BD675AS NPN Darlington Transistor Equivalent & Substitute Parts

Part Overview

The BD675AS is an NPN Darlington bipolar junction transistor manufactured by onsemi, rated for 45 V collector-emitter breakdown voltage and 4 A maximum collector current in a Through Hole TO-126-3 package. This device is classified as obsolete, making identification of functionally equivalent substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

BD675AS

onsemiIn Stock: 931BD675AS Datasheet

Current PartRFQ

BD675AG

onsemiIn Stock: 935BD675AG Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BD675AS is determined by electrical and mechanical parameter equivalence across the following criteria:

Electrical Parameters (Critical for Functional Compatibility):

• Transistor type: NPN - Darlington configuration
• Maximum collector current: 4 A
• Maximum collector-emitter breakdown voltage: 45 V
• Saturation voltage characteristics: 2.8V @ 40mA, 2A
• Collector cutoff current: 500µA
• DC current gain (hFE): 750 @ 2A, 3V minimum
• Maximum power dissipation: 40 W

Mechanical Parameters (Required for Physical Compatibility):

• Mounting type: Through Hole
• Package designation: TO-126-3 or equivalent TO-225AA

Compliance & Environmental Parameters:

• RoHS3 compliance status
• Moisture sensitivity level: 1 (Unlimited)

The BD675AG meets all specified electrical and mechanical parameters and is therefore a direct functional equivalent to the BD675AS.

Parameter Comparison

Engineering Selection Recommendations

The BD675AG is a direct substitute for the BD675AS. Both devices are manufactured by onsemi and share identical electrical ratings and mechanical specifications. The BD675AG provides an extended operating temperature range (-55°C to 150°C) compared to the BD675AS (150°C maximum), offering broader thermal operating capability without compromising any specified parameter.

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity classification (MSL 1), ensuring compatibility with standard manufacturing and storage protocols. The BD675AG is currently available in inventory (902 Pcs), providing procurement continuity for applications requiring the BD675AS.

Frequently Asked Questions (FAQ)

Q: Can the BD675AG replace the BD675AS in existing designs?

A: Yes. The BD675AG meets all electrical and mechanical specifications of the BD675AS. Both devices are NPN Darlington transistors with identical current, voltage, gain, and power ratings. The TO-126-3 package pinout and footprint are compatible.

Q: What is the difference between BD675AS and BD675AG?

A: The primary difference is operating temperature range. The BD675AS is rated to 150°C maximum junction temperature, while the BD675AG operates from -55°C to 150°C. All other electrical parameters are identical. The BD675AG provides extended low-temperature capability.

Q: Are there package compatibility concerns?

A: No. Both the BD675AS and BD675AG use the TO-126-3 package designation with TO-225AA case specification. Through Hole mounting is identical, and PCB footprints are compatible.

Q: Does the BD675AG meet the same compliance standards?

A: Yes. The BD675AG is ROHS3 compliant and carries MSL 1 (Unlimited) moisture sensitivity classification, matching the BD675AS compliance profile.

Q: Why is the BD675AS listed as obsolete?

A: The BD675AS is classified as obsolete by onsemi. The BD675AG serves as the current production equivalent, offering the same electrical performance with extended temperature range capability.