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Analog Devices Inc./Maxim Integrated MAX4649EKA-T
- Part No.:
- MAX4649EKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-8
- Datasheet:
-
MAX4649EKA-T.pdf
- Description:
- IC SWITCH SPDT X 1 45OHM SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX4649EKA-T from Maxim Integrated is a dual-supply, single-pole/double-throw (SPDT) analog switch in an 8-pin SOT23 package. It features 45Ω max on-resistance, ±4.5V to ±20V dual supply or +9V to +36V single supply operation, guaranteed break-before-make switching (5ns min), and rail-to-rail signal handling - used for high-voltage signal routing in telecom test equipment and avionics.
For engineers reviewing the MAX4649EKA-T datasheet, MAX4649EKA-T pinout, MAX4649EKA-T application, or MAX4649EKA-T equivalent, key selection criteria include on-resistance flatness (7Ω max), off-isolation (–92dB at 1MHz), crosstalk (–92dB at 1MHz), TTL/CMOS-compatible control inputs, and SOT23-8 thermal and layout constraints.
Technical Context
The MAX4649EKA-T uses CMOS switch architecture with break-before-make timing control to prevent signal shorting during state transitions. Its dual-supply design supports symmetric (±15V) or asymmetric rails, enabling true rail-to-rail analog signal conduction across COM, NO, and NC terminals without clipping.
Switch control is implemented via a single digital input (IN) referenced to GND, with no separate logic supply required. Internal level-shifting ensures TTL/CMOS compatibility across full temperature range (–40°C to +85°C), while charge injection is limited to 2pC typical - critical for precision sampling and multiplexing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-Resistance (RON) | 45Ω max at ±15V supplies - ensures minimal signal attenuation and voltage drop in high-precision analog paths. |
| RON Flatness | 7Ω max over full signal range - maintains consistent gain and linearity when switching varying DC or AC signals. |
| Break-Before-Make Delay | 5ns guaranteed - prevents momentary shorting between NO and NC paths during switching, essential for fault-tolerant routing. |
| Off-Isolation / Crosstalk | –92dB at 1MHz - suppresses signal coupling between channels, enabling clean multi-channel test instrumentation. |
| Supply Range | ±4.5V to ±20V dual or +9V to +36V single - supports legacy telecom voltages and industrial HV signal chains without external level shifters. |
| Off-Leakage Current | 2nA max at +25°C - preserves accuracy in high-impedance sensor interfaces and sample-and-hold circuits. |
| Transition Time | 130ns max - enables reliable switching of audio-band and low-speed data signals without edge distortion. |
Pinout & Package
MAX4649EKA-T is housed in an 8-pin SOT23 package (JEDEC MO-178AA), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and exposed pad not present. Thermal resistance θJA = 112°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COM | Analog Switch Common | Signal path hub - connects to either NO or NC depending on IN logic state; must be routed with controlled impedance for high-frequency integrity. |
| 2 - NC | Normally Closed Terminal | Connected to COM when IN = low (0.8V); open-circuit when IN = high - used for default-path or fail-safe routing. |
| 3 - GND | Ground Reference | Logic and substrate reference; must tie directly to low-impedance system ground plane to minimize noise coupling into analog paths. |
| 4 - V+ | Positive Supply Input | Bias for upper switch quadrant; sequencing requires V+ powered before V− and IN to avoid latch-up per datasheet guidance. |
| 5 - N.C. | No Connection | Internally unconnected silicon pad - must remain floating; no PCB trace or solder mask opening required. |
| 6 - IN | Digital Control Input | TTL/CMOS-compatible logic input (VIH ≥ 2.4V, VIL ≤ 0.8V); no pull-up/down needed; drives internal level shifter for supply-independent switching. |
| 7 - V− | Negative Supply Input | Bias for lower switch quadrant; absolute max rating limits V+ − V− ≤ 44V - critical for ±18V or ±20V operation. |
| 8 - NO | Normally Open Terminal | Connected to COM when IN = high (2.4V); isolated when IN = low - used for active-path selection in SPDT configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail Signal Handling | Supports analog signals from V− to V+ without clipping - enables direct interfacing with op-amps, DACs, and ADCs operating at full supply rails. |
| Guaranteed Break-Before-Make | 5ns minimum delay prevents overlap between NC and NO conduction - eliminates transient shorts in redundant signal paths and relay-replacement designs. |
| No VL Logic Supply Required | Single GND-referenced IN pin eliminates need for auxiliary logic rail - simplifies power architecture in mixed-voltage systems. |
| Low Crosstalk & High Off-Isolation | –92dB at 1MHz ensures channel independence in multi-signal test fixtures and DSL line card diagnostics. |
| On-Resistance Matching | 5Ω max mismatch between NO and NC paths - preserves balanced signal integrity in differential or dual-path routing applications. |
Applications
| PBX/PABX Signal Routing | Avionics Sensor Multiplexing |
|---|---|
Use Scenario: Dynamic reconfiguration of voice/data lines in digital private branch exchange systems under hot-swap conditions. IC Role / Device Role / Timing Role: SPDT analog switch providing fail-safe NC path and active NO path selection via centralized control bus. Use Value: 45Ω RON and 7Ω flatness maintain E&M signaling fidelity; ±20V dual supply accommodates legacy telephony voltage standards. | Use Scenario: Multiplexing multiple RTD or thermocouple inputs into a shared ADC front-end in flight control units. IC Role / Device Role / Timing Role: High-voltage analog multiplexer enabling cold-junction compensation and sensor redundancy without external biasing. Use Value: 2nA off-leakage prevents measurement drift; –92dB off-isolation avoids cross-channel interference in safety-critical sensor fusion. |
| DSL Line Card Testing | Redundant Power Monitoring |
Use Scenario: Automated test equipment switching between line pairs, termination loads, and diagnostic instruments on ADSL/VDSL hardware. IC Role / Device Role / Timing Role: Precision signal router isolating DUT from stimulus sources during calibration and fault injection sequences. Use Value: 130ns transition time supports burst-mode testing; 5ns break-before-make prevents transient shorts during load switching. | Use Scenario: Monitoring primary and backup 28VDC aircraft bus voltages with automatic switchover upon fault detection. IC Role / Device Role / Timing Role: Dual-path analog monitor selector ensuring continuous telemetry during power source transitions. Use Value: Rail-to-rail operation captures full 0–28V range; SOT23-8 footprint enables dense placement near bus sense points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPDT analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG1419BRMZ-REEL | 4.5Ω RON typ (±15V), but only ±16.5V max supply; no single-supply mode; 10ns tTRANS. | Higher precision, lower leakage (1pA), but narrower supply range limits use in +36V telecom systems. | Select ADG1419BRMZ-REEL where ultra-low RON and leakage outweigh supply flexibility needs. |
| TMUX6219RSVR | 3.5Ω RON typ (±16.5V), 1.5pA leakage, but requires VL logic supply; no guaranteed break-before-make spec. | Better THD (0.003%) and bandwidth, but lacks deterministic switching sequence - unsuitable for fault-tolerant routing. | Select TMUX6219RSVR for high-fidelity audio or precision DAQ where break-before-make is not safety-critical. |
Compared with ADG1419BRMZ-REEL and TMUX6219RSVR, the MAX4649EKA-T uniquely combines wide supply range (+9V to +36V / ±4.5V to ±20V), guaranteed break-before-make timing, and no-VL logic interface - making it optimal for telecom infrastructure and avionics where voltage robustness and deterministic switching are mandatory.
Availability
MAX4649EKA-T is available at Aetrix Electronics and suitable for PBX systems, avionics sensor interfaces, and DSL test equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX4649EKA-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 high-voltage ICs for industrial, communications, and automotive applications - emphasizing reliability, integration, and ruggedized performance.
The MAX4649 belongs to Maxim's high-voltage analog switch product line, engineered specifically for signal routing in telecom infrastructure, test instrumentation, and safety-critical embedded systems where rail-to-rail operation and supply flexibility are essential.
FAQ
What supply configurations does the MAX4649EKA-T support?
The MAX4649EKA-T operates from dual ±4.5V to ±20V supplies or a single +9V to +36V supply. It does not require a separate logic supply (VL), as its IN pin is TTL/CMOS-compatible and referenced to GND. The absolute maximum V+–V− differential is 44V, and proper sequencing (V+ first, then V−, then IN) is recommended to prevent latch-up. This makes the MAX4649EKA-T suitable for legacy telecom and industrial systems with wide voltage margins.
Does the MAX4649EKA-T guarantee break-before-make switching?
Yes, the MAX4649EKA-T guarantees a minimum break-before-make delay of 5ns under specified conditions (VNO/VNC = ±10V, RL = 300Ω, CL = 35pF). This deterministic timing prevents momentary shorting between NO and NC paths during state transitions - a critical requirement in relay-replacement, redundant signal routing, and fault-tolerant avionics designs. The MAX4649EKA-T datasheet explicitly specifies this parameter across the full temperature range (–40°C to +85°C).
What is the on-resistance flatness specification for the MAX4649EKA-T?
The MAX4649EKA-T specifies on-resistance flatness (RFLAT(ON)) as 7Ω maximum over the full analog signal range at +25°C, and 10Ω maximum across the full operating temperature range. Flatness is defined as the difference between max and min RON measured at multiple VCOM points (e.g., ±10V, 0V). This tight flatness ensures consistent gain and minimal harmonic distortion when switching audio, sensor, or telecom signals - a key differentiator versus general-purpose analog switches.
Can the MAX4649EKA-T handle rail-to-rail analog signals?
Yes, the MAX4649EKA-T is explicitly rated for rail-to-rail analog signal handling - meaning signals at COM, NO, and NC can swing from V− to V+ without clipping or increased distortion. This capability is enabled by its CMOS process and symmetric switch architecture. The device maintains 45Ω max RON and 7Ω max flatness across that full range, supporting direct interfacing with op-amps, DACs, and ADCs operating at their full supply rails - confirmed in both the General Description and Detailed Description sections of the MAX4649EKA-T datasheet.
What is the package type and pin count of the MAX4649EKA-T?
The MAX4649EKA-T is packaged in an 8-pin SOT23 (JEDEC MO-178AA) with 0.65mm lead pitch, measuring 2.9mm × 1.6mm. Pin 5 is a no-connect (N.C.) terminal, and the top-mark is "AAIE". This compact, surface-mount package supports high-density layouts in space-constrained applications like PC multimedia boards and modular test equipment - and is fully compatible with standard SOT23 reflow profiles and automated assembly processes.
MAX4649EKA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Switch Circuit:
- SPDT
- Multiplexer/Demultiplexer Circuit:
- 2:1
- Number of Circuits:
- 1
- On-State Resistance (Max):
- 45Ohm
- Channel-to-Channel Matching (ΔRon):
- 600mOhm
- Voltage - Supply, Single (V+):
- 9V ~ 36V
- Voltage - Supply, Dual (V±):
- ±4.5V ~ 20V
- Switch Time (Ton, Toff) (Max):
- -
- -3db Bandwidth:
- -
- Charge Injection:
- 2pC
- Channel Capacitance (CS(off), CD(off)):
- 6pF
- Current - Leakage (IS(off)) (Max):
- 2nA
- Crosstalk:
- -92dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX4649EKA-T FAQ
1.How can I place an order for MAX4649EKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4649EKA-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 MAX4649EKA-T reliable?
The price and inventory of MAX4649EKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4649EKA-T is usually 5 days.
3.What payment methods are accepted for MAX4649EKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4649EKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4649EKA-T?
MAX4649EKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4649EKA-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 MAX4649EKA-T?
For technical support, including MAX4649EKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4649EKA-T requirements.
6.How does Aetrix verify that MAX4649EKA-T is sourced from the original manufacturer or authorized distributors?
All MAX4649EKA-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 MAX4649EKA-T meets industry standards.
7.What is the process for return or replacement of MAX4649EKA-T?
All MAX4649EKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4649EKA-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 MAX4649EKA-T part is unused and in its original packaging.
Return procedure for MAX4649EKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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