BAS521LP-7 Equivalent & Substitute Parts

Part Overview

The BAS521LP-7 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 325 V DC reverse voltage and 400 mA average rectified current. The device is packaged in a 0402 (1006 Metric) surface mount form factor with fast recovery characteristics (50 ns reverse recovery time). The BAS521LP-7 is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must satisfy electrical performance requirements within the constraints of the application circuit.

Substiute Parts

BAS521LP-7

Diodes IncorporatedIn Stock: 5262BAS521LP-7 Datasheet

Current PartRFQ

CMOD2004 TR PBFREE

Central Semiconductor CorpIn Stock: 31360CMOD2004 TR PBFREE Datasheet

MFR RecommendedRFQ

CMOD2004 TR13 PBFREE

Central Semiconductor CorpIn Stock: 692CMOD2004 TR13 PBFREE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BAS521LP-7 are identified based on electrical and mechanical compatibility within the constraints of the application. The primary substitution criteria are:

Electrical Parameters:

• Voltage - DC Reverse (Vr) rating must equal or exceed the original specification
• Current - Average Rectified (Io) rating must equal or exceed the original specification
• Reverse Recovery Time (trr) and forward voltage characteristics must be compatible with circuit timing and power dissipation requirements
• Operating temperature range must encompass the application environment

Mechanical Parameters:

• Surface mount packaging is required
• Physical footprint compatibility with the PCB layout

The identified substitute parts (CMOD2004 TR PBFREE and CMOD2004 TR13 PBFREE) operate at reduced voltage and current ratings compared to the BAS521LP-7. These substitutes are suitable only for applications where the circuit design accommodates lower electrical specifications. Both substitute parts maintain the same reverse recovery time (50 ns) and operating temperature range (-65°C to 150°C), ensuring functional compatibility in circuits designed for their respective ratings.

Parameter Comparison

Engineering Selection Recommendations

BAS521LP-7 (Obsolete): This component is no longer in active production. Existing inventory of 5,245 pieces is available; however, long-term sourcing is not guaranteed. New designs should transition to active alternatives.

CMOD2004 TR PBFREE (Active): This substitute is actively manufactured by Central Semiconductor Corp with 31,260 pieces in current inventory. The part is ROHS3 compliant and REACH unaffected. The reduced voltage (240 V) and current (200 mA) ratings require circuit-level evaluation to confirm compatibility. The SOD-523 package differs from the original 0402 form factor and requires PCB layout modification.

CMOD2004 TR13 PBFREE (Active): This variant is also actively manufactured with 663 pieces in inventory. Electrical specifications are identical to CMOD2004 TR PBFREE. Both CMOD2004 variants share the same base product number and are functionally equivalent. Selection between TR and TR13 variants is determined by packaging and supply chain requirements.

Both substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity rating, and identical operating temperature ranges. The primary design consideration is the reduction in voltage and current ratings relative to the original BAS521LP-7 specification.

Frequently Asked Questions (FAQ)

Q: Can CMOD2004 TR PBFREE directly replace BAS521LP-7 in existing designs?

A: Direct replacement requires circuit-level analysis. The CMOD2004 series operates at 240 V maximum reverse voltage and 200 mA maximum current, compared to the BAS521LP-7 ratings of 325 V and 400 mA. If the application circuit operates within these reduced specifications, substitution is feasible. If the circuit requires the full 325 V or 400 mA capability, substitution is not suitable.

Q: What is the difference between CMOD2004 TR PBFREE and CMOD2004 TR13 PBFREE?

A: Both parts are functionally identical with respect to electrical specifications. The designation difference (TR versus TR13) reflects packaging and tape configuration variants. Selection is based on supply chain availability and manufacturing process requirements. Both are active products with ROHS3 compliance.

Q: Does the package change from 0402 to SOD-523 affect PCB compatibility?

A: Yes. The BAS521LP-7 uses a 0402 (1006 Metric) package, while the CMOD2004 series uses SOD-523 (SC-79) packaging. These are physically different form factors. PCB layout modification is required, including pad redesign and trace routing adjustments. Mechanical fit and thermal management characteristics may differ.

Q: Are the reverse recovery times equivalent?

A: Yes. Both the BAS521LP-7 and CMOD2004 series maintain a 50 ns reverse recovery time, ensuring equivalent switching performance in fast recovery applications.

Q: What compliance certifications apply to the substitute parts?

A: Both CMOD2004 variants are ROHS3 compliant, REACH unaffected, and carry an EAR99 ECCN classification. Moisture sensitivity level is 1 (Unlimited) for both parts, matching the original BAS521LP-7 specification.

Q: Is inventory availability a consideration for part selection?

A: CMOD2004 TR PBFREE has 31,260 pieces in stock, providing substantial availability. CMOD2004 TR13 PBFREE has 663 pieces in stock. For high-volume production, CMOD2004 TR PBFREE offers superior supply continuity.