1N5241B-T Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5241B-T is an 11 V, 500 mW Zener diode manufactured by Diodes Incorporated in DO-35 axial through-hole package. This component is classified as obsolete, indicating discontinuation by the original manufacturer. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for applications utilizing this Zener diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	11	V
Tolerance	±5%	—
Power - Maximum	500	mW
Impedance (Maximum)	22	Ohms
Current - Reverse Leakage @ Vr	2	µA @ 8.4 V
Voltage - Forward (Maximum) @ If	1.1	V @ 200 mA
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N5241B-T is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nominal): 11 V
Power - Maximum: 500 mW
Package / Case: DO-35 (DO-204AH) axial through-hole
Mounting Type: Through Hole

Secondary Compatibility Parameters:

Tolerance: ±5% or tighter (±2%, ±5%, ±10%)
Impedance (Maximum): 22 Ohms or lower
Current - Reverse Leakage: 2 µA @ 8.4 V or lower
Voltage - Forward (Maximum): 1.1 V @ 200 mA or lower
Operating Temperature Range: Minimum -65°C to maximum 175°C or higher

Substitute parts meeting these criteria are functionally interchangeable in applications designed for the 1N5241B-T specification. Parts with tighter tolerances (±2%) or lower impedance values provide enhanced performance characteristics while maintaining full compatibility.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (µA)	Vf @ If (V)	Temp Range (°C)	Status
1N5241B-T	Diodes Incorporated	11	±5%	500	22	2 @ 8.4	1.1 @ 200 mA	-65 to 200	Obsolete
1N5241A	Microsemi Corporation	11	±10%	500	22	2 @ 8.4	1.5 @ 200 mA	-65 to 175	Active
BZX79C11	Taiwan Semiconductor Corporation	11	±5%	500	20	0.1 @ 8	1.5 @ 100 mA	-65 to 175	Active
BZX79C11-T50A	onsemi	11	±5%	500	20	0.1 @ 8	1.5 @ 100 mA	-65 to 200	Active
1N3519A	Microchip Technology	11	±5%	500	8	Not specified	1.1 @ 200 mA	-65 to 175	Active
1N4698	Microsemi Corporation	11	±5%	500	Not specified	0.05 @ 8.4	1.1 @ 200 mA	-65 to 175	Active
1N5241B	Microchip Technology	11	±5%	500	22	2 @ 8.4	1.5 @ 200 mA	-65 to 175	Active
1N5241B-TAP	Vishay General Semiconductor - Diodes Division	11	±5%	500	22	2 @ 8.4	1.1 @ 200 mA	-65 to 175	Active
1N5241C-TAP	Vishay General Semiconductor - Diodes Division	11	±2%	500	22	2 @ 8.4	1.1 @ 200 mA	-65 to 175	Active

Engineering Selection Recommendations

Direct Equivalents (Highest Compatibility):

1N5241B (Microchip Technology) and 1N5241B-TAP (Vishay General Semiconductor - Diodes Division) provide the closest electrical and thermal equivalence to the 1N5241B-T. Both maintain ±5% tolerance, 22 Ohm impedance, and identical reverse leakage characteristics. The 1N5241B-TAP variant includes AEC-Q101 automotive qualification and ROHS3 compliance, suitable for applications requiring automotive-grade reliability.

Active Alternatives with Equivalent Performance:

BZX79C11-T50A (onsemi) operates across the full temperature range (-65°C to 200°C) matching the original part's thermal envelope. This part features lower impedance (20 Ohms) and reduced reverse leakage (100 nA @ 8 V), providing superior performance characteristics while maintaining ±5% tolerance and 500 mW power rating.

1N5241C-TAP (Vishay General Semiconductor - Diodes Division) offers tighter ±2% tolerance with AEC-Q101 automotive qualification and ROHS3 compliance, suitable for precision applications requiring enhanced voltage stability.

Compliance Considerations:

The original 1N5241B-T is ROHS3 compliant. Substitute parts 1N5241A, 1N4698, and 1N5241A (Microchip Technology) are RoHS non-compliant. For applications requiring RoHS compliance, select from BZX79C11-T50A, 1N5241B, 1N5241B-TAP, or 1N5241C-TAP.

Supply Availability:

BZX79C11-T50A (onsemi) maintains the highest inventory level (15,874 units), followed by 1N5241B-TAP (20,300 units) and 1N5241B (16,225 units), ensuring consistent supply chain access.

Frequently Asked Questions (FAQ)

Q: Can 1N5241A substitute for 1N5241B-T?

A: 1N5241A is electrically compatible with ±10% tolerance versus the original ±5%. Both operate at 11 V nominal with 500 mW power rating in DO-35 package. However, 1N5241A exhibits higher forward voltage (1.5 V @ 200 mA versus 1.1 V @ 200 mA) and operates to 175°C maximum versus the original 200°C. 1N5241A is RoHS non-compliant, whereas the original is ROHS3 compliant.

Q: What is the difference between BZX79C11 and BZX79C11-T50A?

A: Both parts are electrically identical with 11 V nominal voltage, ±5% tolerance, and 500 mW power rating. BZX79C11-T50A (onsemi) operates to 200°C maximum temperature, matching the original 1N5241B-T thermal range. BZX79C11 (Taiwan Semiconductor Corporation) operates to 175°C maximum. BZX79C11-T50A is supplied in Cut Tape (CT) packaging, while BZX79C11 is supplied in Tape & Reel (TR).

Q: Is 1N5241C-TAP a direct replacement?

A: 1N5241C-TAP is functionally compatible with tighter ±2% tolerance compared to the original ±5%. Both maintain 11 V nominal voltage, 500 mW power rating, 22 Ohm impedance, and DO-35 package. 1N5241C-TAP includes AEC-Q101 automotive qualification and ROHS3 compliance. Operating temperature is limited to 175°C maximum versus the original 200°C.

Q: Which substitute offers the best reverse leakage performance?

A: 1N4698 (Microsemi Corporation) provides the lowest reverse leakage at 50 nA @ 8.4 V. BZX79C11 and BZX79C11-T50A both specify 100 nA @ 8 V. The original 1N5241B-T specifies 2 µA @ 8.4 V. Lower reverse leakage reduces standby current consumption in voltage regulation applications.

Q: Are all substitutes available in DO-35 package?

A: All listed substitute parts are available in DO-35 (DO-204AH) axial through-hole package, ensuring mechanical and electrical compatibility with the original 1N5241B-T footprint.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 qualification indicates the component meets automotive industry reliability standards. 1N5241B-TAP and 1N5241C-TAP carry this qualification, suitable for automotive and mission-critical applications requiring enhanced quality assurance and temperature cycling validation.

Q: Can I use 1N3519A as a substitute?

A: 1N3519A is electrically compatible with 11 V nominal voltage, ±5% tolerance, and 500 mW power rating in DO-35 package. It features lower impedance (8 Ohms) and forward voltage (1.1 V @ 200 mA) matching the original. However, 1N3519A is RoHS non-compliant and reverse leakage specifications are not provided in the available data.

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