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CD214B-T40CALF Equivalent & Substitute Parts
Part Overview
The CD214B-T40CALF 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 40V reverse standoff voltage and provides 64.5V clamping at peak pulse current. The component is packaged in DO-214AA (SMB) format with a peak pulse power rating of 600W.
The CD214B-T40CALF is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 40 | V |
| Voltage - Breakdown (Min) | 44.4 | V |
| Voltage - Clamping (Max) @ Ipp | 64.5 | V |
| Current - Peak Pulse (10/1000µs) | 9.3 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AA, SMB | — |
| Bidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the CD214B-T40CALF is determined by the following critical parameters:
- Voltage - Reverse Standoff (Typ): 40V
- Voltage - Clamping (Max) @ Ipp: 64.5V
- Current - Peak Pulse (10/1000µs): 9.3A
- Power - Peak Pulse: 600W
- Package / Case: DO-214AA, SMB
- Bidirectional Channels: 1
Substitute parts are grouped into two categories:
Direct Equivalents: Parts with identical electrical specifications (40V standoff, 64.5V clamping, 9.3A peak pulse current) and the same SMB package. These parts are interchangeable without circuit redesign.
Similar Parts: Parts with the same package and general voltage class but with variations in clamping voltage or peak pulse current. These require engineering evaluation for specific application requirements.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Clamping (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Product Status | Package |
|---|---|---|---|---|---|---|---|---|
| CD214B-T40CALF | Bourns Inc. | 40 | 64.5 | 9.3 | 600 | -55 to 150 | Obsolete | DO-214AA, SMB |
| SMBJ40CA | MDD | 40 | 64.5 | 9.3 | 600 | -50 to 150 | Active | DO-214AA, SMB |
| SMBJ40CA-HR | Littelfuse Inc. | 40 | 64.5 | 9.3 | 600 | -65 to 150 | Active | DO-214AA, SMB |
| SMBJ40CA-TP | Micro Commercial Co | 40 | 64.5 | 9.3 | 600 | -55 to 175 | Active | DO-214AA, SMB |
| SMBJ40CA-TR | STMicroelectronics | 40 | 64.5 | 9.7 | 600 | -55 to 150 | Active | DO-214AA, SMB |
| SM6T47CAY | STMicroelectronics | 40 | 84 | 48 (8/20µs) | 600 | -55 to 150 | Active | DO-214AA, SMB |
| SMBJ43CA | MDD | 43 | 69.4 | 8.7 | 600 | -50 to 150 | Active | DO-214AA, SMB |
| SMBJ43CA-TP | Micro Commercial Co | 43 | 69.4 | 8.6 | 600 | -55 to 175 | Active | DO-214AA, SMB |
Engineering Selection Recommendations
Direct Replacement (Preferred)
SMBJ40CA-TP (Micro Commercial Co) and SMBJ40CA-TR (STMicroelectronics) are the primary direct replacements for CD214B-T40CALF. Both maintain identical voltage specifications (40V standoff, 64.5V clamping) and current ratings (9.3A peak pulse). Both manufacturers are active suppliers with established product status and ROHS3 compliance. SMBJ40CA-TP offers extended operating temperature range (-55 to 175°C), providing additional thermal margin for demanding applications.
SMBJ40CA-HR (Littelfuse Inc.) is an alternative direct equivalent with identical electrical specifications and extended lower temperature rating (-65°C minimum), suitable for applications requiring enhanced cold-temperature performance.
Secondary Alternatives
SMBJ40CA (MDD) provides electrical equivalence but operates within a narrower temperature range (-50 to 150°C). This part is suitable for applications within standard industrial temperature limits.
SMBJ43CA and SMBJ43CA-TP represent voltage-class alternatives with 43V standoff and 69.4V clamping. These parts are suitable only where the higher clamping voltage is acceptable and the application does not require the specific 40V/64.5V characteristics of the original design.
SM6T47CAY (STMicroelectronics) operates at 40V standoff but clamps at 84V with significantly higher peak pulse current (48A at 8/20µs). This part is suitable only for applications where higher clamping voltage and current capacity are required.
All recommended substitutes maintain DO-214AA (SMB) packaging, ROHS3 compliance, and MSL 1 rating, ensuring compatibility with existing PCB designs and manufacturing processes.
Frequently Asked Questions (FAQ)
Q: Can SMBJ40CA-TP directly replace CD214B-T40CALF without circuit modification?
A: Yes. SMBJ40CA-TP maintains identical voltage specifications (40V standoff, 64.5V clamping) and peak pulse current (9.3A). The DO-214AA package is mechanically and electrically compatible. No circuit redesign is required.
Q: What is the difference between SMBJ40CA-TP and SMBJ40CA-TR?
A: Both parts are direct electrical equivalents with 40V standoff and 64.5V clamping. SMBJ40CA-TP (Micro Commercial Co) operates from -55 to 175°C, while SMBJ40CA-TR (STMicroelectronics) operates from -55 to 150°C. SMBJ40CA-TP provides extended high-temperature capability.
Q: Why is SM6T47CAY listed as a substitute if it has different clamping voltage?
A: SM6T47CAY maintains the 40V reverse standoff voltage but clamps at 84V with 48A peak pulse current. It is listed as a similar part for applications where higher transient energy absorption and clamping voltage are acceptable design parameters. Direct substitution requires circuit analysis.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 rating, consistent with the original CD214B-T40CALF specifications.
Q: What is the significance of the different peak pulse current specifications (9.3A vs. 9.7A)?
A: SMBJ40CA-TR specifies 9.7A peak pulse current compared to 9.3A for the original part. This represents a 4.3% increase in current handling capability at the same clamping voltage. For most applications, this variation is within acceptable tolerance and does not affect substitution suitability.
Q: Can SMBJ43CA replace CD214B-T40CALF?
A: SMBJ43CA is not a direct replacement. It operates at 43V standoff (vs. 40V) and clamps at 69.4V (vs. 64.5V). Substitution is possible only if the application circuit can tolerate the higher voltage thresholds. Engineering evaluation of the specific circuit is required.
Q: What packaging options are available for substitute parts?
A: All substitute parts are available in DO-214AA (SMB) surface mount package, matching the original CD214B-T40CALF. Packaging variants (Cut Tape, Tape & Reel, Digi-Reel) differ only in supply format and do not affect electrical or mechanical compatibility.
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