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SMBJ28-E3/52 Equivalent & Substitute Parts
Part Overview
The SMBJ28-E3/52 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 28V reverse standoff voltage with a 50V maximum clamping voltage and 12A peak pulse current capability in a DO-214AA (SMB) package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SMBJ28-E3/52 |
| Manufacturer | Vishay General Semiconductor - Diodes Division |
| Category | Transient Voltage Suppressors (TVS) |
| Product Status | Obsolete |
| Type | Zener, Unidirectional |
| Voltage - Reverse Standoff (Typ) | 28V |
| Voltage - Breakdown (Min) | 31.1V |
| Voltage - Clamping (Max) @ Ipp | 50V |
| Current - Peak Pulse (10/1000µs) | 12A |
| Power - Peak Pulse | 600W |
| Operating Temperature Range | -55°C to 150°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | DO-214AA, SMB |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the SMBJ28-E3/52 is determined by the following critical electrical and mechanical parameters:
Primary Substitution Criteria:
- Reverse standoff voltage: 28V (fixed across all substitutes)
- Breakdown voltage minimum: 31.1V (fixed across all substitutes)
- Unidirectional channel configuration: 1 channel
- Package type: DO-214AA / SMB (surface mount)
- Zener diode type
- Power dissipation: 600W peak pulse
- RoHS3 compliance and MSL 1 rating
Acceptable Parameter Variations:
- Clamping voltage (Max @ Ipp): 45.4V to 50V
- Peak pulse current: 12A to 13.8A
- Operating temperature range: -65°C to -50°C minimum; 150°C to 175°C maximum
- Manufacturer and series designation
- Packaging format (Cut Tape, Tape & Reel, or unspecified)
Substitutes are grouped by clamping voltage performance: Group A maintains 50V clamping (matching original specification), while Group B operates at 45.4V clamping with higher peak pulse current capability.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Vwm (Typ) | Vb (Min) | Vc (Max) @ Ipp | Ipp (10/1000µs) | Temp Range (TJ) | Package |
|---|---|---|---|---|---|---|---|---|
| SMBJ28-E3/52 | Vishay | Obsolete | 28V | 31.1V | 50V | 12A | -55°C to 150°C | DO-214AA |
| SMBJ28A-E3/52 | Vishay | Active | 28V | 31.1V | 45.5V | 13.2A | -55°C to 150°C | DO-214AA |
| SMBJ28E3/TR13 | Microchip Technology | Active | 28V | 31.1V | 50V | 12A | -65°C to 150°C | DO-214AA |
| SMBJ28A-HR | Littelfuse Inc. | Active | 28V | 31.1V | 45.4V | 13.3A | -65°C to 150°C | DO-214AA |
| 1SMB28A TR13 PBFREE | Central Semiconductor Corp | Active | 28V | 31.1V | 45.4V | 13.2A | -65°C to 150°C | DO-214AA |
| SMBJ28A | MDD | Active | 28V | 31.1V | 45.4V | 13.3A | -50°C to 150°C | DO-214AA |
| SMBJ28A-13-F | Diodes Incorporated | Active | 28V | 31.1V | 45.4V | 13.2A | -55°C to 150°C | DO-214AA |
| SMBJ28A-TP | Micro Commercial Co | Active | 28V | 31.1V | 45.4V | 13.2A | -55°C to 175°C | DO-214AA |
| SMBJ28A-TR | STMicroelectronics | Active | 28V | 31.1V | 45.4V | 13.8A | -55°C to 150°C | DO-214AA |
Engineering Selection Recommendations
Direct Electrical Equivalent (50V Clamping): SMBJ28E3/TR13 (Microchip Technology) provides identical electrical performance to the original SMBJ28-E3/52 with 50V clamping voltage and 12A peak pulse current. This part is active and RoHS3 compliant with extended temperature range (-65°C to 150°C), making it the primary replacement for applications requiring exact clamping voltage specification.
Active Substitute Group (45.4V Clamping, Enhanced Current): SMBJ28A-E3/52 (Vishay), SMBJ28A-HR (Littelfuse), 1SMB28A TR13 PBFREE (Central Semiconductor), SMBJ28A (MDD), SMBJ28A-13-F (Diodes Incorporated), SMBJ28A-TP (Micro Commercial Co), and SMBJ28A-TR (STMicroelectronics) are all active products with 45.4V to 45.5V clamping voltage and 13.2A to 13.8A peak pulse current. These parts are suitable for applications where the lower clamping voltage and higher current capability are compatible with circuit requirements. All are RoHS3 compliant with MSL 1 rating.
Temperature Consideration: SMBJ28A-TP (Micro Commercial Co) offers the widest operating temperature range (-55°C to 175°C), providing additional thermal margin for high-temperature applications. SMBJ28E3/TR13 and SMBJ28A-HR extend the minimum temperature to -65°C for cold-environment applications.
Compliance and Availability: All substitute parts maintain RoHS3 compliance and MSL 1 moisture sensitivity rating. Selection should prioritize active product status and availability requirements specific to procurement timelines.
Frequently Asked Questions (FAQ)
Q: Can SMBJ28A-E3/52 directly replace SMBJ28-E3/52? A: SMBJ28A-E3/52 is electrically compatible as a substitute. Both maintain 28V reverse standoff voltage, 31.1V minimum breakdown voltage, and identical DO-214AA packaging. The primary difference is clamping voltage: SMBJ28A-E3/52 clamps at 45.5V versus the original 50V. This substitution is valid for applications where the lower clamping voltage does not exceed circuit protection requirements.
Q: What is the difference between 50V and 45.4V clamping voltage specifications? A: Clamping voltage is the maximum voltage across the TVS diode when conducting peak pulse current. The original SMBJ28-E3/52 clamps at 50V, while most active substitutes clamp at 45.4V to 45.5V. Lower clamping voltage provides tighter voltage regulation but may require circuit verification to ensure protected components remain within safe operating limits.
Q: Are all substitute parts available in the same DO-214AA package? A: Yes. All listed substitute parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical and footprint compatibility. Packaging format variations (Cut Tape, Tape & Reel) affect procurement and handling but do not impact electrical or mechanical fit.
Q: Which substitute offers the best temperature range coverage? A: SMBJ28A-TP (Micro Commercial Co) provides the widest operating range at -55°C to 175°C. For extended cold-temperature operation, SMBJ28E3/TR13 and SMBJ28A-HR both extend to -65°C minimum. Standard substitutes operate from -55°C to -50°C minimum.
Q: Is RoHS3 compliance maintained across all substitutes? A: Yes. All substitute parts listed are RoHS3 compliant with MSL 1 (unlimited moisture sensitivity level), matching the original part's environmental and regulatory status.
Q: What is the significance of peak pulse current variation (12A to 13.8A)? A: Peak pulse current indicates the maximum transient current the TVS diode can safely conduct during a 10/1000µs pulse. Higher current capability (13.2A to 13.8A in substitutes) provides additional margin for transient suppression without degradation. This variation is within acceptable substitution parameters for the SMBJ28 series.
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