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SMBJ24A-M3/5B Equivalent & Substitute Parts
Part Overview
The SMBJ24A-M3/5B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This surface-mount component operates in the DO-214AA (SMB) package and is designed for general-purpose transient voltage suppression applications. The part is Active status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical performance parameters: 24V reverse standoff voltage, 26.7V minimum breakdown voltage, 38.9V maximum clamping voltage at peak pulse current, 15.4A peak pulse current (10/1000µs), and 600W peak pulse power rating.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 24 | V |
| Voltage - Breakdown (Min) | 26.7 | V |
| Voltage - Clamping (Max) @ Ipp | 38.9 | V |
| Current - Peak Pulse (10/1000µs) | 15.4 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AA, SMB | - |
| Mounting Type | Surface Mount | - |
| Type | Zener | - |
| Unidirectional Channels | 1 | - |
| RoHS Status | ROHS3 Compliant | - |
| MSL Rating | 1 (Unlimited) | - |
Substitute Part Grouping Explanation
Substitute parts for the SMBJ24A-M3/5B are classified into two categories based on electrical parameter matching:
Category 1: Direct Electrical Equivalents These parts maintain identical or near-identical electrical specifications across all critical parameters: 24V reverse standoff voltage, 26.7V minimum breakdown voltage, 38.9V maximum clamping voltage, 15.4A peak pulse current, and 600W peak pulse power. Packaging may differ (Tape & Reel vs. Cut Tape), and minor variations in operating temperature range are permitted. These parts are fully interchangeable in circuit design.
Category 2: Functional Equivalents with Minor Parameter Variance The SMBJ24D-M3/I exhibits slight variations in clamping voltage (38.4V vs. 38.9V) and peak pulse current (15.6A vs. 15.4A), remaining within acceptable tolerance for general-purpose transient suppression applications while maintaining the same 24V standoff and 600W power rating.
Non-Equivalent Part (Reference Only) The SMBJ20A is listed as manufacturer-recommended but operates at a different voltage class (20V standoff vs. 24V standoff) with different clamping characteristics (32.4V vs. 38.9V). This part is not a substitute and is included for reference only.
Parameter Comparison
| Part Number | Manufacturer | Standoff Voltage (V) | Breakdown Min (V) | Clamp Max @ Ipp (V) | Peak Pulse Current (A) | Peak Power (W) | Temp Range (°C) | Package | Packaging Type |
|---|---|---|---|---|---|---|---|---|---|
| SMBJ24A-M3/5B | Vishay | 24 | 26.7 | 38.9 | 15.4 | 600 | -55 to 150 | DO-214AA, SMB | Tape & Reel (TR) |
| SMBJ24A-E3/52 | Vishay | 24 | 26.7 | 38.9 | 15.4 | 600 | -55 to 150 | DO-214AA, SMB | Cut Tape (CT) |
| SMBJ24A-E3/5B | Vishay | 24 | 26.7 | 38.9 | 15.4 | 600 | -55 to 150 | DO-214AA, SMB | Tape & Reel (TR) |
| SMBJ24D-M3/I | Vishay | 24 | 27.1 | 38.4 | 15.6 | 600 | -55 to 150 | DO-214AA, SMB | Tape & Reel (TR) |
| 1SMB24A TR13 PBFREE | Central Semiconductor | 24 | 26.7 | 38.9 | 15.4 | 600 | -65 to 150 | DO-214AA, SMB | Tape & Reel (TR) |
| SMBJ24A | MDD | 24 | 26.7 | 38.9 | 15.5 | 600 | -50 to 150 | DO-214AA, SMB | - |
| SMBJ24A-13-F | Diodes Incorporated | 24 | 26.7 | 38.9 | 15.4 | 600 | -55 to 150 | DO-214AA, SMB | Tape & Reel (TR) |
| SMBJ24A-TP | Micro Commercial Co | 24 | 26.7 | 38.9 | 15.4 | 600 | -55 to 175 | DO-214AA, SMB | Tape & Reel (TR) |
Engineering Selection Recommendations
Primary Substitutes (Full Electrical Equivalence)
SMBJ24A-E3/5B (Vishay) and SMBJ24A-13-F (Diodes Incorporated) are direct substitutes with identical electrical parameters to the SMBJ24A-M3/5B. Both maintain 24V standoff voltage, 26.7V breakdown minimum, 38.9V clamping maximum, 15.4A peak pulse current, and -55°C to 150°C operating range. Both are RoHS3 compliant with MSL 1 rating. Selection between these and the original part depends on packaging availability (Tape & Reel) and supplier inventory.
SMBJ24A-E3/52 (Vishay) provides identical electrical performance but is supplied in Cut Tape packaging rather than Tape & Reel. This substitution is valid for applications where cut tape format is acceptable for assembly processes.
Extended Temperature Substitute
SMBJ24A-TP (Micro Commercial Co) matches all electrical parameters of the SMBJ24A-M3/5B and extends the upper operating temperature limit to 175°C (versus 150°C). This part is suitable for applications requiring enhanced thermal performance while maintaining identical transient suppression characteristics.
Lower Temperature Limit Substitute
1SMB24A TR13 PBFREE (Central Semiconductor) provides identical electrical performance with an extended lower operating temperature of -65°C (versus -55°C). This part is appropriate for applications requiring operation in colder environments.
Functional Equivalent with Minor Variance
SMBJ24D-M3/I (Vishay) exhibits clamping voltage of 38.4V (0.5V lower than 38.9V) and peak pulse current of 15.6A (0.2A higher than 15.4A). These variations remain within typical design tolerances for general-purpose transient suppression. This part is functionally equivalent for applications where the specified parameter ranges are not critical.
Alternative Manufacturer Options
SMBJ24A (MDD) provides electrical equivalence with peak pulse current of 15.5A and operating range of -50°C to 150°C. This part is suitable where the narrower lower temperature limit is acceptable.
All recommended substitutes maintain RoHS3 compliance, MSL 1 rating, and DO-214AA (SMB) package compatibility with surface-mount assembly processes.
Frequently Asked Questions (FAQ)
Q: Can SMBJ24A-E3/52 replace SMBJ24A-M3/5B in production assembly?
A: Yes. SMBJ24A-E3/52 is electrically identical to SMBJ24A-M3/5B. The only difference is packaging format: Cut Tape (CT) versus Tape & Reel (TR). Compatibility depends on your assembly equipment's tape format capability. Both parts are Vishay TransZorb® series with identical electrical specifications.
Q: What is the difference between SMBJ24A-M3/5B and SMBJ24D-M3/I?
A: Both parts maintain 24V standoff voltage and 600W peak power. SMBJ24D-M3/I has slightly lower clamping voltage (38.4V vs. 38.9V) and slightly higher peak pulse current (15.6A vs. 15.4A). These differences are minor and both parts function as 24V transient suppressors. Selection depends on whether your circuit design requires the specific clamping voltage of 38.9V.
Q: Is SMBJ24A-TP suitable for high-temperature applications?
A: SMBJ24A-TP extends the upper operating temperature to 175°C compared to 150°C for SMBJ24A-M3/5B. All other electrical parameters are identical. Use SMBJ24A-TP when your application requires operation above 150°C junction temperature.
Q: Can I use 1SMB24A TR13 PBFREE in place of SMBJ24A-M3/5B?
A: Yes. 1SMB24A TR13 PBFREE (Central Semiconductor) is electrically equivalent with identical 24V standoff, 26.7V breakdown, 38.9V clamping, and 15.4A peak current. The extended lower temperature range (-65°C vs. -55°C) provides additional capability for cold-environment applications.
Q: Why is SMBJ20A listed but not recommended as a substitute?
A: SMBJ20A operates at 20V standoff voltage with 32.4V clamping voltage, fundamentally different from the 24V/38.9V specifications of SMBJ24A-M3/5B. This part is not a substitute and is included for reference only. Use SMBJ20A only if your circuit design specifically requires 20V protection.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory status of SMBJ24A-M3/5B.
Q: What packaging formats are available for 24V TVS diode substitutes?
A: Substitute parts are available in Tape & Reel (TR) and Cut Tape (CT) formats. All maintain DO-214AA (SMB) package geometry for surface-mount assembly. Verify your assembly equipment compatibility with the specific tape format before selection.
Q: Can SMBJ24A (MDD) replace SMBJ24A-M3/5B?
A: Yes, with one consideration. SMBJ24A (MDD) is electrically equivalent with 15.5A peak pulse current and identical 24V standoff and 38.9V clamping. The operating temperature range is -50°C to 150°C (versus -55°C to 150°C). This part is suitable if your application does not require operation below -50°C.
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