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ROHM Semiconductor BD48L42G-TL — Discrete Semiconductors

BD48L42G-TL Voltage Detector, 4.2V Threshold, Active Low

MPNBD48L42G-TL
End of Life

ROHM BD48Lxx series voltage detector, BD48L42G-TL, 4.2V threshold, active-low open-drain output, -40°C to 105°C, SOT-23-3 package.

$0.5Ref. price · indicative, final on quote
ROHM Semiconductor BD48L42G-TL datasheet (PDF)
PackagingTO-236-3, SC-59, SOT-23-3
RoHSROHS3 Compliant
SeriesBD48Lxx
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

BD48L42G-TL specifications
ParameterValue
TypeVoltage Detector
SeriesBD48Lxx
MountingSurface Mount
Voltage - threshold4.2V
Number of voltages monitored1
Operating temperature-40°C ~ 105°C (TA)
ResetActive Low
OutputOpen Drain or Open Collector
PackageTape & Reel (TR); Cut Tape (CT)
CaseTO-236-3, SC-59, SOT-23-3

Product details

4.2V monitor for industrial rails

The BD48L42G-TL is a single-channel voltage detector from ROHM's BD48Lxx series, monitoring a 4.2V threshold with an active-low, open-drain output. Rated for operation from -40°C to 105°C, it fits industrial environments such as motor drives, outdoor telecom equipment, and factory automation panels where the rail must be asserted before the system starts.

Open-drain output — wired-OR flexibility

The open-drain output lets the BD48L42G-TL pull the reset line low without sourcing current, making it suitable for mixed-voltage systems where the reset signal needs to be shared across multiple supervisors or pulled up to a different supply rail.

The three-pin footprint — VDD, GND, and open-drain output — keeps the board layout simple; no external pull-up resistor is needed if the downstream logic already has a pull-up on the line.

Frequently asked questions

Does BD48L42G-TL have an open-drain output?

Yes, the output is open drain or open collector, active low.

What package is BD48L42G-TL available in?

It is available in a surface-mount SOT-23-3 package (also TO-236-3, SC-59), with the supplier device package listed as 3-SSOP.

When sourcing BD48L42G-TL, what's the closest functional second-source?

The BD45422G-TR from the BD45xxx series is a voltage detector with active-low, open-drain output, but it has a 180ms minimum reset timeout and a different threshold voltage — confirm the threshold and timeout requirements before substituting.