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CD214B-T33CALF Equivalent & Substitute Parts
Part Overview
The CD214B-T33CALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface mount applications. This bidirectional zener diode operates at 33V reverse standoff with a 53.3V maximum clamping voltage and 11.3A peak pulse current capability in the DO-214AA (SMB) package format. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and component sourcing.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | CD214B-T33CALF | — |
| Manufacturer | Bourns Inc. | — |
| Category | Transient Voltage Suppressors (TVS) | — |
| Package / Case | DO-214AA, SMB | — |
| Voltage - Reverse Standoff (Typ) | 33 | V |
| Voltage - Breakdown (Min) | 36.7 | V |
| Voltage - Clamping (Max) @ Ipp | 53.3 | V |
| Current - Peak Pulse (10/1000µs) | 11.3 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Bidirectional Channels | 1 | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
| Product Status | Obsolete | — |
Substitute Part Grouping Explanation
Substitution for the CD214B-T33CALF is determined by strict electrical and mechanical parameter matching within the TVS diode category. The critical parameters that define substitutability are:
Primary Matching Criteria:
- Voltage - Reverse Standoff (Typ): 33V
- Voltage - Clamping (Max) @ Ipp: 53.3V
- Current - Peak Pulse (10/1000µs): 11.3A
- Package / Case: DO-214AA, SMB
- Bidirectional Channels: 1
- Power - Peak Pulse: 600W
- Mounting Type: Surface Mount
Direct Equivalents maintain all electrical parameters within specification. The SMBJ33CA from MDD meets all primary criteria with identical voltage and current ratings.
Similar Alternatives provide comparable protection performance with minor parameter variations. The P6SMB series from Vishay (P6SMB36CA, P6SMB39CA, P6SMB43CA variants) operate within the same voltage and power class but with different standoff and clamping voltage points. These are suitable where the exact voltage rating is not critical to the application.
Parameter Comparison
| Parameter | CD214B-T33CALF (Main) | SMBJ33CA (MDD) | P6SMB36CA-M3/52 | P6SMB39CA-M3/52 | P6SMB43CA-M3/52 |
|---|---|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 33V | 33V | 30.8V | 33.3V | 36.8V |
| Voltage - Breakdown (Min) | 36.7V | 36.7V | 34.2V | 37.1V | 40.9V |
| Voltage - Clamping (Max) @ Ipp | 53.3V | 53.3V | 49.9V | 53.9V | 59.3V |
| Current - Peak Pulse (10/1000µs) | 11.3A | 11.3A | 12A | 11.1A | 10.1A |
| Power - Peak Pulse | 600W | 600W | 600W | 600W | 600W |
| Operating Temperature Range | -55 to 150°C | -50 to 150°C | -65 to 150°C | -65 to 150°C | -65 to 150°C |
| Package / Case | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active | Active | Active | Active |
Engineering Selection Recommendations
Direct Replacement: The SMBJ33CA from MDD is the primary direct equivalent for CD214B-T33CALF. It maintains identical electrical specifications (33V standoff, 53.3V clamping, 11.3A peak pulse) and package format. The part is currently in active production status with substantial inventory availability (25,840 pcs), ensuring long-term supply continuity. Both parts are ROHS3 compliant with MSL 1 rating.
Alternative Selection Criteria: The Vishay P6SMB series provides active alternatives when supply constraints exist. Selection among P6SMB36CA, P6SMB39CA, and P6SMB43CA variants depends on application voltage tolerance:
- P6SMB36CA variants: 30.8V standoff, 49.9V clamping. Suitable for applications tolerating lower voltage thresholds.
- P6SMB39CA variants: 33.3V standoff, 53.9V clamping. Closest electrical match to the original specification.
- P6SMB43CA variants: 36.8V standoff, 59.3V clamping. For applications requiring higher voltage protection margins.
All Vishay alternatives maintain 600W peak pulse power rating, DO-214AA package compatibility, and ROHS3 compliance. Operating temperature ranges extend to -65°C minimum, exceeding the original -55°C specification.
Frequently Asked Questions (FAQ)
Q: Can SMBJ33CA directly replace CD214B-T33CALF without circuit modification? A: Yes. The SMBJ33CA maintains identical voltage ratings (33V standoff, 53.3V clamping) and current specifications (11.3A peak pulse). Both use the DO-214AA (SMB) package with identical pinout and thermal characteristics. No circuit changes are required.
Q: What is the difference between direct equivalents and similar alternatives? A: Direct equivalents (SMBJ33CA) match all electrical parameters exactly. Similar alternatives (P6SMB series) operate in the same voltage class but with different standoff and clamping points. Direct equivalents are preferred for drop-in replacement; alternatives require application review to confirm voltage tolerance.
Q: Are the Vishay P6SMB36CA and P6SMB39CA interchangeable with CD214B-T33CALF? A: Both are mechanically compatible (DO-214AA package) and electrically similar but not identical. P6SMB36CA operates at 30.8V standoff (lower threshold), while P6SMB39CA operates at 33.3V standoff (closest match). Application-specific voltage requirements determine suitability. Verify that the lower or higher clamping voltage does not affect circuit performance.
Q: Does operating temperature range affect substitution decisions? A: The original CD214B-T33CALF operates -55 to 150°C. SMBJ33CA operates -50 to 150°C (5°C higher minimum). Vishay P6SMB variants operate -65 to 150°C (10°C lower minimum). For applications requiring -55°C operation, SMBJ33CA is acceptable. For -65°C operation, Vishay alternatives are required.
Q: Are all substitute parts ROHS3 compliant? A: Yes. CD214B-T33CALF, SMBJ33CA, and all Vishay P6SMB variants listed are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level). All parts meet current environmental and regulatory requirements.
Q: What packaging options are available for these TVS diodes? A: All parts use DO-214AA (SMB) surface mount package. Vishay P6SMB variants are available in Tape & Box (TB) and Tape & Reel (TR) configurations. MDD SMBJ33CA availability is listed as standard stock. Confirm packaging format with supplier based on assembly requirements.
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