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Analog Devices Inc./Maxim Integrated MAX14779ATP+
- Part No.:
- MAX14779ATP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX14779ATP+.pdf
- Description:
- IC SWITCH SPDT X 2 2.5OHM 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:293
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Product details
Overview
MAX14779ATP+ from Analog Devices is a dual SPDT beyond-the-rails analog switch supporting ±25V signal range with single 3.0V–5.5V supply, 2.5Ω max on-resistance at +85°C, ±200nA max on-leakage at +85°C, and -40°C to +125°C operation - used in RS-485/CAN/USB transceiver switching and audio amplifier routing.
For engineers reviewing the MAX14779ATP+ datasheet, MAX14779ATP+ pinout, MAX14779ATP+ application, or MAX14779ATP+ equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation value, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The MAX14779ATP+ integrates three internal charge pumps (5V-regulated, VP, VN) to enable ±25V analog signal switching from a single low-voltage supply; VP reaches +33V (typ), VN reaches -27V (typ), and both require external 10nF/100V bypass capacitors.
It implements break-before-make timing (289–500µs) between A1/A2 and B1/B2 paths, uses separate VL supply (1.62V–5.5V) to set logic thresholds independently of VCC, and supports bidirectional ±200mA continuous current per switch with short-circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | ±25V - enables direct switching of industrial RS-485, CAN, and audio signals without external level-shifting circuitry. |
| On-Resistance (max) | 2.5Ω at +85°C - ensures minimal voltage drop and power loss when routing ±200mA signals in precision instrumentation. |
| On-Leakage Current (max) | ±200nA at +85°C - preserves signal integrity in high-impedance sensor or measurement front-end paths. |
| Supply Voltage (VCC) | 3.0V to 5.5V - allows direct integration with standard microcontroller I/O rails and industrial 3.3V/5V systems. |
| Logic Supply (VL) | 1.62V to 5.5V - permits interoperability with 1.8V, 2.5V, 3.3V, or 5V controllers without level translators. |
| Switch Configuration | Dual SPDT - provides two independent pole-throw paths (A1/A2→ACOM and B1/B2→BCOM) for signal source selection or redundancy switching. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, industrial PLC, and base station applications. |
Pinout & Package
MAX14779ATP+ is housed in a 4mm × 4mm, 20-pin TQFN package (package code T2044+4C) with exposed pad connected to VN. Pin numbering follows standard top-view orientation with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VP | Positive charge-pump output | Provides +33V (typ) bias for high-side switch conduction; requires 10nF/100V ceramic capacitor to GND. |
| 2 GND | Ground reference | Common return for VCC, VL, VP, VN, and analog/switch paths; must be low-impedance connection. |
| 3 VN | Negative charge-pump output | Provides -27V (typ) bias for low-side switch conduction; requires 10nF/100V ceramic capacitor to GND. |
| 4 VCC | Main power supply input | 3.0V–5.5V supply powering internal logic and charge pumps; bypass with 1µF ceramic capacitor. |
| 5 I.C. | Internally connected | No external connection required; internally tied to GND. |
| 13 VL | Logic supply input | Sets ENA/ENB/SA/SB threshold voltages (VIL = 0.3×VL, VIH = 0.7×VL); bypass with 1µF ceramic capacitor. |
| EP | Exposed pad | Internally connected to VN; must be soldered to thermal pad on PCB for thermal performance and noise immunity. |
| 10,16,18,20 NC | No connect | Not bonded; leave unconnected and unpopulated on PCB layout. |
| 6 A1, 7 A2, 19 ACOM | SPDT path A terminals | A1 and A2 are throws; ACOM is common - SA selects A1 (low) or A2 (high) when ENA = high. |
| 8 B1, 9 B2, 17 BCOM | SPDT path B terminals | B1 and B2 are throws; BCOM is common - SB selects B1 (low) or B2 (high) when ENB = high. |
| 11 ENA, 12 SA, 14 ENB, 15 SB | Control inputs | ENA/ENB enable respective SPDT paths; SA/SB select throw position; all accept 1.62V–5.5V logic levels. |
Key Features
| Feature | Design Value |
|---|---|
| Beyond-the-rails signal handling | Supports ±25V analog signals with only 3.0V–5.5V VCC - eliminates need for dual-supply op-amps or discrete charge-pump ICs in signal routing stages. |
| Break-before-make switching | 289–500µs guaranteed dead time prevents momentary shorting between A1/A2 or B1/B2 - critical for safe multiplexing of isolated communication lines. |
| Independent logic-level interface | VL pin accepts 1.62V–5.5V, enabling direct control from 1.8V FPGAs or 5V MCUs without level shifters - reduces BOM count and layout complexity. |
| Integrated short-circuit protection | Each switch limits current during overcurrent events - protects downstream transceivers and avoids system latch-up in fault conditions. |
| High bandwidth (78MHz) | Preserves signal fidelity for USB 1.1 (12Mbps), CAN FD (up to 5Mbps), and audio band signals up to 20kHz with minimal attenuation. |
Applications
| RS-485 Transceiver Selection | USB/CAN Bus Switching |
|---|---|
|
Use Scenario: Dynamically selecting between two RS-485 transceivers sharing one bus connector in a modular industrial controller. IC Role / Device Role / Timing Role: Dual SPDT switch routing differential A/B lines to either transceiver while maintaining fail-safe biasing integrity. Use Value: Enables hot-swap reconfiguration without bus interruption; ±25V rating withstands RS-485 common-mode transients up to ±15V. |
Use Scenario: Sharing a single USB Type-C connector between USB 2.0 and CAN FD interfaces in an automotive diagnostic tool. IC Role / Device Role / Timing Role: Isolates USB D+/D- and CAN H/L pairs using separate SPDT sections, with break-before-make preventing cross-talk. Use Value: Eliminates mechanical relays; 78MHz bandwidth supports full-speed USB (480Mbps) eye diagram integrity and CAN FD bit-rate stability. |
| Audio Amplifier Redundancy | ATE Signal Path Multiplexing |
|
Use Scenario: Switching between primary and backup differential audio amplifiers in broadcast equipment to maintain uninterrupted output. IC Role / Device Role / Timing Role: Routes balanced XLR inputs/outputs via ACOM/A1/A2 and BCOM/B1/B2 paths under microcontroller control. Use Value: 2.5Ω on-resistance adds <0.01dB gain error at 600Ω load; ±200nA leakage prevents DC offset drift in high-gain stages. |
Use Scenario: Routing test signals between multiple DUTs and measurement instruments in automated test equipment racks. IC Role / Device Role / Timing Role: Provides low-distortion, high-isolation (–80dB off-isolation) path selection for precision voltage/current sourcing and sensing. Use Value: –90dB crosstalk and 18mΩ on-resistance flatness ensure <0.05% measurement accuracy across ±10V signal range. |
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 |
|---|---|---|---|
| MAX14774ATP+ | Quad SPST configuration (four independent switches), no break-before-make, lower on-leakage (±100nA max). | Used where four discrete signal paths are needed instead of two bidirectional selections - e.g., termination resistor switching in RS-485 nodes. | Select MAX14774ATP+ when independent enable control per path is required and SPDT functionality is unnecessary. |
| ADG5423F | Single SPDT with integrated fault protection (±40V continuous, ±60V transient), higher on-resistance (4.5Ω typ), same 20-TQFN package. | Preferred in safety-critical systems requiring overvoltage lockout and fault reporting - e.g., motor drive feedback monitoring. | Choose ADG5423F when robust fault protection and diagnostic capability outweigh the need for dual-path concurrency. |
Compared with MAX14779ATP+, MAX14774ATP+ offers greater channel independence but lacks SPDT topology and break-before-make timing, while ADG5423F trades bandwidth and leakage performance for certified fault resilience - making MAX14779ATP+ optimal for high-fidelity, concurrent dual-source selection in industrial communications.
Availability
MAX14779ATP+ is available at Aetrix Electronics and suitable for RS-485 transceiver selection, USB/CAN bus switching, and audio amplifier redundancy requiring stable component supply across extended temperature and high-voltage analog environments.
Supply support for MAX14779ATP+ 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX14779ATP+ belongs to Analog Devices' Beyond-The-Rails analog switch family, engineered specifically for high-voltage signal routing in single-supply industrial and test equipment where ±25V signal integrity and robust fault tolerance are mandatory.
FAQ
What is the maximum continuous current rating per switch in the MAX14779ATP+?
The MAX14779ATP+ supports ±200mA continuous current through each switch path (A1/A2→ACOM and B1/B2→BCOM) across the full -40°C to +125°C operating range. This rating applies under steady-state conditions with proper PCB thermal design and does not include transient surge currents.
Does the MAX14779ATP+ require external capacitors, and if so, what values and types?
Yes - the MAX14779ATP+ requires two external 10nF/100V ceramic capacitors: one between VP and GND, and another between VN and GND. These are mandatory for stable charge-pump operation. Additionally, 1µF ceramic capacitors are required on VCC and VL pins, placed as close as possible to the device.
Can the MAX14779ATP+ operate with VCC = 3.3V and VL = 1.8V simultaneously?
Yes - the MAX14779ATP+ fully supports independent supply rails: VCC can be 3.3V while VL is set to 1.8V. This configures logic thresholds at VIL = 0.54V and VIH = 1.26V, enabling direct interfacing with 1.8V FPGA I/O banks without level translation circuitry.
What is the purpose of the I.C. pin (pin 5) on the MAX14779ATP+?
The I.C. pin (pin 5) on the MAX14779ATP+ is internally connected to GND and serves no external function. It must be left unconnected on the PCB - no trace, pad, or component should be attached to this pin.
How does the MAX14779ATP+ behave when VCC is unpowered but analog signals are present?
When VCC = 0V, the MAX14779ATP+ remains functional for analog signal passage up to ±25V due to internal diode clamping to VP/VN. However, switches enter high-impedance state if |VA − VB| > 3V; below that, leakage up to ±5µA flows - sufficient for passive signal monitoring but not active switching.
MAX14779ATP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Active
- Switch Circuit:
- SPDT
- Multiplexer/Demultiplexer Circuit:
- 2:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 2.5Ohm
- Channel-to-Channel Matching (ΔRon):
- 18mOhm
- Voltage - Supply, Single (V+):
- 3V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 600µs, 160µs
- -3db Bandwidth:
- 78MHz
- Charge Injection:
- 850pC
- Channel Capacitance (CS(off), CD(off)):
- 54pF
- Current - Leakage (IS(off)) (Max):
- 100nA
- Crosstalk:
- -90dB @ 100kHz
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (4x4)
MAX14779ATP+ FAQ
1.How can I place an order for MAX14779ATP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14779ATP+ 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 MAX14779ATP+ reliable?
The price and inventory of MAX14779ATP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14779ATP+ is usually 5 days.
3.What payment methods are accepted for MAX14779ATP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14779ATP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14779ATP+?
MAX14779ATP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14779ATP+ 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 MAX14779ATP+?
For technical support, including MAX14779ATP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14779ATP+ requirements.
6.How does Aetrix verify that MAX14779ATP+ is sourced from the original manufacturer or authorized distributors?
All MAX14779ATP+ 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 MAX14779ATP+ meets industry standards.
7.What is the process for return or replacement of MAX14779ATP+?
All MAX14779ATP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX14779ATP+, 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 MAX14779ATP+ part is unused and in its original packaging.
Return procedure for MAX14779ATP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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