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SMP12A-E3/85A Equivalent & Substitute Parts
Part Overview
The SMP12A-E3/85A is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® and eSMP® series. This component is designed for general-purpose transient voltage suppression applications with a 12V reverse standoff voltage and 19.9V maximum clamping voltage. The part is currently classified as obsolete, making identification of active equivalent alternatives essential for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SMP12A-E3/85A |
| Manufacturer | Vishay General Semiconductor - Diodes Division |
| Category | Transient Voltage Suppressors (TVS) |
| Series | TransZorb®, eSMP® |
| Type | Zener |
| Unidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 12V |
| Voltage - Breakdown (Min) | 13.3V |
| Voltage - Clamping (Max) @ Ipp | 19.9V |
| Current - Peak Pulse (10/1000µs) | 20.1A |
| Power - Peak Pulse | 400W |
| Operating Temperature | -55°C ~ 150°C (TJ) |
| Package / Case | DO-220AA |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the SMP12A-E3/85A is determined by strict equivalence across the following critical parameters:
- Unidirectional Channels: 1
- Voltage - Reverse Standoff (Typ): 12V
- Voltage - Breakdown (Min): 13.3V
- Voltage - Clamping (Max) @ Ipp: 19.9V
- Current - Peak Pulse (10/1000µs): 20.1A
- Power - Peak Pulse: 400W
- Package / Case: DO-220AA
- Mounting Type: Surface Mount
- Operating Temperature Range: -55°C ~ 150°C (TJ)
The identified substitute parts maintain identical electrical specifications and mechanical compatibility. Differences exist only in product status (active vs. obsolete) and packaging configuration (Tape & Reel vs. original packaging).
Parameter Comparison
| Parameter | SMP12A-E3/85A (Main) | SMP12A-M3/84A | SMP12A-M3/85A |
|---|---|---|---|
| Manufacturer | Vishay General Semiconductor - Diodes Division | Vishay General Semiconductor - Diodes Division | Vishay General Semiconductor - Diodes Division |
| Product Status | Obsolete | Active | Active |
| Type | Zener | Zener | Zener |
| Unidirectional Channels | 1 | 1 | 1 |
| Voltage - Reverse Standoff (Typ) | 12V | 12V | 12V |
| Voltage - Breakdown (Min) | 13.3V | 13.3V | 13.3V |
| Voltage - Clamping (Max) @ Ipp | 19.9V | 19.9V | 19.9V |
| Current - Peak Pulse (10/1000µs) | 20.1A | 20.1A | 20.1A |
| Power - Peak Pulse | 400W | 400W | 400W |
| Operating Temperature | -55°C ~ 150°C (TJ) | -55°C ~ 150°C (TJ) | -55°C ~ 150°C (TJ) |
| Package / Case | DO-220AA | DO-220AA | DO-220AA |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount |
| Packaging Configuration | Standard | Tape & Reel (TR) | Tape & Reel (TR) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Both SMP12A-M3/84A and SMP12A-M3/85A are direct functional equivalents to the obsolete SMP12A-E3/85A. Selection between these active alternatives should be based on:
Product Status: Both substitute parts carry Active product status, ensuring long-term availability and manufacturing support compared to the obsolete main part.
Compliance & Certifications: All three parts maintain identical ROHS3 compliance and REACH unaffected status, confirming regulatory equivalence for new designs and procurement.
Packaging Consideration: The substitute parts are supplied in Tape & Reel (TR) configuration, which is standard for high-volume surface mount assembly. Original packaging configuration of the main part differs only in delivery format, not in component performance or mechanical fit.
Inventory Availability: SMP12A-M3/85A offers significantly higher stock levels (12,200 pcs) compared to SMP12A-M3/84A (3,425 pcs), supporting procurement continuity for ongoing production requirements.
Frequently Asked Questions (FAQ)
Q: Can SMP12A-M3/84A and SMP12A-M3/85A be used interchangeably with SMP12A-E3/85A?
A: Yes. Both substitute parts maintain identical electrical specifications (12V standoff, 19.9V clamping, 20.1A peak pulse current, 400W peak power) and mechanical compatibility (DO-220AA package, surface mount). The only differences are product status (active vs. obsolete) and packaging format (Tape & Reel).
Q: What is the significance of the different part number suffixes (E3 vs. M3)?
A: The suffix designates the packaging configuration and manufacturing variant. E3 represents the obsolete original packaging, while M3 indicates the active Tape & Reel variant. Electrical and mechanical specifications remain identical across these designations.
Q: Are there any thermal or performance differences between the substitute parts?
A: No. All three parts share identical operating temperature range (-55°C ~ 150°C TJ), peak pulse power (400W), and electrical characteristics. Thermal performance and transient suppression capability are equivalent.
Q: Does the Tape & Reel packaging affect component performance?
A: No. Tape & Reel packaging is a delivery and handling format for automated assembly. It does not alter the electrical performance, reliability, or mechanical fit of the DO-220AA surface mount component.
Q: Are all substitute parts RoHS and REACH compliant?
A: Yes. SMP12A-M3/84A and SMP12A-M3/85A both maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the main part.
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