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1SMC22AT3 Transient Voltage Suppressor (TVS) Diode – Equivalent & Substitute Parts
Part Overview
The 1SMC22AT3 is a unidirectional transient voltage suppressor diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 22V reverse standoff voltage with a 35.5V maximum clamping voltage and 42.2A peak pulse current capability in a DO-214AB (SMC) package. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 22 | V |
| Voltage - Breakdown (Min) | 24.4 | V |
| Voltage - Clamping (Max) @ Ipp | 35.5 | V |
| Current - Peak Pulse (10/1000µs) | 42.2 | A |
| Power - Peak Pulse | 1500 | W |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| Package / Case | DO-214AB, SMC | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Applications | General Purpose | — |
Substitute Part Grouping Explanation
Substitution eligibility for the 1SMC22AT3 is determined by the following critical parameters:
- Voltage Rating: Reverse standoff voltage of 22V and breakdown voltage minimum of 24.4V
- Clamping Voltage: Maximum clamping voltage at Ipp of 35.5V
- Package: DO-214AB (SMC) surface-mount form factor
- Diode Type: Unidirectional zener configuration with single channel
- Peak Pulse Current: Minimum 42.2A capability at 10/1000µs pulse profile
- Power Dissipation: Minimum 1500W peak pulse power rating
Substitute parts must maintain electrical equivalence across all these parameters while meeting or exceeding the performance specifications of the original component. Parts with higher power ratings, improved temperature ranges, or active product status are acceptable alternatives.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Clamping (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| 1SMC22AT3 | onsemi | 22 | 35.5 | 42.2 | 1500 | -65 to 150 | DO-214AB, SMC | Obsolete | Non-compliant |
| SMCJ22A-TR | STMicroelectronics | 22 | 48.3 | 207 (8/20µs) | 1500 | -55 to 150 | DO-214AB, SMC | Active | ROHS3 Compliant |
| 3.0SMCJ22A-13 | Diodes Incorporated | 22 | 35.5 | 84.5 | 3000 | -55 to 175 | DO-214AB, SMC | Discontinued | ROHS3 Compliant |
| 5.0SMDJ22A | Taiwan Semiconductor Corporation | 22 | 35.5 | 141 | 5000 | -55 to 175 | DO-214AB, SMC | Active | ROHS3 Compliant |
| 5.0SMDJ22A-T7 | Littelfuse Inc. | 22 | 35.5 | 141 | 5000 | -65 to 150 | DO-214AB, SMC | Active | ROHS3 Compliant |
| SMCJ22A | Fairchild Semiconductor | 22 | 35.5 | 42.3 | 1500 | -55 to 150 | DO-214AB, SMC | Active | — |
| SMCJ22A-13-F | Diodes Incorporated | 22 | 35.5 | 42.2 | 1500 | -55 to 150 | DO-214AB, SMC | Active | ROHS3 Compliant |
| SMCJ22A-HR | Littelfuse Inc. | 22 | 35.5 | 42.3 | 1500 | -65 to 150 | DO-214AB, SMC | Active | ROHS3 Compliant |
| SMCJ22A-HRA | Littelfuse Inc. | 22 | 35.5 | 42.3 | 1500 | -65 to 150 | DO-214AB, SMC | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Electrical Equivalents (Identical Specifications)
SMCJ22A-13-F (Diodes Incorporated), SMCJ22A-HR (Littelfuse Inc.), and SMCJ22A-HRA (Littelfuse Inc.) provide direct electrical equivalence to the 1SMC22AT3 with matching voltage ratings, clamping voltages, and peak pulse current specifications. All three are active products with ROHS3 compliance, making them suitable for new designs and production environments requiring regulatory compliance.
Enhanced Performance Alternatives
5.0SMDJ22A (Taiwan Semiconductor Corporation) and 5.0SMDJ22A-T7 (Littelfuse Inc.) maintain identical voltage and clamping specifications while offering significantly higher peak pulse current (141A) and power dissipation (5000W). These parts are active products with ROHS3 compliance and extended temperature ranges, providing additional design margin for high-energy transient protection applications.
3.0SMCJ22A-13 (Diodes Incorporated) offers doubled power dissipation (3000W) with higher peak pulse current (84.5A) while maintaining clamping voltage equivalence. Although discontinued at DiGi Electronics, this part remains available through alternative channels and carries ROHS3 compliance.
Higher Clamping Voltage Alternative
SMCJ22A-TR (STMicroelectronics) maintains the 22V reverse standoff voltage but features elevated clamping voltage (48.3V) and significantly higher peak pulse current (207A at 8/20µs pulse profile). This part is active with ROHS3 compliance and is suitable for applications requiring higher transient energy absorption with different pulse characteristics.
Standard Equivalent
SMCJ22A (Fairchild Semiconductor) provides electrical equivalence with matching voltage, clamping, and power specifications. This part is active and available in bulk packaging.
Frequently Asked Questions (FAQ)
Q: Can SMCJ22A-TR be used as a direct replacement for 1SMC22AT3?
A: SMCJ22A-TR maintains the 22V reverse standoff voltage and 1500W power rating but features higher clamping voltage (48.3V versus 35.5V) and significantly higher peak pulse current (207A at 8/20µs). This part is electrically compatible for general-purpose overvoltage protection but will clamp at a higher voltage level. Selection depends on circuit tolerance for clamping voltage variation.
Q: What is the difference between 5.0SMDJ22A and 5.0SMDJ22A-T7?
A: Both parts share identical electrical specifications (22V standoff, 35.5V clamping, 141A peak pulse, 5000W power). The primary difference is operating temperature range: 5.0SMDJ22A operates -55 to 175°C while 5.0SMDJ22A-T7 operates -65 to 150°C. Selection depends on application temperature requirements.
Q: Are all substitute parts available in the same package as 1SMC22AT3?
A: All listed substitute parts use DO-214AB (SMC) surface-mount packaging, maintaining mechanical and electrical compatibility with the original component footprint. Packaging variations exist only in tape-and-reel versus bulk configurations, which do not affect circuit performance.
Q: Which substitute offers the best compliance for new designs?
A: SMCJ22A-13-F, SMCJ22A-HR, SMCJ22A-HRA, 5.0SMDJ22A, and 5.0SMDJ22A-T7 all carry ROHS3 compliance and active product status, making them suitable for new designs subject to regulatory requirements. The original 1SMC22AT3 is RoHS non-compliant and obsolete.
Q: Can higher power-rated parts like 5.0SMDJ22A be used in place of 1SMC22AT3?
A: Yes. Higher power-rated parts (5000W versus 1500W) with equivalent voltage specifications provide enhanced transient protection capability. The increased power dissipation rating does not degrade circuit performance and offers additional design margin for high-energy transient events.
Q: What pulse profile differences exist between substitute parts?
A: Most parts are specified at 10/1000µs pulse profile matching the original 1SMC22AT3. SMCJ22A-TR uses an 8/20µs pulse profile, which represents a different transient waveform. Selection should align with the actual transient pulse characteristics present in the application circuit.
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