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Analog Devices Inc./Maxim Integrated MAX4825ETP+
- Part No.:
- MAX4825ETP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX4825ETP+.pdf
- Description:
- IC PWR DRIVER N-CHAN 1:8 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
MAX4825ETP+ from Maxim Integrated is an 8-channel parallel-input relay driver IC for +3.3V/+5V non-latching and dual-coil-latching relays, featuring 2.7Ω typical on-resistance, guaranteed 70mA minimum sink current per channel, Zener-based kickback protection for fast recovery, and SET/RESET global control. It targets high-reliability redundancy switching in DSL/T1/E1/T3/E3 line protection systems.
For engineers reviewing the MAX4825ETP+ datasheet, MAX4825ETP+ pinout, MAX4825ETP+ application, or MAX4825ETP+ equivalent, this page delivers verified electrical specs, parallel interface timing, thermal shutdown behavior, relay drive voltage limits, and real-world use cases in telecom infrastructure and industrial test equipment.
Technical Context
The MAX4825ETP+ implements a 4-bit parallel interface: A0–A2 select one of eight open-drain outputs (OUT1–OUT8), while LVL determines on/off state; CS rising edge latches both address and level. All digital inputs feature Schmitt-trigger hysteresis for noise immunity with slow-rising signals from optocouplers or RC power-up circuits.
Each output is an independent open-drain driver with built-in Zener clamping (7.0–10.5V clamp voltage) to suppress inductive kickback during relay coil de-energization. The device operates from 2.3V to 5.5V supply, supports -40°C to +85°C ambient, and integrates thermal shutdown at +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface Type | 4-bit parallel (A0/A1/A2 address + LVL level control); no serial interface |
| Output Drive Capability | Guaranteed 70mA min sink per channel; 5Ω max RON ensures low power loss at full load |
| Zener Clamp Voltage | 7.0–10.5V - safely absorbs relay coil back-EMF without external components |
| Quiescent Current | ≤300µA max - enables low-power standby in always-on telecom protection modules |
| Supply Voltage Range | 2.3V to 5.5V - compatible with both +3.3V and +5V system rails |
| Turn-On/Turn-Off Time | 1µs / 3µs (RL = 50Ω, CL = 50pF) - supports rapid relay sequencing in ATE applications |
| Operating Temperature | -40°C to +85°C - qualified for extended industrial and telecom environments |
Pinout & Package
MAX4825ETP+ uses a 4mm × 4mm, 20-pin thin QFN package with exposed pad (EP) for thermal dissipation; EP must be soldered to GND. Pin functions are validated per Maxim's official pin description for MAX4824/MAX4825.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Global reset input | Active-low signal clears all output latches; overrides SET and parallel inputs |
| 2 CS | Chip-select input | Falling edge captures A0–A2 address; rising edge latches LVL and updates selected output |
| 3 LVL | Level control input | High = turn on addressed output; Low = turn off addressed output |
| 4–6 A0, A1, A2 | 3-bit output address bus | Binary-encoded selection of OUT1–OUT8 (e.g., A2A1A0 = 111 selects OUT8) |
| 7 GND | Analog ground | Reference for logic inputs and internal circuitry; connect to system ground plane |
| 8–9, 11–12, 14–15, 17–18 OUT1–OUT8 | Open-drain relay driver outputs | Sink current to PGND; require external pull-up to relay coil supply (e.g., +5V) |
| 10, 16 PGND | Power ground | Return path for output sink currents; tie directly to GND and exposed pad |
| 13 PSAVE | Power-save control | Not functional in MAX4825ETP+ (power-save disabled per Selector Guide); leave unconnected or grounded |
| 19 VCC | Supply input | 2.3V–5.5V operation; bypass with 0.1µF ceramic capacitor close to pin |
| 20 SET | Global set input | Active-low signal forces all outputs ON; overrides parallel control but not RESET |
| EP | Exposed thermal pad | Must be soldered to GND for thermal performance and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Parallel 4-bit interface | Enables direct microcontroller GPIO control without SPI peripheral or clock resource overhead |
| Zener kickback protection | Eliminates need for external flyback diodes; reduces PCB area and BOM count in multi-relay systems |
| SET/RESET global control | Single-pin activation/deactivation of all 8 channels - critical for emergency fail-safe shutdown in telecom gear |
| Schmitt-trigger inputs | Accepts slow-rising signals from optocouplers or RC power-up circuits without external hysteresis components |
| Thermal shutdown | Auto-disable at +150°C junction temperature prevents latch-up or damage during sustained overload |
Applications
| DSL Redundancy Protection | T1/E1 Line Protection |
|---|---|
|
Use Scenario: Automatic switchover between primary and backup ADSL/VDSL lines upon fault detection. IC Role / Device Role / Timing Role: Parallel-controlled relay driver enabling fast, deterministic switching of line interface circuits. Use Value: Eliminates manual intervention and minimizes service interruption time using sub-µs output timing and robust overvoltage clamping. |
Use Scenario: Fault-tolerant routing in carrier-grade T1/E1 multiplexers where line continuity is mission-critical. IC Role / Device Role / Timing Role: Eight-channel relay interface managing physical layer path selection under software or hardware control. Use Value: Supports hot-swap capability and automatic failover via SET/RESET pins without firmware delay. |
| Industrial Test Equipment | ATE Signal Routing |
|
Use Scenario: Reconfigurable signal path switching in benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: High-reliability relay driver handling low-level analog signal paths with minimal crosstalk and leakage. Use Value: 1µA max output off-leakage ensures measurement integrity; 2.7Ω RON preserves signal fidelity in 50Ω systems. |
Use Scenario: Automated test equipment requiring precise, repeatable relay sequencing across hundreds of DUT connections. IC Role / Device Role / Timing Role: Parallel-addressed relay controller synchronized to test sequencer via CS strobe. Use Value: 1µs turn-on time enables tight timing windows; daisy-chain-capable architecture scales to large relay matrices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel relay driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4824ETP+ | Identical pinout and parallel interface, but includes functional PSAVE pin for programmable power-save mode | Preferred where relay hold-current optimization is required to reduce thermal load in dense PCB layouts | Select MAX4824ETP+ if power-save functionality is needed; otherwise MAX4825ETP+ offers simpler layout and lower cost |
| TI ULN2803ADWR | 8-channel Darlington array; no Zener clamp, no SET/RESET, higher VCE(sat) (~1.3V), no thermal shutdown | Used in legacy 5V logic systems with resistive loads; unsuitable for fast-switching relay coils without external flyback diodes | Choose ULN2803ADWR only for cost-sensitive, non-critical 5V relay applications lacking thermal or EMI constraints |
Compared with MAX4824ETP+, MAX4825ETP+ removes power-save functionality to simplify design and reduce component count; compared with ULN2803ADWR, it delivers faster switching, integrated protection, and industrial temperature support - making it optimal for telecom redundancy and precision test systems.
Availability
MAX4825ETP+ is available at Aetrix Electronics and suitable for DSL redundancy protection, T1/E1 line protection, and industrial test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX4825ETP+ 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, telecom, and automotive applications.
The MAX4822–MAX4825 family was engineered specifically for high-reliability relay control in telecom infrastructure, offering integrated protection, parallel/serial flexibility, and thermal safety - with MAX4825ETP+ optimized for fixed-function, low-complexity relay switching.
FAQ
What interface does the MAX4825ETP+ use, and how is it controlled?
The MAX4825ETP+ uses a 4-bit parallel interface: three address bits (A0–A2) select one of eight outputs (OUT1–OUT8), and the LVL bit determines on/off state. Control occurs on the rising edge of CS, which latches both address and level data simultaneously. Unlike serial variants, MAX4825ETP+ has no DIN/SCLK/DOUT pins and cannot be daisy-chained. This interface allows direct GPIO control from microcontrollers without clock or shift-register overhead.
Does the MAX4825ETP+ support power-save mode?
No, the MAX4825ETP+ does not support power-save mode. Per Maxim's Selector Guide, only MAX4822 and MAX4824 include functional PSAVE capability; MAX4825ETP+ has the PSAVE pin reserved (NC) and power-save is disabled. The device operates in full-drive mode at all times, delivering full 70mA sink current to activated relays. This simplifies design for applications where relay hold-current reduction is unnecessary.
What is the maximum relay coil voltage the MAX4825ETP+ can switch?
The MAX4825ETP+ output drivers are rated for OUT_ voltages up to +11V absolute maximum, with Zener clamping active at 7.0–10.5V. This allows safe switching of +3.3V and +5V relay coils, including those generating inductive kickback exceeding VCC. The device is not rated for direct switching of >12V coils; external clamping or voltage limiting is required beyond its specified clamp range.
How does the SET and RESET functionality work on the MAX4825ETP+?
SET (pin 20) and RESET (pin 1) are active-low global control inputs. Driving SET low forces all eight outputs ON (low-impedance sink), overriding parallel address/data. Driving RESET low forces all outputs OFF (high-impedance), clearing all latches. RESET takes precedence over SET - if both are asserted simultaneously, outputs go OFF. These pins enable hardware-level fail-safe control independent of software or interface timing.
What package type and thermal requirements apply to the MAX4825ETP+?
MAX4825ETP+ uses a 4mm × 4mm, 20-pin thin QFN package with exposed thermal pad (EP). The EP must be soldered to a solid GND plane for thermal dissipation and EMI suppression. At TA = +70°C, continuous power dissipation is 1350mW (derated 16.9mW/°C above +70°C). Thermal shutdown activates at +150°C junction temperature, disabling all outputs until cooldown.
MAX4825ETP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 20-WFQFN Exposed Pad
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Switch Type:
- Relay, Solenoid Driver
- Number of Outputs:
- 8
- Ratio - Input:Output:
- 1:8
- Output Configuration:
- Low Side
- Output Type:
- N-Channel
- Interface:
- Parallel
- Voltage - Load:
- 2.3V ~ 5.5V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 70mA
- Rds On (Typ):
- 2.7Ohm
- Input Type:
- Non-Inverting
- Features:
- -
- Fault Protection:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (4x4)
MAX4825ETP+ FAQ
1.How can I place an order for MAX4825ETP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4825ETP+ 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 MAX4825ETP+ reliable?
The price and inventory of MAX4825ETP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4825ETP+ is usually 5 days.
3.What payment methods are accepted for MAX4825ETP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4825ETP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4825ETP+?
MAX4825ETP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4825ETP+ 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 MAX4825ETP+?
For technical support, including MAX4825ETP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4825ETP+ requirements.
6.How does Aetrix verify that MAX4825ETP+ is sourced from the original manufacturer or authorized distributors?
All MAX4825ETP+ 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 MAX4825ETP+ meets industry standards.
7.What is the process for return or replacement of MAX4825ETP+?
All MAX4825ETP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4825ETP+, 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 MAX4825ETP+ part is unused and in its original packaging.
Return procedure for MAX4825ETP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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