CD214B-T150ALF Equivalent & Substitute Parts

Part Overview

The CD214B-T150ALF is a unidirectional transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface mount applications. Specified with a 150V reverse standoff voltage and 243V maximum clamping voltage at 2.5A peak pulse current, this component operates across -55°C to 150°C and is packaged in the DO-214AA (SMB) form factor. The part is currently obsolete, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	150	V
Voltage - Breakdown (Min)	167	V
Voltage - Clamping (Max) @ Ipp	243	V
Current - Peak Pulse (10/1000µs)	2.5	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CD214B-T150ALF is determined by strict electrical and mechanical compatibility across the following parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 150V
Voltage - Clamping (Max) @ Ipp: 243V
Current - Peak Pulse (10/1000µs): 2.5A
Package / Case: DO-214AA (SMB)
Unidirectional Channels: 1

Direct Equivalents maintain all primary electrical specifications and package requirements. These parts are functionally interchangeable without circuit modification.

Similar Alternatives deviate from one or more primary electrical parameters while maintaining the same package form factor and general application category. These parts require engineering evaluation to confirm suitability for the specific circuit protection requirement.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ) [V]	VBR (Min) [V]	VC (Max) @ Ipp [V]	Ipp [A]	Temp Range [°C]	Package	Status
CD214B-T150ALF	Bourns Inc.	150	167	243	2.5	-55 to 150	DO-214AA	Obsolete
SMBJ150A	MDD	150	167	243	2.5	-50 to 150	DO-214AA	Active
P6SMB150A-M3/52	Vishay General Semiconductor	128	143	207	2.9	-65 to 150	DO-214AA	Active
P6SMB150A-M3/5B	Vishay General Semiconductor	128	143	207	2.9	-65 to 150	DO-214AA	Active
P6SMB160A-M3/52	Vishay General Semiconductor	136	152	219	2.7	-65 to 150	DO-214AA	Active
P6SMB160A-M3/5B	Vishay General Semiconductor	136	152	219	2.7	-65 to 150	DO-214AA	Active
P6SMB170A-M3/52	Vishay General Semiconductor	145	162	234	2.6	-65 to 150	DO-214AA	Active
P6SMB170A-M3/5B	Vishay General Semiconductor	145	162	234	2.6	-65 to 150	DO-214AA	Active
SM6T150A-M3/52	Vishay General Semiconductor	128	143	207	2.9	-65 to 150	DO-214AA	Active

Engineering Selection Recommendations

Direct Replacement (Recommended for Obsolescence Mitigation):

SMBJ150A from MDD is the primary direct equivalent. This part maintains identical electrical specifications (150V VWM, 243V clamping voltage, 2.5A peak pulse current) and DO-214AA packaging. The operating temperature range differs minimally (-50°C to 150°C versus -55°C to 150°C), which is acceptable for most general-purpose applications. SMBJ150A is active in production with substantial inventory availability (71,200 pcs), ensuring long-term supply continuity. Both parts are ROHS3 compliant and carry identical HTSUS and ECCN classifications.

Alternative Selections (Voltage-Dependent Applications):

Vishay P6SMB series parts offer active production status and extended lower temperature operation (-65°C). However, these alternatives present voltage deviations:

P6SMB150A-M3/52 and P6SMB150A-M3/5B: 128V VWM, 207V clamping (lower than original specification)
P6SMB160A-M3/52 and P6SMB160A-M3/5B: 136V VWM, 219V clamping (intermediate voltage)
P6SMB170A-M3/52 and P6SMB170A-M3/5B: 145V VWM, 234V clamping (closest to original)

SM6T150A-M3/52 from Vishay exhibits identical voltage characteristics to P6SMB150A variants (128V VWM, 207V clamping) with higher peak pulse current capability (2.9A).

Selection of voltage-variant alternatives requires circuit analysis to confirm that the modified clamping voltage remains within acceptable protection thresholds for the protected circuitry.

Frequently Asked Questions (FAQ)

Q: Can SMBJ150A directly replace CD214B-T150ALF without circuit modification?

A: Yes. SMBJ150A maintains identical reverse standoff voltage (150V), breakdown voltage (167V minimum), and clamping voltage (243V maximum) specifications. The DO-214AA package is mechanically and electrically compatible. The -50°C to 150°C operating range is acceptable for applications not requiring the extended -55°C lower limit of the original part.

Q: Why do Vishay P6SMB and SM6T series parts show different voltage ratings?

A: These are distinct product lines with different voltage grades. P6SMB150A and SM6T150A are rated at 128V VWM, not 150V. The "150" in the part number refers to the voltage grade within each series, not an absolute voltage specification. Direct voltage comparison requires consulting the datasheet voltage tables.

Q: Are the P6SMB160A and P6SMB170A parts suitable substitutes?

A: These parts are similar alternatives, not direct equivalents. P6SMB160A operates at 136V VWM with 219V clamping; P6SMB170A operates at 145V VWM with 234V clamping. Both deviate from the original 150V / 243V specification. Suitability depends on whether the circuit can tolerate the modified protection voltage. Engineering evaluation of the protected circuit is required.

Q: What is the difference between P6SMB150A-M3/52 and P6SMB150A-M3/5B?

A: Both parts are electrically identical (128V VWM, 207V clamping, 2.9A Ipp). The suffix difference (-M3/52 versus -M3/5B) indicates packaging configuration. -M3/52 is supplied in Cut Tape (CT) or Tape & Box (TB) format; -M3/5B is supplied in Tape & Box (TB) format. Electrical performance is equivalent.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SMBJ150A and all Vishay P6SMB and SM6T variants listed are ROHS3 compliant. Moisture sensitivity level is MSL 1 (Unlimited) across all parts, matching the original specification.

Q: Does the higher peak pulse current (2.9A) of P6SMB150A and SM6T150A provide better protection?

A: Higher peak pulse current capability indicates greater transient energy handling capacity. However, this does not compensate for the lower clamping voltage (207V versus 243V). Circuit protection effectiveness depends on both parameters working within the design specification. Substitution requires verification that the modified clamping voltage is acceptable.

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