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Analog Devices LTC4251BIS6-1#TRMPBF — Analog & Data Acquisition

LTC4251BIS6-1#TRMPBF Hot Swap Controller, -48V, TSOT-23-6

MPNLTC4251BIS6-1#TRMPBF
End of Life

Linear Technology LTC4251BIS6-1#TRMPBF, Hot Swap Controller, -48V, 1-channel, no internal switch, SOT-23-6 Thin/TSOT-23-6, -40°C to 85°C, Tape & Reel.

$6.47Ref. price · indicative, final on quote
Analog Devices LTC4251BIS6-1#TRMPBF datasheet (PDF)
PackagingSOT-23-6 Thin, TSOT-23-6
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LTC4251BIS6-1#TRMPBF specifications
ParameterValue
TypeHot Swap Controller
MountingSurface Mount
Voltage-72V ~ -36V
Current - supply800 µA
Operating temperature-40°C ~ 85°C
PackageTape & Reel (TR); Cut Tape (CT)
FeaturesLatched Fault
Applications-48V
CaseSOT-23-6 Thin, TSOT-23-6
Internal switchNo
Channels1
Programmable featuresCircuit Breaker, Current Limit, Fault Timeout, OVP, UVLO

Product details

-48V hot swap controller in a TSOT-23-6

The LTC4251BIS6-1#TRMPBF is a single-channel hot swap controller from Linear Technology, designed to manage inrush current and provide fault protection on -48V power rails. It operates over a supply range of -72V to -36V, covering the standard telecom -48V bus with margin for transients. The controller does not integrate the pass MOSFET — an external N-channel FET handles the current path, which lets the designer size the FET to the load current and thermal budget. Programmable features include circuit breaker threshold, current limit, fault timeout, undervoltage lockout (UVLO), and overvoltage protection (OVP), all set with external resistors and capacitors.

External MOSFET — BOM planning

An external N-channel MOSFET is required; the controller's 800 µA supply current is the controller-only draw.

The ROHS3 compliance and industrial temperature grade make it a straightforward drop-in for most -48V designs.

Frequently asked questions

Does LTC4251BIS6-1 require an external MOSFET or is it integrated?

An external N-channel MOSFET is required — the controller has no internal switch. The gate drive is designed for standard logic-level or standard-threshold FETs.

What are the programmable fault features of LTC4251BIS6-1?

The controller offers programmable circuit breaker threshold, current limit, fault timeout, overvoltage protection (OVP), and undervoltage lockout (UVLO). Faults latch off until the input is cycled.

What is the difference between LTC4251 and LTC4252?

The LTC4251 series (including this -1 variant) offers latched fault behavior, while the LTC4252 series typically offers auto-retry or timed restart. Both are -48V hot swap controllers with similar programmable features, but the fault response differs. For this part, the latched fault is the key distinction — it stays off after a fault until power is cycled.