1N5992B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5992B is a 4.7 V zener diode rated at 500 mW with ±5% tolerance, manufactured by onsemi in a through-hole DO-35 package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 1N5992B functions as a voltage regulator and protective element in electronic circuits requiring stable 4.7 V reference voltage regulation.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.7	V
Tolerance	±5%	-
Power - Max	500	mW
Impedance (Max)	70	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 1.5 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature	-65 to 200	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-

Substitute Part Grouping Explanation

Substitution of the 1N5992B is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 4.7 V (exact match required)
Tolerance: ±5% or tighter (±5%, ±2%, ±1% acceptable; ±10%, ±20% not acceptable for direct substitution)
Power - Max: 500 mW (minimum requirement)
Mounting Type: Through Hole
Package / Case: DO-35 or DO-204AH compatible

Secondary Compatibility Factors:

Impedance (Max): 70 Ohms or lower preferred for voltage regulation stability
Current - Reverse Leakage: Lower values preferred for circuit performance
Voltage - Forward (Vf): Compatibility with 200 mA forward current operation
Operating Temperature Range: Must encompass application requirements

Substitute parts are classified into two categories:

Direct Substitutes (Electrical and Mechanical Equivalence): Parts matching all primary criteria with ±5% tolerance and 500 mW power rating in DO-35 package.

Similar Substitutes (Functional Equivalence with Parameter Variations): Parts with matching zener voltage and power rating but differing in tolerance, impedance, or package size. These require circuit-level evaluation for compatibility.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ 200mA (V)	Package	Status
1N5992B	onsemi	4.7	±5%	500	70	1.2	DO-35	Obsolete
1N5230B	Microchip Technology	4.7	±5%	500	19	1.5	DO-35	Active
1N750A TR PBFREE	Central Semiconductor Corp	4.7	±5%	500	19	1.5	DO-35	Active
BZX79C4V7	Taiwan Semiconductor Corporation	4.7	±5%	500	80	1.5	DO-35	Active
1N5522B (DO35)	Microsemi Corporation	4.7	±5%	500	22	1.1	DO-35	Active
1N5992C	Microchip Technology	4.7	±2%	500	70	1.1	DO-35	Active
1N5992D	Microchip Technology	4.7	±1%	500	70	1.1	DO-35	Active
1N5230A (DO-35)	Microsemi Corporation	4.7	±10%	500	19	1.5	DO-35	Active
1N5992	Microchip Technology	4.7	±20%	500	90	1.1	DO-35	Active
1N4732A	Microchip Technology	4.7	±5%	1000	8	1.2	DO-41	Active

Engineering Selection Recommendations

Recommended Direct Substitutes (Highest Compatibility):

1N5230B (Microchip Technology) - Active product status. Matches all primary electrical parameters with ±5% tolerance and 500 mW power rating. Lower impedance (19 Ohms) provides improved voltage regulation stability. DO-35 package compatibility confirmed. RoHS non-compliant status matches original part classification.
1N750A TR PBFREE (Central Semiconductor Corp) - Active product status. Electrical equivalence with ±5% tolerance and 500 mW rating. RoHS3 compliant with extended operating temperature range (-65°C to 200°C) matching original specification. Lower impedance (19 Ohms) enhances regulation performance. Cut tape packaging available.
BZX79C4V7 (Taiwan Semiconductor Corporation) - Active product status. Meets all primary criteria with ±5% tolerance and 500 mW power rating. RoHS3 compliant. Impedance (80 Ohms) closely matches original 1N5992B specification. Tape & Reel packaging available.

Acceptable Substitutes (Functional Equivalence with Tolerance Variations):

1N5522B (DO35) (Microsemi Corporation) - Active product status. Electrical match with ±5% tolerance and 500 mW rating. Lower impedance (22 Ohms) and forward voltage (1.1 V @ 200 mA) provide circuit performance improvements. Operating temperature range (-65°C to 175°C) slightly reduced from original.
1N5992C (Microchip Technology) - Active product status. Tighter tolerance (±2%) than original ±5%, providing enhanced voltage regulation precision. Identical impedance (70 Ohms) and power rating. Operating temperature range (-65°C to 175°C) reduced from original 200°C maximum.
1N5992D (Microchip Technology) - Active product status. Tightest tolerance (±1%) available among substitutes. Identical impedance (70 Ohms) and power rating. Suitable for applications requiring superior voltage accuracy. Operating temperature range (-65°C to 175°C) reduced from original.

Limited Substitutes (Parameter Deviations Requiring Evaluation):

1N5230A (DO-35) (Microsemi Corporation) - Active product status. Tolerance specification (±10%) exceeds acceptable deviation from original ±5%. Suitable only for applications with relaxed voltage regulation requirements. Lower impedance (19 Ohms) beneficial for regulation.
1N5992 (Microchip Technology) - Active product status. Tolerance specification (±20%) significantly exceeds acceptable deviation. Higher impedance (90 Ohms) degrades voltage regulation performance. Not recommended for direct substitution without circuit redesign evaluation.

Higher Power Alternative (Package Change Required):

1N4732A (Microchip Technology) - Active product status. Doubled power rating (1 W vs. 500 mW) with ±5% tolerance and 4.7 V zener voltage. DO-41 package requires mechanical redesign. Lower impedance (8 Ohms) provides superior regulation. Suitable for applications requiring increased thermal dissipation capability.

Frequently Asked Questions (FAQ)

Q: Can 1N5230B directly replace 1N5992B without circuit modification?

A: Yes. The 1N5230B matches all critical electrical parameters: 4.7 V zener voltage, ±5% tolerance, 500 mW power rating, and DO-35 package. Lower impedance (19 Ohms vs. 70 Ohms) improves voltage regulation stability without requiring circuit changes. Both parts are through-hole axial components with identical mechanical compatibility.

Q: What is the difference between 1N5992B, 1N5992C, and 1N5992D?

A: All three parts share identical zener voltage (4.7 V), power rating (500 mW), impedance (70 Ohms), and DO-35 package. The primary difference is tolerance specification: 1N5992B (±5%), 1N5992C (±2%), and 1N5992D (±1%). Tighter tolerance parts provide enhanced voltage regulation accuracy. Operating temperature range differs: 1N5992B (-65°C to 200°C) versus 1N5992C and 1N5992D (-65°C to 175°C).

Q: Is BZX79C4V7 compatible with 1N5992B applications?

A: Yes. The BZX79C4V7 provides electrical equivalence with matching 4.7 V zener voltage, ±5% tolerance, and 500 mW power rating in DO-35 package. Impedance (80 Ohms) closely matches the original specification (70 Ohms). RoHS3 compliance offers regulatory advantage. Operating temperature range (-65°C to 175°C) is slightly reduced from the original 200°C maximum.

Q: Why does 1N4732A have different package designation (DO-41)?

A: The 1N4732A is a higher power zener diode (1 W vs. 500 mW) requiring larger physical dimensions for thermal dissipation. The DO-41 package is physically larger than DO-35, necessitating PCB layout modifications. This part is suitable only for applications requiring increased power handling capability and where mechanical redesign is feasible.

Q: What does impedance (Zzt) mean in zener diode selection?

A: Impedance (Zzt) represents the dynamic impedance of the zener diode in its regulation region. Lower impedance values indicate better voltage regulation stability and reduced output voltage variation under load changes. The 1N5992B specifies 70 Ohms maximum impedance. Substitute parts with lower impedance (such as 1N5230B at 19 Ohms) provide improved regulation performance.

Q: Can 1N5230A (±10% tolerance) replace 1N5992B (±5% tolerance)?

A: The 1N5230A is not recommended as a direct substitute due to wider tolerance specification (±10% vs. ±5%). This tolerance deviation may exceed acceptable voltage regulation limits in precision applications. The 1N5230A is suitable only for applications with relaxed voltage accuracy requirements where ±10% deviation is acceptable.

Q: What is the significance of RoHS compliance in substitute selection?

A: RoHS compliance indicates lead-free manufacturing and absence of restricted hazardous substances. The original 1N5992B is RoHS non-compliant (lead-containing). Substitute parts such as 1N750A TR PBFREE and BZX79C4V7 offer RoHS3 compliance, providing environmental and regulatory advantages for new designs. Non-compliant substitutes (1N5230B, 1N5522B) maintain compatibility with legacy systems.

Q: Are cut tape (CT) and tape & reel (TR) packaging interchangeable?

A: Cut tape and tape & reel packaging contain identical components with different presentation formats. Cut tape is supplied in individual strips suitable for manual assembly or small-quantity applications. Tape & reel packaging is optimized for automated pick-and-place assembly in high-volume production. Electrical and mechanical specifications remain identical; packaging selection depends on assembly process requirements.

Q: What operating temperature range should be considered for substitute selection?

A: The original 1N5992B specifies -65°C to 200°C operating range. Most substitute parts (1N5230B, 1N5992C, 1N5992D, 1N5522B) limit maximum temperature to 175°C. Applications requiring full 200°C operation should specify 1N750A TR PBFREE, which maintains the extended upper temperature limit. Temperature range reduction may be acceptable for applications operating within -65°C to 175°C envelope.

Q: How does forward voltage (Vf) affect circuit design?

A: Forward voltage (Vf) specifies the voltage drop across the zener diode when conducting in forward direction at specified current (typically 200 mA). The 1N5992B specifies 1.2 V maximum at 200 mA. Substitute parts vary from 1.1 V to 1.5 V at this current level. Variations within this range typically do not require circuit redesign but should be verified in applications with tight voltage margin specifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message