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Analog Devices Inc./Maxim Integrated ADUM1253AUA+
- Part No.:
- ADUM1253AUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADUM1253AUA+.pdf
- Description:
- TWO CHANNEL, BIDIRECTIONAL I2C D
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
ADUM1253AUA+ from Analog Devices is a dual-channel, ultra-low-power I²C digital isolator with unidirectional SCL and bidirectional SDA channels, 1.71V–5.5V independent VDD1/VDD2 supplies, 21µA per-side standby current, and idle-bus hot-swap capability for side-2 insertion-designed for isolated battery management systems and PoE-powered interfaces.
For engineers reviewing the ADUM1253AUA+ datasheet, ADUM1253AUA+ pinout, ADUM1253AUA+ application, or ADUM1253AUA+ equivalent, key selection factors include its 0.69V/0.4V side-1/side-2 VOL specification enabling compatibility with legacy I²C devices, 2MHz SCL support, reinforced isolation up to 848 VRMS (wide SOIC), and guaranteed operation from –40°C to +125°C.
Technical Context
The ADUM1253AUA+ implements galvanically isolated signal transfer using Analog Devices' iCoupler® technology, with side-1 featuring regulated low-voltage output buffers (VOL = 0.64V typ) and input threshold offset (≥50mV below VOL) to prevent bus latch-up. Side-2 uses conventional CMOS buffers with higher sink strength (50mA).
Its hot-swap logic precharges side-2 SDA/SCL pins, then monitors for I²C bus idle or STOP condition before enabling isolation coupling-ensuring disturbance-free connection during live insertion. Propagation delays range from 35.2ns to 133.3ns depending on supply voltage and load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage (VIOWM) | 848 VRMS continuous - meets reinforced insulation requirements for industrial mains-connected systems |
| Supply Range (VDD1/VDD2) | 1.71V to 5.5V - enables level-shifting between 1.8V, 3.3V, and 5V I²C domains |
| Max Data Rate | 2 MHz SCL - supports fast-mode-plus I²C timing without protocol modification |
| Side-1 VOL (max) | 0.69V at 5mA sink - ensures reliable low-level recognition by standard I²C receivers |
| Side-2 VOL (max) | 0.4V at 50mA sink - allows use of lower pull-up resistors for faster rise times and higher noise immunity |
| Standby Current | 21 µA per side - extends battery life in portable and energy-harvesting applications |
| CMTI | 200 kV/µs - maintains data integrity in high-noise motor drive or power converter environments |
Pinout & Package
ADUM1253AUA+ is housed in an 8-pin MSOP package (Outline 21-0036) with creepage/clearance of 3mm, rated for –40°C to +125°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDA1) | Side-1 bidirectional I²C data | Open-drain output with regulated 0.64V VOL; requires external pull-up on controller side |
| 2 (SCL1) | Side-1 unidirectional I²C clock | Open-drain output only; no input function - enforces master-controlled clock directionality |
| 3 (VDD1) | Side-1 primary supply | 1.71V–5.5V input powering side-1 logic and isolator transmitter; UVLO at 1.48V |
| 4 (GND1) | Side-1 reference ground | Galvanically isolated return path for side-1 circuitry; must not be connected to GND2 |
| 5 (GND2) | Side-2 reference ground | Isolated return for side-2; establishes separation barrier between domains |
| 6 (VDD2) | Side-2 secondary supply | Independent 1.71V–5.5V rail; powers side-2 receiver and hot-swap precharge circuitry |
| 7 (SCL2) | Side-2 unidirectional clock input | Input-only terminal - receives SCL from side-1; no output driver |
| 8 (SDA2) | Side-2 bidirectional I²C data | 50mA sink capable; supports hot-swap precharge and idle-bus detection logic |
Key Features
| Feature | Design Value |
|---|---|
| Idle-bus hot-swap on side-2 | Precharges SDA2/SCL2 to 0.3×VDD2 via 140kΩ Thevenin source, then waits ≥75μs for bus idle before coupling - prevents glitches during live insertion |
| Side-1 regulated VOL | Maintains 0.64V output low with ≥50mV margin below VIH1 threshold - eliminates risk of I²C bus lockup due to threshold overlap |
| Wide dual-supply range | 1.71V–5.5V on both sides enables interoperability across mixed-voltage systems (e.g., 1.8V MCU ↔ 3.3V sensor) |
| Low-capacitance isolation barrier | 1.5pF input-to-output capacitance minimizes crosstalk and preserves I²C rise/fall time integrity |
| Robust ESD protection | ±17kV HBM on I/O pins and ±8kV IEC 61000-4-2 contact discharge - reduces need for external TVS diodes |
Applications
| Isolated Battery Management | Power over Ethernet (PoE) Interface |
|---|---|
Use Scenario: Monitoring cell voltages and temperatures in high-voltage EV battery packs where microcontroller (side-1) must remain at safe earth-referenced potential while sensors (side-2) float at pack voltage. IC Role / Device Role / Timing Role: ADUM1253AUA+ provides galvanic isolation for SMBus/I²C communication between BMS MCU and isolated analog front-end ICs, preserving clock/data integrity across >400V potential differences. Use Value: Enables compliance with IEC 62619 safety standards via 848 VRMS working voltage rating and reinforced isolation structure. | Use Scenario: Interfacing a PoE-powered endpoint device (e.g., IP camera) with upstream PSE controller over I²C for power classification and fault reporting. IC Role / Device Role / Timing Role: ADUM1253AUA+ isolates the I²C bus between the powered device's PHY (side-2) and host MCU (side-1), preventing ground loops and common-mode noise injection from PoE transformer leakage. Use Value: 200 kV/µs CMTI withstands fast transients induced by PoE power switching, eliminating communication errors during power negotiation. |
| Industrial Motor Drive Control | Medical Sensor Isolation |
Use Scenario: Connecting position encoders or current sensors mounted on high-dv/dt motor phases to a central motion controller located in a low-noise control cabinet. IC Role / Device Role / Timing Role: ADUM1253AUA+ serves as the isolated I²C bridge between noisy motor-side peripherals and clean controller-side firmware, supporting real-time feedback at up to 2MHz. Use Value: 0.4V VOL2 at 50mA sink allows aggressive pull-up resistor values (≤1kΩ), achieving <300ns rise times even with 400pF bus capacitance. | Use Scenario: Isolating patient-connected biosensors (e.g., ECG front-end) from diagnostic processing unit to meet IEC 60601-1 creepage/clearance and leakage current requirements. IC Role / Device Role / Timing Role: ADUM1253AUA+ provides basic insulation barrier for I²C configuration and calibration data exchange, with side-1 grounded to patient-isolated system and side-2 referenced to main AC supply. Use Value: 3mm creepage/clearance in MSOP package satisfies 2×MOPP requirements when combined with proper PCB layout spacing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8602AC-B-IS | 2-channel, 5kVRMS reinforced isolation; 1.71–5.5V supplies; but no idle-bus hot-swap or regulated VOL | Lacks side-2 precharge and bus-state monitoring - unsuitable for hot-plug sensor modules | Select when highest isolation voltage is critical and hot-swap is not required |
| ISO1540DR | TI's 2-channel I²C isolator with 3.75kVRMS; includes hot-swap but only 1.65–5.5V VDD2 range and 0.8V VOL2 | Higher VOL2 limits speed with high-capacitance buses; narrower VDD2 range reduces flexibility in low-voltage systems | Select for cost-sensitive designs where 0.8V VOL2 and 1.65V minimum VDD2 are acceptable |
Compared with SI8602AC-B-IS and ISO1540DR, ADUM1253AUA+ uniquely combines 0.69V/0.4V dual-VOL optimization, true idle-bus hot-swap, and 848 VRMS working voltage in a compact MSOP - making it optimal for battery-powered, field-serviceable, and high-reliability I²C isolation.
Availability
ADUM1253AUA+ is available at Aetrix Electronics and suitable for battery management systems, Power over Ethernet interfaces, and industrial motor control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADUM1253AUA+ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The ADuM1253 product line delivers robust, low-power digital isolation for I²C and SMBus protocols - specifically engineered to solve bus contention, ground loop, and hot-swap challenges in safety-critical and battery-constrained systems.
FAQ
What is the maximum operating temperature range for ADUM1253AUA+?
The ADUM1253AUA+ is rated for continuous operation from –40°C to +125°C ambient temperature, validated across all electrical specifications and isolation parameters. This range is supported by its 8-pin MSOP package thermal characteristics (θJA = 324°C/W) and internal design margins, making it suitable for under-hood automotive, industrial motor drives, and outdoor telecom equipment where thermal stress is significant. The junction temperature limit remains +150°C per Absolute Maximum Ratings.
Does ADUM1253AUA+ support bidirectional data transfer on both SDA and SCL lines?
No - ADUM1253AUA+ implements unidirectional clock (SCL1→SCL2 only) and bidirectional data (SDA1↔SDA2) transfer, matching standard I²C protocol requirements. SCL1 is output-only on side-1 and input-only on side-2; SDA1 and SDA2 are open-drain bidirectional ports with side-specific VOL regulation. This architecture prevents clock domain conflicts and ensures deterministic bus arbitration in isolated multi-master systems.
How does the idle-bus hot-swap feature work in ADUM1253AUA+?
Upon power-up of side-2, ADUM1253AUA+ precharges SDA2 and SCL2 to 0.3×VDD2 through a 140kΩ internal Thevenin source, then monitors for ≥75μs of bus idle (both lines high) or detection of an I²C STOP condition before enabling the isolation path. This sequence prevents false START/STOP generation and data corruption during live insertion of side-2 peripherals - a requirement for modular sensor nodes and field-replaceable PoE modules.
What is the significance of the 0.69V VOL specification on side-1 of ADUM1253AUA+?
The 0.69V maximum output low voltage on side-1 (SDA1/SCL1) ensures compatibility with legacy I²C devices that specify VIH(min) ≤ 0.7×VDD - particularly older 5V or 3.3V peripherals with marginal noise margins. Combined with a side-1 input threshold (VIH1) ≥50mV higher than VOL, this guarantees a fail-safe voltage gap that prevents bus latch-up during repeated low-level assertion, a known failure mode in non-regulated isolators.
Can ADUM1253AUA+ operate with different supply voltages on side-1 and side-2?
Yes - ADUM1253AUA+ supports independent VDD1 and VDD2 supplies ranging from 1.71V to 5.5V each, enabling seamless level shifting between disparate logic domains (e.g., 1.8V MCU ↔ 5V sensor). The device maintains full 2MHz I²C functionality and specified VOL/VIL thresholds across all valid combinations, with no external level translators required. This simplifies mixed-voltage system design and reduces BOM count in complex embedded platforms.
ADUM1253AUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- CAN, I2C
- Isolated Power:
- No
- Number of Channels:
- 3
- Inputs - Side 1/Side 2:
- 2/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 200kV/µs
- Data Rate:
- 2MHz
- Propagation Delay tpLH / tpHL (Max):
- 50ns, 133.3ns
- Pulse Width Distortion (Max):
- 94.2ns
- Rise / Fall Time (Typ):
- -, 20.3ns
- Voltage - Supply:
- 1.71V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µMAX
ADUM1253AUA+ FAQ
1.How can I place an order for ADUM1253AUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM1253AUA+ 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 ADUM1253AUA+ reliable?
The price and inventory of ADUM1253AUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM1253AUA+ is usually 5 days.
3.What payment methods are accepted for ADUM1253AUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM1253AUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM1253AUA+?
ADUM1253AUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM1253AUA+ 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 ADUM1253AUA+?
For technical support, including ADUM1253AUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM1253AUA+ requirements.
6.How does Aetrix verify that ADUM1253AUA+ is sourced from the original manufacturer or authorized distributors?
All ADUM1253AUA+ 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 ADUM1253AUA+ meets industry standards.
7.What is the process for return or replacement of ADUM1253AUA+?
All ADUM1253AUA+ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM1253AUA+, 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 ADUM1253AUA+ part is unused and in its original packaging.
Return procedure for ADUM1253AUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM1253AUA+ Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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