Equivalent & Substitute Parts for SMBJ4737A/TR13 – Microchip Technology

Part Overview

The SMBJ4737A/TR13 from Microchip Technology is an active Zener Diode with a 7.5 V nominal Zener voltage, 2 W maximum power, and ±5% tolerance. It is offered in a surface mount DO-214AA (SMB) package and is typically used for voltage regulation and overvoltage protection in electronic circuits. The need to find equivalent or substitute models arises due to requirements such as compliance with RoHS regulations, supply availability, inventory management, or specific certification needs.

Key Parameters

Parameter	SMBJ4737A/TR13 Value
Voltage - Zener (Nom) (Vz)	7.5 V
Tolerance	±5%
Power - Max	2 W
Impedance (Max) (Zzt)	4 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 5 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature	-65°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB
Supplier Device Package	SMBJ (DO-214AA)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8541.10.0050

Substitute Part Grouping Explanation

Substitute parts for Zener diodes are determined strictly according to matching core electrical and mechanical parameters. The following parameters are used to establish equivalence: Zener voltage, tolerance, power rating, maximum impedance (Zzt), leakage current at specified reverse voltage, forward voltage at specified forward current, operating temperature range, mounting type, and package/case. Only parts matching these criteria are grouped as potential substitutes.

Parameter Comparison

Part Number	Manufacturer	Voltage - Zener (Nom) (Vz)	Tolerance	Power - Max	Impedance (Max) (Zzt)	Current - Reverse Leakage @ Vr	Voltage - Forward (Vf) (Max) @ If	Operating Temperature	Mounting Type	Package / Case	RoHS Status	MSL	REACH Status	Product Status
SMBJ4737A/TR13	Microchip Technology	7.5 V	±5%	2 W	4 Ohms	10 µA @ 5 V	1.2 V @ 200 mA	-65°C ~ 150°C	Surface Mount	DO-214AA, SMB	RoHS non-compliant	1 (Unlimited)	REACH Unaffected	Active
1SMB5922B-13	Diodes Incorporated	7.5 V	±5%	3 W	3 Ohms	5 µA @ 6 V	1.5 V @ 200 mA	-65°C ~ 150°C	Surface Mount	DO-214AA, SMB	ROHS3 Compliant	1 (Unlimited)	REACH Unaffected	Active
3SMBJ5922B-TP	Micro Commercial Co	7.5 V	±5%	3 W	3 Ohms	5 µA @ 6 V	1.5 V @ 200 mA	-55°C ~ 150°C	Surface Mount	DO-214AA, SMB	ROHS3 Compliant	1 (Unlimited)	REACH Unaffected	Active

Engineering Selection Recommendations

Based on the provided information, all parts listed are active and available. The substitute Zener diodes (1SMB5922B-13 and 3SMBJ5922B-TP) offer RoHS compliance while the original SMBJ4737A/TR13 is RoHS non-compliant. All options share the same mounting type, package, and similar electrical characteristics. The substitutes also have REACH Unaffected status and unlimited Moisture Sensitivity Level (MSL 1).

Frequently Asked Questions (FAQ)

Q1: What are the critical criteria for substituting a Zener diode in the DO-214AA (SMB) package?
A1: Substitution is strictly based on matching Zener voltage, tolerance, package type, mounting style, power rating, and electrical parameters such as impedance, leakage current, and forward voltage.

Q2: Are the 1SMB5922B-13 and 3SMBJ5922B-TP compatible in terms of package and footprint with SMBJ4737A/TR13?
A2: All parts use the DO-214AA, SMB surface mount package and are mechanically compatible.

Q3: How does RoHS compliance affect substitution decisions?
A3: If the application requires RoHS compliance, substitute parts 1SMB5922B-13 and 3SMBJ5922B-TP are appropriate since both are listed as ROHS3 Compliant.

Q4: Is there any difference in operating temperature ranges among these parts?
A4: SMBJ4737A/TR13 and 1SMB5922B-13 have an operating temperature range of -65°C ~ 150°C, while 3SMBJ5922B-TP supports -55°C ~ 150°C.

Q5: Do the substitute parts provide higher power rating compared to the main part?
A5: Substitute parts have a 3 W maximum power rating compared to the main part’s 2 W rating.

Q6: Can reverse leakage and forward voltage differences impact substitution?
A6: Substitute parts exhibit similar leakage and forward voltage values and are within standard parameters for equivalency in the Zener diode category.

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