MAX6816EUS+T - ±15kV ESD SOT-143-4 Switch Debouncer | Maxim
MPN: MAX6816EUS+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.86 | $0.86 |
| 10 | $0.77 | $7.70 |
| 100 | $0.65 | $65.00 |
| 500 | $0.55 | $275.00 |
| 1,000 | $0.47 | $470.00 |
| 3,000 | $0.39 | $1,170.00 |
MAX6816EUS+T Overview
A switch debouncer is a specialized interface IC that filters the mechanical contact bounce of switches, keypads, relays, or other electro-mechanical contacts so a downstream microcontroller or ASIC receives a single, deterministic logic transition. As a subcategory of supervisory / interface ICs, switch debouncers sit between the analog-mechanical input domain and the digital domain; they belong to the broader interface-IC hierarchy (specialized interface -> interface IC -> integrated circuit) and serve the same role as a hardware RC filter plus Schmitt trigger, but in a single chip.
Key features of the MAX6816EUS+T include a fixed 40 ms (typical) debounce qualification delay that removes both switch opening and closing bounce, ±15 kV HBM ESD protection on the switch input per IEC 61000-4-2 air-discharge testing, 2.7 V to 5.5 V single-supply operation, low 25 µA quiescent current, and a small SOT-143-4 outline. The output stage is a CMOS push-pull driver capable of sourcing/sinking several milliamps, so it can directly drive most CMOS logic families without an external pull-up resistor.
The MAX6816/MAX6817/MAX6818 family is fabricated on a low-power CMOS process with on-chip ESD cells and a precision timer block that sets the debounce interval without external capacitors. Compared to discrete RC + Schmitt debounce networks, the integrated timer is stable across temperature and removes the need for tuning. The MAX6818 (octal, 20-pin) is pin-compatible with the LS573 octal latch (except for the CH pin), giving a migration path for designers scaling from 1 channel to 8 channels.
Typical applications of the MAX6816EUS+T include membrane keypad interfaces, pushbutton reset circuits, industrial control panels, automotive body controllers, portable consumer electronics, and appliance front-panel switches. The compact SOT-143-4 footprint makes it suitable where board area is constrained.
When designing with this part, place a 0.1 µF decoupling capacitor within 5 mm of the VCC pin and keep the trace from the mechanical switch to the IN pin short to maximize ESD protection effectiveness. The output does not require a pull-up resistor.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes beyond what the manufacturer datasheet alone provides.
Drop-in alternatives for MAX6816EUS+T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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MAX6816EUS-T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX6816EUS+T
✅ Drop-In✓ In Stock
$0.39 / Unit
View Datasheet →MAX6816EUS+T Maximum Ratings & Electrical Characteristics
| Function | Single-channel CMOS switch debouncer |
| Supply Voltage (VCC) | 2.7 V to 5.5 V |
| Supply Current | 25 µA typical quiescent |
| Debounce Delay | 40 ms typical (fixed) |
| ESD Protection (Switch Input) | ±15 kV HBM (Human Body Model) |
| Number of Switch Inputs | 1 |
| Output Type | CMOS push-pull (no pull-up required) |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | SOT-143-4 |
| Mounting Type | Surface Mount |
| MSL Level | 1 (per JEDEC J-STD-020) |
| Lead-Free | Yes (per manufacturer product page) |
| RoHS Status | Compliant |
| Pin Count | 4 |
| Compatible Family Members | MAX6817 (dual), MAX6818 (octal) |
MAX6816EUS+T Pin Configuration
| Pin 1 | IN — Switch input (bouncing mechanical contact; ±15 kV HBM ESD-protected) |
| Pin 2 | GND — Ground |
| Pin 3 | OUT — Debounced CMOS push-pull output |
| Pin 4 | VCC — Supply voltage, 2.7 V to 5.5 V |
Typical Applications
MAX6816EUS+T is suitable for 6 applications: Membrane Keypad Interface, Pushbutton Reset Circuit, Industrial Control Panel Switches, Automotive Body Electronics, Portable Consumer Electronics, Appliance Front-Panel Switches.
Membrane Keypad Interface
The MAX6816EUS+T sits between a membrane keypad matrix and a microcontroller, removing the contact bounce that would otherwise cause false multi-press events. With ±15 kV ESD on the IN pin it survives fingertip discharge on exposed keypads, while the 40 ms internal debounce delay is fast enough for human input yet long enough to ignore mechanical settling. The SOT-143-4 footprint is small enough to place one debouncer per critical key without consuming board area, and the 25 µA quiescent current is negligible compared to the MCU's consumption.
Recommended
Pushbutton Reset Circuit
In pushbutton reset circuits the MAX6816EUS+T ensures a single, clean logic-low pulse to the MCU reset pin even when the user holds or jostles the button. The fixed 40 ms delay eliminates false resets from accidental contact while remaining fast enough for intentional user reset. The 2.7 V to 5.5 V supply range matches the rails used by 3.3 V and 5 V microcontrollers, and the CMOS push-pull output drives the reset pin directly with no pull-up resistor. The ±15 kV HBM ESD rating protects against static discharge through the button.
Recommended
Industrial Control Panel Switches
For factory-floor HMI panels with mechanical selector switches and pushbuttons, the MAX6816EUS+T provides a clean digital interface to PLC inputs or industrial controllers. Its -40 °C to +85 °C industrial temperature range covers most factory environments, and the integrated ±15 kV ESD protection reduces the need for external TVS components at every switch terminal. The 40 ms debounce interval is well-matched to operator-input timescales while rejecting vibration-induced chatter from heavy industrial equipment near the panel.
Recommended
Automotive Body Electronics
In automotive body controllers (door locks, window switches, mirror controls) the MAX6816EUS+T debounces noisy mechanical switches wired through the vehicle harness. The ±15 kV ESD rating tolerates the static and inductive transients typical of automotive wiring, and the -40 °C to +85 °C temperature range covers cabin and most under-hood locations. The 2.7 V to 5.5 V supply range aligns with 5 V regulated rails in BCM modules, and the 25 µA quiescent current contributes minimally to parasitic battery drain in always-on circuits.
Recommended
Portable Consumer Electronics
In handheld devices, wearables, and remote controls the MAX6816EUS+T provides reliable button debouncing while consuming only 25 µA of quiescent current, preserving battery life. The SOT-143-4 package measures only about 2.9 mm × 1.6 mm, fitting easily inside compact plastic enclosures where PCB area is at a premium. The 2.7 V lower supply limit allows operation directly from a single Li-ion cell (3.0 V to 4.2 V), and the CMOS push-pull output interfaces directly to low-power MCU GPIO without external components.
Recommended
Appliance Front-Panel Switches
Washing machines, microwave ovens, and HVAC control panels rely on the MAX6816EUS+T to debounce membrane and tactile switches that may be exposed to kitchen or laundry humidity and operator contact discharge. The ±15 kV ESD protection guards the switch inputs against repeated human contact, and the -40 °C to +85 °C operating range handles cold garages and hot equipment rooms. The single-channel SOT-143-4 package is small enough to mount adjacent to each critical button, and the 40 ms delay prevents chatter from vibration in adjacent rotating equipment.
Recommended
Recommended Products Summary
Engineering reference data for MAX6816EUS+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX6816EUS-T | MAX6816EUS+T (auto grade) |
|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) |
| Package | SOT-143-4 | SOT-143-4 - same | SOT-143-4 - same |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Quiescent Current | 25 µA | 25 µA | 25 µA |
| Debounce Delay | 40 ms | 40 ms | 40 ms |
| ESD Protection (HBM) | ±15 kV | ±15 kV | ±15 kV |
| Number of Channels | 1 | 1 | 1 |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C (AEC-Q100 qualified) |
Key Differentiators
- Integrated ±15 kV HBM ESD protection eliminates external TVS diodes (vs Discrete RC + Schmitt debounce network)
- Single 4-pin SOT-143-4 package versus 6-pin SOT-23 alternatives (vs MAX6826VUT+ (SOT-23-6))
- Fixed internally-trimmed 40 ms delay versus external RC timing (vs Discrete RC + Schmitt debounce network)
Design Notes
Place a 0.1 µF ceramic decoupling capacitor within 5 mm of the VCC pin (pin 4) of the MAX6816EUS+T. Keep the trace from the mechanical switch to the IN pin (pin 1) as short as possible to maximize the effectiveness of the ±15 kV HBM ESD protection. For multi-switch applications, place one MAX6816 adjacent to each critical switch rather than routing long noisy traces across the PCB.
Do not connect an external pull-up resistor to the OUT pin (pin 3) - the CMOS push-pull output stage provides both source and sink current and an external pull-up can cause contention. Do not connect the IN pin to voltages below ground or above VCC without current limiting; the input handles ±25 V transients but sustained overvoltage can damage the ESD cell. Do not omit the VCC decoupling capacitor - the 40 ms timer relies on clean supply voltage.
For cable lengths above 0.5 m between the mechanical switch and the MAX6816EUS+T IN pin, add a 10-100 Ω series resistor at the IN pin to dampen ringing and improve EMI immunity. Keep switch wiring away from switching power inductors and high-frequency clock traces. The MAX6816EUS+T provides robust input hysteresis, but very high dV/dt noise (above 10 kV/µs) can still cause false triggering on long unshielded cables.
Compliance Information
RoHS and lead-free per Maxim Integrated product page. Standard grade is not AEC-Q100 qualified; the MAX6816EUS/V+T variant is AEC-Q100 qualified for automotive applications.
