CD214B-T20ALF Equivalent & Substitute Parts

Part Overview

The CD214B-T20ALF is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., rated for 20V reverse standoff voltage with a 32.4V maximum clamping voltage. Housed in the DO-214AA (SMB) surface mount package, this component is designed for general-purpose transient voltage protection applications with a peak pulse power rating of 600W.

The CD214B-T20ALF 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	Unit
Voltage - Reverse Standoff (Typ)	20	V
Voltage - Breakdown (Min)	22.2	V
Voltage - Clamping (Max) @ Ipp	32.4	V
Current - Peak Pulse (10/1000µs)	18.5	A
Power - Peak Pulse	600	W
Type	Zener	—
Unidirectional Channels	1	—
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55°C ~ 150°C	TJ
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the CD214B-T20ALF are identified based on strict electrical and mechanical parameter matching within the TVS diode category. The following criteria determine substitution eligibility:

Primary Matching Criteria:

Voltage - Reverse Standoff (Typ): 20V
Voltage - Clamping (Max) @ Ipp: 32.4V
Current - Peak Pulse (10/1000µs): 18.5A (±tolerance acceptable)
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Type: Unidirectional Zener
Mounting Type: Surface Mount

Secondary Compliance Criteria:

RoHS3 Compliance
Moisture Sensitivity Level (MSL): 1
ECCN: EAR99
HTSUS: 8541.10.0080

Substitute parts are classified as either Direct Equivalents (matching all primary parameters) or Similar Alternatives (matching core electrical specifications with minor variations in secondary parameters such as manufacturer, packaging format, or operating temperature range).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Product Status	Operating Temp (°C)
CD214B-T20ALF	Bourns Inc.	20	32.4	18.5	600	DO-214AA, SMB	Obsolete	-55 ~ 150
SMBJ20A	Good-Ark Semiconductor	20	32.4	18.5	600	DO-214AA, SMB	Active	-55 ~ 150
SMBJ20A-M3/52	Vishay General Semiconductor - Diodes Division	20	32.4	18.5	600	DO-214AA, SMB	Active	-55 ~ 150
SMBJ20A-TP	Micro Commercial Co	20	32.4	18.5	600	DO-214AA, SMB	Active	-55 ~ 175
SMBJ20A-TR	STMicroelectronics	20	32.4	19.4	600	DO-214AA, SMB	Active	-55 ~ 150
SMBJ22A-HR	Littelfuse Inc.	22	35.5	16.9	600	DO-214AA, SMB	Active	-65 ~ 150
TV06B200J-G	Comchip Technology	20	32.4	18.52	600	DO-214AA, SMB	Active	Not specified

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

SMBJ20A (Good-Ark Semiconductor), SMBJ20A-M3/52 (Vishay), and TV06B200J-G (Comchip Technology) provide direct electrical equivalence to the CD214B-T20ALF with identical voltage ratings, clamping characteristics, and power dissipation. All three are active products with ROHS3 compliance and MSL 1 rating. SMBJ20A offers the highest inventory availability (38,610 units) and is available in multiple packaging formats (Cut Tape and Digi-Reel). Vishay's SMBJ20A-M3/52 is supplied under the TransZorb® series designation with 1,120 units in stock. Comchip's TV06B200J-G provides an alternative source with 791 units available.

Active Alternatives with Minor Parameter Variations:

SMBJ20A-TP (Micro Commercial Co) matches all primary electrical specifications and extends the operating temperature range to -55°C ~ 175°C, providing enhanced thermal performance for applications requiring higher temperature operation. Current inventory: 3,782 units.

SMBJ20A-TR (STMicroelectronics) exhibits a peak pulse current of 19.4A, which exceeds the CD214B-T20ALF specification of 18.5A by approximately 5%. This represents improved current handling capability within the same 600W power envelope and identical voltage ratings. Current inventory: 2,777 units.

Similar Alternative with Elevated Voltage Rating:

SMBJ22A-HR (Littelfuse Inc.) operates at a 22V reverse standoff voltage with 35.5V clamping voltage, representing a higher voltage class. This part is suitable only for applications where the elevated voltage rating does not conflict with circuit design requirements. The peak pulse current is 16.9A, approximately 9% lower than the CD214B-T20ALF. Extended operating temperature range: -65°C ~ 150°C. Current inventory: 874 units.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and EAR99 ECCN classification consistent with the original component.

Frequently Asked Questions (FAQ)

Q: Can SMBJ20A-TR be used as a direct replacement for CD214B-T20ALF despite the 19.4A peak pulse current specification?

A: Yes. The SMBJ20A-TR peak pulse current of 19.4A exceeds the CD214B-T20ALF specification of 18.5A. This represents improved performance within the same 600W power rating and identical voltage specifications. The higher current capability does not create compatibility issues in applications designed for the original 18.5A rating.

Q: Is SMBJ22A-HR compatible with circuits designed for CD214B-T20ALF?

A: SMBJ22A-HR operates at a higher voltage class (22V standoff, 35.5V clamping) compared to the CD214B-T20ALF (20V standoff, 32.4V clamping). Compatibility depends on circuit design requirements. If the application requires protection at exactly 20V standoff voltage, SMBJ22A-HR is not suitable. If the circuit can tolerate higher voltage thresholds, SMBJ22A-HR provides an alternative source.

Q: What is the difference between SMBJ20A supplied by Good-Ark Semiconductor and SMBJ20A-M3/52 supplied by Vishay?

A: Both parts meet identical electrical specifications (20V standoff, 32.4V clamping, 18.5A peak pulse, 600W power). The primary differences are manufacturer, packaging designation (Good-Ark uses standard SMB; Vishay uses SMBJ designation), and series branding (Vishay markets under TransZorb®). Selection between these parts depends on supply chain preference, inventory availability, and procurement lead times.

Q: Does the extended operating temperature range of SMBJ20A-TP (-55°C ~ 175°C) affect electrical performance compared to CD214B-T20ALF (-55°C ~ 150°C)?

A: The extended temperature range indicates enhanced thermal design and material selection by Micro Commercial Co. Electrical parameters (voltage, current, power) remain identical across the specified operating range. The extended upper temperature limit provides additional design margin for applications operating in elevated ambient conditions.

Q: Are all substitute parts available in the same packaging format as CD214B-T20ALF?

A: All substitute parts use the DO-214AA (SMB) surface mount package, matching the CD214B-T20ALF mechanical footprint. Packaging formats (Cut Tape, Digi-Reel, Tape & Reel) vary by manufacturer and supplier but do not affect component compatibility on the PCB.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed maintain ROHS3 compliance, Moisture Sensitivity Level 1 (unlimited shelf life), ECCN EAR99 classification, and HTSUS code 8541.10.0080, consistent with the original CD214B-T20ALF specifications.

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