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Analog Devices Inc./Maxim Integrated MAX4685ETB-T
- Part No.:
- MAX4685ETB-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX4685ETB-T.pdf
- Description:
- DUAL SPDT ANALOG SWITCHES
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX4685ETB-T from Maxim Integrated is a low-voltage, dual single-pole/double-throw (SPDT) analog switch with 0.8Ω max on-resistance for both NO and NC paths at +2.7V supply, 50ns turn-on time, and 1.8V–5.5V single-supply operation. It serves as a rail-to-rail signal routing device in portable audio and power management circuits.
For engineers reviewing the MAX4685ETB-T datasheet, MAX4685ETB-T pinout, MAX4685ETB-T application, or MAX4685ETB-T equivalent, key selection criteria include guaranteed 0.8Ω RON matching across channels, break-before-make timing (2ns), 1.8V logic compatibility, and UCSP/QFN package footprint constraints for space-constrained designs.
Technical Context
The MAX4685ETB-T implements two independent SPDT switches with symmetrical 0.8Ω max RON on both NO and NC paths at +2.7V, enabling balanced signal routing in bidirectional audio and sensor interfaces. Its break-before-make architecture prevents momentary shorting during state transitions.
It operates over +1.8V to +5.5V with rail-to-rail analog signal handling, 1.8V logic-compatible digital inputs, and ultra-low leakage (±1nA at +25°C). The device is fully specified for +3V nominal systems and supports fast switching (tON = 50ns, tOFF = 40ns) under 50Ω/35pF load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RON (NO/NC) | 0.8Ω max at +2.7V - ensures minimal insertion loss in audio and precision signal paths |
| RON Match | 0.06Ω max - enables matched gain/attenuation across dual channels in stereo or differential routing |
| tON/tOFF | 50ns/40ns max at +3V - supports high-speed multiplexing in data acquisition and communication interfaces |
| Supply Range | +1.8V to +5.5V - compatible with Li-ion battery, 3.3V, and 5V system rails without level-shifting |
| Logic Compatibility | 1.8V input thresholds (VIL = 0.5V, VIH = 1.4V) - interoperable with low-voltage microcontrollers and FPGAs |
| Off-Isolation | −64dB at 100kHz - suppresses crosstalk between active and inactive signal paths in multi-channel systems |
| THD | 0.03% - preserves fidelity in audio routing applications such as headset switching and MP3 players |
Pinout & Package
MAX4685ETB-T uses a 10-pin Thin QFN (3mm × 3mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is marked by a dot; the package is RoHS-compliant and rated for −40°C to +85°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive supply input - must be applied before analog signals to prevent latch-up |
| 2 | NO2 | Normally open terminal of Switch 2 - connects to COM2 when IN2 = logic high |
| 3 | COM2 | Common terminal of Switch 2 - bidirectional signal path shared with NO2 and NC2 |
| 4 | IN1 | Digital control input for Switch 1 - active-high, 1.8V logic compatible |
| 5 | NC1 | Normally closed terminal of Switch 1 - connects to COM1 when IN1 = logic low |
| 6 | GND | Analog/digital ground reference - must be low-impedance and tied to PCB ground plane |
| 7 | NC2 | Normally closed terminal of Switch 2 - connects to COM2 when IN2 = logic low |
| 8 | IN2 | Digital control input for Switch 2 - independent of IN1; enables dual-channel asynchronous control |
| 9 | COM1 | Common terminal of Switch 1 - bidirectional signal path shared with NO1 and NC1 |
| 10 | NO1 | Normally open terminal of Switch 1 - connects to COM1 when IN1 = logic high |
Key Features
| Feature | Design Value |
|---|---|
| Break-before-make switching | 2ns delay prevents signal shorting during channel transition - critical for relay replacement and power routing |
| RON flatness | 0.35Ω max over full signal range - maintains consistent gain/loss across rail-to-rail analog inputs |
| Low charge injection | 200pC max - minimizes voltage glitches at COM nodes in sample-and-hold or ADC front-end applications |
| Ultra-low leakage | ±1nA max at +25°C - preserves signal integrity in high-impedance sensor and medical monitoring circuits |
| Low crosstalk | −68dB at 100kHz - isolates adjacent channels in multi-signal routing like PCMCIA or communications circuits |
Applications
| Speaker Headset Switching | MP3 Player Signal Routing |
|---|---|
|
Use Scenario: Dynamically routes audio output between internal speaker and 3.5mm headset jack in portable media players. IC Role / Device Role / Timing Role: Dual SPDT analog switch controlling bidirectional audio paths with simultaneous mute/unmute sequencing. Use Value: 0.8Ω RON ensures minimal volume loss; break-before-make prevents audible pop/click during jack insertion. |
Use Scenario: Selects between stereo DAC outputs and line-out/headphone amplifiers in battery-powered MP3 players. IC Role / Device Role / Timing Role: Low-leakage, rail-to-rail analog multiplexer enabling clean signal path selection without DC offset. Use Value: 0.03% THD preserves audio fidelity; 1.8V logic compatibility allows direct interface with low-power SoCs. |
| Power Routing in Wearables | Relay Replacement in Industrial Sensors |
|
Use Scenario: Routes power from primary Li-ion battery or USB input to system rails in compact wearable devices. IC Role / Device Role / Timing Role: Low-RON analog switch acting as solid-state power selector with fast enable/disable control. Use Value: 0.8Ω RON limits voltage drop (<240mV at 300mA); 50ns switching supports dynamic power mode transitions. |
Use Scenario: Replaces electromechanical relays in 4–20mA loop-powered sensor transmitters requiring long-term reliability. IC Role / Device Role / Timing Role: High-isolation, low-leakage analog switch providing fail-safe signal path selection in harsh environments. Use Value: −64dB off-isolation blocks noise coupling; ±1nA leakage avoids current-loop error accumulation over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4684ETB-T | Asymmetrical RON: 0.5Ω (NC), 0.8Ω (NO) at +2.7V - optimized for unbalanced loads like speaker/headset pairs | Better suited for applications requiring differential impedance matching, e.g., mono speaker + stereo headset | Select MAX4684ETB-T when NC/NO path performance asymmetry improves system-level THD or SNR |
| TMUX1574PWR | 0.5Ω RON, 3.3V–5.5V supply only, no 1.8V logic support - higher supply minimum, tighter RON spec | Targeted at industrial 3.3V/5V systems; lacks low-voltage logic compatibility required for portable designs | Choose TMUX1574PWR only if operating exclusively above 3.3V and needing sub-0.5Ω RON stability |
Compared with MAX4684ETB-T and TMUX1574PWR, the MAX4685ETB-T provides symmetrical 0.8Ω RON across both switch paths and full 1.8V–5.5V operation - making it optimal for dual-channel, battery-powered audio and power routing where balanced performance and wide supply flexibility are essential.
Availability
MAX4685ETB-T is available at Aetrix Electronics and suitable for speaker headset switching, MP3 player signal routing, and power routing applications requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX4685ETB-T 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and portable applications.
The MAX4685ETB-T belongs to Maxim's low-voltage analog switch family, engineered specifically for space-constrained, battery-operated equipment requiring rail-to-rail signal integrity, ultra-low leakage, and fast, glitch-free switching.
FAQ
What is the maximum supply voltage rating for MAX4685ETB-T?
The MAX4685ETB-T has an absolute maximum supply voltage (V+) of +6V, but its operational range is specified from +1.8V to +5.5V. Exceeding +6V risks permanent damage per the Absolute Maximum Ratings table. For reliable long-term operation, keep V+ ≤ +5.5V and ensure proper power-supply sequencing - apply V+ before analog signals.
Does MAX4685ETB-T support rail-to-rail analog signal operation?
Yes, the MAX4685ETB-T supports true rail-to-rail analog signal handling: signals from GND to V+ pass through the switch with minimal RON variation (flatness ≤ 0.35Ω). This is confirmed in the Typical Operating Characteristics plots and Electrical Characteristics tables, enabling full-swing audio and sensor signal routing without clipping or distortion.
What is the logic threshold compatibility of MAX4685ETB-T inputs?
The MAX4685ETB-T digital inputs are 1.8V logic-compatible: VIL = 0.5V max and VIH = 1.4V min at +2.7V to +3.3V supply. Inputs tolerate up to +5.5V regardless of V+, allowing direct interfacing with 1.8V, 3.3V, or 5V controllers without external level shifters - a key feature verified in the Electrical Characteristics section.
How does the break-before-make timing of MAX4685ETB-T prevent signal corruption?
The MAX4685ETB-T guarantees a 2ns minimum break-before-make delay (tBBM) between switch transitions. This ensures the previously connected path (e.g., NC) fully disconnects before the new path (e.g., NO) closes - eliminating momentary shorts that cause audible pops in audio or transient spikes in power routing. Measured under 50Ω/35pF load, this behavior is validated in Figure 3 of the datasheet.
Is MAX4685ETB-T pin-compatible with MAX4684ETB-T?
Yes, MAX4685ETB-T and MAX4684ETB-T share identical 10-pin Thin QFN packaging, pinout, and footprint (T1033-1 variation). They differ only in internal switch characteristics: MAX4684ETB-T has asymmetrical RON (0.5Ω NC / 0.8Ω NO), while MAX4685ETB-T offers symmetrical 0.8Ω RON on both paths - enabling drop-in replacement where balanced performance is required.
MAX4685ETB-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Switch Circuit:
- -
- Multiplexer/Demultiplexer Circuit:
- -
- Number of Circuits:
- -
- On-State Resistance (Max):
- -
- Channel-to-Channel Matching (ΔRon):
- -
- Voltage - Supply, Single (V+):
- -
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- -
- -3db Bandwidth:
- -
- Charge Injection:
- -
- Channel Capacitance (CS(off), CD(off)):
- -
- Current - Leakage (IS(off)) (Max):
- -
- Crosstalk:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX4685ETB-T FAQ
1.How can I place an order for MAX4685ETB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4685ETB-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX4685ETB-T reliable?
The price and inventory of MAX4685ETB-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4685ETB-T is usually 5 days.
3.What payment methods are accepted for MAX4685ETB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4685ETB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4685ETB-T?
MAX4685ETB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4685ETB-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX4685ETB-T?
For technical support, including MAX4685ETB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4685ETB-T requirements.
6.How does Aetrix verify that MAX4685ETB-T is sourced from the original manufacturer or authorized distributors?
All MAX4685ETB-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX4685ETB-T meets industry standards.
7.What is the process for return or replacement of MAX4685ETB-T?
All MAX4685ETB-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4685ETB-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX4685ETB-T part is unused and in its original packaging.
Return procedure for MAX4685ETB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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