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Analog Devices Inc./Maxim Integrated ADUM1253ASA+
- Part No.:
- ADUM1253ASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADUM1253ASA+.pdf
- Description:
- TWO CHANNEL, BIDIRECTIONAL I2C D
- Quantity:
- Payment:
- Shipping:
Inventory:864
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Product details
Overview
ADUM1253ASA+ from Analog Devices is an ultra-low-power, bidirectional I²C digital isolator with unidirectional SCL channel, 1.71V–5.5V dual-supply operation, 2MHz max data rate, and idle-bus hot-swap capability on side 2. It enables isolated communication between microcontrollers and I²C peripherals in battery-powered industrial sensors and PoE-powered systems.
For engineers reviewing the ADUM1253ASA+ datasheet, ADUM1253ASA+ pinout, ADUM1253ASA+ application, or ADUM1253ASA+ equivalent, key selection criteria include side-1 regulated VOL (0.69V max), side-2 current sinking (50mA), VIOWM (445 VRMS for narrow SOIC), -40°C to +125°C operating range, and hot-swap precharge timing (102 ms enable, 75 µs idle detection).
Technical Context
The ADUM1253ASA+ implements galvanic isolation using iCoupler® technology with two independent open-drain channels: SDA1/SCL1 (side 1) uses regulated low-voltage output buffers (VOL1 = 0.64V typ) and logic-low input threshold ≥50 mV lower to prevent bus latch-up; SDA2/SCL2 (side 2) uses conventional CMOS buffers with higher sink capability (50mA) and voltage-dependent thresholds (VIH2 = 0.52×VDD2, VIL2 = 0.38×VDD2).
Its idle-bus hot-swap function operates by precharging side-2 pins to 0.3×VDD2 via 140 kΩ Thevenin impedance, then detecting bus idle or STOP condition before enabling isolation path-ensuring disturbance-free connection during live insertion. Propagation delays are asymmetric: tPLH12/tPHL12 = 35.2–51.6 ns / 75.6–133.3 ns across supply voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage (VIOWM) | 445 VRMS continuous - meets reinforced insulation requirements for 300 VRMS mains-connected systems per IEC 62368-1. |
| Supply Range (VDD1/VDD2) | 1.71V to 5.5V - supports level-shifting between 1.8V/3.3V/5V domains without external translators. |
| Max Data Rate | 2 MHz - enables full-speed I²C operation (400 kHz standard, 1 MHz fast-mode plus) with margin. |
| Side-1 VOL (max) | 0.69V at 5mA sink - ensures compatibility with legacy I²C devices requiring ≤0.7V logic-low threshold. |
| Side-2 Sink Current | 50mA - allows use of lower pull-up resistors (e.g., 1.2kΩ at 3.3V) for faster rise times and higher noise immunity. |
| Hot-Swap Enable Time | 102 ms after power-up - provides sufficient delay for side-2 supply stabilization before bus monitoring begins. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, motor drive, and industrial control environments. |
Pinout & Package
ADUM1253ASA+ is supplied in an 8-pin narrow-body SOIC package (Outline 21-0041) with creepage/clearance ≥4 mm and material group I per IEC 60112.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Side 1 interface (GND1, SCL1, SDA1, VDD1) | Primary-side I²C bus side with regulated low-VOL output and latch-up prevention logic. |
| 5, 6, 7, 8 | Side 2 interface (GND2, SCL2, SDA2, VDD2) | Secondary-side I²C bus side with high-current sinking, hot-swap precharge, and voltage-scaled thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low standby current | 21 µA per side - extends battery life in portable medical monitors and wireless sensor nodes. |
| Side-1 regulated VOL | 0.64V typical (≤0.69V max) - guarantees reliable low-level signaling to I²C slaves with tight VIHmin specs. |
| Side-2 hot-swap precharge | 0.3×VDD2 at 140 kΩ Thevenin - eliminates bus glitches during live insertion into powered systems. |
| Asymmetric propagation delay | tPLH12 = 35.2–51.6 ns, tPHL12 = 75.6–133.3 ns - preserves I²C timing margins while minimizing cross-talk-induced setup violations. |
| High CMTI | 200 kV/µs - maintains signal integrity in noisy motor drives and inverters with rapid ground potential shifts. |
Applications
| Isolated I²C Interface | Battery Management System |
|---|---|
Use Scenario: Isolating microcontroller I²C bus from high-voltage battery cell monitors in EV traction packs. IC Role / Device Role / Timing Role: ADUM1253ASA+ acts as a bidirectional data isolator with unidirectional clock path, enabling safe readout of cell voltage/temperature telemetry across 445 VRMS barrier. Use Value: Prevents ground loop currents and fault propagation while supporting 2MHz burst reads for real-time state-of-charge calculation. |
Use Scenario: Connecting fuel gauge ICs to host MCU in portable medical devices powered by Li-ion batteries. IC Role / Device Role / Timing Role: ADUM1253ASA+ serves as ultra-low-power I²C isolator on side-1 (1.8V MCU) and side-2 (3.3V gauge IC), leveraging 21 µA standby current. Use Value: Extends device runtime by >15% versus standard isolators, with hot-swap support enabling field-replaceable battery modules. |
| Power over Ethernet | Motor Control System |
Use Scenario: Isolating I²C configuration and status interface between PoE PD controller and isolated MCU in IEEE 802.3bt systems. IC Role / Device Role / Timing Role: ADUM1253ASA+ bridges 5V PD-side I²C to 3.3V MCU-side I²C with side-2 hot-swap, tolerating transient surges up to ±10kV per IEC 61000-4-5. Use Value: Enables robust firmware updates and fault reporting across isolation barrier without bus lockup during power cycling. |
Use Scenario: Interfacing isolated position encoder feedback to motor control MCU in servo drives. IC Role / Device Role / Timing Role: ADUM1253ASA+ isolates SDA/SCL lines between encoder ASIC (side-2, 5V) and MCU (side-1, 3.3V), handling common-mode transients >200 kV/µs. Use Value: Eliminates encoder data corruption caused by switching noise from IGBT gate drivers, ensuring precise commutation timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO1540DR | Single-channel, 1Mbps max, no hot-swap, 100 µA side-1 supply current | Lacks side-2 precharge and idle-bus detection; unsuitable for live-insertion scenarios | Choose ISO1540DR only for cost-sensitive, non-hot-swap applications with <1MHz bandwidth needs. |
| ADUM1250ARZ | Same architecture but wide-body SOIC (848 VRMS VIOWM), higher creepage (8 mm), 5000 VRMS VISO | Required for systems needing >445 VRMS working voltage or enhanced surge immunity (IEC 61000-4-5 Level 4) | Select ADUM1250ARZ when regulatory compliance demands 848 VRMS continuous isolation or 5000 VRMS withstand rating. |
Compared with ISO1540DR, ADUM1253ASA+ delivers 2× data rate, 80% lower standby current, and essential hot-swap functionality; versus ADUM1250ARZ, it trades higher isolation rating for smaller footprint and lower cost in space-constrained 445 VRMS designs.
Availability
ADUM1253ASA+ is available at Aetrix Electronics and suitable for isolated I²C interfaces, battery management systems, and Power over Ethernet applications requiring stable component supply, RoHS-compliant packaging, and extended temperature operation.
Supply support for ADUM1253ASA+ 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 ADUM1253ASA+ belongs to Analog Devices' iCoupler® digital isolator product line, engineered specifically for robust, low-power, and hot-pluggable I²C/SMBus isolation in safety-critical embedded systems.
FAQ
What is the maximum working isolation voltage (VIOWM) rating for ADUM1253ASA+?
The ADUM1253ASA+ has a maximum working isolation voltage (VIOWM) of 445 VRMS, certified for reinforced insulation in pollution degree 2 environments per IEC 60747-17. This rating applies specifically to the 8-pin narrow-body SOIC package (Outline 21-0041) and supports continuous operation in 300 VRMS mains-connected systems compliant with IEC 62368-1.
Does ADUM1253ASA+ support true bidirectional data transfer on both SDA and SCL lines?
No - ADUM1253ASA+ implements unidirectional clock (SCL1→SCL2 only) and bidirectional data (SDA1↔SDA2) paths, matching standard I²C protocol requirements. The SCL channel is strictly one-way to prevent clock contention, while SDA uses open-drain coupling with side-1 regulation and side-2 high-current sinking to enable full bidirectional communication.
How does the hot-swap feature of ADUM1253ASA+ prevent bus corruption during live insertion?
ADUM1253ASA+ prevents bus corruption by first precharging side-2 SDA2/SCL2 pins to 0.3×VDD2 via internal 140 kΩ impedance, then monitoring for either an idle bus condition or I²C STOP signal for ≥75 µs before connecting the isolation path. This ensures side-1 and side-2 buses are synchronized and quiescent prior to coupling, eliminating glitches during live insertion into powered systems.
What is the minimum supply voltage required for reliable operation of ADUM1253ASA+ on both sides?
ADUM1253ASA+ requires a minimum supply voltage of 1.71V on both VDD1 and VDD2 for guaranteed operation across the full -40°C to +125°C temperature range. Below this threshold, undervoltage lockout (UVLO) activates at 1.48V (rising) with 30 mV hysteresis, disabling outputs until supplies stabilize above 1.6V.
Can ADUM1253ASA+ be used with 1.8V logic on side 1 and 5V logic on side 2 simultaneously?
Yes - ADUM1253ASA+ supports independent 1.71V–5.5V supplies on VDD1 and VDD2, enabling direct level shifting between 1.8V microcontrollers (side 1) and 5V I²C peripherals (side 2). Side-1 input thresholds (VIH1 = 0.52–0.62V, VIL1 = 0.47–0.56V) remain valid at 1.8V, while side-2 thresholds scale with VDD2 (VIH2 = 0.52×VDD2, VIL2 = 0.38×VDD2), ensuring interoperability.
ADUM1253ASA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- CAN, I2C
- Isolated Power:
- Yes
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 2/1
- Channel Type:
- Bidirectional, Unidirectional
- Voltage - Isolation:
- 3000Vrms
- 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):
- -, 36.1ns
- Voltage - Supply:
- 1.71V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADUM1253ASA+ FAQ
1.How can I place an order for ADUM1253ASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM1253ASA+ 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 ADUM1253ASA+ reliable?
The price and inventory of ADUM1253ASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM1253ASA+ is usually 5 days.
3.What payment methods are accepted for ADUM1253ASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM1253ASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM1253ASA+?
ADUM1253ASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM1253ASA+ 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 ADUM1253ASA+?
For technical support, including ADUM1253ASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM1253ASA+ requirements.
6.How does Aetrix verify that ADUM1253ASA+ is sourced from the original manufacturer or authorized distributors?
All ADUM1253ASA+ 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 ADUM1253ASA+ meets industry standards.
7.What is the process for return or replacement of ADUM1253ASA+?
All ADUM1253ASA+ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM1253ASA+, 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 ADUM1253ASA+ part is unused and in its original packaging.
Return procedure for ADUM1253ASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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