1N4740A_S00Z Equivalent & Substitute Parts

Part Overview

The 1N4740A_S00Z is a Zener diode rated at 10 V nominal voltage with 1 W maximum power dissipation in a through-hole DO-41 axial package. Manufactured by onsemi, this component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. The part maintains ±5% voltage tolerance and operates across a temperature range of -65°C to 200°C.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	10 V
Power - Max	1 W
Tolerance	±5%
Impedance (Max)	7 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 7.6 V
Operating Temperature Range	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial

Substitute Part Grouping Explanation

Substitute parts for the 1N4740A_S00Z are identified based on strict electrical and mechanical parameter equivalence. The primary selection criteria are:

Electrical Parameters:

Zener voltage: 10 V nominal
Power rating: 1 W maximum
Voltage tolerance: ±5%
Impedance: 7 Ohms maximum
Operating temperature range: -65°C to 200°C

Mechanical Parameters:

Mounting type: Through Hole
Package designation: DO-41 or DO-204AL (equivalent designations)

Parts meeting these specifications are classified as direct electrical and mechanical equivalents. Variations in reverse leakage current, forward voltage characteristics, or packaging format (tape & reel versus individual units) do not preclude substitution when the core electrical ratings and physical mounting requirements are identical.

Parameter Comparison

Parameter	1N4740A_S00Z (Main)	1N4740A (Lumimax)	BZX85C10TR5K (onsemi)
Manufacturer	onsemi	Lumimax Optoelectronic Technology	onsemi
Voltage - Zener (Nom)	10 V	10 V	10 V
Power - Max	1 W	1 W	1 W
Tolerance	±5%	±5%	±5%
Impedance (Max)	7 Ohms	7 Ohms	7 Ohms
Operating Temperature	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	RoHS Compliant	ROHS3 Compliant

Engineering Selection Recommendations

1N4740A (Lumimax Optoelectronic Technology)

This substitute maintains identical electrical specifications and through-hole DO-41 package configuration. The part is currently in active production status with RoHS compliance certification. Inventory availability is substantial at 16,094 units. This option provides direct form-fit-function compatibility with the obsolete 1N4740A_S00Z.

BZX85C10TR5K (onsemi)

This parametric equivalent from the original manufacturer onsemi provides identical electrical ratings and package specifications. The part is supplied in tape & reel format (5,000-unit reels) and maintains active production status with ROHS3 compliance. Inventory availability exceeds 950,000 units. The BZX85C10 series represents the current production equivalent to the legacy 1N4740A designation. This option is suitable for high-volume applications requiring reel packaging.

Both substitute parts satisfy the electrical and mechanical requirements of the 1N4740A_S00Z. Selection between them depends on packaging format requirements (individual units versus tape & reel) and supply chain preferences.

Frequently Asked Questions (FAQ)

Q: Can the 1N4740A from Lumimax be used as a direct replacement for the onsemi 1N4740A_S00Z?

A: Yes. Both parts share identical zener voltage (10 V), power rating (1 W), tolerance (±5%), impedance (7 Ohms maximum), and operating temperature range (-65°C to 200°C). Both utilize through-hole DO-41 axial packaging. The Lumimax part is in active production, whereas the onsemi 1N4740A_S00Z is obsolete.

Q: What is the difference between the 1N4740A and BZX85C10TR5K?

A: Both parts are electrically equivalent with identical zener voltage, power rating, tolerance, and impedance specifications. The primary difference is packaging format: the 1N4740A is supplied as individual units, while the BZX85C10TR5K is supplied in tape & reel format. The BZX85C10 designation represents onsemi's current production series for this voltage and power class.

Q: Are there any compliance differences between the substitute parts?

A: The Lumimax 1N4740A carries RoHS Compliant certification. The onsemi BZX85C10TR5K carries ROHS3 Compliant certification, representing a more recent compliance standard. Both parts are REACH Unaffected or have REACH information available upon request.

Q: Can the BZX85C10TR5K be used in applications requiring individual component placement?

A: The BZX85C10TR5K is supplied in tape & reel format for automated assembly. For manual or individual component placement, the 1N4740A from Lumimax is the appropriate selection, as it is supplied as discrete units in standard packaging.

Q: Are the reverse leakage current specifications identical across all three parts?

A: The 1N4740A_S00Z and 1N4740A (Lumimax) specify 10 µA @ 7.6 V. The BZX85C10TR5K specifies 500 nA @ 7 V. Both values are within acceptable operating parameters for 10 V, 1 W zener diodes and do not affect substitution eligibility based on the core electrical ratings.

Q: What is the operating temperature range for all substitute parts?

A: All three parts operate across -65°C to 200°C (junction temperature). This range is identical across the main part and both substitutes.

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