CD214B-T7.0ALF Equivalent & Substitute Parts

Part Overview

The CD214B-T7.0ALF is a 7V Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This unidirectional Zener diode features a 12V maximum clamping voltage, 50A peak pulse current capability, and 600W peak pulse power rating in a DO-214AA (SMB) package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214B-T7.0ALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Product Status	Obsolete
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	7V
Voltage - Breakdown (Min)	7.78V
Voltage - Clamping (Max) @ Ipp	12V
Current - Peak Pulse (10/1000µs)	50A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Operating Temperature Range	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD214B-T7.0ALF is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 7V ±tolerance
Voltage - Clamping (Max) @ Ipp: 12V maximum
Current - Peak Pulse (10/1000µs): 50A minimum
Power - Peak Pulse: 600W minimum
Package / Case: DO-214AA (SMB) surface mount
Unidirectional Zener configuration

Substitution Categories:

Direct Equivalents maintain all critical electrical parameters within the same tolerance band. These parts are pin-compatible and functionally identical for the specified application.

Upgrade Substitutes offer enhanced performance characteristics (extended temperature range, improved reliability features, or higher current ratings) while maintaining backward compatibility with the original circuit design.

Similar Alternatives provide comparable voltage clamping and current handling but may have minor variations in standoff voltage or peak pulse current. These require circuit-level verification to confirm suitability.

Parameter Comparison

Part Number	Manufacturer	Status	Vwm (Typ)	Vc (Max)	Ipp (A)	Power (W)	Temp Range	Package
CD214B-T7.0ALF	Bourns Inc.	Obsolete	7V	12V	50A	600W	-55°C ~ 150°C	DO-214AA (SMB)
SMBJ7.0A	MDD	Active	7V	12V	50A	600W	-50°C ~ 150°C	DO-214AA (SMB)
SMBJ7.0A-HR	Littelfuse Inc.	Active	7V	12V	50A	600W	-65°C ~ 150°C	DO-214AA (SMB)
1KSMB8.2A	Littelfuse Inc.	Active	7.02V	12.1V	82.6A	1000W	-55°C ~ 150°C	DO-214AA (SMB)
P6SMB6.8A-M3/52	Vishay General Semiconductor	Active	5.8V	10.5V	57.1A	600W	-65°C ~ 150°C	DO-214AA (SMB)
P6SMB6.8A-M3/5B	Vishay General Semiconductor	Active	5.8V	10.5V	57.1A	600W	-65°C ~ 150°C	DO-214AA (SMB)
P6SMB7.5A-M3/52	Vishay General Semiconductor	Active	6.4V	11.3V	53.1A	600W	-65°C ~ 150°C	DO-214AA (SMB)
P6SMB7.5A-M3/5B	Vishay General Semiconductor	Active	6.4V	11.3V	53.1A	600W	-65°C ~ 150°C	DO-214AA (SMB)
P6SMB8.2A	Taiwan Semiconductor Corporation	Active	7.02V	12.1V	52A	600W	-55°C ~ 150°C	DO-214AA (SMB)
P6SMB8.2A-E3/52	Vishay General Semiconductor	Active	7.02V	12.1V	49.6A	600W	-65°C ~ 150°C	DO-214AA (SMB)

Engineering Selection Recommendations

Direct Replacement (Preferred): SMBJ7.0A (MDD) and SMBJ7.0A-HR (Littelfuse Inc.) are direct functional equivalents with identical electrical specifications. Both are active products with full RoHS3 compliance and MSL 1 rating. SMBJ7.0A-HR offers an extended lower temperature operating range (-65°C vs. -50°C), making it suitable for applications requiring enhanced cold-temperature performance.

Upgrade Option: SMBJ7.0A-HR (Littelfuse Inc.) is recommended as the primary upgrade substitute due to its active product status, extended temperature range (-65°C ~ 150°C), and established reliability in high-volume applications. This part maintains full backward compatibility while providing superior long-term availability.

Alternative Selections: P6SMB8.2A (Taiwan Semiconductor Corporation) and P6SMB8.2A-E3/52 (Vishay) provide comparable performance with marginally higher peak pulse current (49.6A to 52A) and clamping voltage (12.1V). These parts are suitable where slightly elevated voltage clamping is acceptable. P6SMB8.2A-E3/52 offers extended temperature range (-65°C) for demanding thermal environments.

1KSMB8.2A (Littelfuse Inc.) provides enhanced current handling (82.6A) and power dissipation (1000W), suitable for applications requiring higher transient energy absorption. This part is appropriate only where circuit design permits the higher clamping voltage (12.1V).

P6SMB6.8A and P6SMB7.5A series (Vishay) represent lower voltage alternatives with reduced standoff and clamping voltages. These are suitable only for circuits designed for lower voltage protection thresholds and require explicit circuit verification.

All recommended substitutes maintain DO-214AA (SMB) package compatibility, RoHS3 compliance, and MSL 1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can SMBJ7.0A directly replace CD214B-T7.0ALF without circuit modification? A: Yes. SMBJ7.0A maintains identical reverse standoff voltage (7V), clamping voltage (12V), and peak pulse current (50A) specifications. Both are unidirectional Zener diodes in DO-214AA (SMB) packages with identical pinout and footprint compatibility.

Q: What is the difference between SMBJ7.0A (MDD) and SMBJ7.0A-HR (Littelfuse)? A: Both parts are electrically identical with matching voltage and current ratings. The primary difference is operating temperature range: MDD version operates -50°C to 150°C, while Littelfuse SMBJ7.0A-HR extends to -65°C minimum. Littelfuse is recommended for applications requiring enhanced cold-temperature performance or where long-term availability is critical.

Q: Why are P6SMB8.2A parts listed as alternatives if they have different voltage ratings? A: P6SMB8.2A parts have a reverse standoff voltage of 7.02V (vs. 7V) and clamping voltage of 12.1V (vs. 12V). These minor variations fall within typical circuit tolerance margins for general-purpose overvoltage protection. However, circuit-level verification is required to confirm acceptability in voltage-sensitive applications.

Q: Can I use 1KSMB8.2A as a substitute? A: 1KSMB8.2A is functionally compatible but offers enhanced performance: 82.6A peak pulse current (vs. 50A) and 1000W power dissipation (vs. 600W). The higher clamping voltage (12.1V vs. 12V) may affect circuit behavior in voltage-sensitive designs. Use only where circuit design permits the higher clamping voltage and enhanced current handling is beneficial.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original CD214B-T7.0ALF specifications.

Q: What packaging options are available for these substitutes? A: All substitute parts are supplied in DO-214AA (SMB) surface-mount packages. Specific tape & reel (TR) or tape & box (TB) packaging options vary by manufacturer and part number. Verify packaging availability with your supplier for production requirements.

Q: Which substitute offers the best long-term availability? A: SMBJ7.0A-HR (Littelfuse Inc.) is recommended for long-term availability due to its active product status, established market presence, and broad distribution through major component suppliers. Littelfuse maintains consistent production volumes and supply chain stability for this part family.

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