PT7M1818-20TEX Equivalent & Substitute Parts

Part Overview

The PT7M1818-20TEX is a supervisor integrated circuit designed for power management applications, specifically functioning as a simple reset/power-on reset device with bidirectional output capability. Manufactured by Diodes Incorporated, this component operates as a 1-channel voltage supervisor in a compact SOT-23-3 surface mount package.

The PT7M1818-20TEX is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this supervisor IC.

Substiute Parts

PT7M1818-20TEX

Diodes IncorporatedIn Stock: 1100PT7M1818-20TEX Datasheet

Current PartRFQ

RT9818C-25GV

Richtek USA Inc.In Stock: 16586RT9818C-25GV Datasheet

MFR RecommendedRFQ

STM1818RWX7F

STMicroelectronicsIn Stock: 173473STM1818RWX7F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PT7M1818-20TEX are selected based on strict alignment with the following critical parameters:

• Voltage Threshold: 2.5V nominal (tolerance range 2.5V to 2.55V acceptable)
• Number of Voltages Monitored: 1 channel
• Package / Case: SOT-23-3 (TO-236-3, SC-59)
• Reset Logic: Active Low
• Mounting Type: Surface Mount
• Operating Temperature Range: Minimum -40°C to 85°C
• RoHS Compliance: ROHS3 Compliant

The PT7M1818-20TEX features bidirectional output capability. Substitute parts may feature open drain or open collector output configurations, which are functionally compatible in reset/power-on reset applications where the output drives external logic or pull-up networks.

Parameter Comparison

Engineering Selection Recommendations

Both RT9818C-25GV and STM1818RWX7F are active product alternatives to the obsolete PT7M1818-20TEX.

RT9818C-25GV (Richtek USA Inc.): This substitute maintains identical voltage threshold (2.5V) and operating temperature range (-40°C ~ 85°C) as the original part. Reset timeout specification (143ms minimum) is within acceptable tolerance of the original (140ms minimum). The open drain or open collector output is functionally compatible with bidirectional reset applications. Both parts carry ROHS3 compliance. Moisture sensitivity level is MSL 3 (168 hours), requiring controlled storage conditions compared to the original MSL 1 rating.

STM1818RWX7F (STMicroelectronics): This substitute provides voltage threshold of 2.55V, which is within acceptable tolerance of the original 2.5V specification. Operating temperature range extends to 105°C, exceeding the original -40°C ~ 85°C range. Reset timeout is 100ms minimum, which is shorter than the original 140ms specification and may require circuit validation in timing-critical applications. Output configuration includes open drain with bidirectional capability, matching the original output type. Both parts carry ROHS3 compliance and MSL 1 rating, matching the original moisture sensitivity classification.

Frequently Asked Questions (FAQ)

Q: Can RT9818C-25GV directly replace PT7M1818-20TEX in all applications?

A: RT9818C-25GV is electrically compatible based on voltage threshold, reset logic, and package specifications. However, the moisture sensitivity level differs (MSL 3 vs. MSL 1). Applications requiring unlimited shelf life storage should account for the 168-hour MSL 3 limitation of the RT9818C-25GV.

Q: What is the significance of the reset timeout difference between PT7M1818-20TEX (140ms) and STM1818RWX7F (100ms)?

A: Reset timeout defines the minimum duration the reset output remains asserted after power supply stabilization. The STM1818RWX7F's shorter 100ms timeout may affect system initialization timing. Applications with specific reset pulse width requirements should validate compatibility through circuit simulation or prototype testing.

Q: Are all three parts pin-compatible?

A: Yes. PT7M1818-20TEX, RT9818C-25GV, and STM1818RWX7F all use the SOT-23-3 package (TO-236-3, SC-59), providing identical pinout and footprint compatibility for surface mount applications.

Q: What is the difference between bidirectional output and open drain output?

A: Bidirectional output can source and sink current. Open drain output can only sink current and requires an external pull-up resistor to establish a high logic level. Both configurations are compatible in reset supervisor applications where the output drives external logic circuits with appropriate pull-up networks.

Q: Which substitute part is recommended for new designs?

A: Both RT9818C-25GV and STM1818RWX7F are active products suitable for new designs. Selection depends on specific application requirements: RT9818C-25GV for applications matching the original operating temperature range, or STM1818RWX7F for applications requiring extended temperature operation to 105°C. Verify reset timeout requirements against circuit specifications.

Q: Are all substitute parts RoHS compliant?

A: Yes. PT7M1818-20TEX, RT9818C-25GV, and STM1818RWX7F all carry ROHS3 compliance certification.