1N4626-1 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4626-1 is a 5.6 V Zener diode rated at 500 mW, manufactured by Microchip Technology in a DO-7 (DO-204AA) axial through-hole package. This component is classified as Active and maintains full operational status. Substitute parts are necessary when the original part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when higher power ratings are needed for circuit redesign without changing the core voltage regulation function.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	5.6	V
Tolerance	±5	%
Power - Maximum	500	mW
Impedance (Maximum)	1400	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 5.2 V
Voltage - Forward (Maximum) @ If	1.1	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AA, DO-7, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N4626-1 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Zener voltage (Nominal): 5.6 V (fixed requirement)
Tolerance: ±5% (fixed requirement)
Mounting type: Through Hole (fixed requirement)
Package style: Axial configuration (fixed requirement)

Allowable Variations:

Power rating: May be equal to or greater than 500 mW
Impedance: May be lower than 1400 Ohms (lower impedance indicates better regulation)
Reverse leakage current: May be higher than 1 µA
Operating temperature range: May be equal to or greater than -65°C to 175°C
Forward voltage: May vary within manufacturer specifications

All substitute parts listed maintain the 5.6 V nominal zener voltage and ±5% tolerance, ensuring functional equivalence in voltage regulation circuits. Substitute parts with higher power ratings (1 W) provide enhanced thermal capability and are electrically compatible with circuits designed for the 500 mW original part.

Parameter Comparison

Parameter	1N4626-1 (Main)	1N4734A	1N4734A-T50A	1N4734A-T50R
Manufacturer	Microchip Technology	Microsemi Corporation	onsemi	onsemi
Voltage - Zener (Nom)	5.6 V	5.6 V	5.6 V	5.6 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	500 mW	1 W	1 W	1 W
Impedance (Max)	1400 Ohms	5 Ohms	5 Ohms	5 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 5.2 V	10 µA @ 2 V	10 µA @ 2 V	10 µA @ 2 V
Operating Temperature	-65°C ~ 175°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AA, DO-7	DO-204AL, DO-41	DO-204AL, DO-41	DO-204AL, DO-41
Product Status	Active	Active	Active	Obsolete
RoHS Status	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: 1N4734A-T50A

The 1N4734A-T50A is the recommended substitute for new designs and production applications. This part maintains electrical equivalence with the 1N4626-1 through identical zener voltage (5.6 V) and tolerance (±5%). The 1N4734A-T50A offers superior characteristics: doubled power rating (1 W versus 500 mW), significantly lower impedance (5 Ohms versus 1400 Ohms), and extended operating temperature range (-65°C to 200°C). The part is ROHS3 compliant, meeting current environmental regulations. Product status is Active, ensuring long-term availability. Packaging is supplied in Cut Tape (CT) format, suitable for automated assembly processes.

Secondary Substitute: 1N4734A

The 1N4734A (Microsemi Corporation) provides electrical equivalence and identical power rating upgrade (1 W) with lower impedance (5 Ohms). This part maintains Active product status. RoHS compliance status is non-compliant, matching the original 1N4626-1. This option is suitable for legacy system maintenance or when Microsemi sourcing is preferred.

Obsolete Alternative: 1N4734A-T50R

The 1N4734A-T50R is classified as Obsolete and should not be selected for new designs or long-term production applications. While electrically equivalent and ROHS3 compliant, obsolete status indicates limited future availability. This part may be considered only for repair of existing equipment where original part sourcing is exhausted.

Frequently Asked Questions (FAQ)

Q: Can the 1N4734A series parts directly replace the 1N4626-1 in existing circuits?

A: Yes. All listed substitute parts maintain the 5.6 V nominal zener voltage and ±5% tolerance, which are the primary electrical parameters determining zener diode function. The substitute parts are electrically compatible with circuits designed for the 1N4626-1. The higher power rating (1 W versus 500 mW) and lower impedance (5 Ohms versus 1400 Ohms) of the 1N4734A series represent improvements that do not compromise circuit operation.

Q: What is the difference between DO-7 and DO-41 packages?

A: Both are axial through-hole packages for zener diodes. DO-7 (DO-204AA) and DO-41 (DO-204AL) are physically similar configurations with leads extending from opposite ends of the component body. Both are suitable for through-hole PCB assembly. Package selection depends on PCB layout and lead spacing requirements. Mechanical compatibility should be verified against specific PCB footprint specifications.

Q: Why does the 1N4734A have lower impedance than the 1N4626-1?

A: Impedance is a characteristic of the diode's internal structure and manufacturing process. Lower impedance (5 Ohms versus 1400 Ohms) in the 1N4734A indicates superior voltage regulation performance, as the diode maintains more stable voltage across varying load currents. This is a beneficial characteristic for voltage regulation applications.

Q: Is the 1N4734A-T50R suitable for new production?

A: No. The 1N4734A-T50R is classified as Obsolete, indicating that the manufacturer has discontinued production. New designs should use the 1N4734A-T50A, which is Active and ROHS3 compliant. Obsolete parts should be reserved for repair and maintenance of existing equipment only.

Q: What does ROHS3 compliance mean for the 1N4734A-T50A?

A: ROHS3 compliance indicates that the part meets the Restriction of Hazardous Substances Directive 3, which restricts the use of specific hazardous materials in electrical and electronic equipment. This certification is required for products sold in the European Union and many other markets. The original 1N4626-1 is RoHS non-compliant, while the 1N4734A-T50A is ROHS3 compliant, making it suitable for applications with environmental regulatory requirements.

Q: Can I use the 1N4734A in place of the 1N4626-1 if my circuit is already in production?

A: Yes, provided that PCB footprint compatibility is confirmed. Both parts are through-hole axial diodes and are mechanically compatible with standard through-hole assembly processes. The electrical parameters are compatible. Verify that the PCB layout accommodates the DO-41 package dimensions if transitioning from DO-7.

Q: What is the significance of the ±5% tolerance specification?

A: The ±5% tolerance indicates the maximum deviation of the actual zener voltage from the nominal 5.6 V specification. All listed substitute parts maintain this tolerance, ensuring that voltage regulation performance remains within design specifications. This tolerance is critical for circuits requiring precise voltage reference or protection functions.

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