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SML4737A-E3/5A Equivalent & Substitute Parts
Part Overview
The SML4737A-E3/5A is a Zener diode rated at 7.5 V, 1 W, manufactured by Vishay General Semiconductor - Diodes Division in the DO-214AC (SMA) surface mount package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and production continuity. The diode is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and is suitable for voltage regulation and protection applications in surface mount designs.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nominal) | 7.5 | V |
| Tolerance | ±5% | — |
| Power - Maximum | 1 | W |
| Impedance (Maximum) | 4 | Ohms |
| Current - Reverse Leakage @ Vr | 10 | µA @ 5 V |
| Operating Temperature | 150 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | DO-214AC, SMA | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the SML4737A-E3/5A is determined by the following critical parameters: nominal Zener voltage of 7.5 V, surface mount DO-214AC (SMA) package compatibility, and ROHS3 compliance. All substitute parts listed maintain the 7.5 V Zener voltage specification and operate within the same package footprint, ensuring mechanical and electrical compatibility in existing PCB designs.
Substitute parts are grouped into two categories based on power rating and tolerance specifications:
Category 1: 1 W Power Rating (Direct Electrical Equivalent) Parts with 1 W maximum power rating provide direct functional equivalence to the original SML4737A-E3/5A. These include the SMAJ4737A-TP from Micro Commercial Co, which maintains identical power and voltage specifications with active product status.
Category 2: Enhanced Power Rating (1.5 W to 3 W) Parts with power ratings of 1.5 W or higher provide superior thermal performance and current handling capability while maintaining the 7.5 V Zener voltage. These include the 1SMA5922BT3G (onsemi, 1.5 W), SZ1SMA5922BT3G (onsemi, 1.5 W, AEC-Q101 automotive qualified), CZRA5922B-G (Comchip Technology, 1.5 W), and SMAJ5922 series parts (Microchip Technology, 3 W). These higher-power alternatives are suitable for applications requiring increased power dissipation margins.
All substitute parts are ROHS3 compliant with MSL 1 rating and maintain surface mount compatibility.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vz (Nominal) | Tolerance | Power (Max) | Zzt (Max) | Reverse Leakage @ Vr | Operating Temp | Package | Product Status | Packaging Type |
|---|---|---|---|---|---|---|---|---|---|---|
| SML4737A-E3/5A | Vishay | 7.5 V | ±5% | 1 W | 4 Ω | 10 µA @ 5 V | 150°C | DO-214AC, SMA | Obsolete | — |
| SMAJ4737A-TP | Micro Commercial Co | 7.5 V | ±5% | 1 W | 4 Ω | 10 µA @ 5 V | -65°C ~ 150°C | DO-214AC, SMA | Active | Tape & Reel |
| 1SMA5922BT3G | onsemi | 7.5 V | ±5% | 1.5 W | 3 Ω | 2.5 µA @ 6 V | -65°C ~ 150°C | DO-214AC, SMA | Active | Cut Tape & Digi-Reel |
| CMZ5922B BK PBFREE | Central Semiconductor Corp | 7.5 V | ±5% | 500 mW | 3 Ω | 5 µA @ 6 V | -65°C ~ 150°C | DO-214AC, SMA | Active | Bulk |
| CMZ5922B TR13 PBFREE | Central Semiconductor Corp | 7.5 V | ±5% | 500 mW | 3 Ω | 5 µA @ 6 V | -65°C ~ 150°C | DO-214AC, SMA | Active | Tape & Reel |
| CZRA5922B-G | Comchip Technology | 7.5 V | ±5% | 1.5 W | 3 Ω | 5 µA @ 6 V | -55°C ~ 175°C | DO-214AC, SMA | Active | Tape & Reel |
| SMAJ5922AE3/TR13 | Microchip Technology | 7.5 V | ±10% | 3 W | 3 Ω | 5 µA @ 6 V | -65°C ~ 150°C | DO-214AC, SMA | Active | Tape & Reel |
| SMAJ5922BE3/TR13 | Microchip Technology | 7.5 V | ±5% | 3 W | 3 Ω | 5 µA @ 6 V | -65°C ~ 150°C | DO-214AC, SMA | Active | Tape & Reel |
| SMAJ5922CE3/TR13 | Microchip Technology | 7.5 V | ±2% | 3 W | 3 Ω | 5 µA @ 6 V | -65°C ~ 150°C | DO-214AC, SMA | Active | Tape & Reel |
| SZ1SMA5922BT3G | onsemi | 7.5 V | ±5% | 1.5 W | 3 Ω | 2.5 µA @ 6 V | -65°C ~ 150°C | DO-214AC, SMA | Active | Tape & Reel |
Engineering Selection Recommendations
Direct Replacement (Identical Specifications)
The SMAJ4737A-TP from Micro Commercial Co is the primary direct replacement for the SML4737A-E3/5A. This part maintains identical electrical specifications (7.5 V, 1 W, ±5% tolerance, 4 Ω impedance) and package configuration. The SMAJ4737A-TP is active in production status and ROHS3 compliant, providing immediate design continuity with no circuit modifications required.
Enhanced Performance Alternatives
For applications where increased power dissipation capability is beneficial, the following active parts provide superior thermal performance while maintaining 7.5 V Zener voltage and package compatibility:
The 1SMA5922BT3G and SZ1SMA5922BT3G from onsemi both offer 1.5 W power rating with improved impedance characteristics (3 Ω versus 4 Ω). The SZ1SMA5922BT3G carries AEC-Q101 automotive qualification, suitable for automotive and high-reliability applications. Both parts are available in active production status.
The SMAJ5922 series from Microchip Technology (SMAJ5922AE3/TR13, SMAJ5922BE3/TR13, SMAJ5922CE3/TR13) provides 3 W power rating with varying tolerance specifications (±10%, ±5%, ±2% respectively). These parts are suitable for applications requiring maximum thermal margin and are active in production.
The CZRA5922B-G from Comchip Technology offers 1.5 W power rating with extended operating temperature range (-55°C to 175°C) compared to the original part's 150°C maximum, providing enhanced thermal performance for high-temperature environments.
Lower Power Alternative
The CMZ5922B series from Central Semiconductor Corp (available in bulk and tape & reel packaging) provides 500 mW power rating. This part is suitable only for applications where the original 1 W specification can be reduced without circuit performance degradation.
All recommended substitutes maintain ROHS3 compliance and MSL 1 moisture sensitivity rating.
Frequently Asked Questions (FAQ)
Q: Can the SMAJ4737A-TP be used as a direct drop-in replacement for the SML4737A-E3/5A?
A: Yes. The SMAJ4737A-TP maintains identical electrical specifications (7.5 V nominal Zener voltage, 1 W power rating, ±5% tolerance, 4 Ω impedance) and uses the same DO-214AC (SMA) surface mount package. No circuit modifications are required for substitution.
Q: What is the difference between the 1 W rated SMAJ4737A-TP and the 1.5 W rated 1SMA5922BT3G?
A: Both parts maintain the 7.5 V Zener voltage and ±5% tolerance. The primary differences are power rating (1 W versus 1.5 W) and impedance (4 Ω versus 3 Ω). The 1.5 W part provides greater thermal margin and lower impedance, beneficial for applications with higher current demands or stricter regulation requirements. Both use identical DO-214AC (SMA) packages and are pin-compatible.
Q: Is the SZ1SMA5922BT3G suitable for automotive applications?
A: Yes. The SZ1SMA5922BT3G carries AEC-Q101 automotive qualification and is rated for -65°C to 150°C operating temperature. This part is suitable for automotive and high-reliability applications requiring automotive-grade components.
Q: What is the significance of the tolerance differences among substitute parts?
A: Tolerance specifications define the allowable deviation from the nominal 7.5 V Zener voltage. The original SML4737A-E3/5A and most substitutes carry ±5% tolerance. The SMAJ5922CE3/TR13 offers tighter ±2% tolerance for applications requiring more precise voltage regulation. The SMAJ5922AE3/TR13 carries ±10% tolerance and is suitable only for applications where broader voltage tolerance is acceptable.
Q: Can lower power-rated parts like the CMZ5922B (500 mW) be used in place of the 1 W original?
A: The CMZ5922B can be used only if the application circuit operates at power levels below 500 mW. The original 1 W specification must be verified against actual circuit power dissipation requirements. Using an undersized part in a 1 W application will result in thermal stress and potential component failure.
Q: What packaging options are available for substitute parts?
A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR) for automated assembly, Cut Tape & Digi-Reel for smaller quantities, and Bulk for manual assembly. The SMAJ4737A-TP, CMZ5922B TR13 PBFREE, and SMAJ5922 series are available in Tape & Reel format suitable for high-volume production. The 1SMA5922BT3G is available in Cut Tape & Digi-Reel format.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity level, matching the compliance profile of the original SML4737A-E3/5A.
Q: What is the operating temperature range difference between the original part and substitutes?
A: The original SML4737A-E3/5A is rated to 150°C maximum. Most substitutes extend the lower temperature limit to -65°C, providing broader operating range. The CZRA5922B-G extends the upper temperature limit to 175°C, suitable for high-temperature applications. Verify application temperature requirements before selection.
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