HSMP-389B-TR1G Equivalent & Substitute Parts

Part Overview

The HSMP-389B-TR1G is an RF Diode PIN - Single manufactured by Broadcom Limited, rated for 100V peak reverse voltage and 1 A maximum current in an SC-70 SOT-323 package. This component is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. The part operates at a maximum junction temperature of 150°C and exhibits 0.3 pF capacitance at 5V, 1MHz and 2.5 Ohm resistance at 5mA, 100MHz.

Substiute Parts

HSMP-389B-TR1G

Broadcom LimitedIn Stock: 19130HSMP-389B-TR1G Datasheet

Current PartRFQ

CLA4611-085LF

Skyworks Solutions Inc.In Stock: 2240CLA4611-085LF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HSMP-389B-TR1G is determined by the following electrical and mechanical criteria:

Functional Equivalence Requirements:

• Diode Type: PIN - Single (same topology required)
• Voltage Rating: Minimum 100V peak reverse voltage (equal or higher acceptable)
• Current Rating: Minimum 1 A maximum current (equal or higher acceptable)
• Capacitance Characteristics: Similar range at specified bias conditions
• Resistance Characteristics: Similar range at specified bias conditions
• Operating Temperature: Minimum 150°C junction temperature capability
• Package Compatibility: Physical and electrical compatibility with SOT-323 footprint or equivalent

The substitute part CLA4611-085LF meets these criteria with enhanced electrical specifications (180V voltage rating, 1.5 A current rating, 2 W power dissipation) and maintains PIN diode single-element topology. The part is Active status with RoHS3 compliance, providing long-term availability and regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

The CLA4611-085LF serves as a functional substitute for the obsolete HSMP-389B-TR1G based on the following engineering factors:

Electrical Compatibility: The substitute part exceeds the original specifications in voltage rating (180V vs. 100V), current capacity (1.5 A vs. 1 A), and operating temperature range (175°C vs. 150°C). These enhanced ratings provide design margin and support higher-stress applications. The capacitance and resistance characteristics remain within similar operational ranges, maintaining RF performance compatibility for PIN diode applications.

Regulatory & Compliance Status: The CLA4611-085LF is Active status with RoHS3 compliance, ensuring continued manufacturing availability and alignment with current environmental regulations. Both parts maintain REACH Unaffected status and equivalent moisture sensitivity levels (MSL 1).

Package Consideration: The substitute employs a 3-QFN (2x2) package form factor rather than the original SOT-323. PCB layout redesign is required to accommodate the different package geometry. The exposed pad in the QFN package provides improved thermal performance compared to the SOT-323 configuration.

Inventory & Availability: The substitute part maintains active production status with documented inventory, supporting long-term supply chain continuity for the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the CLA4611-085LF directly replace the HSMP-389B-TR1G without circuit modifications?

A: Electrical substitution is feasible due to functional equivalence in PIN diode topology and superior electrical ratings. However, package geometry differs (3-QFN vs. SOT-323), requiring PCB layout modifications. Circuit performance should be validated for the specific application, particularly regarding RF impedance matching and thermal management in the new package form factor.

Q: What are the key electrical differences between these parts?

A: The CLA4611-085LF provides higher voltage rating (180V vs. 100V), higher current capacity (1.5 A vs. 1 A), and higher operating temperature (175°C vs. 150°C). Resistance is lower (1.2 Ohm vs. 2.5 Ohm), which may affect RF circuit impedance. Capacitance values are similar but measured at different bias conditions (38V vs. 5V).

Q: Are there package compatibility concerns?

A: Yes. The original HSMP-389B-TR1G uses SC-70 SOT-323 packaging, while the CLA4611-085LF uses 3-QFN (2x2) packaging. These are physically and electrically different form factors. PCB footprint redesign is mandatory. The QFN package includes an exposed pad for improved thermal dissipation.

Q: What compliance certifications apply to the substitute part?

A: The CLA4611-085LF is RoHS3 compliant and REACH unaffected. Both parts share equivalent moisture sensitivity levels (MSL 1 - Unlimited). Regulatory alignment supports use in current manufacturing environments.

Q: Why is the original part classified as Obsolete?

A: Broadcom Limited has discontinued the HSMP-389B-TR1G. The CLA4611-085LF from Skyworks Solutions Inc. represents an active alternative with equivalent or superior electrical performance and current manufacturing support.

Q: How do the RF characteristics compare?

A: Both parts are PIN diodes with similar capacitance ranges (0.3 pF vs. 0.35 pF). The substitute exhibits lower series resistance (1.2 Ohm vs. 2.5 Ohm) and maintains RF performance at higher frequencies (500MHz vs. 100MHz measurement conditions). Application-specific RF circuit validation is recommended.