1.5SMB47A Equivalent & Substitute Parts

Part Overview

The 1.5SMB47A is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This surface mount component operates across a temperature range of -65°C to 150°C and is RoHS3 compliant with unlimited moisture sensitivity rating. The part is currently active in production with 794 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this product category.

Substiute Parts

1.5SMB47A

Littelfuse Inc.In Stock: 8931.5SMB47A Datasheet

Current PartRFQ

15BJ40A

Eaton - Electronics DivisionIn Stock: 686115BJ40A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1.5SMB47A is determined by equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 40V to 40.2V range
• Voltage - Clamping (Max) @ Ipp: 64.5V to 64.8V range
• Current - Peak Pulse (10/1000µs): 23.3A to 24.6A range
• Power - Peak Pulse: 1500W (1.5kW)
• Unidirectional Channels: 1
• Type: Zener
• Mounting Type: Surface Mount
• Applications: Telecom

The 15BJ40A from Eaton - Electronics Division meets these substitution criteria. Both parts maintain equivalent clamping voltage, peak pulse current, and power dissipation ratings within acceptable engineering tolerances. Package variations (DO-214AA versus SMBF) are both surface mount SMB form factors suitable for the same circuit board layouts.

Parameter Comparison

Engineering Selection Recommendations

The 15BJ40A qualifies as a direct substitute for the 1.5SMB47A based on electrical parameter equivalence and compliance certifications. Both parts are RoHS compliant, carry unlimited moisture sensitivity ratings, and maintain identical power dissipation and peak pulse current specifications. The primary consideration is the operating temperature range: the 1.5SMB47A supports -65°C to 150°C, while the 15BJ40A supports -55°C to 150°C. Selection between these parts depends on whether the application requires operation below -55°C. For applications within the -55°C to 150°C range, the 15BJ40A provides equivalent performance. Both parts are active products with established supply availability.

Frequently Asked Questions (FAQ)

Q: Can the 15BJ40A replace the 1.5SMB47A in all applications?

A: The 15BJ40A is electrically equivalent for applications operating within -55°C to 150°C. If your application requires operation below -55°C, the 1.5SMB47A is required due to its extended low-temperature rating of -65°C.

Q: Are the package differences between DO-214AA and SMBF significant?

A: Both packages are surface mount SMB form factors. The DO-214AA and SMBF packages have different lead configurations (standard versus flat leads), but both are compatible with standard SMB footprints on printed circuit boards. Verify your PCB layout accommodates the specific lead style of your selected part.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is based on matching voltage ratings (reverse standoff, breakdown, and clamping), peak pulse current, power dissipation, unidirectional channel configuration, and mounting type. The 15BJ40A maintains all critical electrical parameters within acceptable tolerances of the 1.5SMB47A.

Q: Are both parts compliant with environmental regulations?

A: Yes. The 1.5SMB47A is RoHS3 compliant, and the 15BJ40A is RoHS compliant. Both parts are REACH unaffected and carry ECCN EAR99 classification.

Q: What is the inventory status for these parts?

A: The 1.5SMB47A has 794 units in stock. The 15BJ40A has 6804 units in stock, providing greater availability if supply is a consideration.