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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching RegulatorsAST1S31HF
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AST1S31HF - STMicroelectronics

Manufacturer Part Number
AST1S31HF
Manufacturer
STMicroelectronics
Allelco Part Number
32D-AST1S31HF
Warranty
1 Year Allelco Warranty - Find out more
Parts Description
IC REG BUCK ADJ 3A 8VFDFPN
Package
8-VFDFPN (3x3)
Data sheet
1.AST1S31HF.pdf ...

PCN Packaging

2.73KHz.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 15407
  • Unit Price: $1.551
  • Subtotal: $0.00

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Add to Cart and Submit RFQ now, we'll contact you immediately.

Quantity Unit Price Ext. Price
1+ $1.551 $1.55
200+ $0.60 $120.00
500+ $0.579 $289.50
1000+ $0.569 $569.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.
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Specifications

AST1S31HF Tech Specifications
STMicroelectronics - AST1S31HF technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - AST1S31HF

Product Attribute Attribute Value  
Manufacturer STMicroelectronics  
Voltage - Output (Min/Fixed) 0.8V  
Voltage - Output (Max) 4V  
Voltage - Input (Min) 2.8V  
Voltage - Input (Max) 4V  
Topology Buck  
Synchronous Rectifier Yes  
Supplier Device Package 8-VFDFPN (3x3)  
Series Automotive, AEC-Q100  
Package / Case 8-VDFN Exposed Pad  
Product Attribute Attribute Value  
Package Tape & Reel (TR)  
Output Type Adjustable  
Output Configuration Positive  
Operating Temperature -40°C ~ 150°C (TJ)  
Number of Outputs 1  
Mounting Type Surface Mount  
Function Step-Down  
Frequency - Switching 2.3MHz  
Current - Output 3A  
Base Product Number AST1S31  

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

Manufacturer Part Number

AST1S31HF

Manufacturer

stmicroelectronics

Introduction

The AST1S31HF is a high-efficiency, step-down DC DC switching regulator designed for power management, specifically tailored for automotive applications.

Product Features and Performance

High-efficiency step-down voltage regulation

Adjustable output voltage range from 0.8V to 4V

Capable of delivering a 3A output current

3MHz switching frequency for compact solution size

Integrated synchronous rectifier for improved efficiency

Operation temperature range from -40°C to 150°C

Automotive grade with AEC-Q100 qualification

Product Advantages

High efficiency reduces thermal footprint and energy loss

Adjustable output supports a wide range of use cases

High-frequency operation allows for smaller external components

Synchronous rectification optimizes power conversion efficiency

Wide operating temperature range suitable for automotive environments

AEC-Q100 qualification ensures automotive reliability standards

Key Technical Parameters

Voltage Input (Min): 2.8V

Voltage Input (Max): 4V

Voltage Output (Min/Fixed): 0.8V

Voltage Output (Max): 4V

Current Output: 3A

Frequency Switching: 2.3MHz

Operating Temperature: -40°C ~ 150°C (TJ)

Quality and Safety Features

Operates reliably in extreme temperatures

AEC-Q100 qualified for automotive use

Built-in protection features for enhanced safety

Compatibility

Surface mount technology for easy PCB integration

Compact 8-VDFN exposed pad package for space-sensitive applications

Application Areas

Automotive power systems

Electronic control units (ECUs)

Power supply modules for automotive sensors

Infotainment systems

Product Lifecycle

Currently marked as Active

Not nearing discontinuation, ensuring steady availability

Upgrades or replacements should be monitored but are not imminent

Several Key Reasons to Choose This Product

Designed to meet stringent automotive standards

High-efficiency performance minimizes energy loss

Flexible output voltage range suits various automotive applications

Stable operation across a broad temperature range

Compact size supports design in space-constrained environments

AEC-Q100 qualification affirms reliability in automotive conditions

Parts with Similar Specifications

The three parts on the right have similar specifications to STMicroelectronics AST1S31HF

Product Attribute AST1S31HF AST1S31PUR AST13SEBQ AST1500
Part Number AST1S31HF AST1S31PUR AST13SEBQ AST1500
Manufacturer STMicroelectronics STMicroelectronics CIT Relay and Switch ASPEED
Voltage - Input (Min) 2.8V 2.8V - -
Output Type Adjustable Adjustable - -
Topology Buck Buck - -
Voltage - Output (Max) 4V 4V - -
Package / Case 8-VDFN Exposed Pad 8-VDFN Exposed Pad - -
Voltage - Input (Max) 4V 4V - -
Output Configuration Positive Positive - -
Frequency - Switching 2.3MHz 1.5MHz - -
Package Tape & Reel (TR) Tape & Reel (TR) Bulk -
Synchronous Rectifier Yes Yes - -
Series Automotive, AEC-Q100 - AST -
Supplier Device Package 8-VFDFPN (3x3) 8-VFDFPN (3x3) - -
Operating Temperature -40°C ~ 150°C (TJ) -40°C ~ 150°C (TJ) -40°C ~ 85°C -
Voltage - Output (Min/Fixed) 0.8V 0.8V - -
Mounting Type Surface Mount Surface Mount Panel Mount -
Current - Output 3A 3A - -
Number of Outputs 1 1 - -
Base Product Number AST1S31 AST1S31 AST13 -
Function Step-Down Step-Down - -

AST1S31HF Datasheet PDF

Download AST1S31HF pdf datasheets and STMicroelectronics documentation for AST1S31HF - STMicroelectronics.

HTML Datasheet
Cylindrical Battery Holders.pdf
PCN Packaging
2.73KHz.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

  • Kevi***.
    Mar 17, 2026

    Fast switching and stable output. Very satisfied with this IC

  • Daou***hekebkeb
    Jun 16, 2024

    I had a great experience purchasing items from Allelcoelec, I recommend

  • Uri ***al
    Jun 19, 2024

    Good comunication,
    Transpnt regarding the process and price.

  • Yaqu***l Ali
    Jun 19, 2024

    Providing reasonable prices, regular follow-up of orders, providing accurate and regular invoices, timely delivery of goods, excellent customer service and providing original goods and best quality materials.

  • Lea ***
    Jun 19, 2024

    Morrey was very helpful and right on top of things!
    He replied quickly to my RFQ. He was very courteous and professional.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.

Payment Support

The payment method can be chosen from the methods shown below: Wire Transfer (T/T, Bank Transfer), Western Union, Credit card, PayPal.

Your Faithful Supply Chain Partner -

Contact us if you have any questions.

  1. Phone
    +00852 9146 4856

Certifications & Memberships

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AST1S31HF Image

AST1S31HF

STMicroelectronics
32D-AST1S31HF

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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