ISL6341CIRZ Equivalent & Substitute Parts

Part Overview

The ISL6341CIRZ is a buck regulator positive output step-down DC-DC controller IC manufactured by Renesas Electronics Corporation. This device functions as a transistor driver for single-output, single-phase buck topology applications with a switching frequency of 300kHz and maximum duty cycle of 85%. The ISL6341CIRZ is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

ISL6341CIRZ

Renesas Electronics CorporationIn Stock: 1052ISL6341CIRZ Datasheet

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NCP1589CMNTWG

onsemiIn Stock: 6473NCP1589CMNTWG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute components for the ISL6341CIRZ are identified based on strict alignment of core electrical and mechanical parameters that define functional equivalence in buck regulator controller applications. The substitution criteria are:

Primary Matching Parameters:

• Topology: Buck (step-down)
• Output Type: Transistor Driver
• Number of Outputs: 1
• Output Phases: 1
• Switching Frequency: 300kHz
• Synchronous Rectifier: Yes
• Package Category: 10-pin DFN with exposed pad (3x3mm footprint)
• Mounting Type: Surface Mount

Secondary Compatibility Parameters:

• Voltage Supply Range: Must accommodate the operating range of the application
• Maximum Duty Cycle: Must support the required output voltage ratio
• Control Features: Enable and Power Good functions required
• Operating Temperature Range: Must cover the application's thermal requirements
• Compliance: ROHS3 and REACH compliance maintained

The NCP1589CMNTWG manufactured by onsemi meets these substitution criteria with compatible electrical specifications and package footprint, enabling direct functional replacement in existing designs.

Parameter Comparison

Engineering Selection Recommendations

The NCP1589CMNTWG is a functionally equivalent substitute for the obsolete ISL6341CIRZ when the following conditions are met:

Mandatory Conditions for Substitution:

1. Application supply voltage does not exceed 13.2V (NCP1589CMNTWG maximum)
2. Required maximum duty cycle does not exceed 75% (NCP1589CMNTWG maximum)
3. Operating temperature range falls within -20°C ~ 70°C (NCP1589CMNTWG range)
4. Phase Control and Power on Reset features are not required by the application

Compliance & Availability:

• Both devices maintain ROHS3 compliance and REACH unaffected status
• NCP1589CMNTWG is actively manufactured by onsemi with 6400 units in stock, providing procurement continuity for the obsolete ISL6341CIRZ
• NCP1589CMNTWG features superior moisture sensitivity (MSL 1 vs. MSL 3), reducing handling and storage constraints

Package Compatibility:

• Both devices use 10-pin DFN packages with 3x3mm footprint and exposed pad
• PCB layout and thermal management design remain compatible
• NCP1589CMNTWG includes wettable flank feature, improving solderability

Frequently Asked Questions (FAQ)

Q: Can the NCP1589CMNTWG directly replace the ISL6341CIRZ in all applications?

A: Direct replacement is possible only when the application meets all specified parameter limits. The NCP1589CMNTWG has lower maximum supply voltage (13.2V vs. 14.4V), lower maximum duty cycle (75% vs. 85%), narrower operating temperature range (-20°C ~ 70°C vs. -40°C ~ 85°C), and lacks Phase Control and Power on Reset features. Verify your application requirements against these limits before substitution.

Q: What is the impact of the lower 75% maximum duty cycle on the NCP1589CMNTWG?

A: Maximum duty cycle determines the minimum achievable output voltage relative to input voltage. A 75% duty cycle supports output voltages down to approximately 25% of the input voltage. If your application requires lower output voltages (higher step-down ratios), the ISL6341CIRZ's 85% duty cycle may be necessary. Calculate your required duty cycle before selecting a substitute.

Q: Are the package footprints identical between ISL6341CIRZ and NCP1589CMNTWG?

A: Both devices use 10-pin DFN packages with 3x3mm footprint and exposed pad. The footprints are mechanically compatible for PCB layout purposes. However, verify pinout compatibility and signal routing in your specific design, as control feature differences may affect circuit implementation.

Q: What are the temperature range implications of the NCP1589CMNTWG?

A: The NCP1589CMNTWG operates from -20°C to 70°C, compared to the ISL6341CIRZ range of -40°C to 85°C. If your application requires operation below -20°C or above 70°C, the NCP1589CMNTWG is not suitable. Confirm your thermal operating requirements before substitution.

Q: Does the NCP1589CMNTWG lack critical control features?

A: The NCP1589CMNTWG includes Enable and Power Good functions but lacks Phase Control and Power on Reset features present in the ISL6341CIRZ. If your design relies on phase control for multi-phase synchronization or power-on reset sequencing, alternative substitutes must be evaluated.

Q: What is the significance of MSL 1 versus MSL 3 moisture sensitivity?

A: MSL 3 (168 hours) requires more stringent moisture control during storage and handling compared to MSL 1 (unlimited). The NCP1589CMNTWG's superior MSL rating reduces bake-out requirements and extends shelf life, simplifying inventory management and reducing production constraints.

Q: Are both devices RoHS and REACH compliant?

A: Yes, both the ISL6341CIRZ and NCP1589CMNTWG are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for commercial applications.