ISL6439IRZ Equivalent & Substitute Parts

Part Overview

The ISL6439IRZ is a buck regulator positive output step-down DC-DC controller IC manufactured by Renesas Electronics Corporation in a 16-QFN (5x5) package with exposed pad. This device functions as a transistor driver for single-output, single-phase buck topology applications with synchronous rectification capability. The ISL6439IRZ is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support, production continuity, and component procurement.

Substiute Parts

ISL6439IRZ

Renesas Electronics CorporationIn Stock: 898ISL6439IRZ Datasheet

Current PartRFQ

ISL6526AIRZ

Renesas Electronics CorporationIn Stock: 1333ISL6526AIRZ Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ISL6439IRZ is determined by strict equivalence across the following critical parameters:

• Package / Case: 16-VQFN Exposed Pad (16-QFN 5x5)
• Output Type: Transistor Driver
• Function: Step-Down
• Output Configuration: Positive
• Topology: Buck
• Number of Outputs: 1
• Output Phases: 1
• Voltage - Supply (Vcc/Vdd): 2.97V ~ 3.63V
• Duty Cycle (Max): 100%
• Synchronous Rectifier: Yes
• Control Features: Enable, Phase Control
• Operating Temperature: -40°C ~ 85°C (TA)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 3 (168 Hours)

The ISL6526AIRZ meets all substitution criteria as a parametric equivalent. Variations in switching frequency do not preclude substitution when all other electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

Both the ISL6439IRZ and ISL6526AIRZ are classified as obsolete products. Selection between these parts is based on compliance certifications and regulatory status. Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for applications requiring environmental compliance. The ISL6526AIRZ is available in higher inventory (1315 Pcs) compared to the ISL6439IRZ (880 Pcs), which may influence procurement decisions for production continuity. Both parts share identical electrical specifications for supply voltage, duty cycle, synchronous rectification, control features, and operating temperature range, confirming functional interchangeability within the specified parameter set.

Frequently Asked Questions (FAQ)

Q: Can the ISL6526AIRZ directly replace the ISL6439IRZ in existing designs?

A: Yes. Both devices share identical package geometry (16-VQFN Exposed Pad, 5x5mm), electrical specifications for supply voltage (2.97V ~ 3.63V), output configuration (positive, single-phase buck), control features (Enable, Phase Control), and operating temperature range (-40°C ~ 85°C). The switching frequency difference (300kHz vs. 600kHz) does not prevent substitution when circuit design accommodates the higher frequency operation.

Q: What is the significance of the switching frequency difference?

A: The ISL6526AIRZ operates at 600kHz compared to the ISL6439IRZ at 300kHz. This parameter difference does not violate substitution criteria as both devices maintain identical supply voltage, duty cycle, synchronous rectification capability, and control features. Circuit design must account for the frequency variation in passive component selection and EMI considerations.

Q: Are both parts suitable for new designs?

A: Both the ISL6439IRZ and ISL6526AIRZ are classified as obsolete. For new designs, consultation of current Renesas Electronics product lines is recommended to identify active alternatives within the ISL6439 or ISL6526 series families.

Q: What packaging considerations apply to these parts?

A: Both devices are supplied in 16-VQFN Exposed Pad packages with identical 5x5mm dimensions. The ISL6439IRZ is supplied in standard packaging, while the ISL6526AIRZ is supplied in tube packaging. Both are surface mount components with identical moisture sensitivity level (MSL 3, 168 hours), requiring equivalent handling and storage protocols.

Q: Do these parts meet environmental compliance requirements?

A: Yes. Both the ISL6439IRZ and ISL6526AIRZ are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component manufacturing and use.