MAX14571EUD/V+ - Adj. OVP/OCP ±40V, 4.2A, 14-TSSOP-EP | Analog Devices
MPN: MAX14571EUD/V+ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.45 | $3.45 |
| 10 | $3.05 | $30.50 |
| 100 | $2.55 | $255.00 |
| 500 | $2.2 | $1,100.00 |
| 1,000 | $1.95 | $1,950.00 |
MAX14571EUD/V+ Overview
An overvoltage protection (OVP) IC is a hot-swap / power-distribution switch that disconnects a downstream load from the input rail when the input exceeds a programmable threshold or when the load current exceeds a programmable limit. OVP ICs sit in the system hierarchy between discrete protection (TVS, fuse) and full PMICs: they add active, re-settable behaviour without the size or cost of a complete PMU, and they protect downstream DC-DC converters, batteries and microcontrollers from inductive transients and load-dump events.
Key features include: ±40 V positive/negative input fault tolerance, 100 mΩ (typ) internal RON FET, programmable OVLO (max 33 V) and UVLO thresholds, programmable current limit up to 4.2 A with 20.7 ms (typ) blanking time, automatic retry behaviour, reverse-current blocking, and thermal-shutdown protection. The integrated MOSFET eliminates the need for an external power switch in most 4.2 A paths.
The MAX14571 uses a back-to-back MOSFET topology that blocks both forward and reverse current flow when disabled. The blanking-time circuit masks inrush transients during startup so the current limiter does not false-trip on capacitive loads. The autoretry behaviour restarts the output after the retry period, which simplifies recovery from transient faults.
Typical applications include USB-C PD and 5 V/12 V/24 V industrial rail protection, PLC I/O protection, load-dump protection in 24 V automotive systems, battery hot-swap, and protection of downstream point-of-load (POL) converters and microcontrollers.
The MAX14571EUD/V+ variant is the automotive-grade (-40°C to +125°C) over the base MAX14571EUD+; for latched-off behaviour use MAX14572; for continuous-current limiting only use MAX14573. All three share the same 14-TSSOP-EP pinout.
This page synthesizes distributor pricing (as of 2026-10-20), drop-in TSSOP-EP alternatives, and practical design notes that are not reproduced in the manufacturer datasheet.
Drop-in alternatives for MAX14571EUD/V+ — 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:
MAX14572EUD/V+
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX14573EUD/V+
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX14571EUD/V+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX14571EUD+T
✅ Drop-In📋 Reference alternative (not in catalog)
TPS2660PWPR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS26602PWPR
✅ Drop-In📋 Reference alternative (not in catalog)
MAX14571EUD/V+ Specifications
| Function | Adjustable Overvoltage / Overcurrent Protection IC |
| Input Voltage Operating Range | 4.5 V to 36 V |
| Input Voltage Fault Tolerance | ±40 V (positive and negative) |
| Internal FET RON (typ) | 100 mΩ |
| Adjustable OVLO Range | up to 33 V (typ threshold) |
| Undervoltage Threshold | 19.2 V (typ) |
| Overvoltage Threshold | 33 V (typ) |
| Programmable Current Limit | up to 4.2 A |
| Current-Limit Blanking Time | 20.7 ms (typ) |
| Reverse-Current Blocking | Yes |
| Thermal Shutdown | Yes |
| Topology | Back-to-back internal MOSFETs |
| Fault Behaviour | Auto-retry after blanking time (MAX14571) |
| Package | 14-TSSOP-EP (4.4 mm width, exposed pad) |
| Operating Temperature Range | -40 °C to +125 °C (automotive / /V grade) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
MAX14571EUD/V+ Pin Configuration
| Pin 1 | IN — Input voltage / power source |
| Pin 2 | IN — Input voltage / power source |
| Pin 3 | GND — Ground |
| Pin 4 | EN — Enable / UVLO input |
| Pin 5 | OVLO — Overvoltage threshold set / disable |
| Pin 6 | SETI — Current-limit set resistor |
| Pin 7 | TIMER — Blanking-time / retry capacitor |
| Pin 8 | FLAG — Fault indicator (open-drain) |
| Pin 9 | OUT — Output to load |
| Pin 10 | OUT — Output to load |
| Pin 11 | OUT — Output to load |
| Pin 12 | OUT — Output to load |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
Typical Applications
MAX14571EUD/V+ is suitable for 6 applications: USB-C PD and 5 V/12 V/20 V Hot-Swap Protection, Industrial 24 V PLC I/O Protection, 24 V Automotive Load-Dump Protection, Battery Hot-Swap / Field Replaceable Module, Protection of Point-of-Load (POL) DC-DC Converters, IoT / Sensor Hub Power Switch with Fault Logging.
USB-C PD and 5 V/12 V/20 V Hot-Swap Protection
The MAX14571EUD/V+ protects USB-PD controllers and downstream loads against ±40 V transients, hot-plug inrush, and over-current faults on VBUS. Its 100 mΩ internal FET keeps the rail drop under 0.42 V at 4.2 A — adequate for 5 V/3 A Type-C without thermal runaway on standard 1 oz copper. Placed in series with VBUS ahead of the PD controller's sink path, the device's 20.7 ms blanking time masks the bulk-cap charging transient so the limiter does not false-trip. Behaviour difference vs TI TPS2660: ±40 V vs ±60 V tolerance, 4.2 A vs 6 A continuous — verify your PD contract voltage fits within ±40 V.
Recommended
Industrial 24 V PLC I/O Protection
On a 24 V industrial PLC input, the MAX14571EUD/V+ blocks the load when the rail exceeds 33 V (programmable OVLO) and survives ±40 V motor back-EMF transients. The 100 mΩ internal FET keeps dissipation to ~0.42 W at 100 mA sensor load, and the auto-retry behaviour lets the module recover after a transient fault without service intervention. Pair it with an upstream TVS rated for energy above the auto-retry duty cycle. Auto-retry is the right answer for unattended industrial racks where a latched condition would require a field technician.
Recommended
24 V Automotive Load-Dump Protection
On a 24 V truck rail, the MAX14571EUD/V+ blocks the +40 V ISO 7637-2 load-dump pulse and -40 V reverse-battery event in a single device, removing the need for a series ideal-diode plus TVS pair. The -40 °C to +125 °C /V temperature grade suits under-hood environments; the 14-TSSOP-EP footprint exposes the thermal pad for sustained 4.2 A duty at 30 °C ambient. Estimated: with 1 oz copper on a 1 square-inch exposed-pad copper pour, junction-to-ambient is ~38 °C/W — adequate for ~1.6 W dissipation before derating. Choose MAX14571EUD/V+ (auto-retry) for rider-comfort loads, MAX14572EUD/V+ (latched) for safety circuits.
Recommended
Battery Hot-Swap / Field Replaceable Module
The MAX14571EUD/V+ sits on the load side of a battery disconnect to limit inrush to 4.2 A and to block reverse discharge when a freshly inserted battery is at lower voltage than the rail. Its back-to-back MOSFET topology blocks reverse current when disabled, eliminating one of the discrete parts a discrete hot-swap design would need. The 20.7 ms blanking time masks bulk-cap charging while still protecting against bolted faults. Recommended: use SETI to limit inrush to 70% of the connector's current rating to keep cycles within spec.
Recommended
Protection of Point-of-Load (POL) DC-DC Converters
On a multi-rail board, the MAX14571EUD/V+ protects downstream POL regulators (buck, buck-boost) from upstream over-voltage that would exceed their absolute-maximum input rating. Set OVLO ~5-10% below the POL's abs-max, and the auto-retry behaviour restores power after a transient without host intervention. The 100 mΩ internal FET adds ~0.1 V drop at 1 A — within the budget of most 3.3 V/5 V downstream regulators. Verify the upstream converter's soft-start is longer than 20.7 ms to avoid false blanking-time trips during normal power-up.
Recommended
IoT / Sensor Hub Power Switch with Fault Logging
In an IoT edge node, the MAX14571EUD/V+ provides OV/OC protection with auto-retry for unattended deployments where field service is impractical. The FLAG pin can drive an MCU interrupt to log a fault timestamp before the auto-retry restores power. The wide operating range (4.5-36 V) accepts a broad mix of solar, battery and bus-powered inputs without external bias generation. The 14-TSSOP-EP footprint gives enough copper area for sustained 1-2 A loads typical of sensor hubs. Estimated: 0.1 W internal dissipation at 1 A is well within the package's thermal envelope.
Recommended
Recommended Products Summary
Engineering reference data for MAX14571EUD/V+ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX14572EUD/V+ | MAX14573EUD/V+ | MAX14571EUD/V+T | MAX14571EUD+T | TPS2660PWPR | TPS26602PWPR |
|---|---|---|---|---|---|---|---|
| Package | 14-TSSOP-EP | 14-TSSOP-EP (same) | 14-TSSOP-EP (same) | 14-TSSOP-EP (same) | 14-TSSOP-EP (same) | 14-HTSSOP (PWP, similar 4x6.4 mm envelope) | 14-HTSSOP (PWP, similar footprint) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Input Voltage Operating Range | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 60 V | 4.5 V to 60 V |
| Fault Tolerance | ±40 V | ±40 V | ±40 V | ±40 V | ±40 V | ±60 V | ±60 V |
| Internal FET RON (typ) | 100 mΩ | 100 mΩ | 100 mΩ | 100 mΩ | 100 mΩ | ~50 mΩ | ~50 mΩ |
| Current Limit (max) | 4.2 A (programmable) | 4.2 A | 4.2 A | 4.2 A | 4.2 A | 6 A | 6 A |
| Fault Response | Auto-retry (20.7 ms blanking) | Latched off | Continuous current limit | Auto-retry (identical silicon) | Auto-retry (identical silicon) | Auto-retry | Latched off |
| Operating Temperature | -40 °C to +125 °C (automotive /V) | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | 0 °C to +70 °C (commercial grade) | -40 °C to +125 °C | -40 °C to +125 °C |
| Unit Price (approx., qty 1, USD) | 3.45 | ~3.45 (same family) | ~3.45 (same family) | ~3.45 (reel packaging) | ~3.20 (commercial grade) | ~3.90 | ~4.10 |
Key Differentiators
- ±40 V bi-directional fault tolerance (positive AND negative) (vs TPS2660PWPR)
- 100 mΩ internal MOSFET in 14-TSSOP-EP — no external FET (vs LTC4368 controller + external N-FET)
- Three fault-response variants in identical pinout (auto-retry, latched, continuous) (vs MAX14571 vs MAX14572 vs MAX14573)
Design Notes
Estimated: at 4.2 A continuous load, the 100 mΩ internal FET dissipates ~1.76 W. With a 14-TSSOP-EP footprint on standard 1 oz copper (theta_JA ~38 °C/W on a 1 sq-in exposed-pad copper pour), the junction temperature rises ~67 °C above ambient — adequate for 70 °C environments before derating. For continuous operation above 70 °C ambient, increase the copper pour to 2-3 sq-in or specify a higher-grade part with lower RON. Verify with a thermal-coupon measurement on the actual PCB stack-up.
Place IN, OUT and GND decoupling (1 μF X7R minimum) directly at the relevant pins with short, wide traces. Connect the exposed pad to a continuous copper plane on top and inner layers with at least 5 thermal vias (8-12 mil drill, 1 oz plating) to keep junction temperature in spec at 4.2 A. Keep SETI, TIMER and FLAG traces short and away from switching nodes to avoid coupling. Per Analog Devices application notes, do not connect NC pins to the GND plane — they should remain floating.
Do not set OVLO above the absolute-maximum rating of downstream devices, leaving margin for tolerance. Set current limit 30-40% above the load's nominal draw to avoid false trips on inrush. Choose auto-retry (MAX14571) vs latched (MAX14572) based on the system's recovery policy — swapping part numbers is not a firmware change. The TIMER capacitor value sets blanking time and retry period; using the wrong value can cause both false trips and slow recovery.
The 100 mΩ internal FET requires careful PCB layout to avoid false tripping from voltage transients on the OUT node. Use Kelvin-sense routing for SETI so trace resistance does not introduce current-limit error. Place the TIMER capacitor close to the IC with a short return to GND. Per manufacturer datasheet layout example, keep the IN and OUT planes separate to avoid inrush transients feeding back into the input source. Do not route FLAG near switching signals without a guard trace.
Compliance Information
ROHS3 Compliant per DigiKey product listing and microchipusa.com listing. Automotive-grade /V suffix supports -40 °C to +125 °C operating range; AEC-Q100 qualification status is not explicitly listed in the manufacturer web data provided, so aec_q100 is conservatively set to not_applicable — confirm with Analog Devices if automotive PPAP documentation is required for your program.
