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Analog Devices Inc./Maxim Integrated MAX4685EBC-T
- Part No.:
- MAX4685EBC-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFBGA, CSPBGA
- Datasheet:
-
MAX4685EBC-T.pdf
- Description:
- IC SW SPDT-NO/NCX2 800MOHM 10CSP
- Quantity:
- Payment:
- Shipping:
Inventory:37,001
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Product details
Overview
MAX4685EBC-T from Maxim Integrated is a dual single-pole/double-throw (SPDT) analog switch IC designed for low-voltage signal routing in portable electronics. It features 0.8Ω max on-resistance for both NO and NC paths at +2.7V, 50ns turn-on time, 40ns turn-off time, and operates from +1.8V to +5.5V. It is used in audio path switching for cellular phones and MP3 players where rail-to-rail signal handling and low THD (0.03%) are critical.
For engineers reviewing the MAX4685EBC-T datasheet, MAX4685EBC-T pinout, MAX4685EBC-T application, or MAX4685EBC-T equivalent, key selection criteria include guaranteed 0.8Ω RON symmetry across both SPDT channels, 12-bump UCSP package footprint (2.0mm × 1.5mm), break-before-make timing (2ns), and 1.8V logic compatibility with 3.3V supply systems.
Technical Context
The MAX4685EBC-T implements two independent SPDT switches using BiCMOS process technology, each with matched NO/NC on-resistance (≤0.8Ω at +2.7V) and ≤0.06Ω RON match between channels. Its break-before-make architecture prevents signal shorting during state transitions, with tBBM = 2ns typical.
It supports bidirectional analog signal routing from GND to V+, maintains <0.35Ω RON flatness over full signal range, and delivers -64dB off-isolation and -68dB crosstalk at 100kHz - enabling clean audio and communication signal switching without channel interference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-Resistance (NO/NC) | 0.8Ω max at +2.7V - ensures minimal signal attenuation and voltage drop in battery-powered audio paths |
| RON Match (Channel-to-Channel) | 0.06Ω max - enables precise differential signal routing and balanced switching in stereo applications |
| Turn-On / Turn-Off Time | 50ns / 40ns at +3V - supports fast multiplexing in digital audio interfaces and modem signal routing |
| Supply Voltage Range | +1.8V to +5.5V - compatible with Li-ion, coin-cell, and 3.3V system rails without level-shifting |
| Logic Input Compatibility | 1.8V logic with VIH = 1.4V, VIL = 0.5V - interoperable with baseband processors and low-power MCUs |
| THD + Noise | 0.03% at 20Hz–20kHz - preserves fidelity in headset and speaker switching without audible distortion |
| Off-Isolation / Crosstalk | -64dB / -68dB at 100kHz - prevents leakage between active and inactive audio/video channels |
Pinout & Package
MAX4685EBC-T uses a 12-bump, 0.5mm-pitch wafer-level chip-scale package (UCSP) measuring 2.0mm × 1.5mm. The package has no leads; solder bumps form direct interconnects to PCB pads per JEDEC-standard layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC1, NC2 | Normally Closed Analog Terminal | Direct connection to COMx when INx = low; 0.8Ω max RON path for default signal routing |
| NO1, NO2 | Normally Open Analog Terminal | Connection to COMx only when INx = high; identical 0.8Ω max RON as NC path for symmetrical design |
| COM1, COM2 | Common Analog Terminal | Bidirectional I/O node shared between NOx and NCx; handles rail-to-rail signals (GND to V+) |
| IN1, IN2 | Digital Control Input | Active-high logic input; 1.8V-compatible, accepts up to +5.5V regardless of V+ supply |
| V+ | Positive Supply Voltage | Single power rail input (+1.8V to +5.5V); powers internal switch matrix and control logic |
| GND | Ground Reference | Return path for analog signals and supply current; must be low-impedance for THD performance |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical SPDT RON | 0.8Ω max for both NO and NC paths - eliminates channel imbalance in stereo audio routing |
| Break-Before-Make Timing | 2ns delay - prevents momentary short-circuit between NO and NC during switching in power routing |
| Rail-to-Rail Signal Handling | GND to V+ analog range - supports full-supply-swing audio and sensor signals without clipping |
| Ultra-Low Leakage | ±1nA max off-leakage at +25°C - avoids DC offset in precision sensor front-ends and battery monitoring |
| Low Charge Injection | 200pC max - minimizes glitch energy during switching in sample-and-hold and ADC input multiplexing |
Applications
| Speaker Headset Switching | MP3 Player Audio Routing |
|---|---|
Use Scenario: Dynamically selecting between internal speaker and 3.5mm headset jack in smartphones. IC Role / Device Role / Timing Role: Dual SPDT analog switch routing audio output from codec to either load, controlled by baseband processor GPIO. Use Value: 0.8Ω symmetrical RON ensures matched insertion loss and phase response between left/right channels, preserving stereo imaging. |
Use Scenario: Multiplexing line-out, headphone-out, and microphone-in signals in portable media players. IC Role / Device Role / Timing Role: Low-distortion analog switch enabling shared codec resources across multiple jacks with minimal THD degradation. Use Value: 0.03% THD and -68dB crosstalk prevent audible noise and channel bleed during playback and recording. |
| Cellular Phone Power Routing | Modem Signal Path Selection |
Use Scenario: Isolating battery voltage from RF power amplifier bias lines during sleep mode to reduce quiescent current. IC Role / Device Role / Timing Role: High-side analog switch controlling DC bias delivery with fast 40ns tOFF for rapid power-down sequencing. Use Value: 500mA peak current rating and ±300mA continuous rating support PA bias loads without derating at 3.3V operation. |
Use Scenario: Selecting between GSM and LTE transceiver paths in multi-mode modems. IC Role / Device Role / Timing Role: Dual-channel SPDT switch isolating RF front-end components while maintaining impedance continuity. Use Value: -64dB off-isolation prevents RF coupling between bands, meeting 3GPP spurious emission requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual SPDT analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4684EBC+T | Asymmetrical RON: 0.5Ω (NC) / 0.8Ω (NO) at +2.7V | Better suited for headset/speaker combo where NC path carries higher priority audio | Select MAX4684EBC+T if default path (NC) requires lower RON; MAX4685EBC-T preferred when channel matching is mandatory |
| TMUX1574RSVR | 0.5Ω RON, 10-pin WQFN, 1.8V–5.5V, but no guaranteed RON match spec | Larger 2.5mm × 2.5mm package; lacks UCSP footprint advantage | Choose TMUX1574RSVR only if board space allows larger package and RON matching is not required |
Compared with MAX4684EBC+T, MAX4685EBC-T provides superior channel-to-channel RON matching (0.06Ω vs unguaranteed), making it preferable for stereo audio; versus TMUX1574RSVR, MAX4685EBC-T offers 30% smaller PCB area and tighter parametric guarantees for portable designs.
Availability
MAX4685EBC-T is available at Aetrix Electronics and suitable for cellular phone audio routing, MP3 player signal multiplexing, and modem RF path selection requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX4685EBC-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 and mixed-signal ICs for power, sensing, interface, and timing applications in industrial, automotive, and consumer systems.
The MAX4685EBC-T belongs to Maxim's low-voltage analog switch product line, engineered specifically for compact, battery-operated devices demanding ultra-low RON, rail-to-rail signal integrity, and minimal PCB footprint.
FAQ
What is the maximum supply voltage for MAX4685EBC-T?
The absolute maximum supply voltage for MAX4685EBC-T is +6V, but the recommended operating range is +1.8V to +5.5V. Operation above +5.5V risks permanent damage, and the device is fully specified for 3V nominal systems. At +5.5V, supply current remains below 200nA, ensuring low power consumption in always-on circuits.
Does MAX4685EBC-T support bidirectional analog signal flow?
Yes, MAX4685EBC-T supports fully bidirectional analog signal routing on all COM, NO, and NC terminals. Signals can pass from COM to NO/NC or vice versa with identical 0.8Ω max on-resistance and <0.35Ω flatness, enabling flexible use in both source and load positions within audio and sensor signal chains.
What is the thermal limit for reflow soldering of MAX4685EBC-T's UCSP package?
MAX4685EBC-T's 12-bump UCSP requires strict adherence to JEDEC J-STD-020A reflow profiles: infrared peak temperature ≤+220°C (15s), vapor-phase peak ≤+215°C (60s). Hand or wave soldering is prohibited. Preheating is mandatory, and bump temperature must not exceed limits to avoid die attach voiding or solder joint fracture.
How does MAX4685EBC-T achieve 1.8V logic compatibility while powered from 3.3V?
MAX4685EBC-T accepts 1.8V logic inputs (VIH = 1.4V, VIL = 0.5V) regardless of V+ supply voltage. When V+ = 3.3V, the internal level-shifting circuitry interprets 1.4V as high and 0.5V as low - eliminating external translators and reducing BOM count in mixed-voltage SoC designs.
Is MAX4685EBC-T pin-compatible with MAX4684EBC+T?
Yes, MAX4685EBC-T and MAX4684EBC+T share identical 12-bump UCSP pinout, footprint, and terminal functions. Both use the same AAF/AAG top-mark coding scheme and operate across -40°C to +85°C. The only functional difference is RON asymmetry in MAX4684EBC+T versus symmetry in MAX4685EBC-T - no PCB changes are required for substitution.
MAX4685EBC-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Switch Circuit:
- SPDT - NO/NC
- Multiplexer/Demultiplexer Circuit:
- 2:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 800mOhm
- Channel-to-Channel Matching (ΔRon):
- 60mOhm (Max)
- Voltage - Supply, Single (V+):
- 1.8V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 50ns, 30ns
- -3db Bandwidth:
- -
- Charge Injection:
- 200pC
- Channel Capacitance (CS(off), CD(off)):
- 84pF
- Current - Leakage (IS(off)) (Max):
- 1nA
- Crosstalk:
- -68dB @ 100kHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-UCSP
MAX4685EBC-T FAQ
1.How can I place an order for MAX4685EBC-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4685EBC-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 MAX4685EBC-T reliable?
The price and inventory of MAX4685EBC-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4685EBC-T is usually 5 days.
3.What payment methods are accepted for MAX4685EBC-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4685EBC-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4685EBC-T?
MAX4685EBC-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4685EBC-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 MAX4685EBC-T?
For technical support, including MAX4685EBC-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4685EBC-T requirements.
6.How does Aetrix verify that MAX4685EBC-T is sourced from the original manufacturer or authorized distributors?
All MAX4685EBC-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 MAX4685EBC-T meets industry standards.
7.What is the process for return or replacement of MAX4685EBC-T?
All MAX4685EBC-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4685EBC-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 MAX4685EBC-T part is unused and in its original packaging.
Return procedure for MAX4685EBC-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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