1N6009B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N6009B is a 24 V, 500 mW Zener diode manufactured by onsemi in DO-35 through-hole package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement. The 1N6009B operates across a temperature range of -65°C to 200°C with ±5% voltage tolerance and is suitable for voltage regulation and protection applications requiring 24 V reference voltage.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	24	V
Power - Max	500	mW
Tolerance	±5%	-
Impedance (Max)	62	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 18 V	-
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	-
Operating Temperature	-65°C ~ 200°C	-
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-

Substitute Part Grouping Explanation

Substitution of the 1N6009B is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 24 V
Power - Max: 500 mW
Mounting Type: Through Hole
Package / Case: DO-35 (DO-204AH)

Secondary Compatibility Factors:

Tolerance: ±5% or tighter
Operating Temperature Range: Minimum -65°C to 175°C or higher
Impedance (Max): Electrical performance parameter
Current - Reverse Leakage: Leakage characteristics
Voltage - Forward (Vf): Forward conduction characteristics

Substitute parts are classified into two categories:

Direct Substitutes: Parts with identical or superior electrical specifications in the same DO-35 package, matching 24 V nominal voltage and 500 mW power rating.

Similar Substitutes: Parts with 24 V nominal voltage and 500 mW power rating in DO-35 package but with variations in tolerance, impedance, or temperature range. One higher-power alternative (1 W) in DO-41 package is included for applications where increased power dissipation capacity is beneficial.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Status
1N6009B	onsemi	24 V	±5%	500 mW	62 Ω	1.2 V @ 200 mA	-65°C ~ 200°C	DO-35	Obsolete
1N5252B	Microchip Technology	24 V	±5%	500 mW	33 Ω	1.5 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N3527A	Microchip Technology	24 V	±5%	500 mW	38 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N5252A (DO-35)	Microsemi Corporation	24 V	±10%	500 mW	33 Ω	1.5 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N5252B TR PBFREE	Central Semiconductor Corp	24 V	±5%	500 mW	33 Ω	1.1 V @ 200 mA	-65°C ~ 200°C	DO-35	Active
1N5745B	Microchip Technology	24 V	±5%	500 mW	70 Ω	900 mV @ 10 mA	-65°C ~ 175°C	DO-35	Active
1N6009A	Microchip Technology	24 V	±10%	500 mW	78 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N6009C	Microchip Technology	24 V	±2%	500 mW	62 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N6009D	Microchip Technology	24 V	±1%	500 mW	62 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N723A	Microchip Technology	24 V	±5%	250 mW	28 Ω	-	-	DO-35	Active
1N4749A	Lumimax Optoelectronic Technology	24 V	±5%	1 W	25 Ω	1.2 V @ 200 mA	-65°C ~ 200°C	DO-41	Active

Engineering Selection Recommendations

Direct Replacement (Preferred):

The 1N5252B TR PBFREE (Central Semiconductor Corp) is the primary direct substitute. It matches the 1N6009B in voltage (24 V), power rating (500 mW), tolerance (±5%), and package (DO-35). This part extends the operating temperature range to -65°C ~ 200°C, matching the original specification. The part is ROHS3 compliant and carries active product status.

Active Equivalent from Same Base Series:

The 1N6009 series from Microchip Technology provides multiple tolerance options:

1N6009A (±10% tolerance, active status)
1N6009C (±2% tolerance, active status)
1N6009D (±1% tolerance, active status)

These parts maintain the same 24 V, 500 mW specifications in DO-35 package with active product status. Selection depends on tolerance requirements for the application.

Alternative DO-35 Options:

The 1N5252B (Microchip Technology) and 1N3527A (Microchip Technology) are functionally equivalent in DO-35 package with 24 V, 500 mW ratings and ±5% tolerance. Both are active products. The 1N3527A exhibits lower forward voltage (1.1 V @ 200 mA) compared to the original specification (1.2 V @ 200 mA).

Higher Power Alternative:

The 1N4749A (Lumimax Optoelectronic Technology) provides 1 W power dissipation in DO-41 package with 24 V nominal voltage and ±5% tolerance. This part is RoHS compliant and operates across -65°C ~ 200°C. Selection of this part requires mechanical accommodation for the larger DO-41 package footprint.

Lower Power Alternative:

The 1N723A (Microchip Technology) operates at 250 mW power rating with 24 V nominal voltage and ±5% tolerance in DO-35 package. This part is suitable only for applications with reduced power dissipation requirements.

Frequently Asked Questions (FAQ)

Q: Can the 1N5252B directly replace the 1N6009B?

A: Yes. The 1N5252B matches the 1N6009B in nominal voltage (24 V), power rating (500 mW), tolerance (±5%), and package (DO-35). The 1N5252B is active product status and extends the upper operating temperature to 200°C, meeting or exceeding the original specification.

Q: What is the difference between 1N6009A, 1N6009C, and 1N6009D?

A: These parts differ in voltage tolerance: 1N6009A is ±10%, 1N6009C is ±2%, and 1N6009D is ±1%. All three maintain 24 V nominal voltage, 500 mW power rating, and DO-35 package. Selection depends on the tolerance requirement of the circuit design.

Q: Why is the 1N723A listed as a substitute if it has lower power rating?

A: The 1N723A is listed as a similar substitute for applications where power dissipation is not a limiting factor. It provides the same 24 V reference voltage in the same DO-35 package. Use this part only if circuit analysis confirms that 250 mW dissipation capacity is sufficient.

Q: Can I use the 1N4749A in place of the 1N6009B?

A: The 1N4749A is electrically compatible with 24 V nominal voltage and ±5% tolerance. However, it uses the DO-41 package instead of DO-35. Physical board layout changes are required to accommodate the larger package. The 1N4749A provides higher power dissipation (1 W) and is RoHS compliant.

Q: What does the "TR PBFREE" designation mean on the 1N5252B TR PBFREE?

A: "TR" indicates tape reel packaging format. "PBFREE" indicates lead-free (RoHS3 compliant) construction. This part is suitable for automated assembly processes and meets environmental compliance requirements.

Q: Are there temperature range differences between substitute options?

A: Yes. The 1N5252B TR PBFREE and 1N4749A operate to 200°C maximum, matching the 1N6009B. Most other substitutes (1N5252B, 1N3527A, 1N6009A, 1N6009C, 1N6009D) are rated to 175°C maximum. For applications requiring 200°C operation, select 1N5252B TR PBFREE or 1N4749A.

Q: What is the significance of impedance (Zzt) differences?

A: Impedance affects dynamic resistance and voltage regulation characteristics. Lower impedance (25-38 Ω) provides better voltage stability under load changes. Higher impedance (62-78 Ω) may result in greater voltage variation. Select based on circuit regulation requirements.

Q: Is RoHS compliance a factor in selecting a substitute?

A: RoHS compliance is relevant for applications subject to environmental regulations. The 1N5252B TR PBFREE is ROHS3 compliant. The 1N4749A is RoHS compliant. Most other substitutes are RoHS non-compliant. Verify compliance requirements for your application.

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