1SMB5917B-13 Equivalent & Substitute Parts

Part Overview

The 1SMB5917B-13 is a Zener diode rated at 4.7 V nominal with 550 mW maximum power dissipation in a Surface Mount SMB (DO-214AA) package. This component is classified as Obsolete, indicating it is no longer in active production. The availability of equivalent substitute parts is necessary to maintain design continuity and ensure procurement of functionally compatible components for new builds, repairs, and ongoing production support.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.7	V
Tolerance	±5%	%
Power - Max	550	mW
Impedance (Max)	5	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 1.5 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 1SMB5917B-13 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Zener voltage nominal value: 4.7 V
Zener voltage tolerance: ±5%
Package type: DO-214AA, SMB (Surface Mount)
Mounting type: Surface Mount
Operating temperature range: -65°C to 150°C
Impedance (Max): 5 Ohms
Reverse leakage current: 5 µA @ 1.5 V
Forward voltage: 1.5 V @ 200 mA

The substitute part 1SMB5917BT3G meets all critical electrical parameters and maintains identical package and mounting specifications. The primary difference is an increase in maximum power dissipation from 550 mW to 3 W, which represents an enhancement in thermal capability without affecting voltage regulation characteristics or circuit compatibility.

Parameter Comparison

Parameter	1SMB5917B-13 (Main)	1SMB5917BT3G (Substitute)	Match Status
Manufacturer	Diodes Incorporated	onsemi	Different Manufacturer
Voltage - Zener (Nom)	4.7 V	4.7 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	550 mW	3 W	Substitute Enhanced
Impedance (Max)	5 Ohms	5 Ohms	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 1.5 V	5 µA @ 1.5 V	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	Equivalent
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	Equivalent
Package / Case	DO-214AA, SMB	DO-214AA, SMB	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Obsolete	Active	Substitute Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent

Engineering Selection Recommendations

The 1SMB5917BT3G is the recommended substitute for the obsolete 1SMB5917B-13 based on the following engineering criteria:

Product Status Alignment: The main part is classified as Obsolete, while the substitute is Active. This ensures continued availability and supply chain reliability for procurement.

Electrical Equivalence: All critical voltage regulation parameters are identical, including nominal Zener voltage (4.7 V), tolerance (±5%), impedance (5 Ohms maximum), reverse leakage current (5 µA @ 1.5 V), and forward voltage characteristics (1.5 V @ 200 mA). These parameters determine circuit performance in voltage regulation applications.

Thermal Enhancement: The substitute provides increased maximum power dissipation (3 W versus 550 mW), which enhances thermal margin without introducing any electrical incompatibility. This improvement is beneficial for applications operating near thermal limits.

Compliance Certification: Both parts maintain ROHS3 compliance. The substitute carries EAR99 ECCN classification and is REACH Unaffected, compared to the main part's Obsolete ECCN status. This provides improved regulatory standing for new designs.

Package and Mounting Compatibility: Identical DO-214AA SMB package and Surface Mount specifications ensure direct mechanical and electrical interchangeability on printed circuit boards without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the 1SMB5917BT3G be used as a direct replacement for the 1SMB5917B-13 in existing designs?

A: Yes. The substitute maintains identical electrical characteristics for voltage regulation (4.7 V nominal, ±5% tolerance) and operates within the same temperature range (-65°C to 150°C). The package and mounting type are identical (DO-214AA, SMB Surface Mount), enabling direct substitution without circuit redesign or PCB layout changes.

Q: What is the significance of the increased power rating in the substitute part?

A: The 1SMB5917BT3G provides 3 W maximum power dissipation compared to 550 mW in the original part. This represents enhanced thermal capability and allows operation in applications with higher power dissipation requirements. The increased rating does not affect voltage regulation performance and is fully backward compatible.

Q: Are there any compliance or regulatory differences between the two parts?

A: Both parts are ROHS3 compliant. The main part carries an Obsolete ECCN classification, while the substitute is classified as EAR99 and is REACH Unaffected. These differences reflect the active production status of the substitute and provide improved regulatory standing for new procurement and design qualification.

Q: Does the different manufacturer (onsemi versus Diodes Incorporated) affect compatibility?

A: No. Both manufacturers produce components to the same electrical and mechanical specifications for this Zener diode type. The identical electrical parameters, package type, and operating characteristics ensure functional equivalence in circuit applications.

Q: What packaging options are available for the substitute part?

A: The 1SMB5917BT3G is supplied in Cut Tape (CT) and Digi-Reel® packaging formats, providing flexibility for both manual assembly and automated production environments.

Q: Are the impedance and leakage current specifications identical?

A: Yes. Both parts specify maximum impedance of 5 Ohms and reverse leakage current of 5 µA @ 1.5 V. These parameters are critical for voltage regulation stability and are fully equivalent between the main part and substitute.

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