BZT52C18-13 Equivalent & Substitute Parts

Part Overview

The BZT52C18-13 is a Zener diode rated at 18 V nominal with 500 mW power dissipation in SOD-123 surface mount packaging, manufactured by Diodes Incorporated. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. Equivalent parts maintain identical electrical specifications, while substitute parts may vary in specific parameters within acceptable operating ranges for the intended application.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	18	V
Tolerance	±6%	—
Power - Max	500	mW
Impedance (Max)	45	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 12.6 V	—
Voltage - Forward (Max) @ If	900 mV @ 10 mA	—
Operating Temperature Range	-65°C to 150°C	—
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—

Substitute Part Grouping Explanation

Substitution of the BZT52C18-13 is determined by the following critical parameters: nominal Zener voltage (18 V), maximum power dissipation capability, impedance characteristics, reverse leakage current specifications, forward voltage drop, operating temperature range, and SOD-123 package compatibility. Parts are grouped into three categories based on their relationship to the original specification:

Parametric Equivalent: Parts maintaining all electrical specifications within the original tolerance and power rating.

Upgrade Category: Parts with reduced power rating (200 mW versus 500 mW) but identical voltage and package specifications.

Manufacturer Recommended Alternatives: Parts with improved specifications (tighter tolerance, lower impedance, or enhanced temperature range) or automotive-grade qualification, maintaining 18 V nominal voltage and 500 mW power rating in SOD-123 packaging.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vr Leakage	Temp Range	RoHS Status	Product Status
BZT52C18-13	Diodes Incorporated	18 V	±6%	500 mW	45 Ω	100 nA @ 12.6 V	-65°C to 150°C	Non-compliant	Discontinued
BZT52C18-7-F	Diodes Incorporated	18 V	±6%	500 mW	45 Ω	100 nA @ 12.6 V	-65°C to 150°C	ROHS3 Compliant	Active
BZT52C18-TP	Micro Commercial Co	18 V	±6%	200 mW	45 Ω	100 nA @ 12.6 V	-65°C to 150°C	ROHS3 Compliant	Active
CMHZ5248B TR PBFREE	Central Semiconductor Corp	18 V	±5%	500 mW	21 Ω	100 nA @ 14 V	-65°C to 150°C	ROHS3 Compliant	Active
MMSZ18ET1G	onsemi	18 V	±5%	500 mW	45 Ω	50 nA @ 12.6 V	-55°C to 150°C	ROHS3 Compliant	Active
MMSZ18T1G	onsemi	18 V	±5%	500 mW	45 Ω	50 nA @ 12.6 V	-55°C to 150°C	ROHS3 Compliant	Active
MMSZ4705T1G	onsemi	18 V	±5%	500 mW	—	50 nA @ 13.6 V	-55°C to 150°C	ROHS3 Compliant	Active
MMSZ5248B-TP	Micro Commercial Co	18 V	±5%	500 mW	21 Ω	100 nA @ 14 V	-55°C to 150°C	ROHS3 Compliant	Active
MMSZ5248BT1G	onsemi	18 V	±5%	500 mW	21 Ω	100 nA @ 14 V	-55°C to 150°C	ROHS3 Compliant	Active
SZMMSZ18T1G	onsemi	18 V	±5%	500 mW	45 Ω	50 nA @ 12.6 V	-55°C to 150°C	ROHS3 Compliant	Active
SZMMSZ4705T1G	onsemi	18 V	±5%	500 mW	—	50 nA @ 13.67 V	-55°C to 150°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

Direct Parametric Equivalent: BZT52C18-7-F from Diodes Incorporated is the direct parametric equivalent to BZT52C18-13, maintaining identical electrical specifications including ±6% tolerance, 500 mW power rating, 45 Ohm impedance, and -65°C to 150°C operating range. This part is currently active and ROHS3 compliant, with 193,270 units in stock.

Reduced Power Alternative: BZT52C18-TP from Micro Commercial Co provides an alternative for applications where 200 mW power dissipation is sufficient. This part maintains the 18 V nominal voltage and SOD-123 package but reduces maximum power to 200 mW.

Enhanced Specification Alternatives: CMHZ5248B TR PBFREE, MMSZ18ET1G, MMSZ18T1G, MMSZ4705T1G, MMSZ5248B-TP, MMSZ5248BT1G, SZMMSZ18T1G, and SZMMSZ4705T1G all provide improved specifications with tighter ±5% tolerance and lower reverse leakage current. These parts are ROHS3 compliant and active in production.

Automotive-Grade Options: SZMMSZ18T1G and SZMMSZ4705T1G are automotive-grade components qualified to AEC-Q101, suitable for applications requiring automotive reliability standards. These parts maintain 18 V nominal voltage and 500 mW power rating with -55°C to 150°C operating range.

Frequently Asked Questions (FAQ)

Q: Can BZT52C18-7-F directly replace BZT52C18-13 without circuit modification?

A: Yes. BZT52C18-7-F maintains identical electrical specifications: 18 V nominal Zener voltage, ±6% tolerance, 500 mW power dissipation, 45 Ohm impedance, and -65°C to 150°C operating temperature range. Both use SOD-123 surface mount packaging. The primary difference is product status and RoHS compliance.

Q: What is the difference between parts with ±6% and ±5% tolerance?

A: Tolerance specifies the allowable deviation from the nominal 18 V Zener voltage. ±6% tolerance allows deviation from 16.92 V to 19.08 V, while ±5% tolerance allows deviation from 17.1 V to 18.9 V. Applications requiring tighter voltage regulation benefit from ±5% tolerance parts.

Q: Can BZT52C18-TP be used in place of BZT52C18-13?

A: BZT52C18-TP is suitable only for applications where maximum power dissipation does not exceed 200 mW. The original BZT52C18-13 is rated for 500 mW. Using BZT52C18-TP in a 500 mW application will result in component failure.

Q: What is the significance of impedance (Zzt) differences between 45 Ohms and 21 Ohms?

A: Impedance affects the dynamic response of the Zener diode to changes in current. Lower impedance (21 Ohms) provides better voltage regulation under varying load conditions. Higher impedance (45 Ohms) is acceptable for applications with stable load conditions.

Q: Are automotive-grade parts (SZMMSZ18T1G, SZMMSZ4705T1G) required for all applications?

A: Automotive-grade parts with AEC-Q101 qualification are required only for automotive applications. Standard industrial-grade parts are suitable for consumer and general industrial applications.

Q: What is the difference between reverse leakage current specifications at different voltage points?

A: Reverse leakage current is measured at specific reverse voltages. Parts specify leakage at different voltages (12.6 V, 13.6 V, 13.67 V, or 14 V). Lower leakage current indicates better diode quality and reduced power loss in reverse bias conditions.

Q: Can parts with -55°C to 150°C temperature range replace parts with -65°C to 150°C range?

A: Parts with -55°C to 150°C range are suitable only for applications operating above -55°C. Applications requiring operation at -65°C must use parts with -65°C minimum temperature specification.

Q: What packaging options are available for these 18 V Zener diodes?

A: All listed parts use SOD-123 surface mount packaging. Packaging variations include Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and standard SOD-123 supplier device packages. Selection depends on procurement and assembly requirements.

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