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CD214B-T43CALF Equivalent & Substitute Parts
Part Overview
The CD214B-T43CALF 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 with a 43V reverse standoff voltage and 69.4V maximum clamping voltage, delivering 8.6A peak pulse current in a compact SMB (DO-214AA) package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Reverse Standoff Voltage (Typ) | 43 | V |
| Breakdown Voltage (Min) | 47.8 | V |
| Clamping Voltage (Max) @ Ipp | 69.4 | V |
| Peak Pulse Current (10/1000µs) | 8.6 | A |
| Peak Pulse Power | 600 | W |
| Package / Case | DO-214AA, SMB | — |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Bidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the CD214B-T43CALF is determined by strict alignment of the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Reverse standoff voltage: 43V (±tolerance)
- Clamping voltage: 69.4V maximum
- Peak pulse current: 8.6A minimum
- Package type: DO-214AA / SMB form factor
- Bidirectional configuration: Single channel
- Peak pulse power rating: 600W minimum
Direct Equivalents maintain all primary parameters within specification limits and are classified as active products with current manufacturing status.
Similar Alternatives exhibit variations in one or more electrical parameters (standoff voltage, clamping voltage, or peak current) while preserving the same package and general application category. These parts are suitable only when circuit design tolerances accommodate the parameter deviations.
Parameter Comparison
| Part Number | Manufacturer | Status | Standoff Voltage (V) | Breakdown Min (V) | Clamp Voltage (V) | Peak Current (A) | Package | Temp Range (°C) |
|---|---|---|---|---|---|---|---|---|
| CD214B-T43CALF | Bourns Inc. | Obsolete | 43 | 47.8 | 69.4 | 8.6 | DO-214AA, SMB | -55 to 150 |
| SMBJ43CA | MDD | Active | 43 | 47.8 | 69.4 | 8.7 | DO-214AA, SMB | -50 to 150 |
| P6SMB47CA-M3/52 | Vishay | Active | 40.2 | 44.7 | 64.8 | 9.3 | DO-214AA, SMB | -65 to 150 |
| P6SMB47CA-M3/5B | Vishay | Active | 40.2 | 44.7 | 64.8 | 9.3 | DO-214AA, SMB | -65 to 150 |
| P6SMB51CA-M3/52 | Vishay | Active | 43.6 | 48.5 | 70.1 | 8.6 | DO-214AA, SMB | -65 to 150 |
| P6SMB51CA-M3/5B | Vishay | Active | 43.6 | 48.5 | 70.1 | 8.6 | DO-214AA, SMB | -65 to 150 |
| P6SMB56CA-M3/52 | Vishay | Active | 47.8 | 53.2 | 77 | 7.8 | DO-214AA, SMB | -65 to 150 |
| P6SMB56CA-M3/5B | Vishay | Active | 47.8 | 53.2 | 77 | 7.8 | DO-214AA, SMB | -65 to 150 |
Engineering Selection Recommendations
Direct Equivalent (Recommended for Drop-In Replacement):
SMBJ43CA (MDD) is the primary substitute for CD214B-T43CALF. This part maintains identical standoff voltage (43V), breakdown voltage (47.8V), and clamping voltage (69.4V) specifications. Peak pulse current is marginally higher at 8.7A versus 8.6A, providing equivalent or superior transient suppression performance. The part is active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Operating temperature range is -50°C to 150°C, which covers the majority of industrial and commercial applications, though the original part extends to -55°C minimum.
Similar Alternatives (Application-Dependent Selection):
Vishay P6SMB series parts (P6SMB47CA-M3/52, P6SMB47CA-M3/5B, P6SMB51CA-M3/52, P6SMB51CA-M3/5B, P6SMB56CA-M3/52, P6SMB56CA-M3/5B) are suitable substitutes when circuit design margins accommodate voltage and current variations. These TransZorb® devices offer extended operating temperature range (-65°C to 150°C) and are active products with ROHS3 compliance. Selection among these alternatives depends on specific overvoltage protection thresholds required by the application.
All substitute parts share identical package configuration (DO-214AA / SMB), single bidirectional channel architecture, 600W peak pulse power rating, and MSL 1 moisture sensitivity classification, ensuring mechanical and thermal compatibility with existing PCB layouts and assembly processes.
Frequently Asked Questions (FAQ)
Q: Can SMBJ43CA directly replace CD214B-T43CALF without circuit modification?
A: Yes. SMBJ43CA maintains all critical electrical parameters: 43V standoff voltage, 47.8V minimum breakdown voltage, and 69.4V maximum clamping voltage. The 0.1A increase in peak pulse current (8.7A vs. 8.6A) represents improved performance margin. Both parts use identical DO-214AA / SMB packaging. The only consideration is the operating temperature minimum: SMBJ43CA operates to -50°C versus CD214B-T43CALF at -55°C. For applications requiring -55°C operation, Vishay P6SMB51CA variants extend to -65°C minimum.
Q: What is the difference between P6SMB47CA and P6SMB51CA variants?
A: P6SMB47CA provides 40.2V standoff voltage with 64.8V clamping voltage and 9.3A peak current. P6SMB51CA provides 43.6V standoff voltage with 70.1V clamping voltage and 8.6A peak current. The P6SMB51CA series more closely matches the original CD214B-T43CALF electrical characteristics and is preferred when the 43V protection threshold is required. Both are available in -M3/52 and -M3/5B packaging variants.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. CD214B-T43CALF, SMBJ43CA, and all Vishay P6SMB series parts listed are ROHS3 compliant. All parts carry MSL 1 (unlimited) moisture sensitivity rating, ensuring compatibility with standard PCB assembly and storage conditions.
Q: What is the significance of the -M3/52 and -M3/5B packaging designations?
A: These designations indicate different tape and reel packaging configurations for automated assembly. -M3/52 and -M3/5B both use DO-214AA / SMB form factor with identical electrical performance. Selection between these variants depends on assembly equipment compatibility and supply chain availability. Both are mechanically and electrically interchangeable.
Q: Can P6SMB56CA replace CD214B-T43CALF?
A: P6SMB56CA is not a direct replacement. This part operates at 47.8V standoff voltage with 77V clamping voltage, representing a higher protection threshold than the original 43V / 69.4V specification. Use P6SMB56CA only when circuit design accommodates higher clamping voltage and the application requires protection at the 47.8V threshold level.
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