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CD214B-T22ALF Equivalent & Substitute Parts
Part Overview
The CD214B-T22ALF 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 22V reverse standoff voltage with a 35.5V maximum clamping voltage and 16.9A peak pulse current capability in the DO-214AA (SMB) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | CD214B-T22ALF |
| Manufacturer | Bourns Inc. |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Voltage - Reverse Standoff (Typ) | 22V |
| Voltage - Breakdown (Min) | 24.4V |
| Voltage - Clamping (Max) @ Ipp | 35.5V |
| Current - Peak Pulse (10/1000µs) | 16.9A |
| Power - Peak Pulse | 600W |
| Package / Case | DO-214AA, SMB |
| Operating Temperature | -55°C ~ 150°C (TJ) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitute parts for the CD214B-T22ALF are categorized into two groups based on electrical parameter alignment:
Direct Equivalents maintain identical electrical specifications across all critical parameters: 22V reverse standoff voltage, 24.4V minimum breakdown voltage, 35.5V maximum clamping voltage, and 16.9A peak pulse current. These parts are functionally interchangeable without circuit redesign.
Similar Alternatives provide comparable overvoltage protection with minor parameter variations. These parts operate within the same voltage class but exhibit different clamping voltages and peak pulse currents. Selection of similar alternatives requires verification that the application tolerates the specified parameter deviations.
The key parameters determining substitution eligibility are:
- Reverse standoff voltage (Typ)
- Breakdown voltage (Min)
- Clamping voltage (Max) @ Ipp
- Peak pulse current (10/1000µs)
- Package type (DO-214AA/SMB)
- Operating temperature range
Parameter Comparison
| Part Number | Manufacturer | Standoff Voltage (V) | Breakdown Voltage (V) | Clamping Voltage (V) | Peak Pulse Current (A) | Package | Status | RoHS |
|---|---|---|---|---|---|---|---|---|
| CD214B-T22ALF | Bourns Inc. | 22 | 24.4 | 35.5 | 16.9 | DO-214AA (SMB) | Obsolete | ROHS3 |
| SMBJ22A | Meritek | 22 | 24.4 | 35.5 | 16.9 | DO-214AA (SMB) | Active | ROHS3 |
| P6SMB22A-E3/5B | Vishay General Semiconductor - Diodes Division | 18.8 | 20.9 | 30.6 | 19.6 | DO-214AA (SMB) | Active | ROHS3 |
| P6SMB22A-M3/52 | Vishay General Semiconductor - Diodes Division | 18.8 | 20.9 | 30.6 | 19.6 | DO-214AA (SMB) | Active | ROHS3 |
| P6SMB22A-M3/5B | Vishay General Semiconductor - Diodes Division | 18.8 | 20.9 | 30.6 | 19.6 | DO-214AA (SMB) | Active | ROHS3 |
| P6SMB24A-M3/52 | Vishay General Semiconductor - Diodes Division | 20.5 | 22.8 | 33.2 | 18.1 | DO-214AA (SMB) | Active | ROHS3 |
| P6SMB24A-M3/5B | Vishay General Semiconductor - Diodes Division | 20.5 | 22.8 | 33.2 | 18.1 | DO-214AA (SMB) | Active | ROHS3 |
| P6SMB27A-M3/52 | Vishay General Semiconductor - Diodes Division | 23.1 | 25.7 | 37.5 | 16 | DO-214AA (SMB) | Active | ROHS3 |
| P6SMB27A-M3/5B | Vishay General Semiconductor - Diodes Division | 23.1 | 25.7 | 37.5 | 16 | DO-214AA (SMB) | Active | ROHS3 |
Engineering Selection Recommendations
Direct Equivalent Selection:
The SMBJ22A from Meritek provides a direct electrical equivalent to the CD214B-T22ALF with identical standoff voltage, breakdown voltage, clamping voltage, and peak pulse current specifications. This part is currently in active production status and maintains ROHS3 compliance. The SMBJ22A is the primary recommended substitute for direct replacement applications.
Similar Alternative Selection:
The P6SMB series from Vishay General Semiconductor offers active production alternatives with voltage ratings spanning the 22V to 27V range. These parts are suitable for applications where minor parameter variations are acceptable:
- P6SMB22A variants (18.8V standoff) provide lower voltage protection with higher peak pulse current (19.6A) and extended operating temperature range (-65°C to 150°C).
- P6SMB24A variants (20.5V standoff) offer intermediate voltage protection with 33.2V clamping voltage.
- P6SMB27A variants (23.1V standoff) provide higher voltage protection with 37.5V clamping voltage, closest to the original CD214B-T22ALF clamping specification.
All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and DO-214AA (SMB) package compatibility. Selection between similar alternatives depends on specific circuit voltage requirements and current handling needs.
Frequently Asked Questions (FAQ)
Q: Can SMBJ22A be used as a direct replacement for CD214B-T22ALF?
A: Yes. The SMBJ22A matches all critical electrical parameters: 22V standoff voltage, 24.4V breakdown voltage, 35.5V clamping voltage, and 16.9A peak pulse current. Both parts use the DO-214AA (SMB) package and are ROHS3 compliant. No circuit modifications are required.
Q: What is the difference between direct equivalents and similar alternatives?
A: Direct equivalents (SMBJ22A) maintain identical electrical specifications across all parameters. Similar alternatives (P6SMB series) operate in the same voltage protection class but with different standoff voltages, clamping voltages, and peak pulse currents. Similar alternatives require circuit analysis to confirm compatibility.
Q: Are the P6SMB22A variants interchangeable with CD214B-T22ALF?
A: The P6SMB22A variants have lower standoff voltage (18.8V vs. 22V) and lower clamping voltage (30.6V vs. 35.5V), but higher peak pulse current (19.6A vs. 16.9A). These parts provide protection at lower voltage thresholds. Use only if your circuit operates at lower voltage levels and can tolerate the reduced clamping voltage.
Q: Why do P6SMB27A variants have higher clamping voltage than the original part?
A: The P6SMB27A series has a 23.1V standoff voltage (compared to 22V) and 37.5V clamping voltage (compared to 35.5V). This higher voltage rating provides protection for circuits operating at slightly elevated voltage levels. Verify that your circuit design accommodates the higher clamping voltage before selection.
Q: Are all substitute parts available in the same package?
A: Yes. All substitute parts listed use the DO-214AA (SMB) package, ensuring mechanical and electrical compatibility with existing PCB layouts and solder profiles.
Q: What compliance certifications apply to substitute parts?
A: All substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original CD214B-T22ALF specifications. All parts are classified under HTSUS code 8541.10.0080 and ECCN EAR99.
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