CD214C-T18ALF Equivalent & Substitute Parts

Part Overview

The CD214C-T18ALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface mount applications. This unidirectional Zener diode features an 18V reverse standoff voltage with a 29.2V maximum clamping voltage and 51.4A peak pulse current capability. The component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214C-T18ALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	18V
Voltage - Breakdown (Min)	20V
Voltage - Clamping (Max) @ Ipp	29.2V
Current - Peak Pulse (10/1000µs)	51.4A
Power - Peak Pulse	1500W
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the CD214C-T18ALF are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalents (Identical Electrical Performance): These parts maintain the exact same electrical specifications: 18V reverse standoff voltage, 20V minimum breakdown voltage, 29.2V maximum clamping voltage, 51.4A peak pulse current, and 1500W peak pulse power. All direct equivalents use the DO-214AB (SMC) surface mount package. The primary distinction is manufacturer and product status (active vs. obsolete). Direct equivalent parts include SMCJ18A (MDD), SMCJ18A-TP (Micro Commercial Co), and SMCJ18A-HR (Littelfuse Inc.).

Similar Alternatives (Enhanced Electrical Performance): These parts share the same voltage ratings (18V standoff, 20V breakdown, 29.2V clamping) and package format (DO-214AB/SMC) but provide higher peak pulse current and power dissipation capabilities. Similar alternatives include 5.0SMDJ18A (172A, 5000W), 5.0SMDJ18A-T7 (172A, 5000W), SMDJ18A (102.8A, 3000W), and SMDJ18A-T7 (102.7A, 3000W). These higher-rated devices are suitable for applications requiring greater transient energy absorption.

Key Parameters Determining Substitution:

Voltage - Reverse Standoff: 18V (fixed)
Voltage - Clamping (Max) @ Ipp: 29.2V (fixed)
Package / Case: DO-214AB, SMC (fixed)
Mounting Type: Surface Mount (fixed)
Current - Peak Pulse: 51.4A minimum (direct equivalents); 102.7A or higher (similar alternatives)
Power - Peak Pulse: 1500W minimum (direct equivalents); 3000W or higher (similar alternatives)

Parameter Comparison

Part Number	Manufacturer	Voltage Standoff (V)	Voltage Clamping (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Operating Temp (°C)	Product Status	Package
CD214C-T18ALF	Bourns Inc.	18	29.2	51.4	1500	-55 ~ 150	Obsolete	DO-214AB, SMC
SMCJ18A	MDD	18	29.2	51.4	1500	-50 ~ 150	Active	DO-214AB, SMC
SMCJ18A-TP	Micro Commercial Co	18	29.2	51.4	1500	-55 ~ 175	Active	DO-214AB, SMC
SMCJ18A-HR	Littelfuse Inc.	18	29.2	51.4	1500	-65 ~ 150	Active	DO-214AB, SMC
5.0SMDJ18A	Taiwan Semiconductor Corporation	18	29.2	172	5000	-55 ~ 175	Active	DO-214AB, SMC
5.0SMDJ18A-T7	Littelfuse Inc.	18	29.2	172	5000	-65 ~ 150	Active	DO-214AB, SMC
SMDJ18A	Alpha & Omega Semiconductor Inc.	18	29.2	102.8	3000	-55 ~ 150	Active	DO-214AB, SMC
SMDJ18A-T7	Littelfuse Inc.	18	29.2	102.7	3000	-65 ~ 150	Active	DO-214AB, SMC

Engineering Selection Recommendations

For Direct Replacement (1:1 Substitution): Select SMCJ18A (MDD), SMCJ18A-TP (Micro Commercial Co), or SMCJ18A-HR (Littelfuse Inc.) when the application requires identical electrical performance to the CD214C-T18ALF. All three direct equivalents are active products with ROHS3 compliance and MSL 1 rating. SMCJ18A-TP offers the widest operating temperature range (-55°C to 175°C), while SMCJ18A-HR provides the lowest temperature rating (-65°C). MDD's SMCJ18A offers the highest inventory availability (17,484 units).

For Enhanced Protection (Higher Power Rating): Select SMDJ18A (Alpha & Omega Semiconductor Inc.) or SMDJ18A-T7 (Littelfuse Inc.) when the application can accommodate 3000W peak pulse power dissipation. These parts maintain identical voltage specifications and package format while providing 102.7-102.8A peak pulse current. SMDJ18A-T7 extends the lower operating temperature to -65°C.

For Maximum Transient Energy Absorption: Select 5.0SMDJ18A (Taiwan Semiconductor Corporation) or 5.0SMDJ18A-T7 (Littelfuse Inc.) when the application requires 5000W peak pulse power dissipation capability. These parts deliver 172A peak pulse current while maintaining the same voltage ratings and package format. Both are active products with ROHS3 compliance.

Compliance Considerations: All substitute parts listed are ROHS3 compliant and carry REACH Unaffected or REACH Affected status. All parts are classified under HTSUS 8541.10.0080 and ECCN EAR99. MSL 1 rating applies to all active substitutes, indicating unlimited shelf life under controlled storage.

Frequently Asked Questions (FAQ)

Q: Can SMCJ18A directly replace CD214C-T18ALF without circuit modification? A: Yes. SMCJ18A maintains identical electrical specifications (18V standoff, 29.2V clamping, 51.4A peak pulse current, 1500W power) and uses the same DO-214AB (SMC) package. No circuit changes are required for direct substitution.

Q: What is the difference between direct equivalents and similar alternatives? A: Direct equivalents (SMCJ18A series) provide identical electrical performance at 1500W peak pulse power. Similar alternatives (SMDJ18A and 5.0SMDJ18A series) provide higher peak pulse current and power dissipation (3000W or 5000W) while maintaining the same voltage ratings and package format. Selection depends on whether the application requires enhanced transient protection.

Q: Are all substitute parts available in the same package format? A: Yes. All substitute parts use the DO-214AB (SMC) surface mount package, ensuring mechanical and thermal compatibility with the original CD214C-T18ALF footprint.

Q: Which substitute offers the best temperature range coverage? A: SMCJ18A-TP (Micro Commercial Co) provides the widest operating temperature range at -55°C to 175°C. For applications requiring extended low-temperature operation, SMCJ18A-HR and SMDJ18A-T7 (both Littelfuse Inc.) extend to -65°C.

Q: What is the inventory status of substitute parts? A: SMCJ18A (MDD) offers the highest availability at 17,484 units. SMDJ18A (Alpha & Omega) provides 3,967 units. 5.0SMDJ18A (Taiwan Semiconductor) has 18,400 units. All substitute parts are classified as active products.

Q: Can I use a higher-rated part (SMDJ18A or 5.0SMDJ18A) in place of CD214C-T18ALF? A: Yes. Higher-rated alternatives maintain identical voltage specifications and package format. They provide enhanced transient energy absorption capability, making them suitable for applications where additional protection margin is beneficial. No circuit modification is required.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts listed are ROHS3 compliant, meeting environmental and hazardous substance restrictions.

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