Equivalent & Substitute Parts for 1N5247B-TP Zener Diode

Part Overview

The 1N5247B-TP is a 17 V, 500 mW Zener diode manufactured by Micro Commercial Co in DO-35 through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 1N5247B-TP serves voltage regulation and protection applications requiring a nominal Zener voltage of 17 V with ±5% tolerance and axial lead configuration.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	17	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	19	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 13 V
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 200 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 1N5247B-TP is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - Zener (Nom): 17 V (exact match required)
Tolerance: ±5% or tighter (±2% acceptable as upgrade)
Power - Max: 500 mW (minimum requirement)
Impedance (Max): 19 Ohms (maximum allowable)
Current - Reverse Leakage @ Vr: 100 nA @ 13 V (maximum allowable)
Voltage - Forward (Vf) (Max) @ If: 1.1 V to 1.5 V @ 200 mA (acceptable range)

Mechanical Compatibility Criteria:

Mounting Type: Through Hole (required)
Package / Case: DO-204AH, DO-35, Axial (required)

Packaging Variants: Substitute parts are available in multiple packaging formats: Tape & Reel (TR), Tape & Box (TB), Cut Tape (CT), and Bulk. These represent distribution packaging only and do not affect electrical or mechanical compatibility.

Product Status Consideration: Active product status substitutes are preferred over obsolete parts for long-term availability and supply chain continuity.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ 200mA (V)	Temp Range (°C)	Packaging	Product Status	RoHS
1N5247B-TP	Micro Commercial Co	17	±5%	500	19	1.1	-55 to 150	DO-35	Obsolete	ROHS3
1N5247B TR PBFREE	Central Semiconductor Corp	17	±5%	500	19	1.1	-65 to 200	DO-35 (TR)	Active	ROHS3
1N5247B	Microchip Technology	17	±5%	500	19	1.5	-65 to 175	DO-35 (Bulk)	Active	RoHS non-compliant
1N5247B-TAP	Vishay General Semiconductor	17	±5%	500	19	1.1	-55 to 175	DO-35 (TB)	Active	ROHS3
1N5247BTR	onsemi	17	±5%	500	19	1.2	-65 to 200	DO-35 (CT)	Active	ROHS3
1N5247C-TAP	Vishay General Semiconductor	17	±2%	500	19	1.1	-55 to 175	DO-35 (TB)	Active	ROHS3
1N5247C-TR	Vishay General Semiconductor	17	±2%	500	19	1.1	-55 to 175	DO-35 (TR)	Active	ROHS3

Engineering Selection Recommendations

Direct Electrical Equivalents (±5% Tolerance):

The following parts are direct electrical equivalents with identical Zener voltage tolerance and all critical electrical parameters within specification:

1N5247B TR PBFREE (Central Semiconductor Corp): Active status, extended temperature range (-65 to 200°C), ROHS3 compliant. Preferred for new designs requiring extended operating temperature.
1N5247B-TAP (Vishay General Semiconductor): Active status, automotive grade with AEC-Q101 qualification, ROHS3 compliant. Suitable for automotive and high-reliability applications.
1N5247BTR (onsemi): Active status, extended temperature range (-65 to 200°C), ROHS3 compliant, highest inventory availability (3699 pcs).

Electrical Equivalent with RoHS Consideration:

1N5247B (Microchip Technology): Active status, extended temperature range (-65 to 175°C). Note: RoHS non-compliant. Forward voltage specification is 1.5 V @ 200 mA, which is within acceptable range but represents upper limit.

Upgraded Tolerance Alternative (±2% Tolerance):

The following parts offer tighter Zener voltage tolerance (±2%) while maintaining all other electrical specifications:

1N5247C-TAP (Vishay General Semiconductor): Active status, automotive grade with AEC-Q101 qualification, ROHS3 compliant. Suitable when tighter voltage tolerance is required.
1N5247C-TR (Vishay General Semiconductor): Active status, automotive grade with AEC-Q101 qualification, ROHS3 compliant, Tape & Reel packaging.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status. Vishay parts (1N5247B-TAP, 1N5247C-TAP, 1N5247C-TR) include AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can I use 1N5247C parts as substitutes for 1N5247B?

A: Yes. The 1N5247C series offers tighter Zener voltage tolerance (±2% versus ±5%), which is a performance upgrade. All other electrical parameters (power rating, impedance, leakage current) are identical. This substitution is valid for applications where tighter voltage regulation is beneficial or required.

Q: What is the difference between packaging types (TR, TB, CT, Bulk)?

A: Packaging types represent distribution formats only: Tape & Reel (TR), Tape & Box (TB), Cut Tape (CT), and Bulk. These do not affect the electrical or mechanical properties of the diode itself. Selection depends on assembly process requirements and procurement volume.

Q: Is the Microchip 1N5247B suitable as a substitute despite RoHS non-compliance?

A: The Microchip 1N5247B is electrically compatible and functionally equivalent. However, RoHS compliance status should be evaluated against your application requirements and regional regulations. If RoHS3 compliance is mandatory, select alternatives from Central Semiconductor Corp, Vishay, or onsemi.

Q: Why do some substitutes have extended temperature ranges?

A: Extended temperature ranges (-65 to 200°C) represent enhanced specifications compared to the original part (-55 to 150°C). These are performance upgrades that expand operational capability without compromising compatibility. Selection depends on application thermal requirements.

Q: Are automotive-qualified parts (AEC-Q101) necessary for my application?

A: AEC-Q101 qualification is required only for automotive applications or systems requiring automotive-grade reliability standards. For general industrial or consumer applications, non-automotive qualified parts are functionally equivalent. Automotive-qualified options are available from Vishay (1N5247B-TAP, 1N5247C-TAP, 1N5247C-TR).

Q: What is the significance of forward voltage (Vf) variation between substitutes?

A: Forward voltage specifications range from 1.1 V to 1.5 V @ 200 mA across available substitutes. All values are within acceptable operating range and do not affect Zener regulation performance. Forward voltage becomes relevant only in applications where the diode conducts in forward bias mode.

Q: Can I mix different manufacturers' parts in the same circuit board?

A: Yes. All listed substitutes meet identical electrical and mechanical specifications for the 17 V, 500 mW Zener diode function. Mixing manufacturers is acceptable from an electrical standpoint. Consider procurement, supply chain, and documentation consistency for manufacturing and maintenance purposes.

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