Analog Devices Inc. LTC4367CMS8-1#PBF

Overview

LTC4367CMS8-1#PBF from Analog Devices is a high-voltage overvoltage, undervoltage, and reverse supply protection controller for 2.5V–60V input systems. It controls back-to-back N-channel MOSFETs to block faults up to +100V and –40V, features 500µs fast fault recovery, 70µA operating current, and operates in the 0°C to 70°C temperature range. It is used in automotive load-dump protection circuits where rapid reconnection after transient overvoltage is critical.

For engineers reviewing the LTC4367CMS8-1#PBF datasheet, LTC4367CMS8-1#PBF pinout, LTC4367CMS8-1#PBF application, or LTC4367CMS8-1#PBF equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior (500µs turn-on delay), gate drive characteristics referenced to VOUT, and validated alternative options for industrial and automotive power rail protection.

Technical Context

The LTC4367CMS8-1#PBF implements dual precision comparators (UV/OV) with 0.5V thresholds, 25mV hysteresis, and 1µs propagation delay to detect input excursions outside user-defined windows. Its internal charge pump delivers up to 13.1V gate enhancement above VOUT, enabling low-R_DS(on) N-channel MOSFETs without external bias.

Unlike the standard LTC4367, the "-1" variant replaces the 32ms GATE turn-on delay with a 500µs delay-critical for applications requiring rapid restoration after brief surges. Reverse protection is achieved by dynamically connecting GATE to VIN when negative voltage is detected, forcing M2 into cutoff while leveraging body diode isolation.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic MSOP (MS8), 3.0mm × 3.0mm footprint, exposed pad optional for thermal relief. RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar overvoltage/undervoltage protection applications.

Compared with TPS26631PWPR and MAX14749AETB+, the LTC4367CMS8-1#PBF uniquely combines –40V reverse blocking, 100V overvoltage tolerance, and sub-millisecond recovery-enabling robust, compact protection in space-constrained automotive and industrial edge nodes where both surge resilience and fast reconnection matter.

Availability

LTC4367CMS8-1#PBF is available at Aetrix Electronics and suitable for automotive surge protection, industrial PLC power rails, portable instrumentation, and redundant telecom supply selection requiring stable component supply across production lifecycles.

Supply support for LTC4367CMS8-1#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving aerospace, automotive, industrial, and communications markets.

The LTC4367 family was designed specifically for high-reliability DC power path protection in harsh environments-delivering precision voltage window monitoring, reverse polarity immunity, and fast fault recovery in minimal footprint packages.

FAQ

What is the maximum continuous input voltage the LTC4367CMS8-1#PBF can withstand?

The LTC4367CMS8-1#PBF has an absolute maximum input voltage rating of –40V to +100V. This allows it to survive automotive load dump transients defined by ISO 7637-2 Pulse 5a without damage. Its functional operating range remains 2.5V to 60V, meaning sustained operation above 60V is not supported-only transient survival up to 100V is guaranteed. The LTC4367CMS8-1#PBF achieves this via ruggedized input ESD structures and internal clamping.

How does the LTC4367CMS8-1#PBF differ from the standard LTC4367CMS8#PBF?

The LTC4367CMS8-1#PBF replaces the standard part's 32ms GATE turn-on delay with a 500µs delay, enabling rapid reconnection after brief overvoltage events. All other specifications-including UV/OV thresholds, protection ranges, quiescent current, and pinout-are identical. The "-1" suffix denotes this single timing difference; no layout or bill-of-material changes are needed when upgrading from LTC4367CMS8#PBF to LTC4367CMS8-1#PBF.

Can the LTC4367CMS8-1#PBF protect against reverse battery connection in a 12V automotive system?

Yes-the LTC4367CMS8-1#PBF provides active reverse supply protection down to –40V. When VIN goes negative, its internal circuit connects the GATE pin directly to VIN, forcing the high-side N-channel MOSFET into cutoff while leveraging body diode isolation. This blocks reverse current flow without external diodes or P-MOSFETs. The LTC4367CMS8-1#PBF has been validated with –20V hot-swap tests showing no VOUT perturbation.

What external components are required to configure overvoltage and undervoltage thresholds for the LTC4367CMS8-1#PBF?

Each threshold requires a two-resistor divider from VIN to GND, with the tap connected to OV (for overvoltage) or UV (for undervoltage). For example, setting UV = 7V uses R1 = 121kΩ and R2 = 29.4kΩ (as shown in the LTC4367 datasheet Figure TA01a). The LTC4367CMS8-1#PBF's <10nA input leakage allows use of high-value resistors (e.g., 1MΩ range), minimizing current draw and heat generation in the divider network.

Does the LTC4367CMS8-1#PBF require an input capacitor or TVS diode for basic operation?

No-the LTC4367CMS8-1#PBF is explicitly designed to operate without input capacitors or TVS diodes in most applications. Its internal architecture handles fast transients (including 50Hz/60Hz AC blocking) and absorbs energy from moderate surges. However, for extreme cases like ISO 7637-2 Pulse 5b (high-energy 100V spike), a small ceramic capacitor (e.g., 100nF) near VIN is recommended for local decoupling-not surge suppression.