1N5243C-TR Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5243C-TR is a 13 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in DO-35 (DO-204AH) axial through-hole package. This component is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, manufacturing discontinuation, or supply chain requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	13	V
Tolerance	±2%	-
Power - Maximum	500	mW
Impedance (Maximum)	13	Ohms
Current - Reverse Leakage @ Vr	500	nA @ 9.9 V
Voltage - Forward (Maximum) @ If	1.1	V @ 200 mA
Operating Temperature	175	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH (DO-35)	-
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitution of the 1N5243C-TR is determined by the following critical parameters: nominal Zener voltage (13 V), maximum power dissipation (500 mW or higher), package type (DO-35/DO-204AH through-hole), and mounting configuration (axial). Tolerance variations (±2% to ±5%) are acceptable within circuit design margins. Impedance differences and forward voltage variations are secondary considerations when primary electrical specifications align.

Substitute parts are grouped into two categories:

Category A: Direct Electrical Equivalents (500 mW Power Rating) Parts maintaining 500 mW maximum power dissipation with 13 V nominal Zener voltage and DO-35 package compatibility.

Category B: Functional Equivalents (400 mW Power Rating) Parts with reduced maximum power dissipation (400 mW) but identical 13 V nominal Zener voltage and compatible package geometry. These parts are suitable for applications where power dissipation does not exceed 400 mW.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	RoHS Status
1N5243C-TR	Vishay	13 V	±2%	500 mW	13 Ω	1.1 V @ 200 mA	-55 to 175°C	DO-35	ROHS3
1N5243B	Microchip	13 V	±5%	500 mW	13 Ω	1.5 V @ 200 mA	-65 to 175°C	DO-35	Non-compliant
1N5243BTR	Fairchild	13 V	±5%	500 mW	13 Ω	1.2 V @ 200 mA	-65 to 200°C	DO-35	Not specified
BZX79-B13,113	Nexperia	13 V	±2%	400 mW	30 Ω	0.9 V @ 10 mA	-65 to 200°C	DO-35	ROHS3
BZX79-B13,133	NXP	13 V	±2%	400 mW	30 Ω	0.9 V @ 10 mA	-65 to 200°C	DO-35	Not specified
BZX79C13-T50A	onsemi	13 V	±5%	500 mW	30 Ω	1.5 V @ 100 mA	-65 to 200°C	DO-35	ROHS3

Engineering Selection Recommendations

1N5243B (Microchip Technology) Electrical equivalent with 500 mW power rating and 13 V nominal Zener voltage. Tolerance specification is ±5% compared to ±2% of the primary part. RoHS non-compliant status requires verification against procurement requirements. Operating temperature range extends to -65°C, providing broader environmental coverage than the primary part.

1N5243BTR (Fairchild Semiconductor) Direct functional equivalent with 500 mW power rating, 13 V nominal Zener voltage, and extended operating temperature range to 200°C. Tolerance specification is ±5%. Forward voltage is 1.2 V @ 200 mA, intermediate between primary and alternative parts. RoHS compliance status not specified in available data.

BZX79-B13,113 (Nexperia USA Inc.) Functional equivalent with reduced power rating (400 mW) and identical 13 V nominal Zener voltage. Maintains ±2% tolerance matching the primary part. ROHS3 compliant. Maximum impedance is 30 Ω compared to 13 Ω of the primary part. Suitable for applications where power dissipation remains below 400 mW.

BZX79-B13,133 (NXP USA Inc.) Functional equivalent with 400 mW power rating and 13 V nominal Zener voltage. Maintains ±2% tolerance. Impedance specification is 30 Ω. Highest inventory availability (83,442 pcs). RoHS compliance status not specified.

BZX79C13-T50A (onsemi) Electrical equivalent with 500 mW power rating and 13 V nominal Zener voltage. ROHS3 compliant. Tolerance specification is ±5%. Maximum impedance is 30 Ω. Operating temperature range extends to 200°C. Forward voltage is 1.5 V @ 100 mA.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B13,113 or BZX79-B13,133 be used as direct replacements for 1N5243C-TR?

A: These parts are functionally compatible for applications where power dissipation does not exceed 400 mW. The 13 V nominal Zener voltage and DO-35 package are identical. However, the reduced power rating (400 mW vs. 500 mW) and increased impedance (30 Ω vs. 13 Ω) must be evaluated against circuit requirements.

Q: What is the significance of tolerance differences between ±2% and ±5%?

A: Tolerance specification defines the acceptable deviation range from the nominal 13 V Zener voltage. The 1N5243C-TR with ±2% tolerance provides tighter voltage regulation (12.74 V to 13.26 V) compared to ±5% parts (12.35 V to 13.65 V). Circuit design margins determine whether the wider tolerance is acceptable.

Q: Are all substitute parts available in the same packaging format?

A: All listed substitute parts use DO-35 (DO-204AH) axial through-hole package, ensuring mechanical compatibility. Packaging options (Tape & Reel, Bulk, Cut Tape) differ but do not affect electrical performance or board-level installation.

Q: Which substitute part offers the best compliance profile?

A: BZX79-B13,113 and BZX79C13-T50A both carry ROHS3 compliance certification matching the primary part. BZX79-B13,113 additionally maintains ±2% tolerance and automotive-grade specifications. BZX79C13-T50A provides 500 mW power rating with extended temperature range to 200°C.

Q: How do impedance differences affect circuit performance?

A: Impedance (Zzt) affects dynamic resistance and voltage regulation characteristics. The primary part specifies 13 Ω maximum impedance. Substitute parts BZX79-B13,113, BZX79-B13,133, and BZX79C13-T50A specify 30 Ω maximum impedance. Higher impedance results in reduced voltage regulation performance under varying load conditions.

Q: Is the 1N5243B suitable for automotive applications?

A: The 1N5243B lacks AEC-Q101 automotive qualification and carries RoHS non-compliant status. Use in automotive applications requires verification against specific procurement and compliance requirements.

Q: What is the impact of forward voltage variations among substitute parts?

A: Forward voltage (Vf) specifications range from 0.9 V to 1.5 V across substitute parts. These variations affect reverse-biased leakage characteristics and are secondary considerations for Zener diode operation. Forward voltage becomes relevant only in applications utilizing the diode in forward-biased mode.

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