA?

A: BYG23M-E3/TR matches US2MA in voltage (1000 V), current (1.5 A), recovery time (75 ns), and package (DO-214AC). The primary difference is technology: BYG23M-E3/TR uses avalanche technology, which provides inherent overvoltage clamping, whereas US2MA uses standard rectifier technology. BYG23M-E3/TR is an active product with higher inventory availability. Forward voltage is specified at 1 A rather than 1.5 A.

Q: Can CMR1-10M TR13 PBFREE replace US2MA?

A: CMR1-10M is not a direct replacement. While it maintains the 1000 V voltage rating and DO-214AC package, its average rectified current is limited to 1.0 A compared to US2MA's 1.5 A. This part is suitable only for applications where circuit current does not exceed 1.0 A. Additionally, CMR1-10M uses standard recovery characteristics (>500 ns) rather than fast recovery (75 ns).

Q: Why does CMR1U-13M TR13 PBFREE have a higher voltage rating?

A: CMR1U-13M is rated for 1300 V reverse voltage, exceeding the US2MA specification of 1000 V. This elevated rating provides additional margin in high-voltage applications. However, CMR1U-13M is limited to 1.0 A average rectified current and is suitable only for applications where current demand does not exceed this level.

Q: What is the significance of packaging format (Tape & Reel vs. Cut Tape)?

A: Tape & Reel (TR) packaging is optimized for automated assembly processes with continuous component feed. Cut Tape (CT) packaging is supplied in individual tape segments and is typically used for lower-volume or manual assembly operations. Both formats use identical DO-214AC packages and are mechanically compatible with standard surface mount equipment. Selection depends on production volume and assembly process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (NRVUS2MA, HS2MA R3G, BYG23M-E3/TR, CMR1-10M TR13 PBFREE, and CMR1U-13M TR13 PBFREE) are ROHS3 compliant. All parts are also REACH unaffected and carry EAR99 export classification.

Q: Which substitute part has the longest operating temperature range?

A: CMR1U-13M TR13 PBFREE operates from -65°C to 175°C, providing the widest temperature range. US2MA and NRVUS2MA operate from -55°C to 150°C. Extended temperature range is beneficial for applications in extreme thermal environments.

Q: What does "Not For New Designs" status mean?

A: "Not For New Designs" indicates the component has reached end-of-life and is no longer recommended for new product development. Existing inventory may be available for legacy product support, but long-term supply is not guaranteed. For new designs, active products such as BYG23M-E3/TR should be selected.

Q: Is HS2MA R3G still available?

A: HS2MA R3G is discontinued at DiGi Electronics, indicating limited availability through primary distribution channels. While 9,300 units are currently in stock, this part should be considered for immediate replacement needs only. For ongoing production, select active products such as BYG23M-E3/TR or NRVUS2MA.

Q: What is reverse recovery time and why does it matter?

A: Reverse recovery time (trr) is the interval required for a diode to transition from forward conduction to reverse blocking when the applied voltage reverses. US2MA and most substitutes have 75 ns recovery time, classified as fast recovery. CMR1-10M has unspecified recovery time but is classified as standard recovery (>500 ns). Fast recovery reduces switching losses in high-frequency applications and is preferred for power conversion circuits.

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