BZX84-C18/LF1VL Equivalent & Substitute Parts

Part Overview

The BZX84-C18/LF1VL is an 18 V Zener diode rated at 250 mW, manufactured by NXP USA Inc. in the SOT-23 (TO-236AB) surface mount package. This component is qualified to AEC-Q101 automotive standards and maintains active product status. Substitute parts are identified based on matching electrical specifications and package compatibility, enabling component sourcing flexibility while maintaining circuit performance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	18	V
Tolerance	±5%	-
Power - Max	250	mW
Impedance (Max)	45	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 12.6 V	-
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	-
Operating Temperature Range	-65°C to 150°C	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
Mounting Type	Surface Mount	-
Grade	Automotive	-
Qualification	AEC-Q101	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the BZX84-C18/LF1VL are classified based on the following criteria:

Direct Manufacturer Equivalent: Parts sharing identical electrical specifications (18 V nominal Zener voltage, 250 mW power rating, ±5% tolerance) and package designation (TO-236AB).

Parametric Equivalents: Parts maintaining the 18 V nominal Zener voltage and 250 mW power rating with variations in tolerance specification (±1% or ±2%) and reverse leakage measurement conditions. These parts are functionally interchangeable in applications where the tighter tolerance provides enhanced performance margin.

All substitute parts maintain:

18 V nominal Zener voltage
250 mW maximum power dissipation
45 Ohms maximum impedance
-65°C to 150°C operating temperature range
Automotive grade qualification (AEC-Q101)
Surface mount SOT-23 package family
ROHS3 compliance

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Operating Temp	Package	AEC-Q101
BZX84-C18/LF1VL	NXP USA Inc.	18 V	±5%	250 mW	45 Ω	50 nA @ 12.6 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23 (TO-236AB)	Yes
BZX84-C18,235	NXP Semiconductors	18 V	±5%	250 mW	45 Ω	50 nA @ 12.6 V	900 mV @ 10 mA	-65°C ~ 150°C	TO-236AB	Yes
BZX84-A18,215	NXP USA Inc.	18 V	±1%	250 mW	45 Ω	50 nA @ 700 mV	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23	Yes
BZX84-A18,235	Nexperia USA Inc.	18 V	±1%	250 mW	45 Ω	50 nA @ 700 mV	900 mV @ 10 mA	-65°C ~ 150°C	TO-236AB	Yes
BZX84-B18,215	Nexperia USA Inc.	18 V	±2%	250 mW	45 Ω	50 nA @ 12.6 V	900 mV @ 10 mA	-65°C ~ 150°C	TO-236AB	Yes
BZX84-B18,235	Nexperia USA Inc.	18 V	±2%	250 mW	45 Ω	50 nA @ 12.6 V	900 mV @ 10 mA	-65°C ~ 150°C	TO-236AB	Yes
BZX84-C18,215	NXP USA Inc.	18 V	±5%	250 mW	45 Ω	50 nA @ 12.6 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23	Yes

Engineering Selection Recommendations

All listed substitute parts maintain full compatibility with the BZX84-C18/LF1VL in terms of electrical performance and automotive qualification. Selection among substitutes is determined by:

Tolerance Requirements: The BZX84-C18/LF1VL operates at ±5% tolerance. Parts designated BZX84-A (±1% tolerance) and BZX84-B (±2% tolerance) provide tighter voltage regulation margins and are directly substitutable for applications requiring enhanced precision. Parts with matching ±5% tolerance (BZX84-C series) maintain identical performance characteristics.

Package Designation: All parts are available in SOT-23 or TO-236AB package variants. These designations are mechanically and electrically equivalent within the TO-236-3 / SC-59 family. Selection between packaging options depends on supplier availability and procurement requirements.

Compliance Status: All substitute parts carry AEC-Q101 automotive qualification, ROHS3 compliance, and unlimited moisture sensitivity level (MSL 1), ensuring suitability for automotive and industrial applications.

Inventory Availability: Substitute parts are selected based on current stock levels and delivery requirements. BZX84-B18,215 maintains the highest inventory (900,400 pcs), while BZX84-A18,215 maintains the lowest (2,256 pcs).

Frequently Asked Questions (FAQ)

Q: Can BZX84-A18 series parts replace BZX84-C18/LF1VL?

A: Yes. BZX84-A18 parts (±1% tolerance) are directly substitutable. The tighter tolerance specification provides enhanced voltage regulation precision while maintaining identical 18 V nominal voltage, 250 mW power rating, and automotive qualification. No circuit modifications are required.

Q: What is the difference between BZX84-A, BZX84-B, and BZX84-C series?

A: The letter designation indicates tolerance specification. BZX84-A = ±1%, BZX84-B = ±2%, BZX84-C = ±5%. All three series share identical electrical performance (18 V, 250 mW, 45 Ω impedance) and package compatibility. Selection depends on application tolerance requirements.

Q: Are TO-236AB and SOT-23 packages interchangeable?

A: Yes. TO-236AB and SOT-23 are equivalent designations for the same three-lead surface mount package. Both refer to the same physical footprint and pin configuration. Parts specified as either package type are mechanically and electrically compatible.

Q: What is the significance of the part number suffix (,215 vs ,235)?

A: The numeric suffix indicates packaging format. Suffix ,215 typically denotes Cut Tape (CT) or Digi-Reel® packaging, while ,235 denotes Tape & Reel (TR) packaging. Both formats contain identical components; selection depends on procurement and assembly process requirements.

Q: Can I use BZX84-C18,235 in place of BZX84-C18/LF1VL?

A: Yes. BZX84-C18,235 is a direct manufacturer equivalent with identical electrical specifications, tolerance, power rating, and package designation. The primary difference is packaging format (Tape & Reel vs. the original format).

Q: Are all substitute parts AEC-Q101 qualified?

A: Yes. All listed substitute parts carry AEC-Q101 automotive qualification, confirming compliance with automotive reliability and quality standards. This qualification is maintained across all tolerance grades (A, B, C series).

Q: What is the reverse leakage difference between parts specified at 12.6 V versus 700 mV?

A: Both measurements indicate reverse leakage current of 50 nA under different test voltage conditions. The measurement voltage difference reflects manufacturer test methodology variations. Both specifications confirm equivalent leakage performance for circuit design purposes.

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