ELM18801BA MOSFET — Specifications & Equivalents
About the ELM18801BA
The ELM18801BA is a P-channel MOSFET with a drain–source voltage (VDS) rating of 20 V, a continuous drain current (ID) of 4.7 A and an on-resistance (RDS(on)) of 0.042 Ω. It can dissipate up to 1.4 W and is rated to a junction temperature of 150 °C. It is supplied in the TSSOP-8 package.
At a glance
- Type: P-channel MOSFET
- Max drain–source voltage (VDS): 20 V
- Max continuous drain current (ID): 4.7 A
- On-resistance (RDS(on)): 0.042 Ω
- Power dissipation (PD): 1.4 W
- Max junction temperature (TJ): 150 °C
- Package: TSSOP-8
Typical applications
With its 20 V drain–source rating the ELM18801BA sits in the very-low-voltage class of switching MOSFETs, typically found in battery protection and power-path switching, point-of-load converters and logic-level load switching in portable devices.
The low 0.042 Ω on-resistance keeps conduction loss down, which suits synchronous rectification and continuous high-current paths.
Gate drive and switching notes
Keep gate–source voltage within the ±8 V maximum; exceeding it punctures the gate oxide and destroys the device permanently.
Switching behaviour is characterised by a rise time of 17 ns and an output capacitance (Coss) of 205 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.
Choosing a replacement for the ELM18801BA
A drop-in substitute for the ELM18801BA must be the same P-channel type and offer a drain–source rating of at least 20 V, a continuous drain current rating of at least 4.7 A and an on-resistance no higher than 0.042 Ω if efficiency and heat matter.
Mechanically, check the replacement against the TSSOP-8 footprint and confirm the pin order — parts sharing a package outline do not always share a pinout.
Where the application switches inductive loads or runs near the voltage limit, keep extra headroom rather than choosing a part that only just meets the original numbers.
Frequently asked questions
What is the ELM18801BA?
The ELM18801BA is a P-channel MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 20 V drain-source and 4.7 A continuous drain current.
What is the maximum voltage of the ELM18801BA?
The ELM18801BA has a maximum drain-source voltage (Vds) of 20 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.
How much current can the ELM18801BA handle?
It is rated for 4.7 A of continuous drain current, with power dissipation limited to 1.4 W. Real-world capability depends on your heatsinking and ambient temperature.
What is the on-resistance of the ELM18801BA?
On-resistance (Rds(on)) is 0.042 Ω. Multiply by the square of your load current to estimate conduction loss.
What package does the ELM18801BA come in?
It is listed in TSSOP-8. Verify the pinout of the specific variant, as one outline can carry different pin assignments.
What can I use to replace the ELM18801BA?
No verified equivalents are listed yet. Choose a part of the same polarity that meets or exceeds every rating above and shares a compatible package and pinout.
Key Specifications
| Type | MOSFET |
|---|---|
| Channel Type | P -Channel |
| Drain-Source Voltage (Vds) | 20 V |
| Gate-Source Voltage (Vgs) | 8 V |
| Drain Current (Id) | 4.7 A |
| Drain-Source On-Resistance (Rds) | 0.042 |
| Rise Time (tr) | 17 nS |
| Output Capacitance (Coss) | 205 pF |
| Junction Temperature (Tj) | 150 °C |
| Package | TSSOP-8 |
| Power Dissipation (Pd) | 1.4 W |
Equivalent & Replacement Parts
No verified equivalents are listed for ELM18801BA yet.