PT7M8218B18CE Equivalent & Substitute Parts

Part Overview

The PT7M8218B18CE is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to deliver a fixed 1.8V output at 300mA. This device operates as a positive fixed regulator with integrated enable control and protection features including over-current and over-temperature monitoring. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

PT7M8218B18CE

Diodes IncorporatedIn Stock: 828PT7M8218B18CE Datasheet

Current PartRFQ

TLV70218DBVR

Texas InstrumentsIn Stock: 135432TLV70218DBVR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PT7M8218B18CE is determined by the following critical parameters:

• Fixed output voltage of 1.8V
• Maximum output current of 300mA
• Maximum input voltage of 5.5V
• Positive fixed regulator configuration
• Enable control feature
• Over-current and over-temperature protection
• Surface mount packaging in 5-pin configuration
• Operating temperature range compatibility

The TLV70218DBVR from Texas Instruments meets these core functional requirements. While the package designation differs (SOT-23-5 versus SC-70-5), both are 5-pin surface mount packages suitable for the same electrical application. The substitute part maintains electrical equivalence across all critical parameters including output voltage, output current, input voltage rating, and protection features.

Parameter Comparison

Engineering Selection Recommendations

The TLV70218DBVR is the designated manufacturer-recommended substitute for the PT7M8218B18CE. Both devices are ROHS3 compliant and carry identical MSL ratings. The substitute part is currently in active production status, ensuring long-term availability and supply chain stability compared to the obsolete original part.

The TLV70218DBVR provides enhanced protection features including reverse polarity protection and under-voltage lockout (UVLO), which are not present in the original device. The substitute operates across a wider temperature range (-40°C to 125°C versus -40°C to 85°C), providing additional margin for thermal applications.

Package compatibility requires PCB layout modification due to the transition from SC-70-5 to SOT-23-5 pinout. Both packages are 5-pin surface mount configurations with identical electrical pin assignments for the regulator function.

Frequently Asked Questions (FAQ)

Q: Can the TLV70218DBVR directly replace the PT7M8218B18CE without circuit modifications?

A: Electrical substitution is direct. The output voltage, current rating, input voltage range, and control features are identical. PCB layout modification is required due to different package footprints (SC-70-5 versus SOT-23-5), though pin assignments remain functionally equivalent.

Q: What is the impact of the higher dropout voltage in the TLV70218DBVR?

A: The TLV70218DBVR specifies 0.38V dropout at full 300mA output current, compared to 0.18V typical for the PT7M8218B18CE at 150mA. This difference is application-dependent and should be evaluated against your minimum input voltage requirements and thermal budget.

Q: Are there differences in protection features between these parts?

A: The TLV70218DBVR includes reverse polarity protection and under-voltage lockout (UVLO) in addition to the over-current and over-temperature protection present in both devices. These additional features enhance system robustness.

Q: What is the temperature operating range difference?

A: The PT7M8218B18CE operates from -40°C to 85°C, while the TLV70218DBVR extends to 125°C. The substitute part provides wider thermal margin for high-temperature applications.

Q: Is the substitute part readily available?

A: The TLV70218DBVR is in active production status with substantial inventory availability. The original PT7M8218B18CE is obsolete, making the substitute the recommended path for new designs and production continuity.

Q: Do both parts have identical quiescent current specifications?

A: Quiescent current is nearly identical: 50 µA for the PT7M8218B18CE and 55 µA for the TLV70218DBVR. This difference is negligible for most applications.

Q: How do the PSRR specifications compare?

A: The PT7M8218B18CE specifies 75dB PSRR at 1kHz, while the TLV70218DBVR specifies 68dB at 1kHz. Both values are suitable for typical linear regulator applications, though the original part provides slightly better noise rejection.