1N5227B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5227B-TP is a 3.6 V Zener diode rated for 500 mW power dissipation in a DO-35 through-hole package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Due to its obsolete status and limited ongoing availability from the original manufacturer, identifying equivalent substitute parts is necessary to maintain design continuity and ensure procurement reliability for new production runs and field replacements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.6	V
Tolerance	±5	%
Power - Max	500	mW
Impedance (Max)	24	Ohms
Current - Reverse Leakage @ Vr	15	µA @ 1 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-35 (DO-204AH)

Substitute Part Grouping Explanation

Substitution of the 1N5227B-TP is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Zener voltage (Vz) nominal value: 3.6 V
Voltage tolerance: ±5%
Maximum power dissipation: 500 mW
Maximum impedance (Zzt): 24 Ohms
Reverse leakage current: 15 µA @ 1 V
Forward voltage drop: within specified limits
Operating temperature range: must encompass or exceed the original specification

Mechanical Equivalence Criteria:

Package type: DO-35 (DO-204AH) through-hole axial configuration
Pin compatibility: direct lead-to-lead substitution capability

The 1N5227B manufactured by Microchip Technology meets all electrical and mechanical equivalence requirements and qualifies as a direct substitute for the 1N5227B-TP.

Parameter Comparison

Parameter	1N5227B-TP (Micro Commercial Co)	1N5227B (Microchip Technology)	Match Status
Voltage - Zener (Nom)	3.6 V	3.6 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	500 mW	500 mW	Equivalent
Impedance (Max)	24 Ohms	24 Ohms	Equivalent
Current - Reverse Leakage @ Vr	15 µA @ 1 V	15 µA @ 1 V	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.5 V @ 200 mA	Substitute Higher
Operating Temperature Range	-55°C to 150°C	-65°C to 175°C	Substitute Wider
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-35 (DO-204AH)	DO-35 (DO-204AH)	Equivalent
Product Status	Obsolete	Active	Substitute Active

Engineering Selection Recommendations

The 1N5227B manufactured by Microchip Technology is a direct electrical and mechanical substitute for the 1N5227B-TP. The substitute part maintains all critical zener voltage, power rating, impedance, and leakage specifications. The forward voltage drop of the Microchip part is 0.4 V higher at rated current (1.5 V versus 1.1 V), which remains within acceptable design margins for typical zener diode applications. The operating temperature range of the Microchip substitute (-65°C to 175°C) exceeds the original specification, providing enhanced thermal performance.

The primary advantage of selecting the Microchip 1N5227B is its active product status and confirmed inventory availability (4652 units in stock), ensuring long-term procurement reliability compared to the obsolete Micro Commercial Co variant. Both parts carry identical ECCN and HTSUS classifications.

RoHS compliance differs between the two parts: the original 1N5227B-TP is ROHS3 compliant, while the Microchip substitute is RoHS non-compliant. Design teams must evaluate RoHS requirements for their specific application and regulatory jurisdiction before final component selection.

Frequently Asked Questions (FAQ)

Q: Can the Microchip 1N5227B directly replace the Micro Commercial Co 1N5227B-TP in existing designs?

A: Yes. Both parts share identical zener voltage (3.6 V), tolerance (±5%), power rating (500 mW), impedance (24 Ohms), reverse leakage current (15 µA @ 1 V), and DO-35 package configuration. The forward voltage difference (0.4 V) does not affect zener regulation performance in typical applications.

Q: What is the significance of the forward voltage difference between these parts?

A: The forward voltage specification applies to the diode's forward-biased conduction mode, not its zener regulation mode. In zener regulation circuits, the diode operates in reverse bias, where the zener voltage specification governs performance. The forward voltage difference is not a limiting factor for zener diode substitution.

Q: Does the wider operating temperature range of the Microchip part affect compatibility?

A: No. A wider operating temperature range (-65°C to 175°C versus -55°C to 150°C) is a performance enhancement. The substitute part maintains functionality across the original temperature specification and extends capability beyond it.

Q: What is the impact of RoHS compliance differences?

A: The original part is ROHS3 compliant; the substitute is RoHS non-compliant. Applications subject to RoHS regulations (primarily in EU markets) may require the compliant variant. Applications without RoHS mandates are unaffected by this difference.

Q: Are the DO-35 packages from both manufacturers mechanically identical?

A: Yes. Both parts use the DO-35 (DO-204AH) axial through-hole package. Lead spacing, diameter, and length are standardized, enabling direct board-level substitution without layout modifications.

Q: Why is the Microchip part listed as RoHS non-compliant if it is currently in active production?

A: RoHS compliance status reflects the specific manufacturing lot and supplier certification at the time of data collection. Microchip may produce both compliant and non-compliant variants depending on customer requirements and regional regulations. Compliance status should be verified with the current supplier datasheet.

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