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CD214A-T15ALF Equivalent & Substitute Parts
Part Overview
The CD214A-T15ALF is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 15V reverse standoff voltage with a 24.4V maximum clamping voltage and 16.4A peak pulse current capability in a DO-214AC (SMA) package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 15V | V |
| Voltage - Breakdown (Min) | 16.7V | V |
| Voltage - Clamping (Max) @ Ipp | 24.4V | V |
| Current - Peak Pulse (10/1000µs) | 16.4A | A |
| Power - Peak Pulse | 400W | W |
| Operating Temperature Range | -55°C to 150°C | °C (TJ) |
| Package / Case | DO-214AC, SMA | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the CD214A-T15ALF are classified into two categories based on electrical parameter alignment:
Direct Equivalents maintain identical electrical specifications across all critical parameters: 15V reverse standoff voltage, 16.7V minimum breakdown voltage, 24.4V maximum clamping voltage, 16.4A peak pulse current, and 400W peak pulse power. These parts are pin-compatible and functionally interchangeable without circuit modification.
Similar Alternatives share the same 15V reverse standoff voltage and DO-214AC (SMA) package but exhibit variations in clamping voltage (25.2V to 27.7V), peak pulse current (14.4A to 71A), or peak pulse power (400W to 4000W). These parts are suitable for applications where the circuit design tolerates higher clamping voltages or where enhanced current handling is beneficial, provided the application does not require the exact 24.4V clamping specification.
Key parameters determining substitution eligibility:
- Reverse standoff voltage: 15V (primary criterion)
- Package type: DO-214AC (SMA) (mechanical compatibility)
- Unidirectional configuration: 1 channel (functional requirement)
- RoHS3 compliance and MSL 1 rating (regulatory and handling requirements)
Parameter Comparison
| Part Number | Manufacturer | Product Status | Standoff Voltage (V) | Breakdown Min (V) | Clamping Max (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Operating Temp (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|
| CD214A-T15ALF | Bourns Inc. | Obsolete | 15 | 16.7 | 24.4 | 16.4 | 400 | -55 to 150 | DO-214AC (SMA) |
| SMAJ15A | EVVO Semi | Active | 15 | 16.7 | 24.4 | 16.4 | 400 | -65 to 150 | DO-214AC (SMA) |
| P4SMA18A-M3/5A | Vishay General Semiconductor - Diodes Division | Active | 15.3 | 17.1 | 25.2 | 15.9 | 400 | -65 to 150 | DO-214AC (SMA) |
| P4SMA18A-M3/61 | Vishay General Semiconductor - Diodes Division | Active | 15.3 | 17.1 | 25.2 | 15.9 | 400 | -65 to 150 | DO-214AC (SMA) |
| P4SMA20A-M3/5A | Vishay General Semiconductor - Diodes Division | Active | 17.1 | 19 | 27.7 | 14.4 | 400 | -65 to 150 | DO-214AC (SMA) |
| P4SMA20A-M3/61 | Vishay General Semiconductor - Diodes Division | Active | 17.1 | 19 | 27.7 | 14.4 | 400 | -65 to 150 | DO-214AC (SMA) |
| SM4T18AY | STMicroelectronics | Active | 15 | 16.7 | 32.5 | 71 (8/20µs) | 400 | -55 to 150 | DO-214AC (SMA) |
| SMA5J18A-M3/5A | Vishay General Semiconductor - Diodes Division | Active | 18 | 20 | 29.2 | 17.1 | 500 | -55 to 150 | DO-214AC (SMA) |
| SMA5J18A-M3/61 | Vishay General Semiconductor - Diodes Division | Active | 18 | 20 | 29.2 | 17.1 | 500 | -55 to 150 | DO-214AC (SMA) |
| SMA6J15A-E3/5A | Vishay General Semiconductor - Diodes Division | Active | 15 | 16.7 | 27.7 | 123 (8/20µs) | 4000 | -55 to 150 | DO-214AC (SMA) |
Engineering Selection Recommendations
Primary Selection: SMAJ15A (EVVO Semi)
The SMAJ15A is the optimal direct equivalent for the CD214A-T15ALF. This part maintains identical electrical specifications (15V standoff, 16.7V breakdown, 24.4V clamping, 16.4A peak pulse current, 400W peak pulse power) and is currently in active production status. The extended operating temperature range (-65°C to 150°C versus -55°C to 150°C) provides additional thermal margin. ROHS3 compliance and MSL 1 rating match the original specification. High inventory availability (85,200 pcs) ensures procurement continuity.
Secondary Selection: SM4T18AY (STMicroelectronics)
The SM4T18AY is suitable for applications where enhanced transient current handling is required. This part maintains the 15V standoff voltage and identical clamping voltage range but provides significantly higher peak pulse current (71A at 8/20µs pulse) within the same 400W peak pulse power envelope. The part carries AEC-Q101 automotive qualification and is actively produced. Operating temperature range matches the original (-55°C to 150°C). Selection of this part is appropriate only when circuit analysis confirms that higher current capacity does not introduce unintended protection characteristics.
Tertiary Selection: SMA6J15A-E3/5A (Vishay General Semiconductor - Diodes Division)
The SMA6J15A-E3/5A maintains the 15V standoff voltage and is suitable for high-energy transient protection applications. This part provides 123A peak pulse current (8/20µs) and 4000W peak pulse power, representing a significant increase in energy dissipation capability. Selection is appropriate only when the application requires protection against high-energy transients and circuit design has been validated for the higher clamping voltage (27.7V).
Not Recommended for Direct Substitution:
Parts with standoff voltages deviating from 15V (P4SMA18A series at 15.3V, P4SMA20A series at 17.1V, SMA5J18A series at 18V) introduce voltage tolerance variations that may compromise circuit protection thresholds. These parts are listed for reference only and should not be selected without explicit circuit redesign and validation.
Frequently Asked Questions (FAQ)
Q: Can SMAJ15A be used as a direct replacement for CD214A-T15ALF without circuit modification?
A: Yes. The SMAJ15A maintains identical electrical specifications across all critical parameters: 15V reverse standoff voltage, 16.7V minimum breakdown voltage, 24.4V maximum clamping voltage, 16.4A peak pulse current, and 400W peak pulse power. The part is pin-compatible in the DO-214AC (SMA) package and requires no circuit modification.
Q: What is the difference between direct equivalents and similar alternatives?
A: Direct equivalents (SMAJ15A) match all electrical specifications of the CD214A-T15ALF. Similar alternatives (SM4T18AY, SMA6J15A-E3/5A) share the same 15V standoff voltage and package but differ in clamping voltage, peak pulse current, or peak pulse power. Similar alternatives are suitable only when circuit analysis confirms tolerance for these parameter variations.
Q: Why are parts with 15.3V or 17.1V standoff voltages not recommended?
A: The CD214A-T15ALF is specified with a 15V reverse standoff voltage. Parts with higher standoff voltages (15.3V, 17.1V, 18V) will not trigger protection at the same voltage threshold, potentially allowing transients to exceed the intended protection level. These parts require explicit circuit redesign and validation.
Q: Does the extended temperature range of SMAJ15A (-65°C to 150°C) affect compatibility?
A: No. The extended lower temperature limit (-65°C versus -55°C) provides additional operational margin and does not compromise compatibility. The upper temperature limit (150°C) remains identical.
Q: What packaging options are available for substitute parts?
A: All substitute parts listed are available in DO-214AC (SMA) surface-mount package, matching the original CD214A-T15ALF package specification. Packaging variants (Cut Tape, Digi-Reel, Tape & Reel) are procurement options and do not affect electrical or mechanical compatibility.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original specification.
Q: When should SM4T18AY or SMA6J15A-E3/5A be selected over SMAJ15A?
A: SM4T18AY should be selected when the application requires higher transient current handling (71A versus 16.4A) within the same 400W power envelope. SMA6J15A-E3/5A should be selected when the application requires high-energy transient protection (4000W versus 400W) with significantly higher peak pulse current (123A). Both selections require circuit validation to confirm that higher current capacity and clamping voltage do not introduce unintended protection behavior.
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