CD214B-T70CALF Equivalent & Substitute Parts

Part Overview

The CD214B-T70CALF is a 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 currently obsolete, making equivalent substitutes necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214B-T70CALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Package / Case	DO-214AA, SMB
Voltage - Reverse Standoff (Typ)	70V
Voltage - Breakdown (Min)	77.8V
Voltage - Clamping (Max) @ Ipp	113V
Current - Peak Pulse (10/1000µs)	5.3A
Power - Peak Pulse	600W
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Bidirectional Channels	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the CD214B-T70CALF is determined by the following critical parameters:

Primary Matching Criteria:

Reverse Standoff Voltage: 70V (±5V tolerance acceptable for similar voltage class)
Voltage - Clamping (Max) @ Ipp: 113V (±10V tolerance acceptable)
Current - Peak Pulse (10/1000µs): 5.3A (±0.5A tolerance acceptable)
Package / Case: DO-214AA, SMB (mandatory for PCB compatibility)
Mounting Type: Surface Mount (mandatory)
Bidirectional Channels: 1 (mandatory)

Secondary Compatibility Factors:

Operating Temperature Range: Minimum -55°C required
Power - Peak Pulse: 600W (standard for SMB package)
RoHS3 Compliance: Required for modern supply chains
Moisture Sensitivity Level: MSL 1 acceptable

Substitute parts are categorized as follows:

Direct Equivalents: Parts matching all primary criteria with identical electrical performance (SMBJ70CA variants from multiple manufacturers).

Similar Equivalents: Parts with matching standoff voltage and clamping voltage but minor variations in peak pulse current or operating temperature range (SMBJ70CA-T7, SMBJ70CA-TP, SMBJ70CA-TR).

Voltage Class Alternatives: Parts within the same voltage protection class but with different standoff or clamping voltages (SMBJ75CA at 75V standoff, SMBJ64CA at 64V standoff).

Enhanced Performance Variants: Parts with higher peak pulse current capability or automotive qualification (SM6T82CAY with 27A peak pulse current).

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Operating Temp (°C)	Product Status	Package
CD214B-T70CALF	Bourns Inc.	70	77.8	113	5.3	-55 ~ 150	Obsolete	DO-214AA, SMB
SMBJ70CA	Semtech Corporation	70	77.8	113	5.3	-55 ~ 175	Active	DO-214AA, SMB
SMBJ70CA-T7	Littelfuse Inc.	70	77.8	113	5.3	-65 ~ 150	Active	DO-214AA, SMB
SMBJ70CA-TP	Micro Commercial Co	70	77.8	113	5.3	-55 ~ 175	Active	DO-214AA, SMB
SMBJ70CA-TR	STMicroelectronics	70	77.8	113	5.5	-55 ~ 150	Active	DO-214AA, SMB
TV06B700JB-HF	Comchip Technology	70	77.8	113	5.31	Not specified	Active	DO-214AA, SMB
SMBJ75CA	MDD	75	83.3	121	5.3	-50 ~ 150	Active	DO-214AA, SMB
SMBJ64CA	Meritek	64	71.1	103	5.83	-55 ~ 150	Active	DO-214AA, SMB
SM6T82CAY	STMicroelectronics	70	77.8	146	27	-55 ~ 150	Active	DO-214AA, SMB

Engineering Selection Recommendations

Preferred Direct Substitutes:

SMBJ70CA (Semtech Corporation) and SMBJ70CA-TP (Micro Commercial Co) are the primary recommended substitutes. Both parts match all critical electrical parameters of the CD214B-T70CALF and are in active production status. SMBJ70CA-TP offers an extended upper operating temperature of 175°C compared to the original 150°C specification. Both parts maintain ROHS3 compliance and MSL 1 rating.

Alternative Direct Substitutes:

SMBJ70CA-T7 (Littelfuse Inc.) and SMBJ70CA-TR (STMicroelectronics) provide equivalent electrical performance with active product status. SMBJ70CA-T7 extends the lower operating temperature to -65°C. SMBJ70CA-TR is available in Tape & Reel packaging and features a marginally higher peak pulse current of 5.5A.

Voltage Class Alternatives:

SMBJ75CA (MDD) operates at 75V standoff voltage with 121V clamping voltage, suitable for applications requiring higher voltage margin. SMBJ64CA (Meritek) operates at 64V standoff voltage with 103V clamping voltage, appropriate for lower voltage protection circuits. These alternatives are only suitable if the circuit design permits voltage class variation.

Enhanced Performance Option:

SM6T82CAY (STMicroelectronics) provides significantly higher peak pulse current capability (27A) at the same 70V standoff voltage. This part includes AEC-Q101 automotive qualification and is suitable for high-energy transient suppression applications. The higher clamping voltage (146V) requires circuit-level evaluation.

Selection Criteria:

Choose SMBJ70CA or SMBJ70CA-TP for direct replacement in existing designs. Select SMBJ70CA-T7 if extended lower temperature operation is required. Consider SM6T82CAY only if higher transient energy absorption is necessary and circuit design permits the higher clamping voltage.

Frequently Asked Questions (FAQ)

Q: Can SMBJ70CA directly replace CD214B-T70CALF without PCB modification?

A: Yes. SMBJ70CA matches the CD214B-T70CALF in all critical electrical parameters (70V standoff, 113V clamping, 5.3A peak pulse) and uses the identical DO-214AA (SMB) package. No PCB layout changes are required.

Q: What is the difference between SMBJ70CA variants (SMBJ70CA-T7, SMBJ70CA-TP, SMBJ70CA-TR)?

A: These variants represent different manufacturer implementations and packaging options of the same electrical specification. SMBJ70CA-T7 (Littelfuse) extends lower temperature to -65°C. SMBJ70CA-TP (Micro Commercial Co) extends upper temperature to 175°C. SMBJ70CA-TR (STMicroelectronics) is supplied in Tape & Reel format. All three are electrically equivalent for standard applications.

Q: Is SMBJ75CA compatible with CD214B-T70CALF?

A: SMBJ75CA is not a direct equivalent. It operates at 75V standoff voltage versus 70V, with 121V clamping voltage versus 113V. Use SMBJ75CA only if the circuit design permits operation at the higher voltage class. This part is suitable for circuits requiring additional voltage margin.

Q: Why does SM6T82CAY have different electrical characteristics?

A: SM6T82CAY is designed for high-energy transient suppression with 27A peak pulse current versus 5.3A in the original part. The higher clamping voltage (146V) reflects its enhanced performance capability. This part is suitable only for applications requiring higher transient energy absorption and where circuit design permits the higher clamping voltage.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 moisture sensitivity rating, meeting modern supply chain requirements.

Q: What is the impact of operating temperature range differences?

A: The original CD214B-T70CALF specifies -55°C to 150°C. SMBJ70CA-TP extends the upper limit to 175°C, providing additional thermal margin. SMBJ70CA-T7 extends the lower limit to -65°C for cold environment applications. These differences are only significant if the application operates at temperature extremes beyond the original specification.

Q: Can I use SMBJ64CA as a substitute?

A: SMBJ64CA operates at 64V standoff voltage, which is 6V lower than the original 70V specification. Use this part only if circuit design permits operation at the lower voltage class. It is not suitable for direct replacement in circuits requiring 70V protection.

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