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Analog Devices Inc./Maxim Integrated MAX14778ETP+T
- Part No.:
- MAX14778ETP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX14778ETP+T.pdf
- Description:
- IC SWITCH SP4T X 2 1.5OHM 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,891
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Product details
Overview
The MAX14778ETP+T from Maxim Integrated is a dual ±25V above- and below-the-rails 4:1 analog multiplexer IC designed for high-voltage signal routing in mixed-protocol interfaces. It operates from a single 3.0V to 5.5V supply, delivers ≤1.5Ω on-resistance, supports ±300mA bidirectional current per channel, and enables RS-485 (20Mbps), USB 1.1 (12Mbps), and audio multiplexing on shared connectors.
For engineers reviewing the MAX14778ETP+T datasheet, MAX14778ETP+T pinout, MAX14778ETP+T application, or MAX14778ETP+T equivalent, key selection criteria include its ±25V rail-to-rail analog range, independent break-before-make switching per MUX, 75MHz bandwidth, ±6kV HBM ESD protection on A_/B_ pins, and TQFN-20 (5mm × 5mm) industrial-grade packaging.
Technical Context
The MAX14778ETP+T integrates three charge pumps - a regulated 5V pump, +35V VP pump, and -27V VN pump - enabling ±25V signal handling with no negative supply. When VDD exceeds 4.64V, the 5V pump disables and VDD directly powers the high-voltage pumps, reducing quiescent current.
Each of the two independent 4:1 multiplexers features dedicated enable (ENA/ENB) and 2-bit select (SA0/SA1, SB0/SB1) inputs, supporting break-before-make switching with 840µs guaranteed interval. Signal paths are fully bidirectional, with leakage currents ≤±250nA (A_/B_ off-state) and ≤±1µA (ACOM/BCOM off-state) across -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0V to 5.5V single supply - eliminates need for dual-rail or negative supplies in ±25V signal systems. |
| Analog Signal Range | ±25V - supports full RS-232, RS-485, and USB 1.1 voltage swings without level shifting. |
| On-Resistance (RON) | ≤1.5Ω max - ensures minimal insertion loss and voltage drop at ±300mA continuous current. |
| RON Flatness | 3mΩ typ - maintains consistent gain and THD+N (0.003%) across entire -25V to +25V common-mode range. |
| Bandwidth | 75MHz - enables clean switching of 20Mbps RS-485 and 12Mbps USB 1.1 signals. |
| ESD Protection | ±6kV HBM on A_/B_ pins - allows direct cable/connector interfacing without external protection. |
| Operating Temp | -40°C to +85°C - qualified for commercial and extended industrial environments (non-automotive). |
Pinout & Package
MAX14778ETP+T is housed in a 20-pin, 5mm × 5mm TQFN-EP package with exposed pad connected to VN. The package supports high thermal efficiency (θJC = 2°C/W) and meets RoHS requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5 | BCOM / ACOM | Common terminals for MUX B and MUX A - bidirectional I/O nodes carrying up to ±300mA. |
| 2, 4 | VP / VN | Charge-pump outputs requiring 100nF bypass to GND - generate ±25V bias rails internally. |
| 3, 13 | GND / VDD | Ground reference and primary power input - VDD must be bypassed with 1µF ceramic capacitor. |
| 6–9, 17–20 | A0–A3 / B0–B3 | Four bidirectional analog I/O channels per MUX - support full-duplex and demux operation. |
| 10, 16 | ENA / ENB | Independent active-high enables - disconnect all channels from ACOM/BCOM when low. |
| 11–12, 14–15 | SA0/SA1 / SB0/SB1 | 2-bit binary channel selectors - determine which A_/B_ input connects to ACOM/BCOM. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 MUX architecture | Enables simultaneous, non-interfering routing of two separate signal families (e.g., RS-485 + USB) on one board. |
| Break-before-make switching | Guaranteed 840µs isolation gap prevents short-circuit transients during channel changes. |
| ±25V rail-to-rail analog range | Supports legacy and modern interface standards without external level shifters or dual supplies. |
| 78pF input capacitance | Minimizes loading on high-impedance sources and preserves signal integrity at >10MHz frequencies. |
| Thermal shutdown protection | Triggers at 145°C with 25°C hysteresis - prevents latch-up or damage under sustained overload. |
Applications
| RS-485/USB Connector Sharing | POS Peripheral Multiplexing |
|---|---|
|
Use Scenario: A single RJ-45 or mini-USB connector carries both RS-485 industrial control data and USB 1.1 configuration traffic in point-of-sale terminals. IC Role / Device Role / Timing Role: MAX14778ETP+T acts as a protocol-aware analog switch, isolating unused transceivers while routing active signals with <840µs break-before-make timing. Use Value: Reduces connector count and PCB footprint by 50%, while maintaining full ±25V RS-485 compliance and 12Mbps USB timing margins. |
Use Scenario: Barcode scanners, magnetic stripe readers, and receipt printers share I/O lines via a common header in compact retail kiosks. IC Role / Device Role / Timing Role: MAX14778ETP+T serves as a bidirectional analog mux, selecting between peripheral devices using GPIO-controlled SA/SB logic. Use Value: Enables hot-swap peripheral support with ≤1.5Ω RON and ±6kV HBM protection - eliminating external TVS diodes and saving BOM cost. |
| Handheld Industrial Data Logger | Multi-Standard Audio/Data Hub |
|
Use Scenario: Rugged handheld device acquires analog sensor data (±10V), RS-232 diagnostics, and audio alerts using one set of external jacks. IC Role / Device Role / Timing Role: MAX14778ETP+T functions as a voltage-range-agile signal router, switching between sensor inputs, comms lines, and audio paths. Use Value: Supports ±25V tolerance and -40°C to +85°C operation - ensuring reliable field use without signal degradation or cold-start failure. |
Use Scenario: Embedded audio interface routes line-level stereo, digital audio (I²S), and control signals (RS-232) through a single 3.5mm TRRS jack. IC Role / Device Role / Timing Role: MAX14778ETP+T provides isolated analog path selection with 75MHz bandwidth and <0.003% THD+N for clean audio pass-through. Use Value: Delivers <−103dB crosstalk and −80dB off-isolation - preventing audible interference between audio and data channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX14777ETP+T | Single 4:1 MUX (vs. dual); identical ±25V range, RON, and package. | Lacks independent second MUX - unsuitable for concurrent RS-485 + USB routing. | Select when only one high-voltage multiplex path is required and board space is constrained. |
| TMUX6219RTER | Single-supply ±16.5V max (vs. ±25V); 3.5Ω RON (vs. ≤1.5Ω); no integrated charge pumps. | Requires external bias circuitry for >±16.5V signals; not drop-in for RS-485 full-swing. | Consider only if system voltage stays within ±16.5V and lower cost outweighs performance trade-offs. |
Compared with MAX14778ETP+T, MAX14777ETP+T reduces channel count but retains identical voltage range and robustness, while TMUX6219RTER offers lower cost at the expense of signal range, on-resistance, and integration - making MAX14778ETP+T optimal for multi-protocol, high-voltage, space-constrained designs.
Availability
MAX14778ETP+T is available at Aetrix Electronics and suitable for RS-485 communication systems, POS peripheral interfaces, and handheld industrial data loggers requiring stable component supply, long-term lifecycle assurance, and industrial temperature support.
Supply support for MAX14778ETP+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 industrial, communications, and computing applications.
The MAX14778ETP+T belongs to Maxim's high-voltage analog switch product line, engineered specifically for connector sharing and multi-standard interface consolidation in space- and voltage-constrained embedded systems.
FAQ
What is the maximum continuous current rating for each channel of the MAX14778ETP+T?
The MAX14778ETP+T supports ±300mA continuous current through any selected A_ or B_ channel to its respective common terminal (ACOM or BCOM). This rating applies over the full -40°C to +85°C operating range and is validated with ≤1.5Ω on-resistance and thermal shutdown at 145°C.
Does the MAX14778ETP+T require external capacitors, and if so, where and why?
Yes - the MAX14778ETP+T requires a 100nF ceramic capacitor from VP to GND and another from VN to GND to stabilize the internal high-voltage charge pumps and guarantee ±6kV HBM ESD protection. Additionally, a 1µF capacitor is required from VDD to GND for supply decoupling.
Can the MAX14778ETP+T operate with signals beyond ±25V, and what happens if it does?
No - the absolute maximum analog signal range is strictly ±25V (per A_, B_, ACOM, BCOM pins). Exceeding this violates Absolute Maximum Ratings and risks permanent damage. The VP-to-VN differential limit is +70V, and VP/VN must remain within specified bounds relative to VDD and GND to avoid latch-up or overstress.
How does the MAX14778ETP+T handle unpowered operation, and what precautions apply?
When VDD = 0V, the MAX14778ETP+T tolerates ±25V on A_, B_, ACOM, and BCOM pins with typical leakage <1µA. However, applied voltages charge the VP/VN bypass capacitors, generating transient currents; dv/dt must be limited to ≤3V/µs after capacitors reach steady state to stay within the 300mA absolute max rating.
Is the MAX14778ETP+T pin-compatible with other variants in the MAX14778 family?
Yes - MAX14778ETP+T shares identical pinout, package (20-pin TQFN-EP), and footprint with MAX14778ATP+T. The only difference is temperature grade: MAX14778ETP+T is rated for -40°C to +85°C, while MAX14778ATP+T extends to +125°C. No PCB redesign is needed when upgrading to the A-grade version.
MAX14778ETP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Circuit:
- SP4T
- Multiplexer/Demultiplexer Circuit:
- 4:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 1.5Ohm
- Channel-to-Channel Matching (ΔRon):
- -
- Voltage - Supply, Single (V+):
- 3V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 2ms, 1.5ms
- -3db Bandwidth:
- 75MHz
- Charge Injection:
- 1720pC
- Channel Capacitance (CS(off), CD(off)):
- 78pF
- Current - Leakage (IS(off)) (Max):
- 1µA
- Crosstalk:
- -103dB @ 100kHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX14778ETP+T FAQ
1.How can I place an order for MAX14778ETP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14778ETP+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 MAX14778ETP+T reliable?
The price and inventory of MAX14778ETP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14778ETP+T is usually 5 days.
3.What payment methods are accepted for MAX14778ETP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14778ETP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14778ETP+T?
MAX14778ETP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14778ETP+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 MAX14778ETP+T?
For technical support, including MAX14778ETP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14778ETP+T requirements.
6.How does Aetrix verify that MAX14778ETP+T is sourced from the original manufacturer or authorized distributors?
All MAX14778ETP+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 MAX14778ETP+T meets industry standards.
7.What is the process for return or replacement of MAX14778ETP+T?
All MAX14778ETP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX14778ETP+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 MAX14778ETP+T part is unused and in its original packaging.
Return procedure for MAX14778ETP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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