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SA36ARLG Equivalent & Substitute Parts
Part Overview
The SA36ARLG is a 36V Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 58.1V clamping voltage and 8.6A peak pulse current in a DO-204AC (DO-15) axial through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of -55°C to 150°C and is ROHS3 compliant with unlimited moisture sensitivity rating.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Reverse Standoff (Typ) | 36V |
| Voltage - Breakdown (Min) | 40V |
| Voltage - Clamping (Max) @ Ipp | 58.1V |
| Current - Peak Pulse (10/1000µs) | 8.6A |
| Power - Peak Pulse | 500W |
| Operating Temperature Range | -55°C ~ 150°C (TJ) |
| Mounting Type | Through Hole |
| Package / Case | DO-204AC, DO-15, Axial |
| Type | Zener |
| Unidirectional Channels | 1 |
Substitute Part Grouping Explanation
Substitution of the SA36ARLG is determined by strict equivalence across the following electrical and mechanical parameters:
- Voltage - Reverse Standoff: 36V
- Voltage - Clamping (Max) @ Ipp: 58.1V
- Current - Peak Pulse (10/1000µs): 8.6A nominal tolerance
- Power - Peak Pulse: 500W or higher
- Package / Case: DO-204AC (DO-15) axial configuration
- Type: Zener diode, unidirectional
Substitute parts are grouped into two categories:
Direct Electrical Equivalents (DO-204AC Package): Parts maintaining identical electrical specifications with 8.6A peak pulse current rating and 500W power dissipation in the same axial package form factor.
Higher Power Variants (P600 Package): Parts with identical voltage specifications but significantly higher current and power ratings (87.8A, 5kW), suitable for applications requiring enhanced transient protection capacity. These use the P600 package and are not pin-compatible with DO-204AC designs.
Parameter Comparison
| Part Number | Manufacturer | Voltage Standoff (V) | Voltage Clamp (V) | Peak Pulse Current (A) | Power Peak Pulse (W) | Package | Operating Temp (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|
| SA36ARLG | Littelfuse Inc. | 36 | 58.1 | 8.6 | 500 | DO-204AC | -55 ~ 150 | Obsolete |
| SA36A | Taiwan Semiconductor Corporation | 36 | 58.1 | 9 | 500 | DO-204AC | -55 ~ 175 | Active |
| SA36A-B | Littelfuse Inc. | 36 | 58.1 | 8.8 | 500 | DO-204AC | -55 ~ 175 | Active |
| P5KE36A-AP | Micro Commercial Co | 36 | 58.1 | 8.6 | 500 | DO-15 | -65 ~ 175 | Active |
| P5KE36A-BP | Micro Commercial Co | 36 | 58.1 | 8.6 | 500 | DO-15 | -65 ~ 175 | Active |
| P5KE36A-TP | Micro Commercial Co | 36 | 58.1 | 8.6 | 500 | DO-15 | -65 ~ 175 | Active |
| SA36A-E3/54 | Vishay General Semiconductor - Diodes Division | 36 | 58.1 | 8.6 | 500 | DO-204AC | -55 ~ 175 | Active |
| SA36AHE3/54 | Vishay General Semiconductor - Diodes Division | 36 | 58.1 | 8.6 | 500 | DO-204AC | -55 ~ 175 | Active |
| SLD36U-017 | Littelfuse Inc. | 36 | 58.1 | 87.8 | 5000 | P600 | -55 ~ 175 | Active |
| SLD36U-017-B | Littelfuse Inc. | 36 | 58.1 | 87.8 | 5000 | P600 | -55 ~ 175 | Active |
| 1N8166 | Microchip Technology | 36 | 59.1 | 2.54 | 150 | Axial | -55 ~ 175 | Active |
Engineering Selection Recommendations
For Direct Replacement (DO-204AC Package):
SA36A-E3/54 (Vishay) and SA36AHE3/54 (Vishay) are preferred direct replacements. Both maintain identical electrical specifications to the SA36ARLG, offer extended operating temperature range (-55°C to 175°C), and are ROHS3 compliant. SA36AHE3/54 includes AEC-Q101 automotive qualification, suitable for automotive and industrial applications requiring enhanced reliability standards.
SA36A-B (Littelfuse Inc.) provides an active alternative from the original manufacturer with nearly identical specifications (8.8A vs. 8.6A peak pulse current) and extended temperature range to 175°C.
SA36A (Taiwan Semiconductor Corporation) offers electrical equivalence with 9A peak pulse current and active product status, available in tape and reel packaging for high-volume applications.
For Extended Temperature Range:
P5KE36A-AP, P5KE36A-BP, and P5KE36A-TP (Micro Commercial Co) provide identical electrical performance with extended lower temperature rating (-65°C minimum) compared to the original part. These are suitable for applications requiring operation below -55°C.
For Higher Power Applications:
SLD36U-017 and SLD36U-017-B (Littelfuse Inc.) maintain identical voltage specifications but deliver 87.8A peak pulse current and 5kW power dissipation in the P600 package. These are not pin-compatible with DO-204AC designs and require circuit board redesign. Both include AEC-Q101 automotive qualification.
Not Recommended:
1N8166 (Microchip Technology) exhibits significantly reduced peak pulse current (2.54A) and power rating (150W), making it unsuitable for applications requiring the full 8.6A specification. Additionally, this part is RoHS non-compliant.
Frequently Asked Questions (FAQ)
Q: Can I use SA36A-E3/54 as a direct replacement for SA36ARLG in existing PCB designs?
A: Yes. SA36A-E3/54 maintains identical voltage specifications (36V standoff, 58.1V clamp), peak pulse current (8.6A), and power rating (500W) in the same DO-204AC axial package. No circuit modifications are required.
Q: What is the difference between SA36A-B and SA36A?
A: Both are electrically equivalent with 36V standoff and 58.1V clamping voltage. SA36A-B is supplied in bulk packaging by Littelfuse Inc., while SA36A is supplied in tape and reel by Taiwan Semiconductor Corporation. Peak pulse current differs slightly (8.8A vs. 9A), both within acceptable tolerance for the 36V class.
Q: Can I use SLD36U-017 in place of SA36ARLG?
A: No. While SLD36U-017 maintains identical voltage specifications, it uses the P600 package instead of DO-204AC, making it physically incompatible with existing PCB designs. Additionally, its 87.8A peak pulse current and 5kW power rating are designed for higher-energy transient protection applications. Circuit board redesign would be required.
Q: Why is 1N8166 not recommended as a substitute?
A: 1N8166 has significantly reduced electrical performance (2.54A peak pulse current vs. 8.6A, 150W vs. 500W power rating) and is RoHS non-compliant. It cannot provide equivalent transient protection for applications designed around the SA36ARLG specifications.
Q: Which substitute offers the widest operating temperature range?
A: P5KE36A-AP, P5KE36A-BP, and P5KE36A-TP all extend the lower temperature limit to -65°C (compared to -55°C for SA36ARLG) while maintaining the upper limit at 175°C. These are suitable for applications requiring operation in extreme cold environments.
Q: Are all substitute parts ROHS3 compliant?
A: Most active substitutes are ROHS3 compliant. Exception: 1N8166 is RoHS non-compliant and should not be used in applications requiring RoHS compliance.
Q: What does AEC-Q101 qualification mean?
A: AEC-Q101 is an automotive electronics qualification standard. SA36AHE3/54 and SLD36U-017/SLD36U-017-B carry this qualification, indicating they meet enhanced reliability and testing requirements for automotive applications.
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