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CD214A-T70CALF Equivalent & Substitute Parts
Part Overview
The CD214A-T70CALF 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 70V reverse standoff voltage with 113V maximum clamping voltage and 4.6A peak pulse current capability in a DO-214AC (SMA) package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | CD214A-T70CALF |
| Manufacturer | Bourns Inc. |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Voltage - Reverse Standoff (Typ) | 70V |
| Voltage - Breakdown (Min) | 77.8V |
| Voltage - Clamping (Max) @ Ipp | 113V |
| Current - Peak Pulse (10/1000µs) | 4.6A |
| Power - Peak Pulse | 400W |
| Package / Case | DO-214AC, SMA |
| Mounting Type | Surface Mount |
| Operating Temperature | -55°C ~ 150°C (TJ) |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the CD214A-T70CALF is determined by the following critical parameters:
Primary Matching Criteria:
- Voltage - Reverse Standoff (Typ): 70V
- Voltage - Clamping (Max) @ Ipp: 113V (±tolerance acceptable)
- Current - Peak Pulse (10/1000µs): 4.6A (minimum)
- Package / Case: DO-214AC, SMA
- Mounting Type: Surface Mount
- Type: Zener, Bidirectional
Substitute Categories:
Direct Equivalents maintain identical electrical performance within the specified parameters. These parts are pin-compatible and functionally interchangeable without circuit modification.
Similar Substitutes share the same reverse standoff voltage (70V) and package format but differ in clamping voltage and/or peak pulse current. These parts are suitable when the application can tolerate higher clamping voltages or increased current handling capability.
Parameter Comparison
| Part Number | Manufacturer | VWM (Typ) | Vc (Max) @ Ipp | Ipp | Power | Temp Range | Status | Package |
|---|---|---|---|---|---|---|---|---|
| CD214A-T70CALF | Bourns Inc. | 70V | 113V | 4.6A | 400W | -55°C ~ 150°C | Obsolete | DO-214AC (SMA) |
| SMAJ70CA | MDD | 70V | 113V | 4.6A | 400W | -50°C ~ 150°C | Active | DO-214AC (SMA) |
| SMAJ70CA-TP | Micro Commercial Co | 70V | 113V | 4.6A | 400W | -55°C ~ 175°C | Active | DO-214AC (SMA) |
| SM4T82CAY | STMicroelectronics | 70V | 146V | 16A (8/20µs) | 400W | -55°C ~ 150°C | Active | DO-214AC (SMA) |
| SMA6J70CA-TR | STMicroelectronics | 70V | 120V | 27A (8/20µs) | 600W | -55°C ~ 175°C | Active | DO-214AC (SMA) |
| SMAJ70CA-TR | STMicroelectronics | 70V | 146V | 16A (8/20µs) | 400W | -55°C ~ 150°C | Active | DO-214AC (SMA) |
| SMAJ75CA-M3/5A | Vishay General Semiconductor | 75V | 121V | 3.3A | 400W | -55°C ~ 150°C | Active | DO-214AC (SMA) |
Engineering Selection Recommendations
For Direct Replacement (Identical Electrical Performance):
SMAJ70CA-TP (Micro Commercial Co) is the primary recommended substitute. This part maintains all critical electrical parameters of the CD214A-T70CALF while offering an extended operating temperature range (-55°C ~ 175°C) and active product status. ROHS3 compliance and MSL 1 rating ensure compatibility with current manufacturing processes.
SMAJ70CA (MDD) provides an alternative direct equivalent with identical electrical specifications. The slightly narrower lower temperature limit (-50°C vs -55°C) should be evaluated against specific application requirements.
For Enhanced Performance Applications:
SM4T82CAY (STMicroelectronics) and SMAJ70CA-TR (STMicroelectronics) maintain the 70V reverse standoff voltage while providing higher clamping voltages (146V) and increased peak pulse current (16A). These parts are suitable for applications requiring greater transient energy absorption. Both carry AEC-Q101 automotive qualification (SM4T82CAY) and active product status.
SMA6J70CA-TR (STMicroelectronics) offers the highest performance option with 27A peak pulse current capability and 600W power dissipation, suitable for high-energy transient protection circuits. Extended temperature range to 175°C provides additional design margin.
For Voltage-Shifted Applications:
SMAJ75CA-M3/5A (Vishay General Semiconductor) provides a 75V reverse standoff variant with comparable clamping voltage (121V) and peak pulse current (3.3A). This part is suitable only when the application circuit can accommodate the 5V higher standoff voltage.
All recommended substitutes maintain DO-214AC (SMA) package compatibility, surface-mount configuration, and ROHS3 compliance.
Frequently Asked Questions (FAQ)
Q: Can SMAJ70CA-TP be used as a direct drop-in replacement for CD214A-T70CALF?
A: Yes. SMAJ70CA-TP maintains identical reverse standoff voltage (70V), clamping voltage (113V), and peak pulse current (4.6A) specifications. The DO-214AC (SMA) package is mechanically and electrically compatible. The extended temperature range (-55°C ~ 175°C) provides additional operational margin.
Q: What is the difference between the direct equivalents and similar substitutes?
A: Direct equivalents (SMAJ70CA, SMAJ70CA-TP) match all critical electrical parameters of the original part. Similar substitutes maintain the 70V reverse standoff voltage but offer different clamping voltages and peak pulse currents. Selection depends on whether your circuit requires identical performance or can benefit from enhanced transient suppression capability.
Q: Why do some substitutes have higher clamping voltages (146V vs 113V)?
A: Higher clamping voltage indicates the part will clamp transients at a higher voltage level. This is determined by the internal diode design and is a fundamental characteristic of each part number. Selection should be based on the maximum allowable voltage your protected circuit can tolerate during a transient event.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts carry ROHS3 compliance certification, ensuring compatibility with current manufacturing and environmental regulations.
Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?
A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed parts carry this rating, eliminating moisture-related reliability concerns.
Q: Can I use SMAJ75CA-M3/5A as a substitute?
A: SMAJ75CA-M3/5A has a 75V reverse standoff voltage compared to the original 70V specification. This 5V difference means the part will not begin suppressing transients until a higher voltage is reached. Use only if your circuit design specifically accommodates this higher threshold.
Q: Which substitute offers the best performance for high-energy transient environments?
A: SMA6J70CA-TR provides the highest energy absorption capability with 27A peak pulse current and 600W power dissipation, while maintaining the 70V reverse standoff voltage. This part is suitable for circuits experiencing severe transient conditions.
Q: Are there packaging differences between the substitutes?
A: All listed substitutes use the DO-214AC (SMA) surface-mount package. Packaging format is identical across all parts, ensuring PCB layout compatibility without modification.
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