SMBJ40HE3/5B Equivalent & Substitute Parts

Part Overview

The SMBJ40HE3/5B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the DO-214AA (SMB) package. This component operates with a 40V reverse standoff voltage and provides transient protection with a 71.4V maximum clamping voltage at 8.4A peak pulse current. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SMBJ40HE3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 900SMBJ40HE3/5B Datasheet

Current PartRFQ

SMBJ40E3/TR13

Microchip TechnologyIn Stock: 856SMBJ40E3/TR13 Datasheet

DirectRFQ

SM6T47AY

STMicroelectronicsIn Stock: 4460SM6T47AY Datasheet

MFR RecommendedRFQ

SMBJ40A

MDDIn Stock: 17458SMBJ40A Datasheet

MFR RecommendedRFQ

SMBJ40A

MDDIn Stock: 17458SMBJ40A Datasheet

MFR RecommendedRFQ

SMBJ40A

MDDIn Stock: 17458SMBJ40A Datasheet

MFR RecommendedRFQ

SMBJ40A-13-F

Diodes IncorporatedIn Stock: 189781SMBJ40A-13-F Datasheet

MFR RecommendedRFQ

SMBJ40A-TP

Micro Commercial CoIn Stock: 8503SMBJ40A-TP Datasheet

MFR RecommendedRFQ

SMBJ40A-TR

STMicroelectronicsIn Stock: 3286SMBJ40A-TR Datasheet

MFR RecommendedRFQ

TV06B400J-G

Comchip TechnologyIn Stock: 841TV06B400J-G Datasheet

MFR RecommendedRFQ

TV06B400J-HF

Comchip TechnologyIn Stock: 716TV06B400J-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ40HE3/5B is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Reverse standoff voltage: 40V (Typ)
• Breakdown voltage minimum: 44.4V
• Package type: DO-214AA / SMB (surface mount)
• Unidirectional channel configuration: 1 channel
• Power rating: 600W peak pulse
• RoHS3 compliance and MSL 1 rating

Secondary Compatibility Factors:

• Clamping voltage tolerance (64.5V to 84V acceptable within application margins)
• Peak pulse current capability (8.4A to 48A acceptable depending on circuit requirements)
• Operating temperature range (-50°C to -65°C minimum acceptable)
• Product status (active preferred for long-term availability)

Substitute parts maintain the core 40V standoff and 44.4V breakdown specifications while offering variations in clamping voltage and peak current handling. All listed substitutes share identical package geometry and mounting characteristics, ensuring direct PCB compatibility.

Parameter Comparison

Engineering Selection Recommendations

Direct Electrical Equivalents (Clamping Voltage 71.4V):

• SMBJ40E3/TR13 (Microchip Technology): Active product with identical electrical specifications. Recommended for applications requiring exact parameter matching. Operating temperature range extends to -65°C, providing enhanced cold-temperature performance.

Functional Substitutes (Clamping Voltage 64.5V - 9.3A to 9.7A):

• SMBJ40A-13-F (Diodes Incorporated): Active status with highest inventory availability (189,737 pcs). Suitable for general-purpose transient protection where 6.9V lower clamping voltage is acceptable within circuit design margins.
• SMBJ40A-TP (Micro Commercial Co): Active status with extended operating temperature to 175°C. Appropriate for high-temperature applications.
• SMBJ40A-TR (STMicroelectronics): Active status with TRANSIL™ series designation. Peak current specification of 9.7A provides marginal improvement over original 8.4A rating.
• TV06B400J-G and TV06B400J-HF (Comchip Technology): Active status with 9.3A peak current. Suitable where Comchip sourcing is preferred.

Enhanced Performance Alternative (Clamping Voltage 84V - 48A):

• SM6T47AY (STMicroelectronics): Active product with automotive grade and AEC-Q101 qualification. Higher peak current capability (48A at 8/20µs) and clamping voltage (84V) provide enhanced transient suppression margin. Recommended for applications requiring superior surge protection or where higher energy dissipation is anticipated.

All substitute parts maintain DO-214AA / SMB package compatibility, ROHS3 compliance, and MSL 1 rating. Selection should be based on specific circuit requirements for clamping voltage tolerance, peak current handling, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can SMBJ40A variants directly replace SMBJ40HE3/5B? A: Yes, with electrical margin consideration. SMBJ40A variants maintain the 40V standoff and 44.4V breakdown specifications. The clamping voltage is 64.5V versus 71.4V on the original part. This 6.9V difference is acceptable in most applications where the circuit design accommodates the lower clamping threshold. Verify your specific transient voltage limits before selection.

Q: What is the difference between SMBJ40E3/TR13 and SMBJ40A-based substitutes? A: SMBJ40E3/TR13 maintains the original 71.4V clamping voltage specification, providing exact electrical equivalence. SMBJ40A variants reduce clamping voltage to 64.5V but increase peak current capability slightly (9.3A to 9.7A versus 8.4A). Choose SMBJ40E3/TR13 for strict parameter matching; choose SMBJ40A variants for general-purpose applications with lower clamping voltage tolerance.

Q: Why is SM6T47AY listed as a substitute if its clamping voltage is 84V? A: SM6T47AY is a functional alternative for applications requiring enhanced transient protection. The higher clamping voltage (84V) and significantly higher peak current (48A at 8/20µs) provide superior surge handling capability. This part is suitable when circuit design allows higher clamping voltage or when additional protection margin is required. It maintains automotive grade and AEC-Q101 qualification matching the original part.

Q: Are all substitutes compatible with the same PCB footprint? A: Yes. All listed substitutes use the DO-214AA / SMB package with identical pin spacing and mounting geometry. Direct PCB footprint compatibility is confirmed across all alternatives. No layout modifications are required for substitution.

Q: What is the significance of product status (Active vs. Obsolete)? A: Active products have ongoing manufacturing and long-term availability assurance. The original SMBJ40HE3/5B is obsolete, meaning production has ended and inventory is limited. All listed substitutes are active products, ensuring reliable procurement for current and future production runs. Active status is critical for design continuity and supply chain stability.

Q: Does operating temperature range affect substitution suitability? A: Operating temperature range should match or exceed your application requirements. The original part specifies -55°C to 150°C. SMBJ40E3/TR13 extends to -65°C (enhanced cold-temperature performance). SMBJ40A-TP extends to 175°C (enhanced high-temperature performance). Select based on your specific thermal environment. Parts with unspecified operating temperature (TV06B400J variants) require verification with the manufacturer before use in temperature-critical applications.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental compliance profile. This ensures compatibility with modern manufacturing and environmental regulations.