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Analog Devices Inc./Maxim Integrated ADUM1253ASA+T
- Part No.:
- ADUM1253ASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADUM1253ASA+T.pdf
- Description:
- TWO CHANNEL, BIDIRECTIONAL I2C D
- Quantity:
- Payment:
- Shipping:
Inventory:2,350
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Product details
Overview
ADUM1253ASA+T 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 and PoE interface applications.
For engineers reviewing the ADUM1253ASA+T datasheet, ADUM1253ASA+T pinout, ADUM1253ASA+T application, or ADUM1253ASA+T equivalent, key selection criteria include side-specific VOL (0.69V on side 1, 0.4V on side 2), 2 MHz max SCL rate, reinforced isolation up to 848 VRMS (wide SOIC), and hot-swap precharge timing (102 ms enable, 75 µs idle detection).
Technical Context
The ADUM1253ASA+T implements galvanically isolated signal transfer using iCoupler® technology, with side-1 featuring regulated low-voltage output buffers (VOL = 0.64V nominal) and side-2 using conventional open-drain drivers capable of 50 mA sink. Its architecture prevents bus latch-up via ΔVO/IT ≥ 45 mV margin between side-1 output low and input high thresholds.
Hot-swap operation is enabled by internal precharge circuitry (VPRECHG = 0.3 × VDD2, RPRECHG = 140 kΩ) and state monitoring that connects side-1 to side-2 only after detecting an idle bus or STOP condition-ensuring disturbance-free insertion without data corruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage (VIOWM) | 848 VRMS (wide SOIC package)-supports reinforced insulation in industrial mains-connected systems up to 600 VRMS overvoltage category IV. |
| Max Data Rate | 2 MHz SCL clock-enables full-speed I²C communication (400 kHz standard, 1 MHz fast-mode plus) across isolation barrier. |
| VOL (Side 1 / Side 2) | 0.69 V / 0.4 V at rated sink current-ensures compatibility with legacy I²C devices requiring low logic-low voltage, especially on side-1 where regulation prevents latch-up. |
| Supply Range (VDD1/VDD2) | 1.71 V to 5.5 V independently-allows level-shifting between 1.8 V microcontrollers and 3.3 V or 5 V peripherals without external translators. |
| Standby Current | 21 µA per side-extends battery life in portable BMS and sensor nodes where I²C bus remains active but idle for extended periods. |
| CMTI | 200 kV/µs-maintains signal integrity in noisy motor drive or power supply environments with rapid common-mode transients. |
| Hot-Swap Enable Time | 102 ms after power-up-guarantees safe side-2 connection only after internal initialization and bus readiness verification. |
Pinout & Package
ADUM1253ASA+T is packaged in an 8-pin wide-body SOIC (SOIC_W) with creepage/clearance ≥ 8 mm, rated for -40°C to +125°C ambient operation. Pin functions are electrically isolated across two sides: pins 1–4 (side 1) and pins 5–8 (side 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (SDA1) | Side-1 bidirectional data line | Open-drain I²C SDA channel with regulated 0.64 V logic-low output; requires external pull-up on side 1. |
| Pin 2 (SCL1) | Side-1 unidirectional clock line | Open-drain I²C SCL input only; no output driver-clock signals flow side-1 → side-2 only. |
| Pin 3 (VDD1) | Side-1 power supply | 1.71 V–5.5 V supply for side-1 logic and isolation transmitter; UVLO threshold 1.6 V. |
| Pin 4 (GND1) | Side-1 reference ground | Return path for side-1 signals and supply; galvanically isolated from GND2. |
| Pin 5 (GND2) | Side-2 reference ground | Return path for side-2 signals and supply; isolated from GND1; used as reference for hot-swap precharge. |
| Pin 6 (VDD2) | Side-2 power supply | 1.71 V–5.5 V supply for side-2 logic and isolation receiver; enables hot-swap precharge when powered. |
| Pin 7 (SCL2) | Side-2 unidirectional clock line | Open-drain output mirroring SCL1; driven only by side-1; supports 2 MHz toggle rate. |
| Pin 8 (SDA2) | Side-2 bidirectional data line | Open-drain I²C SDA with 50 mA sink capability; supports bidirectional data transfer synchronized to SCL2. |
Key Features
| Feature | Design Value |
|---|---|
| Side-1 regulated VOL | 0.69 V max ensures ≥45 mV noise margin vs. side-1 VIH (0.56 V), eliminating bus latch-up risk in multi-master I²C topologies. |
| Side-2 hot-swap precharge | Internal 140 kΩ Thevenin source pulls SDA2/SCL2 to 0.3 × VDD2 at power-up, preventing glitches during live insertion into active buses. |
| Dual-supply level shifting | Independent 1.71 V–5.5 V VDD1/VDD2 rails allow direct interfacing between 1.8 V SoCs and 5 V sensors or power controllers without external level shifters. |
| High-current side-2 sink | 50 mA output drive on SDA2/SCL2 enables use of lower-value pull-ups (e.g., 1 kΩ), reducing rise time and supporting >1 MHz I²C speeds on side 2. |
| Reinforced isolation rating | 848 VRMS working voltage (wide SOIC) meets IEC 62368-1 basic insulation requirements for PoE-powered equipment and industrial gateways. |
Applications
| Isolated Battery Management System | Power over Ethernet (PoE) Interface |
|---|---|
Use Scenario: Monitoring cell voltages and temperatures in high-voltage EV battery packs where MCU (side 1) operates at low voltage while sensing circuitry (side 2) floats at battery stack potential. IC Role / Device Role / Timing Role: ADUM1253ASA+T isolates I²C control and telemetry between isolated domains, transmitting SCL unidirectionally and SDA bidirectionally at up to 400 kHz while maintaining <100 ns propagation skew. Use Value: Enables safe, low-power communication across 848 VRMS isolation barrier without external level shifters or optocouplers-reducing BOM count and PCB area. | Use Scenario: Isolating I²C configuration and status reporting between PoE PSE controller (side 1) and powered device (PD) ASIC (side 2) in IEEE 802.3af/at/bt systems. IC Role / Device Role / Timing Role: ADUM1253ASA+T serves as the sole isolation interface for PD identification, power classification, and fault reporting-supporting hot-plug insertion of PD modules without bus disruption. Use Value: Idle-bus hot-swap logic (102 ms enable, 75 µs idle detect) prevents arbitration loss or STOP corruption during live PD attachment-critical for field-serviceable network infrastructure. |
| Industrial Motor Drive Feedback | Medical Sensor Hub Interface |
Use Scenario: Connecting isolated current/voltage sensing ICs (side 2) to main controller (side 1) in servo drives where PWM noise exceeds 200 kV/µs common-mode transients. IC Role / Device Role / Timing Role: ADUM1253ASA+T provides robust galvanic isolation for calibration and fault-reporting I²C traffic, with CMTI ≥ 200 kV/µs ensuring reliable operation near IGBT switching nodes. Use Value: Eliminates ground-loop errors and EMI-induced communication failures-improving torque accuracy and enabling predictive maintenance via consistent sensor telemetry. | Use Scenario: Interfacing isolated patient-worn biosensors (side 2) to central diagnostic unit (side 1) in Class II medical devices requiring reinforced insulation per IEC 60601-1. IC Role / Device Role / Timing Role: ADUM1253ASA+T delivers I²C isolation with 848 VRMS working voltage and pending IEC 62368-1 certification-meeting creepage (8 mm) and clearance (8 mm) requirements for 2×MOPP patient protection. Use Value: Reduces design validation effort by integrating certified isolation into single-chip solution-accelerating time-to-market for FDA-cleared wearable diagnostics platforms. |
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 | Single 2.5 kVrms reinforced isolation rating; 5 V-only VDD range; no side-specific VOL regulation or hot-swap precharge. | Lacks idle-bus hot-swap and regulated side-1 VOL-unsuitable for live-insertion BMS or latch-prone multi-master I²C buses. | Select when only basic 5 V I²C isolation is needed and hot-swap reliability is not required. |
| ISO1540DR | 3.75 kVrms isolation; 3–5.5 V VDD; no side-1 regulation; 1.5 mA typical quiescent current per side-10× higher than ADUM1253ASA+T. | Higher power consumption limits use in battery-powered edge nodes; lacks precharge and idle-detection logic for side-2 hot-swap. | Choose for cost-sensitive industrial controls where standby current is non-critical and hot-swap is not deployed. |
Compared with Si8602AC-B-IS and ISO1540DR, ADUM1253ASA+T uniquely combines ultra-low 21 µA standby current, side-1 VOL regulation for latch-up immunity, and deterministic idle-bus hot-swap-making it the only option qualified for battery-constrained, live-serviceable I²C systems requiring reinforced isolation.
Availability
ADUM1253ASA+T is available at Aetrix Electronics and suitable for isolated battery management systems, Power over Ethernet interfaces, and industrial motor control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant wide-body SOIC packaging.
Supply support for ADUM1253ASA+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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and healthcare markets.
The ADuM1253 product line delivers low-power, hot-swap-capable I²C isolation for safety-critical and energy-sensitive systems-designed specifically for battery-powered BMS, PoE endpoints, and medical sensor hubs demanding reinforced insulation and deterministic bus behavior.
FAQ
What is the maximum SCL clock frequency supported by the ADUM1253ASA+T?
The ADUM1253ASA+T supports a maximum SCL clock frequency of 2 MHz, enabling full-speed I²C communication including Fast-mode Plus (1 MHz) and custom high-speed implementations. This rating holds across the full operating temperature range (-40°C to +125°C) and supply range (1.71 V to 5.5 V), verified per the Electrical Characteristics table in the official Analog Devices datasheet Rev 1 (May 2024). Performance is maintained with CL ≤ 400 pF on side 2 and appropriate pull-up resistors.
Does the ADUM1253ASA+T require external pull-up resistors on both sides of the isolation barrier?
Yes, the ADUM1253ASA+T requires external pull-up resistors on both SDA1/SCL1 (side 1) and SDA2/SCL2 (side 2) because all four I/O pins are open-drain. Side-2's 50 mA sink capability allows lower-value pull-ups (e.g., 1 kΩ) to achieve faster rise times for >1 MHz operation, while side-1's regulated VOL permits higher pull-up values without violating I²C low-level specifications. No internal pull-ups are integrated.
How does the hot-swap functionality of the ADUM1253ASA+T prevent data corruption during live insertion?
The ADUM1253ASA+T prevents data corruption during live side-2 insertion by first precharging SDA2/SCL2 to 0.3 × VDD2 via a 140 kΩ internal resistor, then waiting 102 ms for internal initialization, and finally monitoring for either an idle bus condition or I²C STOP bit before connecting side-1 to side-2. This sequence-documented in the Hot Swap/BUS STUCK TIMER section-ensures no spurious transitions occur on the bus during power-up transients or partial initialization states.
What isolation ratings apply to the ADUM1253ASA+T package variant?
The ADUM1253ASA+T is specified in the 8-pin wide-body SOIC package (outline 21-100415), which carries a maximum working isolation voltage (VIOWM) of 848 VRMS, reinforced repetitive peak voltage (VIORM) of 1200 VPEAK, and 5000 VRMS withstand voltage (VISO) for 60 seconds. These ratings are validated per IEC 60747-17 and align with pending UL 1577 and IEC 62368-1 certifications for basic insulation in PoE and industrial equipment.
Can the ADUM1253ASA+T operate with different supply voltages on side 1 and side 2?
Yes, the ADUM1253ASA+T supports independent supply voltages from 1.71 V to 5.5 V on VDD1 and VDD2, enabling true level-shifting I²C isolation-for example, interfacing a 1.8 V microcontroller (side 1) with a 5 V sensor (side 2). The device maintains full 2 MHz data rate, regulated VOL on side 1, and hot-swap functionality across all valid VDD combinations, as confirmed in the Electrical Characteristics table under "POWER SUPPLY" and "DYNAMIC CHARACTERISTICS" sections.
ADUM1253ASA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for ADUM1253ASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM1253ASA+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 ADUM1253ASA+T reliable?
The price and inventory of ADUM1253ASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM1253ASA+T is usually 5 days.
3.What payment methods are accepted for ADUM1253ASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM1253ASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM1253ASA+T?
ADUM1253ASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM1253ASA+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 ADUM1253ASA+T?
For technical support, including ADUM1253ASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM1253ASA+T requirements.
6.How does Aetrix verify that ADUM1253ASA+T is sourced from the original manufacturer or authorized distributors?
All ADUM1253ASA+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 ADUM1253ASA+T meets industry standards.
7.What is the process for return or replacement of ADUM1253ASA+T?
All ADUM1253ASA+T units undergo pre-shipment inspection (PSI). If there is an issue with ADUM1253ASA+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 ADUM1253ASA+T part is unused and in its original packaging.
Return procedure for ADUM1253ASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM1253ASA+T Tags
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SI8710AC-B-ISR
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ISO7741FDWR
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