1SMB5948B-13 Equivalent & Substitute Parts

Part Overview

The 1SMB5948B-13 is a Zener diode manufactured by Diodes Incorporated, rated for 91 V nominal Zener voltage with 3 W maximum power dissipation in a surface mount SMB package. This component is classified as an active product with full RoHS3 compliance and unlimited moisture sensitivity rating. The part is suitable for voltage regulation, transient suppression, and reference applications in electronic circuits requiring stable 91 V regulation points.

Substitute parts are identified when electrical parameters, mechanical packaging, and operational characteristics align within the specified tolerances and ratings of the original component.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	91	V
Tolerance	±5%	%
Power - Max	3	W
Impedance (Max)	200	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 69.2 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 150	°C
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the 1SMB5948B-13 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

Zener voltage nominal rating: 91 V
Tolerance specification: ±5%
Maximum power dissipation: 3 W
Package type: DO-214AA (SMB)
Mounting configuration: Surface Mount
Impedance maximum: 200 Ohms
Reverse leakage current: 1 µA @ 69.2 V
Forward voltage: 1.5 V @ 200 mA
Operating temperature range: -65°C to 150°C

Parts qualify as substitutes only when all electrical ratings and mechanical specifications match exactly within the provided tolerances. No parameter deviation is permitted for substitution classification.

Parameter Comparison

Parameter	1SMB5948B-13 (Main Part)	1SMB5948B-13 (Substitute)	Match Status
Manufacturer	Diodes Incorporated	Diodes Incorporated	Identical
Voltage - Zener (Nom)	91 V	91 V	Identical
Tolerance	±5%	±5%	Identical
Power - Max	3 W	3 W	Identical
Impedance (Max)	200 Ohms	200 Ohms	Identical
Current - Reverse Leakage @ Vr	1 µA @ 69.2 V	1 µA @ 69.2 V	Identical
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	Identical
Operating Temperature Range	-65°C to 150°C	-65°C to 150°C	Identical
Package / Case	DO-214AA, SMB	DO-214AA, SMB	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical
Product Status	Active	Active	Identical

Engineering Selection Recommendations

The 1SMB5948B-13 is an active product with full RoHS3 compliance and REACH unaffected status, suitable for deployment in regulated manufacturing environments. The component carries MSL Level 1 (Unlimited) moisture sensitivity rating, indicating no moisture-related storage restrictions.

Selection of substitute components should be based on:

Electrical Parameter Matching: All voltage, power, impedance, and leakage specifications must align exactly with the original part ratings.
Compliance Verification: Substitute parts must maintain ROHS3 compliance and REACH unaffected status to ensure regulatory alignment with the original component.
Package Compatibility: The DO-214AA (SMB) surface mount package must be identical to ensure PCB footprint and assembly process compatibility.
Thermal Performance: Operating temperature range of -65°C to 150°C must be maintained to ensure functional performance across specified environmental conditions.
Inventory Status: Active product status confirms ongoing availability and manufacturing support for the specified part number.

Frequently Asked Questions (FAQ)

Q: What defines a valid substitute for the 1SMB5948B-13?

A: A valid substitute must match all electrical parameters including 91 V nominal Zener voltage, ±5% tolerance, 3 W maximum power, 200 Ohms maximum impedance, and identical package configuration (DO-214AA SMB). Operating temperature range, forward voltage, and reverse leakage specifications must also align exactly.

Q: Can I use a different Zener voltage rating as a substitute?

A: No. The Zener voltage rating is the primary functional parameter. Only parts rated at 91 V nominal with ±5% tolerance are substitutes. Different voltage ratings are not compatible for this application.

Q: Is the SMB package interchangeable with other surface mount packages?

A: No. The DO-214AA (SMB) package is specific to this component. PCB footprints, lead spacing, and thermal characteristics are designed for this package type. Alternative packages require PCB redesign and are not direct substitutes.

Q: What is the significance of the ±5% tolerance specification?

A: The ±5% tolerance defines the acceptable Zener voltage variation from the 91 V nominal rating. This tolerance band (86.45 V to 95.55 V) must be maintained in substitute parts to ensure circuit regulation performance.

Q: Does RoHS3 compliance affect substitution eligibility?

A: Yes. Both the main part and substitute must maintain ROHS3 compliance status. This ensures regulatory alignment and material composition consistency across supply chains.

Q: What does MSL Level 1 (Unlimited) mean for component handling?

A: MSL Level 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. This simplifies logistics and inventory management compared to higher MSL ratings.

Q: Can I substitute based on power rating alone?

A: No. Power rating is one of multiple critical parameters. Substitution requires matching all specified electrical characteristics, including voltage, impedance, leakage current, and forward voltage, in addition to power rating.

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