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Analog Devices Inc./Maxim Integrated MAX4635ETB-T
- Part No.:
- MAX4635ETB-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX4635ETB-T.pdf
- Description:
- DUAL SPDT ANALOG SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:3,461
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Product details
Overview
MAX4635ETB-T from Maxim Integrated is a dual SPDT CMOS analog switch with inverted logic control, housed in a 10-pin 3mm × 3mm thin QFN package. It delivers ≤4Ω on-resistance at +5V, 14ns max turn-on time, rail-to-rail signal handling (0V to V+), and operates from +1.8V to +5.5V - enabling low-voltage audio routing and battery-powered data-acquisition multiplexing.
For engineers reviewing the MAX4635ETB-T datasheet, MAX4635ETB-T pinout, MAX4635ETB-T application, or MAX4635ETB-T equivalent, this device is selected for precision analog switching where low on-resistance flatness (≤1Ω), high off-isolation (−65dB at 1MHz), and minimal charge injection (2pC) are critical in compact, low-power systems.
Technical Context
The MAX4635ETB-T implements two independent SPDT switches using CMOS transmission-gate architecture with guaranteed break-before-make timing (≤1ns). Its inverted logic inputs (IN1/IN2) drive complementary gate signals to ensure channel isolation during state transitions.
Each switch supports bidirectional analog signal flow across COM1/COM2, NO1/NO2, and NC1/NC2 terminals, with rail-to-rail voltage handling and leakage currents ≤0.3nA over −40°C to +85°C. The thin QFN package features an exposed pad for thermal performance but no internal thermal sensor or enable pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-Resistance (max) | 4Ω at +5V supply - enables <10mV drop at 2.5mA signal current, preserving accuracy in precision sensor interfaces. |
| On-Resistance Flatness (max) | 1Ω at +5V - ensures consistent gain and linearity across full 0V–V+ analog input range. |
| Turn-On / Turn-Off Time (max) | 14ns / 6ns - supports >30MHz digital control of analog paths without timing-induced distortion. |
| Off-Isolation | −65dB at 1MHz - suppresses crosstalk between active and inactive channels in multi-signal routing. |
| Rail-to-Rail Signal Range | 0V to V+ - allows direct interfacing with ADCs, DACs, and op-amps operating at same supply without level-shifting. |
| Supply Voltage Range | +1.8V to +5.5V - supports operation from single Li-ion cell (3.0–3.7V) up to 5V legacy systems. |
| Logic Compatibility | 5.5V-tolerant IN pins - permits direct connection to 5V microcontroller GPIO while powered from 3.3V or lower. |
Pinout & Package
MAX4635ETB-T uses a 10-pin 3mm × 3mm thin QFN package (T1033-1 variation) with exposed thermal pad (not electrically connected). Pin 1 index is marked by a dot; no internal pull-up/down resistors or enable functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN1 | Inverted logic control for Switch 1 | Low = connect COM1 to NC1; High = connect COM1 to NO1 - matches inverted truth table per datasheet. |
| 2 NO1 | Normally open terminal, Switch 1 | Open when IN1 = Low; closed path to COM1 when IN1 = High - used for active-signal routing paths. |
| 3 GND | Analog/digital ground reference | Common return for V+, logic inputs, and analog signals - must be low-impedance for THD <0.1%. |
| 4 NO2 | Normally open terminal, Switch 2 | Independent of Switch 1; controlled by IN2 - enables dual-channel signal selection without shared nodes. |
| 5 IN2 | Inverted logic control for Switch 2 | Functionally identical to IN1 but isolated - allows asynchronous control of two analog paths. |
| 6 COM2 | Common terminal, Switch 2 | Bidirectional node - accepts or delivers analog signal depending on IN2 state and external circuit topology. |
| 7 NC2 | Normally closed terminal, Switch 2 | Connected to COM2 when IN2 = Low - provides default signal path in fail-safe or power-off conditions. |
| 8 V+ | Positive supply input | Supplies both analog switch core and logic interface; decoupling capacitor required within 1cm for stable tON/tOFF. |
| 9 NC1 | Normally closed terminal, Switch 1 | Provides default path for COM1 when IN1 = Low - used in relay-replacement and standby-mode applications. |
| 10 COM1 | Common terminal, Switch 1 | Primary analog I/O node for Switch 1 - connects to system signal source or load depending on switch state. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed on-resistance match | ≤0.2Ω max between channels - eliminates gain mismatch in differential or dual-path signal conditioning. |
| Low charge injection | 2pC typical - minimizes voltage glitch on high-impedance nodes (e.g., sample-and-hold capacitors). |
| High off-isolation & low crosstalk | −65dB off-isolation, −67dB crosstalk at 1MHz - preserves signal integrity in multi-channel AFEs. |
| Rail-to-rail analog operation | Full 0V to V+ signal swing supported - avoids clipping in audio, sensor, and data-acquisition front-ends. |
| Break-before-make timing | ≤1ns guaranteed - prevents momentary shorting between NO/NC paths during switching transitions. |
Applications
| Audio Signal Routing | Low-Voltage Data Acquisition |
|---|---|
|
Use Scenario: Selecting between microphone inputs or headphone outputs in portable audio codecs. IC Role / Device Role / Timing Role: Dual SPDT analog switch providing bidirectional, low-distortion signal path selection under microcontroller control. Use Value: 0.1% THD and rail-to-rail operation preserve audio fidelity; 4Ω RON minimizes insertion loss in 2kΩ audio paths. |
Use Scenario: Multiplexing multiple sensor outputs (e.g., thermistors, RTDs) into a single ADC channel. IC Role / Device Role / Timing Role: Precision analog switch enabling sequential sampling with minimal channel-to-channel error. Use Value: ≤0.2Ω on-resistance match and ≤1Ω flatness ensure <0.05% gain error across temperature and signal range. |
| Relay Replacement | Sample-and-Hold Circuits |
|
Use Scenario: Replacing electromechanical relays in battery-powered test equipment for signal path configuration. IC Role / Device Role / Timing Role: Solid-state SPDT switch delivering zero-bounce, low-power, and long-life signal routing. Use Value: 1.8V operation and <1µA supply current extend battery life; 14ns switching enables rapid reconfiguration. |
Use Scenario: Isolating hold capacitor from input source during acquisition phase in precision ADC front-ends. IC Role / Device Role / Timing Role: Fast, low-leakage switch controlling capacitor charging and isolation timing. Use Value: 0.3nA max COM_ on-leakage prevents hold capacitor drift; 2pC charge injection limits voltage step error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4636ETB-T | Same package and pinout, but non-inverted logic (IN = High → COM to NO); 4Ω RON at +5V identical. | Requires inverted control signal logic in firmware/hardware; otherwise functionally interchangeable in routing topologies. | Select MAX4636ETB-T when system logic naturally drives high-active control lines without inversion. |
| TMUX6219RUCR | 4.5Ω RON at +5V, 16ns tON, 3.5mm × 3.5mm WQFN-16; supports ±5V dual-supply operation (MAX4635ETB-T is single-supply only). | Suitable for bipolar signal routing (±2.5V) and higher-voltage industrial sensors where MAX4635ETB-T's 0–V+ range is insufficient. | Choose TMUX6219RUCR when bipolar analog signals or extended voltage headroom (>5.5V total span) are required. |
Compared with MAX4636ETB-T, the MAX4635ETB-T offers identical analog performance but requires inverted control logic - simplifying designs with open-drain or active-low drivers. Versus TMUX6219RUCR, it trades bipolar capability and larger package for lower cost, smaller footprint, and optimized low-voltage efficiency.
Availability
MAX4635ETB-T is available at Aetrix Electronics and suitable for battery-powered equipment, audio signal routing, and low-voltage data-acquisition systems requiring stable component supply and RoHS-compliant sourcing.
Supply support for MAX4635ETB-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, medical, and communications applications.
The MAX4635/MAX4636 product line targets low-voltage, high-fidelity analog switching - emphasizing rail-to-rail operation, low on-resistance flatness, and fast timing for portable and space-constrained systems.
FAQ
What is the logic polarity of MAX4635ETB-T?
The MAX4635ETB-T features inverted logic: a logic low on IN1 or IN2 connects the common terminal (COM1/COM2) to the normally closed terminal (NC1/NC2), while a logic high connects to the normally open terminal (NO1/NO2). This is confirmed in the truth table and pin description sections of the official datasheet. The MAX4635ETB-T differs from the MAX4636ETB-T solely in this logic sense - all electrical specifications remain identical.
Does MAX4635ETB-T support rail-to-rail analog signals?
Yes, the MAX4635ETB-T supports rail-to-rail analog signal operation from 0V to V+. Its CMOS transmission-gate design allows analog voltages equal to the supply rails (e.g., 0V and +5.5V) to pass with minimal distortion or on-resistance variation - verified in the "Analog Signal Range" specification and Typical Operating Characteristics plots. This capability is essential for interfacing directly with ADCs, DACs, and op-amps sharing the same supply.
What is the maximum supply voltage for MAX4635ETB-T?
The absolute maximum supply voltage for MAX4635ETB-T is +6V, but the recommended operating range is +1.8V to +5.5V. Exceeding +6V risks permanent damage, as stated in the Absolute Maximum Ratings table. Operation at +5.5V maintains guaranteed 4Ω max on-resistance and 14ns max turn-on time; performance degrades gradually below +1.8V, where logic thresholds may become unreliable.
How does MAX4635ETB-T handle power-supply sequencing?
MAX4635ETB-T requires V+ to be applied before analog signals to prevent latch-up or ESD diode conduction. If sequencing cannot be guaranteed - especially with uncurrent-limited analog sources - external protection diodes (D1/D2 per Figure 5 in the datasheet) are recommended. These diodes clamp fault voltages but reduce effective analog range by ~0.7V. The MAX4635ETB-T itself contains no internal protection beyond standard CMOS input clamps.
Is MAX4635ETB-T pin-compatible with MAX4635EUB-T?
Yes, MAX4635ETB-T (3mm × 3mm thin QFN) and MAX4635EUB-T (10-pin µMAX) share identical pin functions and logic behavior, but differ in physical package, thermal characteristics, and PCB layout. Both use the same pin numbering and signal mapping (e.g., Pin 1 = IN1, Pin 10 = COM1), enabling schematic reuse. However, the thin QFN's exposed pad and finer pitch require different land patterns and reflow profiles versus the µMAX package.
MAX4635ETB-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Switch Circuit:
- SPDT
- Multiplexer/Demultiplexer Circuit:
- 2:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 4Ohm
- Channel-to-Channel Matching (ΔRon):
- 100mOhm
- Voltage - Supply, Single (V+):
- 1.8V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 14ns, 6ns
- -3db Bandwidth:
- -
- Charge Injection:
- 2pC
- Channel Capacitance (CS(off), CD(off)):
- 9pF
- Current - Leakage (IS(off)) (Max):
- 100pA
- Crosstalk:
- -67dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x3)
MAX4635ETB-T FAQ
1.How can I place an order for MAX4635ETB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4635ETB-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 MAX4635ETB-T reliable?
The price and inventory of MAX4635ETB-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4635ETB-T is usually 5 days.
3.What payment methods are accepted for MAX4635ETB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4635ETB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4635ETB-T?
MAX4635ETB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4635ETB-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 MAX4635ETB-T?
For technical support, including MAX4635ETB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4635ETB-T requirements.
6.How does Aetrix verify that MAX4635ETB-T is sourced from the original manufacturer or authorized distributors?
All MAX4635ETB-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 MAX4635ETB-T meets industry standards.
7.What is the process for return or replacement of MAX4635ETB-T?
All MAX4635ETB-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4635ETB-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 MAX4635ETB-T part is unused and in its original packaging.
Return procedure for MAX4635ETB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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