PZM18NB,115 Equivalent & Substitute Zener Diodes Reference

Part Overview

The PZM18NB,115 is an NXP USA Inc. Zener diode rated at 18 V, 300 mW for surface mount applications, supplied in a TO-236-3, SC-59, and SMT3 (MPAK) package. The part is obsolete, making it necessary to identify equivalent or substitute Zener diodes with compatible electrical and mechanical parameters to maintain system functionality, compliance, and serviceability.

Key Parameters

Parameter	PZM18NB,115
Voltage - Zener (Nom) (Vz)	18 V
Tolerance	±5%
Power - Max	300 mW
Impedance (Max) (Zzt)	20 Ohms
Current - Reverse Leakage @ Vr	70 nA @ 13 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA
Operating Temperature	-65°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	SMT3; MPAK
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8541.10.0050

Substitute Part Grouping Explanation

Substitution is based strictly on matching the following key parameters: nominal Zener voltage (18 V), tolerance (±5%), power rating (≥225 mW), surface mount package footprint (TO-236-3, SC-59, SOT-23-3 equivalent), maximum impedance (Zzt), reverse leakage current, forward voltage, operating temperature, and confirmed RoHS and REACH compliance. Substitute parts included are listed in the input and match these characteristics in all allowed aspects.

Parameter Comparison

Parameter	PZM18NB,115 (NXP USA Inc.)	CZRT5248B-G (Comchip)	BZX84-C18,215 (NXP USA Inc.)	MMBZ5248ELT1G (onsemi)
Voltage - Zener (Nom) (Vz)	18 V	18 V	18 V	18 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	300 mW	300 mW	250 mW	225 mW
Impedance (Max) (Zzt)	20 Ohms	21 Ohms	45 Ohms	21 Ohms
Current - Reverse Leakage @ Vr	70 nA @ 13 V	100 nA @ 14 V	50 nA @ 12.6 V	100 nA @ 14 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	SMT3; MPAK	SOT-23-3	SOT-23	SOT-23-3 (TO-236)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	-	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	-	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	-	REACH Unaffected
ECCN	EAR99	EAR99	EAR99	EAR99
HTSUS	8541.10.0050	8541.10.0050	8541.10.0050	8541.10.0050

Engineering Selection Recommendations

Select substitute Zener diodes that match the Zener voltage, tolerance, mounting type, package, and maximum power rating. All listed substitute diodes (CZRT5248B-G, BZX84-C18,215, MMBZ5248ELT1G) have stated RoHS3 compliance, MSL 1 where provided, and REACH unaffected status, and are listed as either active or in production. Product status should be reviewed in alignment with supply chain and compliance documentation requirements.

Frequently Asked Questions (FAQ)

Q: How is equivalency determined between Zener diode part numbers?
A: Equivalency is determined by matching Zener voltage, tolerance, maximum power, mounting style, and package type along with compliance parameters.

Q: What are the critical package requirements for Zener diode substitution?
A: The substitute part must use a compatible surface-mount package such as TO-236-3, SC-59, SOT-23-3, or equivalent as listed in the parameters.

Q: Can lower power substitutes be used for PZM18NB,115?
A: Substitute parts with a power rating equal to or above the original part are compatible. Substitute parts in this list provide detailed power ratings for engineering evaluation.

Q: Why are RoHS and REACH statuses important in substitution?
A: RoHS and REACH compliance ensures compatibility with environmental and regulatory requirements; only parts with matching compliance status are considered.

Q: How should inventory and part status affect selection?
A: Substitute selection considers only those parts listed as active or in production to ensure long-term supply and availability.

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