1N5230B-T Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5230B-T is a 4.7 V zener diode rated at 500 mW in a DO-35 through-hole package, manufactured by Diodes Incorporated. This component is classified as obsolete, indicating that direct replacements from the original manufacturer are no longer in production. Equivalent and substitute parts are necessary to maintain circuit functionality and ensure continued availability for repair, maintenance, and new design implementations.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	4.7 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	19 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	1.1 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 1N5230B-T is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 4.7 V nominal
Tolerance: ±5% (allows substitution with ±5% or tighter tolerance)
Power rating: 500 mW minimum
Package: DO-35 through-hole axial configuration
Impedance: 19 Ohms maximum
Reverse leakage: 5 µA @ 2 V maximum
Forward voltage: 1.1 V @ 200 mA maximum
Operating temperature range: -65°C to 200°C minimum

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (All Parameters Match) Parts that meet or exceed all electrical specifications and maintain identical operating temperature ranges and impedance characteristics.

Category 2: Functional Equivalents (Core Parameters Match with Minor Deviations) Parts that maintain the 4.7 V zener voltage, 500 mW power rating, and DO-35 package but may have variations in reverse leakage current, forward voltage, or maximum operating temperature that do not compromise circuit functionality within the original design parameters.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	Status
1N5230B-T	Diodes Incorporated	4.7 V	±5%	500 mW	19 Ω	5 µA @ 2 V	1.1 V @ 200 mA	-65°C ~ 200°C	DO-35	Obsolete
1N5230B BK TIN/LEAD	Central Semiconductor Corp	4.7 V	±5%	500 mW	19 Ω	5 µA @ 2 V	1.1 V @ 200 mA	-65°C ~ 200°C	DO-35	Active
1N5230BDO35	Microsemi Corporation	4.7 V	±5%	500 mW	19 Ω	50 µA @ 2 V	1.5 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N750A BK PBFREE	Central Semiconductor Corp	4.7 V	±5%	500 mW	19 Ω	2 µA @ 1 V	1.5 V @ 200 mA	-65°C ~ 200°C	DO-35	Active
1N3510A	Microchip Technology	4.7 V	±5%	500 mW	16 Ω	Not specified	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N5230A	Microchip Technology	4.7 V	±10%	500 mW	19 Ω	50 µA @ 1.9 V	1.5 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N5230A (DO-35)	Microsemi Corporation	4.7 V	±10%	500 mW	19 Ω	50 µA @ 1.9 V	1.5 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N5230B	Microchip Technology	4.7 V	±5%	500 mW	19 Ω	50 µA @ 2 V	1.5 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N4624 TR PBFREE	Central Semiconductor Corp	4.7 V	±5%	250 mW	1550 Ω	10 µA @ 3 V	1 V @ 200 mA	-65°C ~ 200°C	DO-35	Active
1N4624-1	Microchip Technology	4.7 V	±5%	500 mW	1550 Ω	5 µA @ 3 V	1.1 V @ 200 mA	-65°C ~ 175°C	DO-7	Active

Engineering Selection Recommendations

Tier 1: Direct Substitutes (Recommended for Direct Replacement)

1N5230B BK TIN/LEAD (Central Semiconductor Corp) This part provides identical electrical specifications to the original 1N5230B-T across all measured parameters. It maintains the same 4.7 V nominal zener voltage, ±5% tolerance, 500 mW power rating, 19 Ohm impedance, and -65°C to 200°C operating temperature range. The part is currently in active production status with 1092 units in stock. Note: RoHS non-compliant status differs from the original part.

1N750A BK PBFREE (Central Semiconductor Corp) This part meets all core electrical requirements with identical zener voltage, tolerance, power rating, and impedance specifications. It offers superior reverse leakage characteristics (2 µA @ 1 V versus 5 µA @ 2 V) and maintains the full -65°C to 200°C operating temperature range. The part is ROHS3 compliant and currently in active production with 10879 units in stock, providing excellent availability.

Tier 2: Functional Equivalents (Acceptable for Most Applications)

1N5230B (Microchip Technology) This part maintains the 4.7 V nominal voltage, ±5% tolerance, and 500 mW power rating. Operating temperature range is reduced to -65°C to 175°C. Reverse leakage is specified at 50 µA @ 2 V and forward voltage at 1.5 V @ 200 mA, representing minor deviations from the original specification. The part is currently in active production with 1206 units in stock.

1N3510A (Microchip Technology) This part maintains the 4.7 V nominal voltage, ±5% tolerance, and 500 mW power rating with improved impedance specification (16 Ohms maximum). Operating temperature range is -65°C to 175°C. Forward voltage specification matches the original at 1.1 V @ 200 mA. The part is currently in active production with 928 units in stock.

1N5230BDO35 (Microsemi Corporation) This part maintains the 4.7 V nominal voltage, ±5% tolerance, and 500 mW power rating. Operating temperature range is -65°C to 175°C. Reverse leakage is specified at 50 µA @ 2 V and forward voltage at 1.5 V @ 200 mA. The part is ROHS3 compliant and currently in active production with 1039 units in stock.

Tier 3: Reduced Power Rating (Limited Application)

1N4624 TR PBFREE (Central Semiconductor Corp) This part maintains the 4.7 V nominal voltage and ±5% tolerance but is rated at 250 mW power dissipation, representing a 50% reduction from the original 500 mW specification. This part is suitable only for applications where the circuit power requirements do not exceed 250 mW. The part is currently in active production with 6577 units in stock.

Tier 4: Alternate Package (Package Change Required)

1N4624-1 (Microchip Technology) This part maintains the 4.7 V nominal voltage, ±5% tolerance, and 500 mW power rating but uses a DO-7 package instead of the DO-35 package. This substitution requires physical board layout modification and is suitable only when package change is acceptable. The part is currently in active production with 1031 units in stock.

Tier 5: Relaxed Tolerance (Acceptable for Non-Critical Applications)

1N5230A (Microchip Technology and Microsemi Corporation) These parts maintain the 4.7 V nominal voltage and 500 mW power rating but specify ±10% tolerance instead of ±5%. This relaxed tolerance is acceptable for applications where voltage regulation precision is not critical. Both manufacturers offer active production status with 664 and 627 units in stock respectively.

Frequently Asked Questions (FAQ)

Q: Can I use 1N750A BK PBFREE as a direct replacement for 1N5230B-T?

A: Yes. The 1N750A BK PBFREE maintains identical zener voltage (4.7 V), tolerance (±5%), power rating (500 mW), and impedance (19 Ohms) specifications. It provides superior reverse leakage performance and extends the operating temperature range to the full -65°C to 200°C specification. The part is ROHS3 compliant and currently in active production.

Q: What is the difference between 1N5230B and 1N5230A?

A: The primary difference is tolerance specification. The 1N5230B maintains ±5% tolerance while the 1N5230A specifies ±10% tolerance. Both parts maintain the 4.7 V nominal zener voltage and 500 mW power rating. The 1N5230A is suitable for applications where tighter voltage regulation is not required.

Q: Can I substitute 1N4624 TR PBFREE for 1N5230B-T?

A: The 1N4624 TR PBFREE maintains the 4.7 V nominal voltage and ±5% tolerance but is rated at 250 mW power dissipation. This part is suitable only if your circuit power requirements do not exceed 250 mW. If your circuit requires 500 mW dissipation capability, this substitution is not appropriate.

Q: Why does 1N4624-1 have a different package designation?

A: The 1N4624-1 uses a DO-7 package instead of the DO-35 package. While both are through-hole axial packages, they have different physical dimensions. This substitution requires board layout modification and is suitable only when package change is acceptable to your design.

Q: What does RoHS compliance mean for zener diode selection?

A: RoHS (Restriction of Hazardous Substances) compliance indicates the part does not contain restricted materials such as lead, mercury, or cadmium. ROHS3 compliant parts meet current regulatory requirements. If your application requires RoHS compliance, select parts with ROHS3 status such as 1N750A BK PBFREE or 1N5230BDO35.

Q: How do I determine which substitute part is best for my application?

A: Evaluate your circuit requirements against the following parameters in order of priority: (1) Zener voltage and tolerance, (2) Power dissipation requirement, (3) Package type, (4) Operating temperature range, (5) Compliance requirements (RoHS, REACH). Select the lowest-tier substitute that meets all your requirements.

Q: What is the significance of reverse leakage current specification?

A: Reverse leakage current indicates the small current that flows through the zener diode when it is reverse-biased below the zener voltage. Lower reverse leakage (such as 2 µA in 1N750A BK PBFREE) indicates better performance in precision voltage regulation applications. Higher reverse leakage (such as 50 µA in some alternatives) is acceptable for general-purpose applications.

Q: Can I use parts with different operating temperature ranges?

A: Yes, if your circuit operates within the reduced temperature range. For example, if your circuit operates between -40°C and 85°C, you can use parts rated for -65°C to 175°C. However, if your circuit requires operation at 200°C, you must select parts with the extended temperature range such as 1N5230B-T or 1N750A BK PBFREE.

Q: What does impedance (Zzt) specification mean?

A: Impedance represents the dynamic resistance of the zener diode in the breakdown region. Lower impedance (such as 16-19 Ohms) indicates better voltage regulation performance with less voltage variation across different load currents. Higher impedance (such as 1550 Ohms in 1N4624 series) indicates reduced regulation performance but may be acceptable for non-critical applications.

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