CD214L-T22ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T22ALF is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection applications. Housed in a DO-214AB (SMC) surface mount package, this component provides 22V reverse standoff voltage with a 35.5V maximum clamping voltage and 84.4A peak pulse current capability at 3000W peak pulse power dissipation.

The CD214L-T22ALF is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	22V
Voltage - Breakdown (Min)	24.4V
Voltage - Clamping (Max) @ Ipp	35.5V
Current - Peak Pulse (10/1000µs)	84.4A
Power - Peak Pulse	3000W
Type	Zener
Unidirectional Channels	1
Package / Case	DO-214AB, SMC
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the CD214L-T22ALF is determined by strict alignment across the following critical parameters:

Mandatory Matching Parameters:

Voltage - Reverse Standoff (Typ): 22V
Voltage - Breakdown (Min): 24.4V
Voltage - Clamping (Max) @ Ipp: 35.5V
Package / Case: DO-214AB, SMC
Type: Zener
Unidirectional Channels: 1
Mounting Type: Surface Mount

Allowable Variation Parameters:

Current - Peak Pulse (10/1000µs): 84.4A ± tolerance (range: 42.3A to 141A acceptable based on application headroom)
Power - Peak Pulse: 3000W minimum (higher ratings acceptable)
Operating Temperature: -55°C minimum to 150°C maximum (extended ranges acceptable)

Substitute parts are grouped into two categories: direct equivalents (identical electrical and mechanical specifications) and compatible alternatives (matching voltage and package specifications with equal or superior current/power ratings).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Package	Product Status
CD214L-T22ALF	Bourns Inc.	22V	24.4V	35.5V	84.4A	3000W	DO-214AB, SMC	Obsolete
SMLJ22A	Bourns Inc.	22V	24.4V	35.5V	84.4A	3000W	DO-214AB, SMC	Active
3.0SMCJ22A-13	Diodes Incorporated	22V	24.4V	35.5V	84.5A	3000W	DO-214AB, SMC	Discontinued at DiGi Electronics
5.0SMDJ22A	Taiwan Semiconductor Corporation	22V	24.4V	35.5V	141A	5000W	DO-214AB, SMC	Active
5.0SMDJ22A-T7	Littelfuse Inc.	22V	24.4V	35.5V	141A	5000W	DO-214AB, SMC	Active
SMCJ22A	Fairchild Semiconductor	22V	24.4V	35.5V	42.3A	1500W	DO-214AB, SMC	Active
SMDJ22A	Alpha & Omega Semiconductor Inc.	22V	24.4V	35.5V	84.6A	3000W	DO-214AB, SMC	Active
SMDJ22A-HR	Littelfuse Inc.	22V	24.4V	35.5V	84.5A	3000W	DO-214AB, SMC	Active
SMDJ22A-HRA	Littelfuse Inc.	22V	24.4V	35.5V	84.5A	3000W	DO-214AB, SMC	Active
SMDJ22A-HRAT7	Littelfuse Inc.	22V	24.4V	35.5V	84.5A	3000W	DO-214AB, SMC	Active

Engineering Selection Recommendations

Direct Equivalent (Preferred): SMLJ22A (Bourns Inc.) is the primary recommended substitute. This part maintains identical electrical specifications (22V standoff, 24.4V breakdown, 35.5V clamping, 84.4A peak pulse, 3000W power) and identical package configuration. As an active product from the original manufacturer, SMLJ22A provides design continuity with established supply chain availability and full ROHS3 compliance.

Compatible Alternatives (Equal Performance): SMDJ22A (Alpha & Omega Semiconductor Inc.) and SMDJ22A-HR/HRA/HRAT7 (Littelfuse Inc.) provide equivalent electrical performance with 84.5A to 84.6A peak pulse current and 3000W power dissipation. All three manufacturers' parts are active products with ROHS3 compliance and DO-214AB packaging. These alternatives are suitable for direct substitution in applications where the original CD214L-T22ALF was specified.

Higher Performance Alternatives (Upgraded Capability): 5.0SMDJ22A (Taiwan Semiconductor Corporation) and 5.0SMDJ22A-T7 (Littelfuse Inc.) offer enhanced performance with 141A peak pulse current and 5000W power dissipation while maintaining identical voltage specifications and packaging. These parts are suitable for applications requiring additional thermal or current margin beyond the original design specification.

Lower Performance Alternative (Constrained Applications): SMCJ22A (Fairchild Semiconductor) provides 42.3A peak pulse current and 1500W power dissipation. This part is suitable only for applications with reduced current or power requirements compared to the original specification.

Avoid: 3.0SMCJ22A-13 (Diodes Incorporated) is discontinued at DiGi Electronics and should not be selected for new designs or ongoing production.

Frequently Asked Questions (FAQ)

Q: Can SMLJ22A directly replace CD214L-T22ALF without circuit modification? A: Yes. SMLJ22A is electrically and mechanically identical to CD214L-T22ALF across all critical parameters: 22V reverse standoff voltage, 24.4V breakdown voltage, 35.5V clamping voltage, 84.4A peak pulse current, and 3000W power dissipation. Both use DO-214AB (SMC) surface mount packaging. No circuit changes are required.

Q: What is the difference between SMDJ22A and SMDJ22A-HR? A: Both parts share identical electrical specifications (22V standoff, 84.5A peak pulse, 3000W power) and DO-214AB packaging. The "-HR" designation indicates a Littelfuse product line variant. Selection between these parts depends on supplier availability and procurement preferences. Both are suitable substitutes for CD214L-T22ALF.

Q: Can I use 5.0SMDJ22A instead of CD214L-T22ALF? A: Yes, with design consideration. 5.0SMDJ22A maintains identical voltage specifications (22V standoff, 24.4V breakdown, 35.5V clamping) and packaging (DO-214AB). However, it provides higher peak pulse current (141A vs. 84.4A) and power dissipation (5000W vs. 3000W). This represents an upgraded component suitable for applications requiring additional performance margin. No circuit modification is necessary, but thermal design should account for the higher power capability.

Q: Why is SMCJ22A listed as a substitute if it has lower current rating? A: SMCJ22A (42.3A, 1500W) meets the mandatory voltage and package matching criteria for substitution eligibility. However, it provides reduced current and power capacity compared to CD214L-T22ALF (84.4A, 3000W). SMCJ22A is suitable only for applications with lower transient current requirements. Verify application current demands before selecting this alternative.

Q: Are all substitute parts ROHS3 compliant? A: All active substitute parts listed (SMLJ22A, 5.0SMDJ22A, 5.0SMDJ22A-T7, SMCJ22A, SMDJ22A, SMDJ22A-HR, SMDJ22A-HRA, SMDJ22A-HRAT7) are ROHS3 compliant. The discontinued part 3.0SMCJ22A-13 is also ROHS3 compliant but should not be selected for new designs.

Q: What packaging options are available for substitutes? A: All substitute parts use DO-214AB (SMC) surface mount packaging, identical to CD214L-T22ALF. Packaging variations such as Tape & Reel (TR) or Bulk represent different supply formats for the same physical component and do not affect electrical or mechanical compatibility.

Q: Which substitute offers the best supply availability? A: SMDJ22A (Alpha & Omega Semiconductor Inc.) shows the highest inventory level at 28,100 pieces. SMLJ22A (Bourns Inc.) provides 24,516 pieces. Both parts offer strong supply availability for production requirements.

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