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P4SMA43A-Q Equivalent & Substitute Parts
Part Overview
The P4SMA43A-Q is an active Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., designed for telecom applications requiring transient protection. This unidirectional zener diode operates in the 36.8V reverse standoff voltage range with a 59.3V maximum clamping voltage and 6.9A peak pulse current capability. The component is packaged in DO-214AC (SMA) surface mount format and meets AEC-Q101 automotive qualification standards.
Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter ranges, ensuring functional interchangeability in circuit protection applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 36.8 | V |
| Voltage - Breakdown (Min) | 40.9 | V |
| Voltage - Clamping (Max) @ Ipp | 59.3 | V |
| Current - Peak Pulse (10/1000µs) | 6.9 | A |
| Power - Peak Pulse | 400 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AC, SMA | |
| Qualification | AEC-Q101 | |
| Type | Zener | |
| Unidirectional Channels | 1 |
Substitute Part Grouping Explanation
Substitution eligibility for TVS diodes in this category is determined by strict equivalence across the following critical parameters:
Voltage Parameters: Reverse standoff voltage (Typ), breakdown voltage (Min), and clamping voltage (Max) @ Ipp must fall within acceptable tolerance ranges to ensure the device provides equivalent transient protection without exceeding circuit voltage limits.
Current and Power Ratings: Peak pulse current (10/1000µs) and peak pulse power must match or exceed the original specification to maintain protection capability under transient events.
Package and Mounting: Surface mount package type (DO-214AC/SMA) and unidirectional channel configuration (1 channel) must be identical for mechanical and electrical compatibility.
Qualification and Compliance: AEC-Q101 automotive qualification and operating temperature range (-55°C to 150°C) ensure reliability in specified applications.
The substitute part SMAJE36AH meets these criteria with equivalent electrical performance and identical mechanical specifications.
Parameter Comparison
| Parameter | P4SMA43A-Q (Bourns) | SMAJE36AH (Eaton) | Compatibility |
|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 36.8V | 36V | Equivalent |
| Voltage - Breakdown (Min) | 40.9V | 40V | Equivalent |
| Voltage - Clamping (Max) @ Ipp | 59.3V | 58.1V | Equivalent |
| Current - Peak Pulse (10/1000µs) | 6.9A | 6.9A | Identical |
| Power - Peak Pulse | 400W | 400W | Identical |
| Operating Temperature Range | -55 to 150°C (TJ) | -55 to 150°C (TJ) | Identical |
| Package / Case | DO-214AC, SMA | DO-214AC, SMA | Identical |
| Type | Zener | Zener | Identical |
| Unidirectional Channels | 1 | 1 | Identical |
| Qualification | AEC-Q101 | AEC-Q101 | Identical |
| Product Status | Active | Active | Identical |
Engineering Selection Recommendations
Primary Selection: P4SMA43A-Q (Bourns Inc.) remains the specified component with 688 units in stock and full AEC-Q101 qualification for automotive telecom applications.
Substitute Selection: SMAJE36AH (Eaton - Electronics Division) is qualified as a direct substitute based on:
- Identical peak pulse current (6.9A) and power rating (400W)
- Equivalent voltage parameters within acceptable tolerance (reverse standoff 36V vs. 36.8V, clamping 58.1V vs. 59.3V)
- Identical operating temperature range (-55°C to 150°C)
- Identical surface mount package (DO-214AC/SMA)
- AEC-Q101 automotive qualification
- Higher inventory availability (5546 units in stock)
Both components are active products with ROHS3 compliance and REACH unaffected status, suitable for direct circuit substitution in telecom protection applications.
Frequently Asked Questions (FAQ)
Q: Can SMAJE36AH replace P4SMA43A-Q in existing designs?
A: Yes. Both devices are unidirectional zener TVS diodes with identical peak pulse ratings (6.9A, 400W), equivalent voltage parameters, and identical surface mount packaging (DO-214AC/SMA). Both meet AEC-Q101 automotive qualification and operate across the same temperature range (-55°C to 150°C).
Q: What are the voltage differences between these parts?
A: P4SMA43A-Q specifies 36.8V reverse standoff and 59.3V clamping voltage. SMAJE36AH specifies 36V reverse standoff and 58.1V clamping voltage. These differences fall within acceptable tolerance ranges for equivalent transient protection performance in telecom applications.
Q: Are the packages identical?
A: Yes. Both components use DO-214AC (SMA) surface mount packaging with identical pinout and mechanical dimensions, enabling direct board-level substitution without layout modifications.
Q: Do both parts meet automotive qualification requirements?
A: Yes. Both P4SMA43A-Q and SMAJE36AH carry AEC-Q101 automotive qualification, confirming reliability for automotive-grade telecom protection applications.
Q: What is the moisture sensitivity level for these parts?
A: Both components are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.
Q: Are there any compliance differences between these parts?
A: No. Both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS code 8541.10.0080.
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