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Analog Devices Inc./Maxim Integrated MAX3408EUK+T
- Part No.:
- MAX3408EUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX3408EUK+T.pdf
- Description:
- IC TERMINATION NETWORK SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,185
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Product details
Overview
MAX3408EUK+T from Maxim Integrated is a switchable line-termination network that toggles between 100Ω and 120Ω termination values based on the logic state of its ENABLE pin, supporting coaxial or twisted-pair cable interfaces in telecom and industrial networks. It operates from +4.5V to +5.5V, draws ≤50µA supply current, maintains ±2.5% resistance accuracy over –40°C to +85°C, and supports bipolar signal swings up to ±3.6V.
For engineers reviewing the MAX3408EUK+T datasheet, MAX3408EUK+T pinout, MAX3408EUK+T application, or MAX3408EUK+T equivalent, key selection criteria include guaranteed 100Ω/120Ω switching behavior, low quiescent current, SOT23-5 footprint compatibility, and stable impedance performance up to 36MHz for E1/T1 and video security systems.
Technical Context
The MAX3408EUK+T implements a digitally controlled, single-pole double-throw (SPDT) analog switch topology within a BiCMOS process, routing signal path A–B through precision resistor networks selected by ENABLE. Its internal architecture ensures minimal parasitic reactance-typical impedance deviation remains under ±1Ω from DC to 36MHz in both 100Ω and 120Ω modes.
Termination switching occurs with 50µs turn-on/turn-off times, and input hysteresis (200mV) prevents chatter during ENABLE transitions. The device requires no external biasing and functions as a two-terminal passive-appearing load when ENABLE is static, maintaining high common-mode rejection across its ±3.6V input voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Termination Values | 100Ω (ENABLE = 1), 120Ω (ENABLE = 0); precise matching to T1/E1 and industrial fieldbus characteristic impedances |
| Resistance Accuracy | ±2.5% over –40°C to +85°C; eliminates need for calibration or trimming in production |
| Supply Voltage | +4.5V to +5.5V; compatible with standard 5V logic rails and industrial power domains |
| Supply Current | ≤50µA max; enables always-on termination in low-power remote nodes without thermal penalty |
| Input Voltage Range | ±3.6V differential (A–B); supports full-swing RS-422, ECL, and baseband video signals |
| Switching Speed | tON/tOFF = 50µs; sufficient for manual or slow-control reconfiguration (not real-time dynamic switching) |
| Operating Temp | –40°C to +85°C; qualified for telecom racks, outdoor enclosures, and factory-floor networking gear |
Pinout & Package
The MAX3408EUK+T is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), with exposed pad not connected. Pin 1 is VCC, Pin 2 is GND, Pin 3 is ENABLE, Pin 4 is B, and Pin 5 is A - configured for direct in-line placement across transmission line pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply input | Must be decoupled to GND with 0.1µF ceramic capacitor placed adjacent to pin; powers internal switch and reference circuitry |
| GND (Pin 2) | Ground reference | Common return for supply, control, and signal paths; forms low-inductance loop with VCC bypass |
| ENABLE (Pin 3) | Digital control input | Active-high logic interface: HIGH selects 100Ω mode, LOW selects 120Ω mode; 200mV hysteresis prevents metastability |
| B (Pin 4) | Terminator terminal B | One side of the switched resistor network; connects directly to cable shield or return conductor in coax/twisted-pair layouts |
| A (Pin 5) | Terminator terminal A | Other side of the switched resistor network; connects to signal conductor; forms bidirectional 2-terminal termination load |
Key Features
| Feature | Design Value |
|---|---|
| Switchable 100Ω/120Ω termination | Enables single-footprint support for dual-standard interfaces (e.g., T1 vs. E1, Profibus vs. CAN FD physical layer variants) |
| ±2.5% resistance tolerance over temperature | Reduces worst-case reflection coefficient to <0.015 (–36dB return loss), outperforming discrete 5% resistors |
| 50µA max supply current | Allows permanent termination activation in battery-backed or energy-harvested edge nodes without measurable drain |
| ±3.6V input voltage range | Supports unipolar and bipolar signaling without level-shifting, including composite video and RS-422 data links |
| SOT23-5 package | 0.95mm pitch, 2.9mm × 1.6mm footprint; fits high-density PCB layouts where space-constrained termination is critical |
Applications
| Telecom E1/T1 Line Termination | Video Security Systems |
|---|---|
Use Scenario: Configuring backplane or patch-panel termination for E1 (120Ω) or T1 (100Ω) digital trunk lines in central office or remote DSLAM cabinets. IC Role / Device Role / Timing Role: Two-terminal programmable load providing impedance-matched termination at line receiver inputs to suppress reflections and jitter. Use Value: Eliminates manual jumper changes or dual-resistor footprints; enables firmware-controlled line standard adaptation without hardware revision. | Use Scenario: Terminating analog CVBS or HD-SDI coaxial feeds from IP cameras to DVR/NVR chassis in surveillance installations. IC Role / Device Role / Timing Role: Passive-appearing, voltage-tolerant termination element placed at receiver end of 75Ω coax runs to prevent ghosting and edge ringing. Use Value: Maintains <0.015 reflection coefficient across –40°C to +85°C ambient, ensuring consistent video integrity in uncontrolled environments. |
| Industrial Fieldbus Networks | Data Routers with Multi-Standard Ports |
Use Scenario: Supporting PROFIBUS (120Ω) and Foundation Fieldbus H1 (100Ω) on shared physical layer hardware in process automation I/O modules. IC Role / Device Role / Timing Role: Reconfigurable termination node enabling single PCB design to serve multiple fieldbus protocols via software-selectable impedance. Use Value: Reduces BOM count and inventory complexity while meeting IEC 61158-2 electrical compliance for both standards. | Use Scenario: Providing per-port termination selection in enterprise-grade routers handling mixed E1, T1, and ISDN PRI interfaces on modular line cards. IC Role / Device Role / Timing Role: Low-power, digitally addressed termination block integrated into each port's front-end signal conditioning stage. Use Value: Enables hot-swappable port modules with automatic impedance matching-no manual configuration or external resistors required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switchable termination applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3407EUK+T | Switches between 75Ω (ENABLE = 1) and 120Ω (ENABLE = 0); same package, supply, and temp range | Targeted at coaxial video + E1 hybrid systems-not suitable for T1 or 100Ω-only fieldbuses | Select only if 75Ω termination is required alongside 120Ω; not interchangeable with MAX3408EUK+T due to different low-state value |
| MAX3406EUK+T | Switches between 75Ω (ENABLE = 1) and 100Ω (ENABLE = 0); identical pinout and timing specs | Designed for video + T1 coexistence; lacks 120Ω support needed for E1 or PROFIBUS | Choose when 75Ω/100Ω pairing is mandatory; incompatible with 120Ω-dependent standards like E1 or HART-IP |
Compared with MAX3407EUK+T and MAX3406EUK+T, the MAX3408EUK+T uniquely delivers the 100Ω↔120Ω pair essential for dual-standard telecom and industrial fieldbus designs-neither alternative provides this specific combination, making it non-substitutable in E1/T1 crossover or PROFIBUS/Foundation Fieldbus convergence applications.
Availability
MAX3408EUK+T is available at Aetrix Electronics and suitable for Telecom E1/T1 line termination, Video Security Systems, and Industrial Fieldbus Networks requiring stable component supply, long-term lifecycle assurance, and guaranteed parametric consistency across production lots.
Supply support for MAX3408EUK+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.
The MAX3406/MAX3407/MAX3408 family was designed specifically to replace discrete resistor networks in programmable line-termination applications-delivering precision, low power, and small size for telecom infrastructure and industrial connectivity equipment.
FAQ
What termination values does the MAX3408EUK+T support?
The MAX3408EUK+T supports exactly two termination values: 100Ω when the ENABLE pin is driven high (≥2.0V), and 120Ω when ENABLE is driven low (≤0.8V). These values are guaranteed within ±2.5% across –40°C to +85°C and for differential input voltages from –3.6V to +3.6V. No other resistance states or intermediate values are provided by the MAX3408EUK+T.
Can the MAX3408EUK+T be used in place of a fixed 120Ω resistor?
Yes-the MAX3408EUK+T functions as a precision 120Ω termination when ENABLE is held low, with resistance variation <±1Ω over temperature and signal voltage. Its 120Ω mode matches the accuracy and stability of high-grade discrete resistors but adds reconfigurability. Unlike a fixed resistor, it requires a valid ENABLE logic level and +4.5V to +5.5V supply to maintain specification.
Does the MAX3408EUK+T require external decoupling capacitors?
Yes-the MAX3408EUK+T requires a 0.1µF ceramic capacitor placed between VCC (Pin 1) and GND (Pin 2), mounted as close as possible to the device. This decoupling is mandatory for stable operation and is specified in the official datasheet; omission may cause erratic switching behavior or increased noise susceptibility in the termination path.
What is the maximum operating frequency supported by the MAX3408EUK+T?
The MAX3408EUK+T maintains specified impedance performance up to 36MHz in both 100Ω and 120Ω modes. Impedance deviation remains within ±1Ω below 20MHz and increases gradually beyond-making it suitable for E1 (2.048MHz), T1 (1.544MHz), baseband video, and industrial fieldbus signals, but not for RF or >50MHz serial links.
Is the MAX3408EUK+T pin-compatible with other devices in the MAX3406/MAX3407/MAX3408 family?
Yes-the MAX3408EUK+T shares identical pinout, package (SOT23-5), supply requirements, and logic thresholds with MAX3406EUK+T and MAX3407EUK+T. However, termination values differ: MAX3408EUK+T switches 100Ω↔120Ω, while MAX3406EUK+T is 75Ω↔100Ω and MAX3407EUK+T is 75Ω↔120Ω. Swapping requires firmware or schematic updates to match expected impedance states.
MAX3408EUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Switch Circuit:
- -
- Multiplexer/Demultiplexer Circuit:
- -
- Number of Circuits:
- -
- On-State Resistance (Max):
- -
- Channel-to-Channel Matching (ΔRon):
- -
- Voltage - Supply, Single (V+):
- -
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- -
- -3db Bandwidth:
- -
- Charge Injection:
- -
- Channel Capacitance (CS(off), CD(off)):
- -
- Current - Leakage (IS(off)) (Max):
- -
- Crosstalk:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX3408EUK+T FAQ
1.How can I place an order for MAX3408EUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3408EUK+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 MAX3408EUK+T reliable?
The price and inventory of MAX3408EUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3408EUK+T is usually 5 days.
3.What payment methods are accepted for MAX3408EUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3408EUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3408EUK+T?
MAX3408EUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3408EUK+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 MAX3408EUK+T?
For technical support, including MAX3408EUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3408EUK+T requirements.
6.How does Aetrix verify that MAX3408EUK+T is sourced from the original manufacturer or authorized distributors?
All MAX3408EUK+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 MAX3408EUK+T meets industry standards.
7.What is the process for return or replacement of MAX3408EUK+T?
All MAX3408EUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX3408EUK+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 MAX3408EUK+T part is unused and in its original packaging.
Return procedure for MAX3408EUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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