BZX55C13 A0G Equivalent & Substitute Parts

Part Overview

The BZX55C13 A0G is a Zener diode rated at 13 V nominal voltage with 500 mW power dissipation, manufactured by Taiwan Semiconductor Corporation. This through-hole component in DO-35 package is designed for voltage regulation and protection applications in electronic circuits. The part is currently Active in product status with RoHS3 compliance and REACH unaffected classification. Equivalent and substitute parts are identified to provide design flexibility, support supply chain alternatives, and accommodate varying inventory availability across manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	13	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	26	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 10 V
Voltage - Forward (Vf) (Max) @ If	1	V @ 100 mA
Operating Temperature Range	-55 to 175	°C
Mounting Type	Through Hole	-
Package / Case	DO-35 (DO-204AH)	-

Substitute Part Grouping Explanation

Substitution of the BZX55C13 A0G is determined by the following critical parameters: nominal Zener voltage (13 V), power rating (500 mW), tolerance (±5%), through-hole mounting configuration, and DO-35 package format. Parts are grouped into two categories based on these electrical and mechanical specifications:

Category 1: Direct Voltage Equivalents (13 V Zener) Parts maintaining the 13 V nominal Zener voltage specification with 500 mW power rating and ±5% tolerance in DO-35 package. These include 1N5243B, 1N5243BTR, and BZX79C13-T50A.

Category 2: Alternate Voltage Series (14 V Zener) Parts with 14 V nominal Zener voltage instead of 13 V, maintaining 500 mW power rating and ±5% tolerance in DO-35 package. These include 1N5244B and 1N5244BTR. These parts operate at a different voltage level and are suitable only for applications where 14 V regulation is acceptable.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	RoHS Status
BZX55C13 A0G	Taiwan Semiconductor Corporation	13 V	±5%	500 mW	26 Ω	100 nA @ 10 V	1 V @ 100 mA	-55 to 175°C	DO-35	ROHS3 Compliant
1N5243B	Microchip Technology	13 V	±5%	500 mW	13 Ω	500 nA @ 9.9 V	1.5 V @ 200 mA	-65 to 175°C	DO-35	RoHS non-compliant
1N5243BTR	Fairchild Semiconductor	13 V	±5%	500 mW	13 Ω	500 nA @ 9.9 V	1.2 V @ 200 mA	-65 to 200°C	DO-35	Not specified
1N5244B	Taiwan Semiconductor Corporation	14 V	±5%	500 mW	15 Ω	100 nA @ 10 V	1.1 V @ 200 mA	-55 to 200°C	DO-35	ROHS3 Compliant
1N5244BTR	Fairchild Semiconductor	14 V	±5%	500 mW	15 Ω	100 nA @ 10 V	1.2 V @ 200 mA	-65 to 200°C	DO-35	Not specified
BZX79C13-T50A	onsemi	13 V	±5%	500 mW	30 Ω	100 nA @ 8 V	1.5 V @ 100 mA	-65 to 200°C	DO-35	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Voltage Replacement (13 V Applications):

1N5243BTR (Fairchild Semiconductor) provides the most compatible electrical characteristics with extended temperature range (-65 to 200°C) and improved forward voltage specification (1.2 V @ 200 mA). This part is suitable for applications requiring the original 13 V regulation voltage.

BZX79C13-T50A (onsemi) maintains RoHS3 compliance and offers extended operating temperature range (-65 to 200°C). This part is appropriate for applications with stringent environmental specifications.

1N5243B (Microchip Technology) is available in high inventory quantity (3100 pcs) but carries RoHS non-compliance status. Selection of this part requires verification of end-product compliance requirements.

For Alternate Voltage Applications (14 V Regulation):

1N5244BTR (Fairchild Semiconductor) provides extended temperature range (-65 to 200°C) and is suitable for 14 V regulation applications where the higher voltage is acceptable.

1N5244B (Taiwan Semiconductor Corporation) maintains RoHS3 compliance and is available in high inventory (9465 pcs), making it suitable for high-volume applications requiring 14 V regulation.

Compliance Considerations:

The original BZX55C13 A0G carries RoHS3 compliance. When substituting with 1N5243B, verify that end-product RoHS compliance requirements are met, as this part is RoHS non-compliant. Parts 1N5244B and BZX79C13-T50A maintain RoHS3 compliance status.

Frequently Asked Questions (FAQ)

Q: Can 1N5244B or 1N5244BTR be used as direct replacements for BZX55C13 A0G?

A: No. The 1N5244B and 1N5244BTR are rated at 14 V nominal Zener voltage, while the BZX55C13 A0G is rated at 13 V. These parts are suitable only for applications where 14 V regulation voltage is specified. Direct substitution in 13 V circuits will result in incorrect voltage regulation.

Q: What is the difference between 1N5243B and 1N5243BTR?

A: Both parts share identical electrical specifications (13 V, 500 mW, ±5% tolerance, DO-35 package). The primary difference is packaging format: 1N5243B is supplied in bulk packaging, while 1N5243BTR is supplied in tape and reel format. The tape and reel format (1N5243BTR) is typically used for automated assembly processes.

Q: Are there temperature range limitations when substituting with 1N5243B?

A: The 1N5243B operates over -65 to 175°C, which is narrower than the BZX55C13 A0G range of -55 to 175°C at the lower end. For applications operating below -55°C, the 1N5243B is not suitable. Alternative parts such as 1N5243BTR or BZX79C13-T50A, which operate to -65°C, are appropriate for extended low-temperature applications.

Q: Does impedance variation affect circuit performance when substituting parts?

A: Impedance values vary across substitute parts (ranging from 13 to 30 Ohms maximum). Impedance affects transient response and noise filtering characteristics. For applications with strict impedance requirements, verify that the selected substitute part's impedance specification is acceptable for the circuit design.

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

A: Reverse leakage current varies across parts (100 nA to 500 nA at different voltage points). Higher leakage current increases power dissipation in standby conditions. For low-power or battery-operated applications, parts with lower reverse leakage (100 nA specification) such as BZX55C13 A0G, 1N5244B, 1N5244BTR, and BZX79C13-T50A are preferred.

Q: Is the DO-35 package compatible across all listed substitute parts?

A: Yes. All listed substitute parts use the DO-35 (DO-204AH) package format with through-hole mounting. Physical and electrical compatibility with existing PCB layouts and through-hole assembly processes is maintained across all parts.

Q: What packaging options are available for the substitute parts?

A: Substitute parts are available in multiple packaging formats: bulk packaging (1N5243B, 1N5243BTR, 1N5244BTR), tape and reel format (1N5244B), and cut tape format (BZX79C13-T50A). Selection depends on assembly process requirements and inventory management practices.

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