1N5240C-TAP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5240C-TAP is a 10 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in DO-35 (DO-204AH) through-hole axial package. This component is classified as an active product with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained within specified tolerance ranges, enabling component sourcing flexibility across multiple manufacturers and packaging configurations.

Key Parameters

Parameter	1N5240C-TAP
Voltage - Zener (Nom)	10 V
Tolerance	±2%
Power - Max	500 mW
Impedance (Max)	17 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 8 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA
Operating Temperature	175°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 1N5240C-TAP is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nom): 10 V (exact match required)
Power - Max: 500 mW or greater
Tolerance: ±2% or ±5% acceptable
Impedance (Max): 17 Ohms to 20 Ohms range
Operating Temperature: minimum 175°C junction temperature

Mechanical Compatibility Criteria:

Mounting Type: Through Hole
Package / Case: DO-204AH (DO-35) or equivalent axial through-hole packages

Compliance Considerations:

RoHS Status: ROHS3 compliant preferred for automotive applications
Product Status: Active

Substitute parts are grouped into three categories based on these parameters: (1) Direct equivalents with identical package and ±2% tolerance, (2) Functional equivalents with ±5% tolerance and same power rating, and (3) Higher power-rated alternatives with compatible through-hole packages.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Package	Mounting Type	Operating Temp	RoHS Status
1N5240C-TAP	Vishay	10 V	±2%	500 mW	17 Ohms	DO-35	Through Hole	175°C	ROHS3
1N5240B	Microchip Technology	10 V	±5%	500 mW	17 Ohms	DO-35	Through Hole	-65°C ~ 175°C	Non-compliant
1N5240BTR	Fairchild Semiconductor	10 V	±5%	500 mW	17 Ohms	DO-35	Through Hole	-65°C ~ 200°C	Not specified
1N758A	Good-Ark Semiconductor	10 V	±5%	500 mW	17 Ohms	DO-35	Through Hole	175°C	ROHS3
1N4104	Microchip Technology	10 V	±5%	500 mW	200 Ohms	DO-7	Through Hole	-65°C ~ 175°C	Non-compliant
1N4465	Microchip Technology	10 V	±5%	1.5 W	5 Ohms	DO-41	Through Hole	-65°C ~ 175°C	Non-compliant
BZX79-B10,113	Nexperia USA Inc.	10 V	±2%	400 mW	20 Ohms	DO-35	Through Hole	-65°C ~ 200°C	ROHS3
BZX79-B10,133	Nexperia USA Inc.	10 V	±2%	400 mW	20 Ohms	DO-35	Through Hole	-65°C ~ 200°C	ROHS3
BZX79-B10,143	NXP USA Inc.	10 V	±2%	400 mW	20 Ohms	DO-35	Through Hole	-65°C ~ 200°C	Not specified
BZX79C10	Taiwan Semiconductor Corporation	10 V	±5%	500 mW	20 Ohms	DO-35	Through Hole	-65°C ~ 175°C	ROHS3
BZV55-B10,115	NXP Semiconductors	10 V	±2%	500 mW	20 Ohms	MINI-MELF	Surface Mount	-65°C ~ 200°C	Not specified

Engineering Selection Recommendations

Category 1: Direct Package Equivalents (DO-35 Through Hole)

The following parts maintain identical package configuration and are suitable for direct board-level substitution:

1N5240B, 1N5240BTR, 1N758A, BZX79-B10,113, BZX79-B10,133, BZX79-B10,143, and BZX79C10 all feature DO-35 through-hole axial packages compatible with the original 1N5240C-TAP footprint.

Among these, 1N758A and BZX79-B10,113 maintain ROHS3 compliance matching the original specification. The 1N758A provides identical operating temperature range (175°C) and ROHS3 status. The BZX79 series (B10,113 and B10,133) offers extended operating temperature range (-65°C to 200°C) with ROHS3 compliance and ±2% tolerance matching the original part.

Category 2: Functional Equivalents with Alternative Packages

1N4104 (DO-7 package) and 1N4465 (DO-41 package) provide 10 V, 500 mW operation but require different board layouts due to package geometry changes. These are suitable only when board redesign is acceptable.

Category 3: Surface Mount Alternative

BZV55-B10,115 provides electrical equivalence but requires surface-mount assembly capability. This part is not suitable for through-hole applications.

Compliance-Based Selection:

For applications requiring ROHS3 compliance and automotive-grade reliability, 1N758A and BZX79-B10,113 are the primary alternatives. Both maintain the critical electrical parameters and compliance status of the original 1N5240C-TAP.

Frequently Asked Questions (FAQ)

Q: Can 1N5240B be used as a direct replacement for 1N5240C-TAP?

A: 1N5240B is mechanically and electrically compatible with identical DO-35 package and 500 mW power rating. The tolerance difference (±5% versus ±2%) and RoHS non-compliance status are the primary distinctions. Electrical performance is functionally equivalent for most applications.

Q: What is the difference between BZX79-B10,113 and BZX79-B10,133?

A: Both parts are electrically and mechanically identical with 10 V nominal voltage, ±2% tolerance, 400 mW power rating, and DO-35 package. The part number suffix indicates different manufacturing batches or packaging configurations from Nexperia USA Inc. Both are ROHS3 compliant and suitable for direct substitution.

Q: Why is 1N4465 listed as a substitute if it has higher power rating?

A: 1N4465 provides 1.5 W power dissipation capability, exceeding the 500 mW requirement. However, it uses DO-41 package instead of DO-35, requiring different board layout. It is functionally suitable but not a direct mechanical replacement.

Q: Can BZV55-B10,115 replace 1N5240C-TAP in existing designs?

A: BZV55-B10,115 is electrically equivalent with 10 V, 500 mW, ±2% tolerance. However, it is a surface-mount MINI-MELF package, not compatible with through-hole PCB designs. Board redesign is required for implementation.

Q: Which substitute offers the best compliance match to the original part?

A: 1N758A and BZX79-B10,113 both maintain ROHS3 compliance. 1N758A matches the original 175°C operating temperature. BZX79-B10,113 extends the operating range to -65°C to 200°C while maintaining ±2% tolerance and ROHS3 status.

Q: What is the impedance difference between 1N5240C-TAP and BZX79 series substitutes?

A: 1N5240C-TAP specifies 17 Ohms maximum impedance. BZX79 series parts specify 20 Ohms maximum impedance. This 3 Ohm difference is within acceptable tolerance for most circuit applications and does not prevent substitution.

Q: Are there inventory considerations for substitute selection?

A: Inventory levels vary significantly. BZV55-B10,115 (352,780 pcs), BZX79-B10,143 (175,804 pcs), and 1N5240BTR (40,764 pcs) show high availability. 1N758A (872 pcs) and BZX79-B10,133 (15,076 pcs) show lower stock levels. Availability should be confirmed with suppliers for production planning.

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