LTC4414EMS8TR - 36V Low Loss PowerPath PFET Controller | ADI
MPN: LTC4414EMS8TR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.3 | $3.30 |
| 10 | $3.1 | $31.00 |
| 100 | $2.95 | $295.00 |
| 500 | $2.9 | $1,450.00 |
| 1,000 | $2.85 | $2,850.00 |
LTC4414EMS8TR Overview
An ideal diode controller is a type of power management IC that replaces a conventional rectifier diode with a MOSFET plus control circuit. In the power-supply hierarchy, it sits between raw power sources (wall adapters, batteries, backup supplies) and the system load, performing source ORing. Because a MOSFET conducts with only milliohms of on-resistance instead of a diode's 0.3V to 0.7V forward drop, the controller dramatically reduces conduction loss, self-heating, and the voltage drop that would otherwise steal headroom from downstream regulators.
Key features of the LTC4414 include its wide 3V to 36V operating range that covers 5V, 12V, 24V, and 28V industrial rails, its ability to drive large P-channel MOSFETs for multi-ampere power paths, and fast switchover that maintains uninterrupted load power when the primary source fails. Forward voltage across the conducting MOSFET is limited to only tens of millivolts, as illustrated by the forward-voltage characteristic in the manufacturer datasheet, versus hundreds of millivolts for a Schottky alternative.
Architecturally, the LTC4414 senses voltage across the external MOSFET and actively drives the gate to regulate forward drop, reverse-blocking when the input falls below the output. External gate clamping protects the PFET within its safe gate-source ratings across the full 36V input span, and the MSOP-8 footprint keeps the controller overhead minimal next to the power FET.
Typical applications include highly efficient ORing of multiple power sources for extended battery life, wall-adapter-to-battery switchover in portable and industrial equipment, redundant supply feeding in servers and telecom cards, and automotive/industrial 12V to 28V diode-OR combiner circuits.
When designing, size the external PFET for the load current and thermal environment, and keep the sense traces Kelvin-connected to the MOSFET terminals so millivolt-level regulation accuracy is preserved.
This page synthesizes distributor pricing, verified drop-in alternatives, design notes, and application guidance not found together in the manufacturer datasheet, with pricing references stated as of 2026-10-19.
Drop-in alternatives for LTC4414EMS8TR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC4414EMS8#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC4414EMS8#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC4414IMS8#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC4414IMS8#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC4414EMS8TR Specifications
| Function | Low Loss PowerPath Controller for Large P-channel MOSFETs (ideal diode / ORing) |
| Input Supply Voltage Range | 3 V to 36 V |
| Number of Supplies | 1 |
| Switch Topology | P-Channel MOSFET Source Selector, 2:1 |
| Operating Temperature Grade (E) | 0C to +85C (guaranteed) |
| Extended Temperature Characterization | -40C to +85C assured by design/characterization; I grade tested -40C to +125C |
| Package | MSOP-8 (Plastic), 8 pins |
| Mounting Type | Surface Mount |
| Forward Voltage Across PFET | Tens of mV when conducting (near-ideal diode behavior, per datasheet characteristic curve) |
| Product Status | Recommended for New Designs |
| 1ku List Price | Starting from $2.85 (as of 2026-10-19) |
| RoHS Status | Lead-free #PBF variant available (LTC4414EMS8#PBF); RoHS compliance of this suffix per ADI product page |
LTC4414EMS8TR msop-8 (plastic), 8 pins Pin Configuration Guide
Pin configuration for LTC4414EMS8TR (msop-8 (plastic), 8 pins package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for LTC4414EMS8TR.
Refer to the datasheet for full pin configuration.
Typical Applications
LTC4414EMS8TR is suitable for 6 applications: Wall Adapter to Battery Switchover, Redundant Power Supply ORing in Servers and Telecom Cards, Industrial 24V Battery Backup Combiners, Portable Battery-Powered Instrumentation, Automotive-Adjacent 12V Diode-OR Front Ends, Test and Measurement Instrument Power Inputs.
Wall Adapter to Battery Switchover
The LTC4414 drives an external P-channel MOSFET to switch a portable or industrial device seamlessly between a wall adapter and a backup battery. When the adapter is present, the PFET conducts with only tens of millivolts of forward drop (per the Analog Devices datasheet forward-voltage characteristic), feeding the load efficiently; when the adapter is removed, switchover is fast enough that the load rail is maintained, allowing a battery or bulk capacitor to ride through. Compared with a Schottky ORing diode dropping roughly 0.3V to 0.5V, the MOSFET path saves hundreds of milliwatts at multi-ampere loads, extending battery runtime and eliminating a heatsink. The 3V to 36V input range covers 5V USB adapters through 24V industrial bricks. Place the controller close to the PFET with Kelvin-sensed connections to preserve regulation accuracy.
Recommended
Redundant Power Supply ORing in Servers and Telecom Cards
In redundant-feed architectures where two -48V-derived or 24V/28V intermediate buses feed one card, the LTC4414 provides a low-loss ORing element per feed. Its 36V maximum input covers 24V and 28V intermediate buses with margin, and each controller drives a large P-channel MOSFET whose on-resistance sets the path current, enabling tens of amperes with proper FET selection. Forward drop of tens of millivolts keeps distribution loss and card self-heating far below diode-based ORing, improving rack-level energy efficiency. Fast MOSFET control isolates a failed or sagging feed before it drags down the combined rail. Use one LTC4414 channel per feed, Kelvin-route the sense lines to the FET drain and source, and verify the PFET's gate-source rating against the controller's gate drive across the full input span per the Analog Devices datasheet.
Recommended
Industrial 24V Battery Backup Combiners
Factory automation and process-control equipment commonly runs from a 24V PLC bus with a 24V battery or UPS as backup. The LTC4414's 3V to 36V operating range directly accommodates 24V nominal rails including charging transients, and its MSOP-8 footprint fits tightly beside the power MOSFET on crowded DIN-rail modules. During a main-power brownout, the controller steers the gate to prevent reverse current into the failed source while the backup carries the load, achieving near-zero-voltage switchover interruption. Because conduction loss scales with I-squared-R rather than a fixed diode drop, a 10-milliohm PFET at 5A dissipates roughly 0.25W (estimated), versus about 2.5W for a 0.5V Schottky diode, simplifying thermal design in sealed enclosures with no forced airflow.
Recommended
Portable Battery-Powered Instrumentation
Handheld meters, data loggers, and medical monitors benefit from the LTC4414's low quiescent overhead during single-supply power-path control. The near-ideal-diode action means the battery delivers more of its stored energy to the load instead of losing 0.3V to 0.7V per ORing diode, which at a 100mA average draw saves roughly 30-70mW continuously (estimated) - meaningful over weeks of sleep-dominated operation. The 8-pin MSOP-8 package suits compact two-layer boards, and the E-grade 0C to 85C guarantee matches typical indoor/portable environmental requirements. The controller's fast switchover keeps microcontroller rails alive during battery insertion or adapter unplugging events. Decouple both power sources close to the MOSFET to absorb transient energy during source transitions.
Recommended
Automotive-Adjacent 12V Diode-OR Front Ends
Truck and off-highway 12V/24V dual-battery systems and accessory ORing front ends benefit from the LTC4414's 36V tolerance, which covers load-dump-adjacent conditions within its ratings on clamped systems. Driving a large P-channel MOSFET, the controller replaces engine-compartment diode blocks that waste tens of watts: at 10A, a 0.6V diode junction dissipates about 6W (estimated), whereas a 5-milliohm FET dissipates 0.5W. The MSOP-8 controller's fast response blocks reverse current when an alternator output collapses, preventing battery cross-discharge. For cabin or chassis locations reaching below 0C or beyond 85C, select the LTC4414IMS8#PBF industrial grade, which is guaranteed and tested from -40C to +125C per the Analog Devices datasheet, using the same footprint and pinout.
Recommended
Test and Measurement Instrument Power Inputs
Bench instruments and field testers often accept multiple input sources - AC adapter, internal battery, and USB - and must prioritize them without back-feeding. One LTC4414 per source boundary creates a low-loss controlled diode chain: the conducting MOSFET's tens-of-millivolts drop preserves voltage headroom for precision analog rails, which directly improves measurement fidelity compared with diode ORing that erodes 0.4V or more. The 3V to 36V range accepts 9V, 12V, and 24V adapters alike. The controller's fast gate control also limits reverse-current transients when a source is hot-unplugged, protecting sensitive front-end circuitry. Keep the gate-drive loop short, place a small gate resistor to damp ringing, and review the Analog Devices datasheet application circuit for recommended PFET clamping.
Recommended
Recommended Products Summary
Engineering reference data for LTC4414EMS8TR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC4414EMS8#PBF | LTC4414EMS8#TRPBF | LTC4414IMS8#PBF | LTC4414IMS8#TRPBF |
|---|---|---|---|---|---|
| Package | MSOP-8 | MSOP-8 - same | MSOP-8 - same | MSOP-8 - same | MSOP-8 - same |
| Brand | Analog Devices (Linear Technology) | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Input Voltage Range | 3 V to 36 V | 3 V to 36 V | 3 V to 36 V | 3 V to 36 V | 3 V to 36 V |
| Guaranteed Temperature Range | 0C to +85C (E grade) | 0C to +85C (E grade) | 0C to +85C (E grade) | -40C to +125C (I grade) | -40C to +125C (I grade) |
| Function | 2:1 P-channel source selector / ideal diode ORing | Same | Same | Same | Same |
| Packaging | Tape & Reel (TR) | Tube | Tape & Reel | Tube | Tape & Reel |
Key Differentiators
- 36V input tolerance covers 24V/28V industrial rails (vs LTC4412 (functional family alternative))
- Extended-temperature drop-in option within the same footprint (vs LTC4414IMS8#PBF)
- Large-PFET drive capability for multi-ampere paths (vs LTC4414EMS8#PBF (same die, tube packaging))
Design Notes
Kelvin-route the MOSFET sense connections: run dedicated sense traces from the LTC4414 sense pin directly to the PFET drain and source terminals, not to shared power copper. Millivolt-level forward-drop regulation is corrupted by even a few milliohms of trace resistance at multi-ampere currents, causing the controller to drive the gate incorrectly and increasing conduction loss. Keep the gate-drive loop (controller gate pin to PFET gate, with the source return) short and compact to minimize ringing and EMI during fast switchover events.
Size the external P-channel MOSFET for the load current, not the controller - the LTC4414 itself dissipates very little. Estimated: a 10-milliohm PFET at 5A dissipates about 0.25W versus roughly 2.5W for a Schottky diode with 0.5V drop, so copper-pour thermal relief on the FET drain/source pads is usually sufficient. Verify the FET's Rds(on) at the actual gate-drive voltage provided by the controller at your minimum input voltage, since Rds(on) rises at low Vgs and at high junction temperature.
Observe gate-source voltage limits of the external PFET across the full 3V to 36V input span; use the gate clamp arrangement recommended in the Analog Devices LTC4414 datasheet application circuits so a 36V input does not overdrive a 20V-rated FET gate. Also confirm temperature-grade selection: the E suffix (this part) is guaranteed only from 0C to 85C per the datasheet - designs seeing sub-zero or above-85C conditions must use the LTC4414I grade, which is tested from -40C to +125C. Do not exceed the 36V absolute input ceiling on unclamped industrial lines.
Compliance Information
The original LTC4414EMS8TR suffix predates the #PBF lead-free designation; the lead-free LTC4414EMS8#PBF and LTC4414EMS8#TRPBF variants are listed by DigiKey as stocked OR-controller parts. RoHS/REACH status of this specific suffix should be confirmed on the ADI product page before specifying for RoHS-mandated production.
