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A4942GESTR-T The Allegro MicroSystems A4942GESTR-T is a three-phase sensorless fan driver IC. It features closed-loop speed control and a PWM input for speed demand.
Mfr Part #:

A4942GESTR-T

Available from 1 distributors
Mfr Name: Allegro Microsystems
Allegro Microsystems
The Allegro MicroSystems A4942GESTR-T is a three-phase sensorless fan driver IC. It features closed-loop speed control and a PWM input for speed demand.
✓ Total Stock: 557 pcs
$ Price Range: $2.25

A4942GESTR-T Available from 1 distributor

✓ Authorised
✓ Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
Smaxon Electronics ✓
Non-Authorised Inventory information
557 pcs
On Request
557 pcs On Request 1 On Request On Request 1730+ On Request On Request
DistyParts aggregates offers from multiple distributors. Final prices, lead times and terms are subject to the distributors' discretion and may change without prior notice. DistyParts is not liable for any discrepancies.

A4942GESTR-T Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Applications
Function
Interface
Motor Type
Mounting Type
Operating Temperature
Output Configuration
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A4942GESTR-T Description

Short technical summary and product information.

The A4942GESTR-T from Allegro MicroSystems is a three-phase motor driver designed for sensorless fan applications, eliminating the need for Hall sensors through BEMF sensing.

 

This integrated circuit incorporates a closed-loop speed control system, allowing for accurate setting of maximum and minimum speeds via external resistors. Speed is managed by a duty cycle demand applied to the PWM input, which supports a wide frequency range. Integrated current limiting negates the need for an external sense resistor and includes an adjustable soft start feature to minimize power supply load during fan ramp-up.

 

The A4942GESTR-T is supplied in a 20-contact 4 mm × 4 mm QFN package with an exposed pad for enhanced thermal dissipation. The package is lead (Pb) free with 100% matte tin leadframe plating. It operates within a temperature range of -40°C to 105°C (TA).

 

Key features include sensorless operation, PWM speed input, FG speed output, lock detection, soft start, and overcurrent protection. Soft switching is employed to reduce audible noise.

A4942GESTR-T Quick Information

Product Type: Motor Driver IC
Canonical Name: A4942 Three-Phase Sensorless Fan Driver
Subcategory: Brushless DC (BLDC) Motor Driver

A4942GESTR-T Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

A4942GESTR-T Estimated Pricing

Qty Low High
1+ $2.25 $2.25

Estimated market price range - modelled values for guidance only, not live distributor offers.

A4942GESTR-T Features

  • Three-phase sensorless fan driver.
  • Integrated closed-loop speed control.
  • PWM speed input and FG speed output.
  • Overcurrent protection with soft start.
  • 20-QFN-EP package with exposed pad.

A4942GESTR-T Applications

  • Ideal for sensorless fan applications.
  • Suitable for variable speed fan control.
  • Used in systems requiring motor monitoring.
  • Enables reduced component count designs.

A4942GESTR-T FAQs

6 frequently asked questions generated from this part’s specifications.
What is the operating temperature range of the A4942GESTR-T?

-40°C to 105°C

What type of motor does the A4942GESTR-T driver support?

Brushless DC (BLDC) motors

What output configuration does the A4942GESTR-T have?

Half Bridge (3)

What interface does the A4942GESTR-T use for control?

PWM

What package is the A4942GESTR-T available in?

20-WFQFN Exposed Pad (20-QFN-EP, 4x4 mm)

What is the primary application of the A4942GESTR-T?

Fan Motor Driver

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