1N5985B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5985B-TP is a 2.4 V, 500 mW Zener diode manufactured by Micro Commercial Co in DO-35 through-hole package configuration. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The 1N5985B-TP operates across a temperature range of -65°C to 200°C with ±5% voltage tolerance and is RoHS3 compliant.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	2.4	V
Tolerance	±5%	-
Power - Max	500	mW
Impedance (Max)	100	Ohms
Current - Reverse Leakage @ Vr	100	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 100 mA
Operating Temperature	-65 to 200	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the 1N5985B-TP is determined by the following critical parameters: nominal Zener voltage (2.4 V), maximum power dissipation (500 mW), voltage tolerance (±5%), reverse leakage current (100 µA @ 1 V), and through-hole DO-35 package configuration. All substitute parts listed maintain these core electrical specifications and package requirements.

Substitute parts are grouped into two categories based on product status and operational characteristics:

Category 1: Direct Electrical Equivalents (Active Status) Parts that match the 1N5985B-TP specifications with identical or superior electrical performance and active product status. These include 1N5985B TR PBFREE, 1N5221B BK PBFREE, and 1N5221B-TAP.

Category 2: Enhanced Performance Alternatives (Active Status) Parts that exceed the 1N5985B-TP specifications in specific parameters while maintaining core functionality. These include 1N5221B-TR, 1N5221C-TAP, 1N5221C-TR, BZX55B2V4-TAP, BZX55B2V4-TR, BZX55C2V4-TAP, and BZX55C2V4-TR.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Leakage @ 1V (µA)	Vf @ If (V)	Temp Range (°C)	Status	Package
1N5985B-TP	Micro Commercial Co	2.4	±5%	500	100	100	1.5 @ 100 mA	-65 to 200	Obsolete	DO-35
1N5985B TR PBFREE	Central Semiconductor Corp	2.4	±5%	500	100	100	1.5 @ 100 mA	-65 to 200	Active	DO-35
1N5221B BK PBFREE	Central Semiconductor Corp	2.4	±5%	500	30	100	1.1 @ 200 mA	-65 to 200	Active	DO-35
1N5221B-TAP	Vishay General Semiconductor	2.4	±5%	500	30	100	1.1 @ 200 mA	-65 to 175	Active	DO-35
1N5221B-TR	Vishay General Semiconductor	2.4	±5%	500	30	100	1.1 @ 200 mA	-65 to 175	Active	DO-35
1N5221C-TAP	Vishay General Semiconductor	2.4	±2%	500	30	100	1.1 @ 200 mA	-65 to 175	Active	DO-35
1N5221C-TR	Vishay General Semiconductor	2.4	±2%	500	30	100	1.1 @ 200 mA	-65 to 175	Active	DO-35
BZX55B2V4-TAP	Vishay General Semiconductor	2.4	±2%	500	85	50	1.5 @ 200 mA	-65 to 175	Active	DO-35
BZX55B2V4-TR	Vishay General Semiconductor	2.4	±2%	500	85	50	1.5 @ 200 mA	-65 to 175	Active	DO-35
BZX55C2V4-TAP	Vishay General Semiconductor	2.4	±5%	500	85	50	1.5 @ 200 mA	-65 to 175	Active	DO-35
BZX55C2V4-TR	Vishay General Semiconductor	2.4	±5%	500	85	50	1.5 @ 200 mA	-65 to 175	Active	DO-35

Engineering Selection Recommendations

Primary Recommendation: 1N5985B TR PBFREE

The 1N5985B TR PBFREE from Central Semiconductor Corp is the direct functional equivalent to the obsolete 1N5985B-TP. This part maintains identical electrical specifications including 2.4 V nominal Zener voltage, ±5% tolerance, 500 mW power rating, 100 Ohm maximum impedance, and -65°C to 200°C operating temperature range. The part is active in production status and RoHS3 compliant. The primary difference is packaging format (Tape & Reel versus bulk), which does not affect electrical performance.

Secondary Recommendation: 1N5221B Series (1N5221B BK PBFREE, 1N5221B-TAP, 1N5221B-TR)

The 1N5221B series from Central Semiconductor Corp and Vishay General Semiconductor provides functional equivalence with improved impedance characteristics (30 Ohms versus 100 Ohms). These parts maintain the 2.4 V nominal voltage and ±5% tolerance. The lower forward voltage (1.1 V @ 200 mA versus 1.5 V @ 100 mA) and reduced impedance result in superior performance in voltage regulation applications. All variants are active in production status and RoHS3 compliant. Operating temperature range is -65°C to 175°C, which is acceptable for most applications requiring the original -65°C to 200°C range.

Tertiary Recommendation: 1N5221C Series (1N5221C-TAP, 1N5221C-TR)

The 1N5221C series from Vishay General Semiconductor offers enhanced voltage tolerance (±2% versus ±5%), providing tighter Zener voltage regulation. These parts are qualified to AEC-Q101 automotive standard and carry automotive grade designation. Electrical specifications match the 1N5221B series with 30 Ohm impedance and improved forward voltage characteristics. Operating temperature is -65°C to 175°C. These parts are suitable for applications requiring higher precision voltage regulation.

Alternative Recommendation: BZX55 Series (BZX55B2V4 and BZX55C2V4 variants)

The BZX55 series from Vishay General Semiconductor provides functional equivalence with different impedance and leakage characteristics. BZX55B2V4 variants offer ±2% tolerance with 85 Ohm impedance and 50 µA reverse leakage. BZX55C2V4 variants maintain ±5% tolerance with identical impedance and leakage specifications. All BZX55 variants are qualified to AEC-Q101 automotive standard and carry automotive grade designation. Operating temperature is -65°C to 175°C. These parts are suitable for applications where the original 100 Ohm impedance specification is critical.

All recommended substitute parts are RoHS3 compliant and maintain through-hole DO-35 package configuration compatible with the original 1N5985B-TP footprint.

Frequently Asked Questions (FAQ)

Q: Can 1N5221B series parts directly replace the 1N5985B-TP?

A: Yes. The 1N5221B series maintains the critical electrical specifications of 2.4 V nominal Zener voltage, ±5% tolerance, and 500 mW power rating. The reduced impedance (30 Ohms versus 100 Ohms) and lower forward voltage represent performance improvements rather than incompatibilities. The operating temperature range of -65°C to 175°C covers the majority of applications requiring the original -65°C to 200°C specification.

Q: What is the difference between 1N5221B and 1N5221C variants?

A: The primary difference is voltage tolerance. 1N5221B parts maintain ±5% tolerance matching the original 1N5985B-TP specification. 1N5221C parts offer tighter ±2% tolerance for applications requiring more precise Zener voltage regulation. Both series share identical impedance (30 Ohms) and forward voltage characteristics (1.1 V @ 200 mA).

Q: Are packaging differences between TR (Tape & Reel), TAP (Cut Tape), and BK (Bulk) significant?

A: Packaging format differences do not affect electrical performance or component functionality. TR, TAP, and BK designations indicate supply format for procurement and assembly processes. Selection should be based on manufacturing requirements and inventory management practices rather than electrical specifications.

Q: Why do BZX55 series parts have different impedance values?

A: The BZX55 series is designed with 85 Ohm impedance as a standard specification for this product line. While this differs from the original 1N5985B-TP impedance of 100 Ohms, the BZX55 series maintains all other critical electrical parameters including 2.4 V nominal voltage, 500 mW power rating, and 100 µA reverse leakage current. The impedance difference is within acceptable tolerance for most voltage regulation applications.

Q: What does AEC-Q101 qualification indicate?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts carrying this qualification have undergone rigorous testing for reliability and performance in automotive applications. 1N5221C and BZX55 series parts with AEC-Q101 qualification are suitable for applications requiring automotive-grade component reliability.

Q: Is the operating temperature difference between -65°C to 200°C and -65°C to 175°C significant?

A: The original 1N5985B-TP operates to 200°C maximum junction temperature. Most substitute parts operate to 175°C maximum. This difference is significant only for applications requiring sustained operation above 175°C. For standard industrial and consumer applications operating below 175°C, this specification difference is not a limiting factor.

Q: Can I use 1N5985B TR PBFREE as a direct replacement without circuit modification?

A: Yes. The 1N5985B TR PBFREE is electrically identical to the 1N5985B-TP and requires no circuit modifications. The only difference is packaging format (Tape & Reel versus bulk), which does not affect electrical performance or PCB footprint compatibility.

Q: What does PBFREE designation indicate?

A: PBFREE indicates lead-free construction, compliant with RoHS (Restriction of Hazardous Substances) regulations. All substitute parts listed carry ROHS3 compliance designation, confirming lead-free construction and environmental compliance.

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