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SMAJ30CE3/TR13 Transient Voltage Suppressor Diode - Equivalent & Substitute Parts
Part Overview
The SMAJ30CE3/TR13 is a surface-mount transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This bidirectional zener diode operates with a 30V reverse standoff voltage and provides clamping at 53.5V maximum, with a peak pulse current rating of 9.3A (10/1000µs). The component is packaged in DO-214AC (SMA) format and supplied on tape and reel. The product maintains active status with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).
Equivalent and substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits selection from multiple qualified manufacturers offering compatible electrical and mechanical characteristics within the same package family.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Reverse Standoff Voltage (Typ) | 30 | V |
| Breakdown Voltage (Min) | 33.3 | V |
| Clamping Voltage (Max) @ Ipp | 53.5 | V |
| Peak Pulse Current (10/1000µs) | 9.3 | A |
| Peak Pulse Power | 500 | W |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| Package Type | DO-214AC (SMA) | — |
| Mounting Type | Surface Mount | — |
| Bidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution eligibility for the SMAJ30CE3/TR13 is determined by strict adherence to the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Reverse standoff voltage: 30V (typical)
- Breakdown voltage minimum: 33.3V
- Bidirectional zener type with single channel
- Surface-mount packaging in DO-214AC (SMA) format
- RoHS3 compliance and MSL 1 rating
- Operating temperature range compatibility
Electrical Performance Tolerance: Substitute parts must maintain the same reverse standoff voltage (30V) and breakdown voltage threshold (33.3V minimum). Clamping voltage and peak pulse current may vary within the constraints of the same package family, as these parameters are determined by the specific diode design and do not affect mechanical compatibility or basic functional substitutability.
Identified Substitute Groups:
Group A - Direct Electrical Equivalents (48.4V Clamping, 8.3A Ipp):
- SMAJ30CA (Good-Ark Semiconductor)
- SMAJ30CA-13-F (Diodes Incorporated)
- SMAJ30CA-TP (Micro Commercial Co)
These parts share identical reverse standoff voltage, breakdown voltage, and operating temperature ranges compatible with the main part. Clamping voltage is lower (48.4V vs. 53.5V), and peak pulse current is slightly reduced (8.3A vs. 9.3A), but both remain within the same package envelope and electrical class.
Group B - Enhanced Performance Variants (64.3V Clamping, 36A Ipp):
- SM4T35CAY (STMicroelectronics)
- SMAJ30CA-TR (STMicroelectronics)
These parts maintain the same 30V reverse standoff and 33.3V breakdown voltage but offer higher clamping voltage (64.3V) and significantly higher peak pulse current (36A at 8/20µs). Both are AEC-Q101 qualified (SM4T35CAY) or carry automotive-grade designation. Operating temperature ranges are compatible (-55°C to 150°C or -55°C to 150°C).
Parameter Comparison
| Parameter | SMAJ30CE3/TR13 (Microchip) | SMAJ30CA (Good-Ark) | SMAJ30CA-13-F (Diodes Inc) | SMAJ30CA-TP (MCC) | SM4T35CAY (STMicro) | SMAJ30CA-TR (STMicro) |
|---|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Good-Ark Semiconductor | Diodes Incorporated | Micro Commercial Co | STMicroelectronics | STMicroelectronics |
| Reverse Standoff Voltage (Typ) | 30V | 30V | 30V | 30V | 30V | 30V |
| Breakdown Voltage (Min) | 33.3V | 33.3V | 33.3V | 33.3V | 33.3V | 33.3V |
| Clamping Voltage (Max) @ Ipp | 53.5V | 48.4V | 48.4V | 48.4V | 64.3V | 64.3V |
| Peak Pulse Current | 9.3A (10/1000µs) | 8.3A (10/1000µs) | 8.3A (10/1000µs) | 8.3A (10/1000µs) | 36A (8/20µs) | 36A (8/20µs) |
| Peak Pulse Power | 500W | 400W | 400W | 400W | 400W | 400W |
| Operating Temperature | -65 to 150°C (TJ) | -55 to 150°C (TJ) | -55 to 150°C (TJ) | -55 to 175°C (TA) | -55 to 150°C (TJ) | -55 to 150°C (TJ) |
| Package / Case | DO-214AC (SMA) | DO-214AC (SMA) | DO-214AC (SMA) | DO-214AC (SMA) | DO-214AC (SMA) | DO-214AC (SMA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Bidirectional Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Substitution Compatibility Assessment:
All identified substitute parts maintain full mechanical and electrical compatibility with the SMAJ30CE3/TR13 within the constraints of the DO-214AC (SMA) package family. Selection among alternatives is based on the following engineering considerations:
Group A Substitutes (SMAJ30CA, SMAJ30CA-13-F, SMAJ30CA-TP): These parts are suitable for applications where the primary part experiences supply unavailability. The reduced clamping voltage (48.4V vs. 53.5V) and slightly lower peak pulse current (8.3A vs. 9.3A) remain within acceptable tolerance for general-purpose transient suppression. All three maintain active product status, full RoHS3 compliance, and MSL 1 rating. SMAJ30CA-TP offers extended operating temperature range to 175°C (TA), providing additional thermal margin in high-temperature environments.
Group B Substitutes (SM4T35CAY, SMAJ30CA-TR): These STMicroelectronics parts provide enhanced performance characteristics with higher clamping voltage (64.3V) and significantly increased peak pulse current (36A). SM4T35CAY carries AEC-Q101 automotive qualification, making it suitable for automotive and mission-critical applications. Both maintain compatibility with the 30V standoff voltage and 33.3V breakdown threshold. Selection of Group B parts is appropriate when circuit design permits higher clamping voltage or when enhanced transient suppression capability is required.
Compliance and Certification: All substitute parts maintain RoHS3 compliance and MSL 1 rating, ensuring compatibility with standard surface-mount assembly processes and environmental regulations. No additional qualification or testing is required for direct substitution within the same application context.
Frequently Asked Questions (FAQ)
Q1: Can SMAJ30CA parts be used as direct replacements for SMAJ30CE3/TR13?
A: Yes. SMAJ30CA, SMAJ30CA-13-F, and SMAJ30CA-TP are direct mechanical and electrical substitutes. All maintain the same 30V reverse standoff voltage, 33.3V breakdown voltage minimum, and DO-214AC (SMA) package format. The reduced clamping voltage (48.4V vs. 53.5V) and peak pulse current (8.3A vs. 9.3A) do not affect mechanical compatibility or basic functional substitutability in general-purpose applications.
Q2: What is the difference between Group A and Group B substitute parts?
A: Group A parts (SMAJ30CA variants) provide equivalent electrical performance with slightly reduced clamping voltage and current ratings. Group B parts (SM4T35CAY, SMAJ30CA-TR) offer enhanced performance with higher clamping voltage (64.3V) and peak pulse current (36A at 8/20µs). Both groups maintain the same 30V standoff voltage and are mechanically compatible. Selection depends on application requirements for transient suppression capability.
Q3: Are there temperature range differences between substitute parts?
A: Yes. The main part operates from -65°C to 150°C (TJ). Most substitutes operate from -55°C to 150°C (TJ), providing a narrower low-temperature range. SMAJ30CA-TP extends to 175°C (TA), offering higher temperature capability. Verify application temperature requirements before selection.
Q4: Do all substitute parts have the same packaging and mounting characteristics?
A: Yes. All substitute parts use DO-214AC (SMA) surface-mount packaging with identical mechanical dimensions and land pattern compatibility. All are supplied with RoHS3 compliance and MSL 1 rating, ensuring compatibility with standard reflow assembly processes.
Q5: Which substitute part should be selected for automotive applications?
A: SM4T35CAY (STMicroelectronics) carries AEC-Q101 automotive qualification and is suitable for automotive-grade applications. SMAJ30CA-TR (STMicroelectronics) is designated as automotive-grade. Both maintain the required 30V standoff voltage and DO-214AC package format.
Q6: What is the impact of lower clamping voltage in Group A substitutes?
A: Group A parts clamp at 48.4V compared to 53.5V for the main part. This lower clamping voltage provides tighter transient suppression and may be advantageous in sensitive circuits. Verify that protected components tolerate the lower clamping threshold before substitution.
Q7: Can Group B parts with higher peak pulse current be used in all applications?
A: Group B parts (36A peak pulse current) are compatible with all applications designed for the main part (9.3A). The higher current rating provides additional transient suppression margin. However, verify that the higher clamping voltage (64.3V) is acceptable for the protected circuit.
Q8: Are all substitute parts in active production status?
A: Yes. All identified substitute parts maintain active product status with manufacturers, ensuring continued availability and supply chain stability.
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