BAS21/8R Equivalent & Substitute Parts

Part Overview

The BAS21/8R is a general-purpose rectifier diode manufactured by Nexperia USA Inc., rated for 250 V DC reverse voltage and 200 mA average rectified current in a surface mount TO-236AB package. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. Substitute parts must maintain electrical performance across voltage, current, and thermal specifications while accommodating surface mount assembly requirements.

Substiute Parts

BAS21/8R

Nexperia USA Inc.In Stock: 1110BAS21/8R Datasheet

Current PartRFQ

BAS21LT1G

onsemiIn Stock: 394139BAS21LT1G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BAS21/8R are identified based on strict electrical and mechanical parameter equivalence. The substitution criteria are:

Electrical Parameters (Must Match):

• Voltage - DC Reverse (Vr) (Max): 250 V
• Current - Average Rectified (Io): 200 mA
• Voltage - Forward (Vf) (Max) @ If: 1.25 V @ 200 mA
• Reverse Recovery Time (trr): 50 ns
• Current - Reverse Leakage @ Vr: 100 nA @ 200 V
• Capacitance @ Vr, F: 5 pF @ 0V, 1MHz

Mechanical Parameters (Must Match):

• Mounting Type: Surface Mount
• Package / Case: TO-236-3, SC-59, SOT-23-3

Compliance Parameters (Must Match or Exceed):

• Operating Temperature - Junction: 150°C (Max)
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The BAS21LT1G from onsemi meets all specified electrical and mechanical parameters and maintains full compliance with environmental and regulatory requirements.

Parameter Comparison

Engineering Selection Recommendations

The BAS21LT1G from onsemi is a direct functional equivalent to the BAS21/8R. Both components share identical electrical specifications across all critical parameters: reverse voltage rating, forward current capacity, forward voltage drop, reverse recovery time, reverse leakage current, and junction capacitance. Both are packaged in the TO-236-3 (SOT-23-3) surface mount configuration and support identical PCB assembly processes.

The primary distinction is product status: the BAS21/8R is obsolete, while the BAS21LT1G is active. The BAS21LT1G offers extended operating temperature range (-55°C to 150°C versus 150°C maximum for the BAS21/8R), providing additional thermal margin in applications with low-temperature exposure. Both components maintain ROHS3 compliance and unlimited moisture sensitivity classification (MSL 1).

For new designs or production continuity, the BAS21LT1G is the appropriate selection. Existing designs using the BAS21/8R can transition to the BAS21LT1G without circuit modification, as all electrical and mechanical parameters are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the BAS21LT1G replace the BAS21/8R in existing designs?

A: Yes. The BAS21LT1G is electrically and mechanically equivalent to the BAS21/8R across all specified parameters. No circuit modifications are required. Both components are rated for 250 V reverse voltage, 200 mA average rectified current, and operate in the TO-236-3 surface mount package.

Q: What is the difference between the BAS21/8R and BAS21LT1G?

A: The primary difference is product status and operating temperature range. The BAS21/8R is obsolete; the BAS21LT1G is active. The BAS21LT1G supports an extended operating temperature range of -55°C to 150°C, compared to the BAS21/8R maximum of 150°C. All electrical specifications are identical.

Q: Are the packages physically identical?

A: Yes. Both the BAS21/8R and BAS21LT1G use the TO-236-3 (SOT-23-3, SC-59) surface mount package. They are pin-compatible and footprint-compatible for PCB assembly.

Q: Do both parts meet RoHS compliance?

A: Yes. Both the BAS21/8R and BAS21LT1G are ROHS3 compliant and carry unlimited moisture sensitivity classification (MSL 1).

Q: What is the reverse recovery time specification?

A: Both components specify a reverse recovery time (trr) of 50 ns, indicating small-signal diode performance suitable for general-purpose rectification applications.

Q: Can these diodes be used interchangeably in high-frequency switching applications?

A: Both components are classified as small-signal diodes with identical reverse recovery time (50 ns) and capacitance specifications (5 pF @ 0V, 1MHz). Interchangeability depends on specific circuit requirements and frequency of operation, which must be evaluated against application specifications.