CD214L-T24ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T24ALF is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. Specified with a 24V reverse standoff voltage, 38.9V maximum clamping voltage, and 77.2A peak pulse current in a DO-214AB (SMC) package, this component is classified as obsolete. Due to its discontinued status, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure supply chain availability for new production and field replacements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	24	V
Voltage - Breakdown (Min)	26.7	V
Voltage - Clamping (Max) @ Ipp	38.9	V
Current - Peak Pulse (10/1000µs)	77.2	A
Power - Peak Pulse	3000	W
Package / Case	DO-214AB, SMC	—
Operating Temperature Range	-55 to 150	°C
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the CD214L-T24ALF is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 24V (nominal)
Voltage - Breakdown (Min): 26.7V
Voltage - Clamping (Max) @ Ipp: 38.9V
Current - Peak Pulse (10/1000µs): 77.2A (±tolerance acceptable)
Power - Peak Pulse: 3000W minimum
Package / Case: DO-214AB, SMC (surface mount)
Type: Unidirectional Zener diode
Mounting: Surface Mount

Substitute parts are grouped into two categories:

Direct Equivalents (3000W Class): Parts matching all electrical specifications and 3000W power rating with identical or compatible package designations.

Higher-Power Alternatives (5000W Class): Parts with identical voltage specifications but elevated peak pulse current (129A) and 5000W power rating, suitable for applications requiring enhanced transient energy absorption.

Lower-Power Variants (600W Class): Parts with identical voltage specifications but reduced peak pulse current (38.6A) and 600W power rating, applicable only where lower energy dissipation is acceptable.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	V(BR) Min (V)	VC Max @ Ipp (V)	Ipp (A)	Power (W)	Package	Status
CD214L-T24ALF	Bourns Inc.	24	26.7	38.9	77.2	3000	DO-214AB, SMC	Obsolete
SMLJ24A	Bourns Inc.	24	26.7	38.9	77.2	3000	DO-214AB, SMC	Active
3.0SMCJ24A-13	Diodes Incorporated	24	26.7	38.9	77.1	3000	DO-214AB, SMC	Active
SMDJ24A	Alpha & Omega Semiconductor Inc.	24	26.7	38.9	77.2	3000	DO-214AB, SMC	Active
SMDJ24A-HR	Littelfuse Inc.	24	26.7	38.9	77.1	3000	DO-214AB, SMC	Active
SMDJ24A-HRA	Littelfuse Inc.	24	26.7	38.9	77.1	3000	DO-214AB, SMC	Active
SMDJ24A-HRAT7	Littelfuse Inc.	24	26.7	38.9	77.1	3000	DO-214AB, SMC	Active
5.0SMDJ24A	Taiwan Semiconductor Corporation	24	26.7	38.9	129	5000	DO-214AB, SMC	Active
5.0SMDJ24A-T7	Littelfuse Inc.	24	26.7	38.9	129	5000	DO-214AB, SMC	Active
SMCJ24A	EVVO Semi	24	26.7	38.9	38.6	600	DO-214AC, SMA	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

Select from SMLJ24A (Bourns Inc.), 3.0SMCJ24A-13 (Diodes Incorporated), SMDJ24A (Alpha & Omega Semiconductor Inc.), SMDJ24A-HR, SMDJ24A-HRA, or SMDJ24A-HRAT7 (Littelfuse Inc.). All maintain the 24V standoff voltage, 38.9V clamping voltage, 77.1–77.2A peak pulse current, and 3000W power rating in DO-214AB (SMC) packaging. All listed substitutes are active products with ROHS3 compliance and MSL 1 rating, ensuring regulatory alignment and supply continuity.

For Enhanced Transient Protection:

Where circuit design permits higher energy absorption, 5.0SMDJ24A (Taiwan Semiconductor Corporation) or 5.0SMDJ24A-T7 (Littelfuse Inc.) provide 129A peak pulse current and 5000W power rating while maintaining identical voltage specifications and DO-214AB (SMC) packaging. These are suitable for applications experiencing higher-magnitude transient events.

For Space-Constrained or Lower-Energy Applications:

SMCJ24A (EVVO Semi) maintains voltage specifications but operates at 38.6A peak pulse current and 600W power rating in a DO-214AC (SMA) package. This variant is applicable only where transient energy levels are significantly lower than the original design specification.

Compliance and Availability:

All recommended substitutes carry ROHS3 compliance and are classified as active products, ensuring long-term availability and regulatory conformance. Littelfuse variants (SMDJ24A-HR, SMDJ24A-HRA, SMDJ24A-HRAT7) support extended operating temperature ranges (-65°C to 150°C), providing additional margin in thermally demanding environments.

Frequently Asked Questions (FAQ)

Q: Can SMLJ24A directly replace CD214L-T24ALF without circuit modification?

A: Yes. SMLJ24A is manufactured by Bourns Inc. and matches all electrical parameters: 24V standoff voltage, 26.7V minimum breakdown voltage, 38.9V clamping voltage, 77.2A peak pulse current, and 3000W power rating. Both use DO-214AB (SMC) packaging. No circuit changes are required.

Q: What is the difference between 3000W and 5000W TVS diodes in this voltage class?

A: The 3000W variants (CD214L-T24ALF, SMLJ24A, SMDJ24A) handle 77.1–77.2A peak pulse current. The 5000W variants (5.0SMDJ24A, 5.0SMDJ24A-T7) handle 129A peak pulse current. Both maintain identical voltage specifications (24V standoff, 38.9V clamping). Selection depends on the magnitude of transient events in the application. Higher power ratings provide greater energy dissipation capacity.

Q: Are Littelfuse SMDJ24A-HR variants interchangeable with Alpha & Omega SMDJ24A?

A: Yes, electrically. Both maintain 24V standoff, 38.9V clamping, 77.1–77.2A peak pulse current, and 3000W power rating in DO-214AB (SMC) packaging. Littelfuse variants support -65°C to 150°C operating temperature, while Alpha & Omega supports -55°C to 150°C. For applications within -55°C to 150°C, both are functionally equivalent.

Q: Why is SMCJ24A (EVVO Semi) listed as a substitute if it has lower current and power ratings?

A: SMCJ24A maintains identical voltage specifications (24V standoff, 38.9V clamping) but operates at 38.6A peak pulse current and 600W power rating. It is listed as a lower-power alternative for applications where transient energy levels are substantially lower than the original 3000W design. It is not suitable for applications requiring the full 77.2A capability.

Q: What is the significance of the "-T7" suffix in Littelfuse part numbers?

A: The "-T7" suffix indicates a specific tape and reel packaging configuration. It does not affect electrical performance. SMDJ24A-HRAT7 and 5.0SMDJ24A-T7 are electrically identical to their non-T7 counterparts but are supplied in standardized reel formats for automated assembly.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All active substitute parts listed carry ROHS3 compliance certification, ensuring regulatory alignment with current environmental and hazardous substance restrictions.

Q: Can I use a 5000W variant in a circuit designed for 3000W?

A: Yes. The 5000W variants (5.0SMDJ24A, 5.0SMDJ24A-T7) maintain identical voltage specifications and are pin-compatible in DO-214AB (SMC) packaging. They provide enhanced transient energy absorption without affecting circuit operation. No design changes are required.

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