TC646VPA Equivalent & Substitute Parts

Part Overview

The TC646VPA is a Brushless DC (BLDC) motor driver controller manufactured by Microchip Technology, designed for fan control applications. This 8-DIP through-hole integrated circuit operates across a 3V to 5.5V supply voltage range and functions as a speed controller with parallel interface connectivity. The device is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain disruptions, or manufacturing discontinuation of the primary component.

Substiute Parts

TC646VPA

Microchip TechnologyIn Stock: 1131TC646VPA Datasheet

Current PartRFQ

TC648VPA

Microchip TechnologyIn Stock: 957TC648VPA Datasheet

Parametric EquivalentRFQ

TC649VPA

Microchip TechnologyIn Stock: 1236TC649VPA Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TC646VPA is determined by strict parameter matching across the following critical criteria:

Mandatory Matching Parameters:

• Manufacturer: Microchip Technology
• Motor Type: Brushless DC (BLDC)
• Function: Controller - Speed
• Output Configuration: Pre-Driver - Low Side
• Interface: Parallel
• Voltage Supply Range: 3V ~ 5.5V
• Operating Temperature: 0°C ~ 85°C (TA)
• Package Type: 8-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• RoHS Status: ROHS3 Compliant
• MSL Rating: 1 (Unlimited)

The TC648VPA and TC649VPA meet all mandatory matching parameters and are classified as parametric equivalents. Both devices share identical electrical specifications, thermal operating ranges, packaging dimensions, and compliance certifications with the TC646VPA.

Parameter Comparison

Engineering Selection Recommendations

All three devices—TC646VPA, TC648VPA, and TC649VPA—maintain Active product status with identical compliance certifications (RoHS3, REACH Unaffected, EAR99 classification). Selection between these parts should be based on:

1. Inventory Availability: TC649VPA offers the highest current stock (1214 Pcs), followed by TC646VPA (1030 Pcs) and TC648VPA (858 Pcs).

2. Series Designation: TC646VPA and TC649VPA are designated as FanSense™ series devices, while TC648VPA carries no series designation. This distinction does not affect electrical or mechanical compatibility.

3. Pin-for-Pin Compatibility: All three devices share identical 8-PDIP package geometry and through-hole mounting specifications, ensuring direct PCB footprint compatibility without layout modifications.

4. Compliance Parity: All devices meet identical regulatory requirements and environmental standards, supporting equivalent deployment in regulated applications.

Frequently Asked Questions (FAQ)

Q: Are TC648VPA and TC649VPA direct pin-for-pin replacements for TC646VPA?

A: Yes. All three devices utilize the 8-PDIP package with 0.300" (7.62mm) spacing and identical through-hole mounting specifications. No PCB layout modifications are required for substitution.

Q: What determines whether a part qualifies as a substitute for TC646VPA?

A: Substitution eligibility requires matching across all critical parameters: Microchip Technology manufacturer origin, Brushless DC motor control function, parallel interface, 3V–5.5V supply voltage range, 0°C–85°C operating temperature, 8-DIP package type, through-hole mounting, RoHS3 compliance, and MSL-1 rating.

Q: Does the FanSense™ series designation affect compatibility?

A: No. The FanSense™ series designation is a product line identifier and does not impact electrical performance or mechanical compatibility. TC648VPA operates identically to TC646VPA and TC649VPA despite lacking this designation.

Q: Can these parts be used interchangeably in fan controller applications?

A: Yes. All three devices are specified for fan controller applications with identical speed control functionality, output configuration, and interface specifications.

Q: Are there any differences in compliance or regulatory status between these parts?

A: No. All three devices carry identical RoHS3 compliance, REACH Unaffected status, EAR99 export classification, and HTSUS coding (8542.31.0001).

Q: Which substitute part should be selected based on availability?

A: Selection should prioritize current inventory levels. TC649VPA (1214 Pcs) provides the highest availability, followed by TC646VPA (1030 Pcs) and TC648VPA (858 Pcs).