1N5248B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5248B-TP is an 18 V, 500 mW Zener diode manufactured by Micro Commercial Co in a DO-35 axial through-hole package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and production continuity. Substitute parts must maintain electrical performance across voltage regulation, power dissipation, and thermal operating ranges while preserving mechanical compatibility with existing circuit board layouts.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	18	V
Tolerance	±5	%
Power - Maximum	500	mW
Impedance (Maximum)	21	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 14 V
Voltage - Forward (Maximum) @ If	1.1	V @ 200 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial

Substitute Part Grouping Explanation

Substitution eligibility for the 1N5248B-TP is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nominal): 18 V
Tolerance: ±5%
Power - Maximum: 500 mW
Impedance (Maximum): 21 Ohms
Current - Reverse Leakage @ Vr: 100 nA @ 14 V
Mounting Type: Through Hole
Package / Case: DO-204AH, DO-35, Axial

All identified substitute parts meet these core electrical and mechanical specifications. Variations in forward voltage characteristics and operating temperature ranges are within acceptable engineering tolerances for zener diode applications and do not preclude functional substitution.

Parameter Comparison

Parameter	1N5248B-TP (Main)	1N5248B (Microchip)	1N5248B-1 (Microchip)	1N5248BTR (Fairchild)
Manufacturer	Micro Commercial Co	Microchip Technology	Microchip Technology	Fairchild Semiconductor
Product Status	Obsolete	Active	Active	Active
Voltage - Zener (Nom)	18 V	18 V	18 V	18 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	21 Ohms	21 Ohms	21 Ohms	21 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 14 V	100 nA @ 14 V	100 nA @ 14 V	100 nA @ 14 V
Voltage - Forward (Max) @ If	1.1 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.2 V @ 200 mA
Operating Temperature Range	-55 to 150°C	-65 to 175°C (TJ)	-65 to 175°C (TJ)	-65 to 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial

Engineering Selection Recommendations

1N5248B (Microchip Technology)

This part is an active product with expanded operating temperature range (-65 to 175°C) compared to the obsolete 1N5248B-TP. All core electrical parameters match specification. Forward voltage is specified at 1.5 V @ 200 mA, representing a 0.4 V increase from the main part. This part is available in bulk packaging and carries REACH Unaffected status.

1N5248B-1 (Microchip Technology)

This part is an active product with identical electrical specifications to the 1N5248B variant. Operating temperature range extends to -65 to 175°C (TJ). Forward voltage is specified at 1.5 V @ 200 mA. Inventory availability is lower than the 1N5248B variant. This part carries REACH Unaffected status.

1N5248BTR (Fairchild Semiconductor)

This part is an active product with the widest operating temperature range (-65 to 200°C) among all substitutes. Forward voltage is specified at 1.2 V @ 200 mA, representing a 0.1 V increase from the main part. All core electrical parameters match specification. This part carries REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can the 1N5248B (Microchip) directly replace the 1N5248B-TP in existing designs?

A: Yes. Both parts share identical zener voltage (18 V), tolerance (±5%), maximum power (500 mW), impedance (21 Ohms), reverse leakage current (100 nA @ 14 V), and package configuration (DO-35 axial through-hole). The Microchip variant operates across a wider temperature range (-65 to 175°C versus -55 to 150°C) and is currently in active production status.

Q: What is the significance of the forward voltage difference between the main part and substitutes?

A: The main part specifies 1.1 V @ 200 mA forward voltage. The Microchip variants specify 1.5 V @ 200 mA, and the Fairchild variant specifies 1.2 V @ 200 mA. These differences are within normal manufacturing tolerances for zener diodes and do not affect zener regulation performance in typical voltage regulation circuits. Forward voltage becomes relevant only in applications where the diode conducts in forward bias mode.

Q: Are all substitute parts compatible with the DO-35 package footprint?

A: Yes. All substitute parts are specified in DO-204AH, DO-35, axial package configuration. Mechanical dimensions and lead spacing are identical, enabling direct board-level substitution without layout modifications.

Q: Which substitute part offers the best thermal performance?

A: The 1N5248BTR (Fairchild Semiconductor) specifies the widest operating temperature range at -65 to 200°C, compared to -65 to 175°C for the Microchip variants. This extended upper temperature limit provides additional thermal margin in high-temperature applications.

Q: What is the difference between 1N5248B and 1N5248B-1?

A: Both parts are manufactured by Microchip Technology and share identical electrical specifications. The primary difference is inventory availability, with the 1N5248B carrying significantly higher stock levels (62,638 pcs versus 1,088 pcs for the 1N5248B-1).

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

A: All substitute parts carry REACH Unaffected status and EAR99 export classification. The main part is ROHS3 compliant, while the Microchip variants are RoHS non-compliant. The Fairchild variant does not specify RoHS status in the provided data. Compliance requirements should be verified against specific application and regional regulations.

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