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CD214A-T43ALF Equivalent & Substitute Parts
Part Overview
The CD214A-T43ALF is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc. in DO-214AC (SMA) surface mount package. This component is designed for general-purpose transient voltage suppression with a 43V reverse standoff voltage and 69.4V maximum clamping voltage. 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 | CD214A-T43ALF |
| Manufacturer | Bourns Inc. |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Package / Case | DO-214AC, SMA |
| Voltage - Reverse Standoff (Typ) | 43V |
| Voltage - Breakdown (Min) | 47.8V |
| Voltage - Clamping (Max) @ Ipp | 69.4V |
| Current - Peak Pulse (10/1000µs) | 5.7A |
| Power - Peak Pulse | 400W |
| Operating Temperature Range | -55°C ~ 150°C (TJ) |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the CD214A-T43ALF is determined by the following critical electrical and mechanical parameters:
Primary Substitution Criteria:
- Voltage - Reverse Standoff (Typ): 43V ±tolerance
- Voltage - Clamping (Max) @ Ipp: 69.4V ±tolerance
- Current - Peak Pulse (10/1000µs): 5.7A minimum
- Package / Case: DO-214AC, SMA (mandatory for mechanical compatibility)
- Mounting Type: Surface Mount
- Power - Peak Pulse: 400W
Substitution Categories:
Direct Equivalents maintain all critical electrical parameters within acceptable tolerance and active product status. These parts are pin-compatible and functionally identical for circuit operation.
Similar Substitutes maintain the same package and mounting type but may have variations in voltage clamping, peak pulse current, or operating temperature range. These parts are mechanically compatible but require circuit-level verification of electrical performance.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Operating Temperature | Product Status | Package |
|---|---|---|---|---|---|---|---|
| CD214A-T43ALF | Bourns Inc. | 43V | 69.4V | 5.7A | -55°C ~ 150°C | Obsolete | DO-214AC, SMA |
| SMAJ43A | MDD | 43V | 69.4V | 5.8A | -50°C ~ 150°C | Active | DO-214AC, SMA |
| SZ1SMA43AT3G | Littelfuse Inc. | 43V | 69.4V | 5.8A | -65°C ~ 150°C | Active | DO-214AC, SMA |
| SMAJP4KE51A-TP | Micro Commercial Co | 43.6V | 70.1V | 5.8A | -55°C ~ 175°C | Active | DO-214AC, SMA |
| P4SMA47A-M3/61 | Vishay General Semiconductor - Diodes Division | 40.2V | 64.8V | 6.2A | -65°C ~ 150°C | Active | DO-214AC, SMA |
| SMAJ45A-M3/5A | Vishay General Semiconductor - Diodes Division | 45V | 72.7V | 5.5A | -55°C ~ 150°C | Active | DO-214AC, SMA |
| SMAJ48A | MDD | 48V | 77.4V | 5.2A | -50°C ~ 150°C | Active | DO-214AC, SMA |
| SMAJP4KE56A-TP | Micro Commercial Co | 47.8V | 77V | 5.3A | -55°C ~ 175°C | Active | DO-214AC, SMA |
| SM4T50AY | STMicroelectronics | 43V | 91V | 25A (8/20µs) | -55°C ~ 150°C | Active | DO-214AC, SMA |
| SMAJ43A-TR | STMicroelectronics | 43V | 91V | 25A (8/20µs) | -55°C ~ 150°C | Active | DO-214AC, SMA |
Engineering Selection Recommendations
Preferred Direct Equivalents:
SMAJ43A (MDD) and SZ1SMA43AT3G (Littelfuse Inc.) are the primary recommended substitutes. Both maintain the 43V reverse standoff voltage and 69.4V clamping voltage specifications. SMAJ43A offers active product status with standard operating temperature range. SZ1SMA43AT3G provides extended lower temperature capability (-65°C) and carries AEC-Q101 automotive qualification, making it suitable for applications requiring automotive-grade components.
Alternative Substitutes with Acceptable Variance:
SMAJP4KE51A-TP (Micro Commercial Co) provides a close electrical match with 43.6V standoff and 70.1V clamping voltage, within typical design tolerance. This part offers extended upper operating temperature to 175°C, beneficial for high-temperature applications. RoHS3 compliance and unlimited MSL rating are maintained.
Substitutes Requiring Circuit Verification:
P4SMA47A-M3/61 (Vishay), SMAJ45A-M3/5A (Vishay), and SMAJ48A (MDD) exhibit voltage parameter deviations exceeding typical tolerance bands. These parts are mechanically compatible but require circuit-level analysis to confirm adequate transient suppression performance. P4SMA47A-M3/61 operates at 40.2V standoff with 64.8V clamping; SMAJ45A-M3/5A at 45V standoff with 72.7V clamping; SMAJ48A at 48V standoff with 77.4V clamping.
High-Current Alternatives:
SM4T50AY (STMicroelectronics) and SMAJ43A-TR (STMicroelectronics) maintain 43V standoff voltage but feature significantly higher peak pulse current (25A at 8/20µs pulse) and elevated clamping voltage (91V). These parts are suitable only for applications requiring enhanced transient energy absorption beyond the original specification.
All recommended substitutes maintain DO-214AC (SMA) package compatibility, 400W peak pulse power rating, RoHS3 compliance, and MSL 1 rating.
Frequently Asked Questions (FAQ)
Q: Can SMAJ43A directly replace CD214A-T43ALF?
A: Yes. SMAJ43A maintains identical reverse standoff voltage (43V) and clamping voltage (69.4V) specifications. Peak pulse current is marginally higher (5.8A vs. 5.7A), which is within acceptable tolerance. Both are DO-214AC (SMA) package. The primary difference is product status: SMAJ43A is active while CD214A-T43ALF is obsolete.
Q: What is the difference between direct equivalents and similar substitutes?
A: Direct equivalents maintain all critical electrical parameters (standoff voltage, clamping voltage, peak pulse current) within standard tolerance bands. Similar substitutes may deviate in one or more electrical parameters but remain mechanically compatible. Similar substitutes require circuit-level verification before implementation.
Q: Why do some substitutes have higher clamping voltages?
A: Clamping voltage variation reflects different semiconductor design and manufacturing processes across manufacturers. Higher clamping voltages (such as SM4T50AY at 91V) indicate different transient suppression characteristics. These parts are suitable only if circuit design accommodates the higher voltage threshold.
Q: Is SZ1SMA43AT3G suitable for automotive applications?
A: SZ1SMA43AT3G carries AEC-Q101 automotive qualification and extended lower operating temperature (-65°C). It is suitable for automotive-grade applications. Verify specific automotive qualification requirements with your design standards.
Q: Can I use SMAJ48A as a substitute?
A: SMAJ48A is mechanically compatible (DO-214AC, SMA package) but operates at 48V standoff voltage versus the original 43V specification. This 5V deviation may affect transient suppression performance. Circuit-level analysis is required to confirm adequate protection at the intended operating voltage.
Q: What does MSL 1 (Unlimited) mean?
A: MSL 1 indicates Moisture Sensitivity Level 1, the lowest moisture sensitivity classification. "Unlimited" means the component has no floor life limitation and can be stored indefinitely without special moisture control measures, provided standard storage conditions are maintained.
Q: Are all substitutes RoHS3 compliant?
A: All listed substitutes maintain RoHS3 compliance, consistent with the original CD214A-T43ALF specification. This ensures compatibility with RoHS3-regulated supply chains and end-use applications.
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