US1B Equivalent & Substitute Parts

Part Overview

The US1B is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as a fast recovery diode with a reverse recovery time of 50 ns, suitable for standard rectification applications requiring moderate switching speeds. The part maintains Active product status with 95,300 units in current inventory.

Substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when sourcing from multiple qualified manufacturers is required for supply chain resilience. The substitute parts listed maintain electrical equivalence across the critical performance parameters while offering variations in packaging, manufacturer, and availability status.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	100	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ If	1	V @ 1 A
Reverse Recovery Time (trr)	50	ns
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the US1B rectifier diode is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) Maximum: 100 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C
Technology: Standard (Fast Recovery)

Secondary Compatibility Parameters:

Voltage - Forward (Vf) Maximum @ If: 1 V @ 1 A
Reverse Recovery Time (trr): 50 ns
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Acceptable Variation Parameters:

Current - Reverse Leakage @ Vr: Specified range 1 µA to 10 µA @ 100 V (all substitutes within this range)
Capacitance @ Vr, F: Specified range 15 pF to 17 pF @ 4V, 1MHz (all substitutes within this range)
Packaging Format: Cut Tape (CT) or Tape & Reel (TR) acceptable for surface mount assembly
Manufacturer: Taiwan Semiconductor Corporation, Vishay General Semiconductor - Diodes Division, or Panjit International Inc.

All listed substitute parts meet these criteria and are electrically and mechanically interchangeable with the US1B in applications requiring 100 V, 1 A general-purpose rectification.

Parameter Comparison

Parameter	US1B	HS1B R3G	US1B R3G	US1B-E3/5AT	US1B-E3/61T	US1B_R1_00001
Manufacturer	Taiwan Semiconductor	Taiwan Semiconductor	Taiwan Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Panjit International Inc.
Voltage - DC Reverse (Vr) Max	100 V	100 V	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) Max @ If	1 V @ 1 A	1 V @ 1 A	1 V @ 1 A	1 V @ 1 A	1 V @ 1 A	1 V @ 1 A
Reverse Recovery Time (trr)	50 ns	50 ns	50 ns	50 ns	50 ns	50 ns
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V	10 µA @ 100 V	10 µA @ 100 V	1 µA @ 100 V
Capacitance @ Vr, F	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	17 pF @ 4V, 1MHz
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	-55 to 150°C	-55 to 150°C
Packaging Format	—	—	Cut Tape (CT)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
Product Status	Active	Discontinued at DiGi Electronics	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Selection (Active Status):

The US1B from Taiwan Semiconductor Corporation remains the preferred selection due to Active product status and highest current inventory (95,300 units). This part is suitable for new designs and ongoing production requirements.

Secondary Selections (Active Status):

The US1B-E3/5AT and US1B-E3/61T from Vishay General Semiconductor - Diodes Division are both Active products with substantial inventory (6,769 and 62,425 units respectively). These parts are suitable for applications where Vishay qualification is required or where Tape & Reel packaging is mandated by assembly processes. The US1B-E3/61T offers the highest inventory availability among Vishay options.

The US1B_R1_00001 from Panjit International Inc. is an Active product with 6,139 units in inventory. This part is suitable for applications requiring multi-source qualification or where Panjit manufacturing is specified.

Discontinued Parts (Limited Use):

The HS1B R3G and US1B R3G from Taiwan Semiconductor Corporation are both Discontinued at DiGi Electronics. These parts retain limited inventory (3,538 and 1,206 units respectively) and are suitable only for legacy system support or where existing stock is available. These parts are not recommended for new designs.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with current environmental and regulatory requirements.

Reverse Leakage Variation:

The US1B_R1_00001 exhibits superior reverse leakage performance (1 µA @ 100 V) compared to the primary part (5 µA @ 100 V) and Vishay options (10 µA @ 100 V). This lower leakage may be advantageous in low-power or high-impedance circuit applications.

Capacitance Variation:

The US1B_R1_00001 exhibits slightly elevated junction capacitance (17 pF @ 4V, 1MHz) compared to all other options (15 pF @ 4V, 1MHz). This minor difference is within acceptable tolerance for most rectification applications but may require consideration in high-frequency switching circuits.

Frequently Asked Questions (FAQ)

Q: Can I substitute the US1B with any of the listed parts without circuit modification?

A: Yes. All listed substitute parts maintain identical voltage ratings (100 V), current ratings (1 A), forward voltage characteristics (1 V @ 1 A), and reverse recovery time (50 ns). The DO-214AC (SMA) package is identical across all parts. Direct substitution is electrically valid without circuit redesign.

Q: What is the difference between the Taiwan Semiconductor and Vishay versions?

A: The primary electrical difference is reverse leakage current. Taiwan Semiconductor parts (US1B, HS1B R3G, US1B R3G) specify 5 µA @ 100 V, while Vishay parts (US1B-E3/5AT, US1B-E3/61T) specify 10 µA @ 100 V. Both values are within acceptable rectifier specifications. Packaging format differs: Vishay parts are supplied in Tape & Reel format, while Taiwan Semiconductor options vary.

Q: Why are HS1B R3G and US1B R3G marked as Discontinued?

A: These parts are Discontinued at DiGi Electronics, indicating they are no longer actively stocked by this distributor. However, limited inventory remains available (3,538 and 1,206 units respectively). These parts are suitable only for legacy applications where existing stock is available. For new designs, select from Active status parts: US1B, US1B-E3/5AT, US1B-E3/61T, or US1B_R1_00001.

Q: What packaging formats are available?

A: The US1B is supplied in unspecified packaging format. The US1B R3G is supplied in Cut Tape (CT) format. The US1B-E3/5AT, US1B-E3/61T, and US1B_R1_00001 are all supplied in Tape & Reel (TR) format. Tape & Reel format is standard for automated assembly processes. Cut Tape format is suitable for manual or semi-automated assembly. Select packaging based on assembly equipment requirements.

Q: Are all parts RoHS compliant?

A: Yes. All substitute parts maintain ROHS3 compliance and REACH Unaffected status, meeting current environmental regulations for electronic components.

Q: Which part has the best reverse leakage performance?

A: The US1B_R1_00001 from Panjit International Inc. exhibits the lowest reverse leakage current at 1 µA @ 100 V, compared to 5 µA @ 100 V for Taiwan Semiconductor parts and 10 µA @ 100 V for Vishay parts. Lower reverse leakage may be beneficial in low-power or high-impedance applications.

Q: Can I use these parts interchangeably in existing designs?

A: Yes. All parts are electrically equivalent across the critical parameters that determine rectifier performance: reverse voltage, forward current, forward voltage drop, and reverse recovery time. Mechanical compatibility is identical due to common DO-214AC (SMA) packaging. Substitution is valid for both new designs and existing circuit modifications.

Q: What is the moisture sensitivity level for these parts?

A: All parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. These parts do not require special moisture control during storage, handling, or assembly.

Q: Which part should I select for a new design?

A: For new designs, select from Active status parts. The US1B from Taiwan Semiconductor Corporation is the primary recommendation due to highest inventory availability (95,300 units). The US1B-E3/61T from Vishay offers the highest inventory among Vishay options (62,425 units) if Vishay qualification is required. The US1B_R1_00001 from Panjit is suitable if multi-source qualification or superior reverse leakage performance is required.

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