1N5239B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5239B is a through-hole zener diode rated at 9.1 V nominal with 500 mW power dissipation capability. Manufactured by SMC Diode Solutions, this component is classified as obsolete. Due to its obsolete status and limited availability from the original manufacturer, identifying equivalent substitute parts is necessary to maintain design continuity and ensure procurement reliability for applications requiring 9.1 V zener regulation.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	9.1	V
Tolerance	±5	%
Power - Maximum	500	mW
Impedance (Maximum)	10	Ohms
Current - Reverse Leakage @ Vr	3	µA
Voltage - Forward (Maximum) @ If	1.1 @ 200 mA	V
Mounting Type	Through Hole	—
Package / Case	DO-35, DO-204AH, Axial	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 1N5239B is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Zener voltage nominal rating: 9.1 V
Voltage tolerance: ±5%
Maximum power dissipation: 500 mW
Maximum impedance: 10 Ohms
Reverse leakage current: 3 µA specification
Forward voltage drop: 1.1 V @ 200 mA
Package type: DO-35 through-hole axial configuration
Moisture sensitivity level: 1 (Unlimited)

The substitute part 1N5239B TR PBFREE, manufactured by Central Semiconductor Corp, meets all electrical specifications and mechanical requirements. This part maintains identical zener voltage, power rating, impedance, and forward voltage characteristics. The primary distinction is product status: the substitute is active production, whereas the original is obsolete.

Parameter Comparison

Parameter	1N5239B (SMC)	1N5239B TR PBFREE (Central Semiconductor)	Match Status
Voltage - Zener (Nom)	9.1 V	9.1 V	Identical
Tolerance	±5%	±5%	Identical
Power - Max	500 mW	500 mW	Identical
Impedance (Max)	10 Ohms	10 Ohms	Identical
Current - Reverse Leakage @ Vr	3 µA @ 6.7 V	3 µA @ 7 V	Equivalent
Voltage - Forward (Max) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA	Identical
Operating Temperature	200°C	-65°C ~ 200°C	Substitute Exceeds
Mounting Type	Through Hole	Through Hole	Identical
Package / Case	DO-35, DO-204AH, Axial	DO-35, DO-204AH, Axial	Identical
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical
Product Status	Obsolete	Active	Substitute Active
RoHS Status	Not Specified	ROHS3 Compliant	Substitute Compliant

Engineering Selection Recommendations

The 1N5239B TR PBFREE from Central Semiconductor Corp is a direct functional equivalent for the obsolete 1N5239B from SMC Diode Solutions. Selection of this substitute is based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match or exceed the original specification. Zener voltage, power rating, impedance, and forward voltage characteristics are identical. Reverse leakage current specifications are equivalent within the measurement reference voltage variance.

Mechanical Compatibility: Both parts utilize identical DO-35 through-hole axial packaging, ensuring direct board-level compatibility without layout modification.

Product Status and Compliance: The substitute part is in active production, eliminating procurement risk associated with obsolete inventory. The substitute carries ROHS3 compliance certification, meeting current regulatory requirements for electronic component manufacturing.

Temperature Operating Range: The substitute provides an extended operating temperature range (-65°C to 200°C) compared to the original specification (200°C maximum), offering improved thermal performance margin in applications.

Availability: The substitute maintains substantial inventory (9440 pieces in stock) compared to the original part's limited obsolete stock (1800 pieces).

Frequently Asked Questions (FAQ)

Q: Can the 1N5239B TR PBFREE be used as a direct replacement for the 1N5239B in existing designs?

A: Yes. The substitute part meets all electrical and mechanical specifications of the original. Both components share identical zener voltage (9.1 V), power rating (500 mW), impedance (10 Ohms), and DO-35 through-hole package configuration. No circuit modification or board redesign is required.

Q: What is the significance of the "TR PBFREE" designation in the substitute part number?

A: The "TR" designation indicates tape reel packaging format (Cut Tape). "PBFREE" indicates lead-free (RoHS compliant) manufacturing. These designations reflect current manufacturing standards and do not affect electrical performance or functional compatibility.

Q: Are there differences in reverse leakage current specifications between the two parts?

A: Both parts specify 3 µA reverse leakage current. The measurement reference voltage differs slightly (6.7 V for the original, 7 V for the substitute), which is within normal specification variance and does not affect practical circuit performance.

Q: Does the substitute part's extended operating temperature range affect circuit design?

A: No. The substitute's operating range (-65°C to 200°C) encompasses the original specification (200°C maximum). This extended range provides additional thermal margin and does not require design modification.

Q: What compliance certifications does the substitute part carry?

A: The 1N5239B TR PBFREE carries ROHS3 compliance certification and maintains REACH Unaffected status, consistent with the original part. Both components are classified under ECCN EAR99 and HTSUS 8541.10.0050.

Q: Is the substitute part available in alternative packaging formats?

A: The substitute is supplied in Cut Tape (CT) packaging. The original part packaging format is not specified in the provided data. Both parts utilize identical DO-35 through-hole axial component packaging for board-level installation.

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