CD214L-T40ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T40ALF is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., rated for 40V reverse standoff voltage with a 64.5V maximum clamping voltage. This component is designed for general-purpose transient protection in surface mount applications using the DO-214AB (SMC) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

CD214L-T40ALF

Bourns Inc.In Stock: 825CD214L-T40ALF Datasheet

Current PartRFQ

SMLJ40A

Bourns Inc.In Stock: 30169SMLJ40A Datasheet

DirectRFQ

5.0SMDJ40A

Taiwan Semiconductor CorporationIn Stock: 182575.0SMDJ40A Datasheet

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5.0SMDJ40A-T7

Littelfuse Inc.In Stock: 14425.0SMDJ40A-T7 Datasheet

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SMCJ40A

MeritekIn Stock: 16042SMCJ40A Datasheet

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SMCJ40A

MeritekIn Stock: 16042SMCJ40A Datasheet

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SMDJ40A

Alpha & Omega Semiconductor Inc.In Stock: 1206SMDJ40A Datasheet

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SMDJ40A-HR

Littelfuse Inc.In Stock: 1659SMDJ40A-HR Datasheet

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SZ1SMC40AT3G

Littelfuse Inc.In Stock: 3254SZ1SMC40AT3G Datasheet

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TPSMC47A

Littelfuse Inc.In Stock: 1812TPSMC47A Datasheet

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TPSMC51A

Littelfuse Inc.In Stock: 1304TPSMC51A Datasheet

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TPSMC56A

Littelfuse Inc.In Stock: 1114TPSMC56A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD214L-T40ALF is determined by strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 40V
• Voltage - Clamping (Max) @ Ipp: 64.5V
• Voltage - Breakdown (Min): 44.4V
• Package / Case: DO-214AB, SMC
• Unidirectional Channels: 1
• Type: Zener

Substitute parts are grouped into two categories:

Direct Equivalents maintain identical electrical specifications and are suitable for direct replacement without circuit re-evaluation:

• SMLJ40A (Bourns Inc.) — Active product status, identical specifications

Similar Substitutes share the same voltage ratings and package but differ in peak pulse current, power dissipation, or operating temperature range. These require verification of circuit current requirements:

• 5.0SMDJ40A (Taiwan Semiconductor Corporation) — Higher peak pulse current (77.6A) and power rating (5kW)
• 5.0SMDJ40A-T7 (Littelfuse Inc.) — Higher peak pulse current (77.6A) and power rating (5kW)
• SMCJ40A (Meritek) — Lower peak pulse current (23.26A) and power rating (1.5kW)
• SMDJ40A (Alpha & Omega Semiconductor Inc.) — Equivalent peak pulse current (46.6A) and power rating (3kW)
• SMDJ40A-HR (Littelfuse Inc.) — Equivalent peak pulse current (46.5A) and power rating (3kW)
• SZ1SMC40AT3G (Littelfuse Inc.) — Lower peak pulse current (32.2A) and power rating (1.5kW), automotive grade with AEC-Q101 qualification
• TPSMC47A (Littelfuse Inc.) — Slightly higher reverse standoff voltage (40.2V), lower peak pulse current (24.6A), automotive grade with AEC-Q101 qualification
• TPSMC51A (Littelfuse Inc.) — Higher reverse standoff voltage (43.6V), lower peak pulse current (21.7A), automotive grade with AEC-Q101 qualification

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: SMLJ40A is the recommended primary substitute. It is manufactured by Bourns Inc., maintains identical electrical specifications to the CD214L-T40ALF, and carries active product status with ROHS3 compliance and MSL 1 rating. This part requires no circuit re-evaluation.

For Higher Transient Energy Applications: 5.0SMDJ40A (Taiwan Semiconductor Corporation) or 5.0SMDJ40A-T7 (Littelfuse Inc.) are suitable when circuit transient energy exceeds 3kW. Both parts maintain the 40V reverse standoff and 64.5V clamping voltage while providing 5kW peak pulse power and higher peak pulse current (77.6A). Both are ROHS3 compliant and active products.

For Lower Current Applications: SMCJ40A (Meritek), SZ1SMC40AT3G (Littelfuse Inc.), or TPSMC47A (Littelfuse Inc.) are suitable when circuit peak pulse current requirements are below 32.2A. These parts maintain voltage specifications while reducing power dissipation to 1.5kW. SZ1SMC40AT3G and TPSMC47A carry automotive-grade qualification with AEC-Q101 certification.

For Equivalent Performance: SMDJ40A (Alpha & Omega Semiconductor Inc.) and SMDJ40A-HR (Littelfuse Inc.) provide equivalent electrical performance to the original part with 46.6A and 46.5A peak pulse current respectively, both rated at 3kW power dissipation. Both are ROHS3 compliant and active products.

For Automotive Applications: SZ1SMC40AT3G, TPSMC47A, and TPSMC51A carry automotive-grade qualification with AEC-Q101 certification. These parts are suitable for automotive transient protection circuits where qualification status is required.

All substitute parts are available in DO-214AB (SMC) surface mount package and maintain ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can SMLJ40A be used as a direct replacement for CD214L-T40ALF? A: Yes. SMLJ40A maintains identical voltage ratings (40V reverse standoff, 64.5V clamping), peak pulse current (46.4A), power dissipation (3kW), operating temperature range (-55°C to 150°C), and package type (DO-214AB, SMC). It is manufactured by Bourns Inc. and carries active product status.

Q: What is the difference between the 3kW and 5kW rated parts? A: The 5kW parts (5.0SMDJ40A and 5.0SMDJ40A-T7) provide higher peak pulse current (77.6A) and power dissipation capability compared to the 3kW parts. Selection depends on the actual transient energy present in the circuit. If circuit transient pulses exceed 3kW, the 5kW rated parts are required.

Q: Can lower current rated parts (1.5kW) be used as substitutes? A: Lower current rated parts (SMCJ40A, SZ1SMC40AT3G, TPSMC47A) can be used only if the circuit peak pulse current does not exceed their rated values (23.26A, 32.2A, and 24.6A respectively). Using an undersized part may result in component failure during transient events.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts are ROHS3 compliant and suitable for applications requiring RoHS compliance.

Q: What is the difference between standard and automotive-grade parts? A: Automotive-grade parts (SZ1SMC40AT3G, TPSMC47A, TPSMC51A) carry AEC-Q101 qualification, indicating they meet automotive industry reliability and testing standards. These parts are required for automotive applications where qualification status is mandatory.

Q: Do all substitute parts use the same DO-214AB package? A: Yes. All substitute parts listed use the DO-214AB (SMC) surface mount package, ensuring mechanical and electrical compatibility with the original CD214L-T40ALF footprint.

Q: What is the operating temperature range difference between parts? A: Most parts operate from -55°C to 150°C. Some parts extend the lower temperature limit to -65°C (SMDJ40A-HR, SZ1SMC40AT3G, 5.0SMDJ40A-T7). The 5.0SMDJ40A extends the upper temperature limit to 175°C. Selection depends on the specific thermal environment of the application.

Q: Are there voltage rating differences between substitute parts? A: Most substitute parts maintain the 40V reverse standoff and 64.5V clamping voltage. TPSMC47A has slightly higher ratings (40.2V standoff, 64.8V clamping), and TPSMC51A has significantly higher ratings (43.6V standoff, 70.1V clamping). These higher voltage parts are not direct substitutes and require circuit re-evaluation.