AS1918S-T Equivalent & Substitute Parts Reference

Part Overview

The AS1918S-T is a single-channel power management supervisor integrated circuit manufactured by ams-OSRAM USA INC. in SOT-23-5 surface mount packaging. This device functions as a simple reset/power-on reset supervisor with open drain or open collector output configuration, designed to monitor a single voltage threshold at 2.93V with an active low reset signal and 100ms minimum reset timeout.

The AS1918S-T is classified as an obsolete product. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this supervisor topology.

Substiute Parts

AS1918S-T

ams-OSRAM USA INC.In Stock: 1149AS1918S-T Datasheet

Current PartRFQ

2U3838K33QDBVRG4Q1

Texas InstrumentsIn Stock: 8022U3838K33QDBVRG4Q1 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AS1918S-T is determined by strict equivalence across the following critical parameters:

Functional Parameters:

• Single voltage monitoring channel
• Voltage threshold: 2.93V
• Output type: Open drain or open collector
• Reset logic: Active low
• Reset timeout: 100ms minimum

Physical Parameters:

• Package type: SOT-23-5 (SC-74A, SOT-753)
• Mounting: Surface mount
• Operating temperature range: -40°C to 125°C

Environmental Parameters:

• Moisture sensitivity level: 1 (Unlimited)
• REACH compliance status: REACH Unaffected

The substitute part 2U3838K33QDBVRG4Q1 manufactured by Texas Instruments meets all these criteria and is therefore classified as a parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

The 2U3838K33QDBVRG4Q1 from Texas Instruments is a direct parametric equivalent to the obsolete AS1918S-T. Both devices share identical functional specifications, electrical characteristics, and physical packaging.

Compliance Considerations:

The 2U3838K33QDBVRG4Q1 carries additional qualifications not specified for the AS1918S-T:

• Automotive Grade qualification
• AEC-Q100 certification
• RoHS3 compliance

These additional certifications indicate the Texas Instruments part meets automotive industry standards and environmental compliance requirements. The substitute part is suitable for applications requiring equivalent supervisor functionality with enhanced supply chain stability, as it carries a "Last Time Buy" status compared to the "Obsolete" status of the original part.

Both parts are available in tape and reel packaging for production environments. Current inventory levels are 739 units for the substitute part.

Frequently Asked Questions (FAQ)

Q: Can the 2U3838K33QDBVRG4Q1 be used as a direct replacement for the AS1918S-T?

A: Yes. Both parts are parametric equivalents with identical voltage threshold (2.93V), output configuration (open drain/open collector), reset logic (active low), reset timeout (100ms minimum), operating temperature range (-40°C to 125°C), and SOT-23-5 packaging. Pin-to-pin compatibility is maintained.

Q: What is the difference in product status between these parts?

A: The AS1918S-T is classified as obsolete, indicating it is no longer manufactured. The 2U3838K33QDBVRG4Q1 carries a "Last Time Buy" status, meaning Texas Instruments will continue production for a limited period before discontinuation. This provides a defined transition window for design migration.

Q: Are there packaging differences between the two parts?

A: Both parts use identical SOT-23-5 (SC-74A, SOT-753) surface mount packaging. The 2U3838K33QDBVRG4Q1 is supplied in tape and reel format, which is standard for production environments.

Q: Does the Texas Instruments part have additional certifications?

A: Yes. The 2U3838K33QDBVRG4Q1 includes automotive grade qualification and AEC-Q100 certification, along with RoHS3 compliance. The AS1918S-T specifications do not include these certifications. Both parts maintain REACH Unaffected status and EAR99 export classification.

Q: Are the moisture sensitivity levels identical?

A: Yes. Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: What are the current inventory levels?

A: The AS1918S-T has 1119 units in stock. The 2U3838K33QDBVRG4Q1 substitute has 739 units available.