CD214B-T70ALF Equivalent & Substitute Parts

Part Overview

The CD214B-T70ALF is a unidirectional transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 70V reverse standoff voltage with 113V maximum clamping voltage and 5.3A peak pulse current capability in the DO-214AA (SMB) package format. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	70V
Breakdown Voltage (Min)	77.8V
Clamping Voltage (Max) @ Ipp	113V
Peak Pulse Current (10/1000µs)	5.3A
Peak Pulse Power	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CD214B-T70ALF is determined by strict electrical and mechanical parameter matching within the TVS diode category. The critical parameters that define substitutability are:

Electrical Parameters (Must Match):

Reverse standoff voltage: 70V
Breakdown voltage minimum: 77.8V
Package / case format: DO-214AA (SMB)
Mounting type: Surface Mount
Peak pulse power rating: 600W
Unidirectional channel configuration: 1 channel

Acceptable Variation Range:

Clamping voltage (Max) @ Ipp: 100V to 146V (within transient suppression design tolerance)
Peak pulse current: 5.3A to 27A (higher current capability remains compatible)
Operating temperature range: -55°C to -50°C minimum; 150°C to 175°C maximum

Compliance Requirements:

RoHS3 compliance mandatory
MSL rating 1 (Unlimited) required
Active product status preferred for long-term availability

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage	Breakdown Voltage (Min)	Clamping Voltage (Max)	Peak Pulse Current	Package	Product Status	Operating Temp Range
CD214B-T70ALF	Bourns Inc.	70V	77.8V	113V	5.3A	DO-214AA, SMB	Obsolete	-55°C ~ 150°C
SMBJ70A	MDD	70V	77.8V	113V	5.3A	DO-214AA, SMB	Active	-50°C ~ 150°C
SMBJ70A-TP	Micro Commercial Co	70V	77.8V	113V	5.3A	DO-214AA, SMB	Active	-55°C ~ 175°C
SMBJ70A-TR	STMicroelectronics	70V	77.8V	113V	5.5A	DO-214AA, SMB	Active	-55°C ~ 150°C
SMBT70A-13-F	Diodes Incorporated	70V	77.8V	100V	5.3A	DO-214AA, SMB	Active	-55°C ~ 150°C
TV06B700J-HF	Comchip Technology	70V	77.8V	113V	5.31A	DO-214AA, SMB	Active	-
TV06B700J-G	Comchip Technology	70V	77.8V	113V	5.31A	DO-214AA, SMB	Active	-
SMBJ64A-HR	Littelfuse Inc.	64V	71.1V	103V	5.9A	DO-214AA, SMB	Active	-65°C ~ 150°C
SM6T82AY	STMicroelectronics	70V	77.8V	146V	27A (8/20µs)	DO-214AA, SMB	Active	-55°C ~ 150°C

Engineering Selection Recommendations

Direct Equivalents (Preferred for Replacement):

SMBJ70A (MDD), SMBJ70A-TP (Micro Commercial Co), and SMBJ70A-TR (STMicroelectronics) provide direct electrical equivalence to the CD214B-T70ALF with identical standoff voltage (70V), breakdown voltage (77.8V), clamping voltage (113V), and peak pulse current (5.3A to 5.5A). All three are active products with RoHS3 compliance and MSL rating 1. SMBJ70A-TP offers the widest operating temperature range (-55°C to 175°C), while SMBJ70A-TR and SMBJ70A maintain the original -55°C to 150°C specification.

Compatible Alternatives (Acceptable for Most Applications):

SMBT70A-13-F (Diodes Incorporated) and TV06B700J-HF / TV06B700J-G (Comchip Technology) maintain the 70V standoff voltage and 5.3A peak pulse current but feature slightly lower clamping voltages (100V and 113V respectively). These parts are suitable where the lower clamping voltage remains within circuit protection requirements. All are active products with RoHS3 compliance.

Limited Compatibility (Voltage Derating Required):

SMBJ64A-HR (Littelfuse Inc.) operates at 64V standoff voltage with 71.1V breakdown voltage, representing a 6V reduction from the original specification. This part is suitable only for applications where the lower voltage threshold does not compromise circuit protection strategy. Higher peak pulse current (5.9A) provides additional margin.

Enhanced Performance Alternative:

SM6T82AY (STMicroelectronics) maintains 70V standoff voltage but features significantly higher peak pulse current (27A at 8/20µs) and clamping voltage (146V). This part is suitable for applications requiring enhanced transient suppression capability and includes AEC-Q101 automotive qualification. Higher clamping voltage may require circuit re-evaluation.

Frequently Asked Questions (FAQ)

Q: Can SMBJ70A replace CD214B-T70ALF directly?

A: Yes. SMBJ70A matches all critical electrical parameters: 70V standoff voltage, 77.8V breakdown voltage, 113V clamping voltage, and 5.3A peak pulse current. Both use DO-214AA (SMB) surface-mount packaging. SMBJ70A is an active product, addressing the obsolescence of the original part.

Q: What is the difference between SMBJ70A-TP and SMBJ70A-TR?

A: Both parts are electrically identical with 70V standoff voltage and 113V clamping voltage. SMBJ70A-TP (Micro Commercial Co) operates from -55°C to 175°C, while SMBJ70A-TR (STMicroelectronics) operates from -55°C to 150°C. Selection depends on application temperature requirements. SMBJ70A-TP provides wider thermal range.

Q: Why is SMBJ64A-HR listed as a substitute if the voltage is lower?

A: SMBJ64A-HR is classified as a similar part rather than a direct equivalent. The 64V standoff voltage represents a 6V reduction from the 70V specification. This part is suitable only for applications where the lower voltage threshold remains acceptable for circuit protection. Verify circuit requirements before substitution.

Q: Can SM6T82AY be used as a drop-in replacement?

A: SM6T82AY maintains 70V standoff voltage and DO-214AA packaging but features significantly higher peak pulse current (27A) and clamping voltage (146V). While electrically compatible, the higher clamping voltage may affect circuit behavior. This part is suitable for applications requiring enhanced transient suppression. Circuit validation is necessary.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification and MSL rating 1 (Unlimited), matching the environmental and moisture sensitivity requirements of the original CD214B-T70ALF.

Q: What packaging options are available for these substitutes?

A: All substitute parts use DO-214AA (SMB) surface-mount packaging, matching the original part. Packaging variants (Tape & Reel, Cut Tape, Digi-Reel) differ by supplier but do not affect electrical performance or PCB compatibility.

Q: Which substitute offers the best long-term availability?

A: SMBJ70A (MDD) and SMBJ70A-TR (STMicroelectronics) are active products with substantial inventory levels (17,200 and 12,900 units respectively), providing strong long-term availability. Both are direct electrical equivalents to the obsolete CD214B-T70ALF.

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