SMAJ4737A-TP Equivalent & Substitute Parts

Part Overview

The SMAJ4737A-TP is a surface mount Zener diode rated at 7.5 V nominal voltage with 1 W maximum power dissipation in a DO-214AC (SMA) package. Manufactured by Micro Commercial Co, this component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications including Zener voltage, power rating, tolerance, operating temperature range, and package type. Alternative sources may be required due to inventory availability, supply chain considerations, or design flexibility across qualified manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	7.5	V
Tolerance	±5%	%
Power - Max	1	W
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMAJ4737A-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 7.5 V nominal
Tolerance: ±5%
Operating temperature range: -65°C to 150°C
Package type: DO-214AC / SMA surface mount
RoHS3 compliance
Moisture Sensitivity Level: 1

Secondary Compatibility Factors:

Power dissipation rating (1 W or higher)
Impedance characteristics (Zzt)
Reverse leakage current specifications
Forward voltage characteristics

Parts are grouped into two categories: Direct Equivalents (identical electrical and mechanical specifications) and Similar Alternatives (matching primary criteria with variations in secondary parameters such as power rating or impedance).

Parameter Comparison

Parameter	SMAJ4737A-TP	SMAZ7V5-TP	SMAZ7V5-13-F	CMZ5922B TR13 PBFREE	SZ1SMA5922BT3G
Manufacturer	Micro Commercial Co	Micro Commercial Co	Diodes Incorporated	Central Semiconductor Corp	onsemi
Voltage - Zener (Nom)	7.5 V	7.5 V	7.5 V	7.5 V	7.5 V
Tolerance	±5%	±5%	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W	500 mW	1.5 W
Impedance (Max)	4 Ohms	2 Ohms	2 Ohms	3 Ohms	3 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 5 V	5 µA @ 5 V	5 µA @ 5 V	5 µA @ 6 V	2.5 µA @ 6 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 100 mA	1.2 V @ 200 mA	1.2 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C
Package / Case	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Grade	—	—	—	—	Automotive
Qualification	—	—	—	—	AEC-Q101

Engineering Selection Recommendations

Direct Equivalents (Preferred for Drop-In Replacement):

SMAZ7V5-TP and SMAZ7V5-13-F are direct functional equivalents to the SMAJ4737A-TP. Both maintain the 7.5 V nominal Zener voltage, ±5% tolerance, 1 W power rating, and identical operating temperature range. All three parts are RoHS3 compliant with MSL 1 rating. SMAZ7V5-TP is manufactured by Micro Commercial Co (same as the main part), while SMAZ7V5-13-F is manufactured by Diodes Incorporated. Both substitute parts demonstrate improved impedance characteristics (2 Ohms versus 4 Ohms) and lower reverse leakage current (5 µA versus 10 µA), representing enhanced electrical performance within the same functional class.

Similar Alternatives (Application-Dependent Selection):

CMZ5922B TR13 PBFREE (Central Semiconductor Corp) is suitable for applications where power dissipation does not exceed 500 mW. This part maintains all primary matching criteria but operates at half the power rating of the main part. Selection is appropriate only when circuit design confirms maximum power dissipation remains below 500 mW.

SZ1SMA5922BT3G (onsemi) provides enhanced power handling at 1.5 W and includes automotive-grade qualification (AEC-Q101). This part is suitable for applications requiring automotive reliability standards or where additional thermal margin is beneficial. The higher power rating and lower reverse leakage current (2.5 µA) represent performance improvements over the main part.

All substitute parts maintain RoHS3 compliance, MSL 1 rating, and identical operating temperature specifications, ensuring regulatory and environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can SMAZ7V5-TP be used as a direct replacement for SMAJ4737A-TP?

A: Yes. SMAZ7V5-TP is a direct equivalent. Both parts share identical Zener voltage (7.5 V), tolerance (±5%), power rating (1 W), operating temperature range (-65 to 150°C), and package type (DO-214AC, SMA). SMAZ7V5-TP demonstrates superior electrical characteristics with lower impedance (2 Ohms versus 4 Ohms) and reduced reverse leakage current (5 µA versus 10 µA).

Q: What is the difference between SMAZ7V5-13-F and SMAJ4737A-TP?

A: SMAZ7V5-13-F is manufactured by Diodes Incorporated rather than Micro Commercial Co, but maintains identical electrical specifications: 7.5 V Zener voltage, ±5% tolerance, 1 W power rating, and DO-214AC/SMA package. The primary difference is manufacturer source. SMAZ7V5-13-F offers the same performance improvements as SMAZ7V5-TP with lower impedance and reverse leakage current.

Q: Can CMZ5922B TR13 PBFREE replace SMAJ4737A-TP in all applications?

A: CMZ5922B TR13 PBFREE is suitable only for applications where maximum power dissipation does not exceed 500 mW. This part is rated at 500 mW versus the 1 W rating of SMAJ4737A-TP. Circuit design must confirm that power dissipation remains below 500 mW before selecting this alternative.

Q: Is SZ1SMA5922BT3G compatible with SMAJ4737A-TP?

A: SZ1SMA5922BT3G is compatible and offers enhanced specifications. It maintains the 7.5 V Zener voltage, ±5% tolerance, and identical operating temperature range. The primary advantage is higher power rating (1.5 W versus 1 W) and automotive-grade qualification (AEC-Q101). This part is suitable for applications requiring automotive reliability or additional thermal margin.

Q: Do all substitute parts use the same package type?

A: Yes. All substitute parts use the DO-214AC (SMA) surface mount package, ensuring mechanical and electrical compatibility with the SMAJ4737A-TP footprint and PCB layout.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the regulatory and environmental specifications of SMAJ4737A-TP.

Q: What is the significance of the impedance difference between SMAJ4737A-TP and its substitutes?

A: Impedance (Zzt) affects the dynamic response of the Zener diode under transient conditions. SMAJ4737A-TP has a maximum impedance of 4 Ohms, while SMAZ7V5-TP and SMAZ7V5-13-F have 2 Ohms. Lower impedance provides faster transient response and tighter voltage regulation. The difference is significant in high-frequency or noise-sensitive applications.

Q: What does AEC-Q101 qualification mean for SZ1SMA5922BT3G?

A: AEC-Q101 is an automotive electronics qualification standard. SZ1SMA5922BT3G meets this standard, indicating suitability for automotive applications requiring enhanced reliability, temperature cycling, and stress testing validation. This qualification is not required for general industrial or consumer applications.

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