RN142ZST2R RF PIN Diode Equivalent & Substitute Parts

Part Overview

The RN142ZST2R is an RF PIN diode manufactured by Rohm Semiconductor, designed for RF switching and attenuation applications. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The RN142ZST2R operates at a peak reverse voltage of 30V with a maximum current rating of 50 mA, packaged in the compact 0201 (0603 Metric) form factor using the GMD2 supplier package.

Substiute Parts

RN142ZST2R

Rohm SemiconductorIn Stock: 48133RN142ZST2R Datasheet

Current PartRFQ

RN142SMT2R

Rohm SemiconductorIn Stock: 21255RN142SMT2R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RN142ZST2R is determined by the following critical parameters:

• Diode Type: PIN - Single configuration must be maintained
• Voltage Rating: Peak reverse voltage must meet or exceed 30V
• Current Rating: Maximum current capacity must support 50 mA operation
• Capacitance Characteristics: Capacitance at 1V, 1MHz should remain consistent for RF performance
• Resistance Characteristics: Forward resistance at specified bias conditions
• Operating Temperature: Maximum junction temperature of 150°C
• RoHS and Compliance Status: ROHS3 compliance and REACH unaffected status required

The RN142SMT2R qualifies as a substitute based on these parameters. While it features enhanced electrical specifications (60V peak reverse voltage, 100 mA maximum current), it maintains the same diode type, capacitance profile, operating temperature range, and compliance certifications. The package format differs (SOD-523 versus GMD2), requiring mechanical verification for board-level compatibility.

Parameter Comparison

Engineering Selection Recommendations

The RN142SMT2R is an active product with current manufacturing support from Rohm Semiconductor, providing supply chain continuity for the obsolete RN142ZST2R. Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent applications.

The RN142SMT2R provides superior electrical performance with doubled peak reverse voltage (60V versus 30V) and doubled maximum current capacity (100 mA versus 50 mA). These enhanced ratings provide additional design margin for RF switching and attenuation circuits. The capacitance characteristic remains identical at 0.45pF, preserving RF performance parameters.

Forward resistance increases from 1.5Ohm to 2Ohm at the specified bias condition, representing a 33% increase. This parameter change must be evaluated within the context of the specific RF circuit application.

Package format transition from GMD2 (0201/0603 Metric) to SOD-523 (SC-79) requires mechanical board layout verification to confirm footprint compatibility and assembly process alignment.

Frequently Asked Questions (FAQ)

Q: Can the RN142SMT2R directly replace the RN142ZST2R without circuit modification?

A: The RN142SMT2R maintains the same diode type, capacitance, and operating temperature range. However, the package format differs (SOD-523 versus GMD2), requiring board-level footprint verification. The increased forward resistance (2Ohm versus 1.5Ohm) must be evaluated within the specific circuit application to confirm functional equivalence.

Q: What is the significance of the capacitance specification at 1V, 1MHz?

A: Capacitance at 1V, 1MHz is a critical RF performance parameter for PIN diodes used in switching and attenuation applications. Both the RN142ZST2R and RN142SMT2R maintain identical capacitance at this specification point (0.45pF), ensuring consistent RF behavior in equivalent circuits.

Q: Why does the RN142SMT2R have higher voltage and current ratings?

A: The RN142SMT2R represents an enhanced variant within the RN142 product family. The higher ratings (60V peak reverse, 100 mA maximum current) provide additional design margin and operational flexibility while maintaining the same core RF characteristics and compliance status.

Q: Is the package change from GMD2 to SOD-523 a limiting factor for substitution?

A: Package format is a mechanical consideration separate from electrical substitution criteria. The SOD-523 package is a standard RF diode form factor. Board layout and assembly process compatibility must be confirmed before implementation, but the package change does not affect electrical substitution eligibility.

Q: Are both parts compliant with current regulatory requirements?

A: Both the RN142ZST2R and RN142SMT2R are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic component manufacturing and use.