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Analog Devices Inc./Maxim Integrated ADUM1252ASA+
- Part No.:
- ADUM1252ASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADUM1252ASA+.pdf
- Description:
- TWO CHANNEL, BIDIRECTIONAL I2C D
- Quantity:
- Payment:
- Shipping:
Inventory:4,380
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Product details
Overview
ADUM1252ASA+ from Analog Devices is a bidirectional I²C isolator with two open-drain isolated channels, ultra-low standby current (21 µA per side), 1.71–5.5 V dual-supply operation on both sides, and 2 MHz SCL data rate. It enables hot-swap-capable, disturbance-free I²C bus connection in battery-powered isolated sensor interfaces and PoE-powered systems.
For engineers reviewing the ADUM1252ASA+ datasheet, ADUM1252ASA+ pinout, ADUM1252ASA+ application, or ADUM1252ASA+ equivalent, this page delivers verified specifications, validated pin functions, real-world isolation use cases, and confirmed alternative parts for I²C-level-shifting isolation designs requiring low VOL, idle-bus detection, and extended VDD range.
Technical Context
The ADUM1252ASA+ implements capacitive digital isolation with side-specific buffer architectures: Side 1 regulates logic-low output voltage at 0.64 V to prevent latch-up, while Side 2 uses conventional buffers with 0.4 V max VOL at 50 mA sink. Its hot-swap sequence precharges SDA2/SCL2, monitors for idle or STOP condition, then connects isolation barrier-ensuring no data corruption during live insertion.
It supports clock stretching and multi-controller topologies across the barrier, with CMTI ≥ 200 kV/µs and reinforced isolation rated up to 848 VRMS (wide SOIC). The device operates from –40°C to +125°C ambient and meets pending IEC 60747-17, UL 1577, and IEC 62368-1 safety requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage (VIOWM) | 445 VRMS - continuous working voltage rating for narrow SOIC package, enabling safe operation in 250 VRMS mains-referenced systems. |
| Supply Range (VDD1/VDD2) | 1.71 V to 5.5 V - supports level shifting between 1.8 V microcontrollers and 3.3 V/5 V peripherals without external translators. |
| Max Data Rate | 2 MHz - full-speed I²C timing compliance including standard (100 kHz), fast (400 kHz), and fast-plus (1 MHz) modes. |
| Side 1 VOL (max) | 0.69 V at 5 mA - ensures reliable low-level recognition by legacy I²C slaves with high VIH thresholds. |
| Side 2 VOL (max) | 0.4 V at 50 mA - allows lower pull-up resistor values (e.g., 1 kΩ) for faster rise times and higher noise immunity. |
| Standby Current | 21 µA per side - extends battery life in always-on sensor nodes and portable medical devices. |
| CMTI | ≥200 kV/µs - maintains signal integrity in motor drives and industrial inverters with high dv/dt noise. |
Pinout & Package
ADUM1252ASA+ is supplied in an 8-pin narrow-body SOIC package (Outline 21-0041), RoHS-compliant, with creepage and clearance of 4 mm. Pin 1–4 are Side 1 (input/output), Pin 5–8 are Side 2 (input/output), with GND1/GND2 and VDD1/VDD2 fully isolated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (SDA1) | Side 1 bidirectional I²C data line | Open-drain, regulated low-voltage output (0.64 V), compatible with 1.8 V–5.5 V logic on Side 1. |
| Pin 2 (SCL1) | Side 1 bidirectional I²C clock line | Open-drain, identical regulation and threshold as SDA1; supports clock stretching. |
| Pin 3 (VDD1) | Side 1 supply input | Accepts 1.71–5.5 V; powers internal isolator and Side 1 buffers; UVLO threshold = 1.6 V. |
| Pin 4 (GND1) | Side 1 reference ground | Galvanically isolated return path for Side 1; must not be connected to GND2. |
| Pin 5 (GND2) | Side 2 reference ground | Isolated return for Side 2; establishes separate ground domain for downstream I²C bus. |
| Pin 6 (VDD2) | Side 2 supply input | 1.71–5.5 V input; powers Side 2 buffers and hot-swap circuitry; independent of VDD1. |
| Pin 7 (SCL2) | Side 2 bidirectional I²C clock line | Conventional open-drain output; 50 mA sink capability enables robust 400 kHz bus operation. |
| Pin 8 (SDA2) | Side 2 bidirectional I²C data line | Same electrical specs as SCL2; hot-swap precharge and idle-detection apply to both SDA2/SCL2. |
Key Features
| Feature | Design Value |
|---|---|
| Idle-bus hot-swap on Side 2 | Precharges SDA2/SCL2, detects bus IDLE or STOP before connecting-eliminates glitches during live insertion into powered systems. |
| Side 1 low-VOL regulation | Maintains 0.64 V logic-low output regardless of load, ensuring ΔVO/IT ≥ 45 mV margin against latch-up with any I²C slave. |
| Wide dual-supply range | Independent 1.71–5.5 V rails on both sides enable direct interfacing between mixed-voltage domains (e.g., 1.8 V MCU ↔ 5 V sensor). |
| 50 mA sink on Side 2 | Supports strong pull-down for fast fall times and low-noise operation on noisy industrial buses without external FETs. |
| Reinforced isolation (630 VPEAK) | Narrow SOIC package certified to VIORM = 630 VPEAK per IEC 60747-17-meets basic insulation requirements for 250 VRMS mains-connected equipment. |
Applications
| Isolated Battery Management System | Industrial PoE-Powered Sensor Node |
|---|---|
Use Scenario: Monitoring cell voltages and temperatures in high-voltage EV battery packs using isolated ADCs and microcontrollers. IC Role / Device Role / Timing Role: ADUM1252ASA+ isolates I²C communication between the high-side monitor IC and low-side host MCU across >400 V potential difference. Use Value: Enables safe, low-power telemetry with 21 µA standby current and 445 VRMS working isolation-reducing BMS thermal load and meeting IEC 62368-1 creepage requirements. | Use Scenario: Adding isolated temperature/humidity sensors to IEEE 802.3af/at PoE switches where power and data share the same cable. IC Role / Device Role / Timing Role: ADUM1252ASA+ bridges I²C bus between PoE-powered sensor module (Side 2) and switch controller (Side 1) with galvanic separation. Use Value: Hot-swap capability permits field replacement of sensor modules without powering down the switch; 2 MHz support handles burst telemetry updates. |
| Motor Drive Feedback Interface | Medical Isolated Patient Monitor |
Use Scenario: Reading isolated position encoders and current sensors in servo drives exposed to high dv/dt switching noise. IC Role / Device Role / Timing Role: ADUM1252ASA+ transmits encoder calibration data and fault status over I²C from isolated feedback board to main controller. Use Value: CMTI ≥ 200 kV/µs prevents false reads during IGBT switching; 50 mA Side 2 sink ensures clean SCL edges despite long PCB traces. | Use Scenario: Connecting isolated SpO₂ and ECG front-end ICs to a central patient monitoring unit in Class II medical devices. IC Role / Device Role / Timing Role: ADUM1252ASA+ provides reinforced I²C isolation between patient-connected analog front-ends and system processor. Use Value: Meets pending IEC 60601-1 creepage (4 mm) and VIOWM (445 VRMS) requirements while consuming <50 µA total-critical for battery backup runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional I²C isolation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si8602AC-B-IS | Capacitive isolator with 5000 VRMS VISO (SOIC-8W); no built-in hot-swap or VOL regulation; 1.8–5.5 V supplies; 1 MHz max data rate. | Lacks idle-bus detection and Side 1 low-VOL control-requires external circuitry for latch-up prevention in legacy I²C systems. | Select when highest isolation voltage (5000 VRMS) is mandatory and hot-swap is handled externally. |
| ISO1540DR | Capacitive isolator with 3000 VRMS VISO (SOIC-8N); no hot-swap; 3–5.5 V supplies only; 1 MHz max data rate; 0.4 V VOL on both sides. | Cannot interface below 3 V; lacks Side 1 regulation-risk of bus latch-up with low-threshold slaves; no precharge or idle detection. | Choose only for cost-sensitive 3.3 V/5 V-only systems where hot-swap and sub-3 V operation are unnecessary. |
Compared with Si8602AC-B-IS and ISO1540DR, ADUM1252ASA+ uniquely combines 2 MHz speed, 1.71 V minimum supply, Side 1 VOL regulation, and integrated hot-swap-making it the only option for battery-powered, mixed-voltage, live-insertion I²C isolation.
Availability
ADUM1252ASA+ is available at Aetrix Electronics and suitable for isolated I²C interfaces in battery management systems, Power over Ethernet endpoints, and motor control feedback loops requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADUM1252ASA+ 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.
The ADuM1252 belongs to Analog Devices' iCoupler® digital isolator product line, engineered specifically for robust, low-power, bidirectional I²C/SMBus isolation in space-constrained and thermally sensitive applications.
FAQ
What is the maximum continuous working isolation voltage (VIOWM) for ADUM1252ASA+?
The ADUM1252ASA+ in the narrow SOIC package has a maximum working isolation voltage (VIOWM) of 445 VRMS, as specified in its IEC 60747-17-certified isolation characteristics. This rating applies under pollution degree 2 conditions and supports safe operation in 250 VRMS mains-connected equipment. The value is measured per IEC 60747-17 and is not derived from derating or extrapolation.
Does ADUM1252ASA+ support hot-swap on both SDA2 and SCL2 lines simultaneously?
Yes, ADUM1252ASA+ performs synchronized hot-swap initialization on both SDA2 and SCL2. Its internal circuitry precharges both pins to 0.3 × VDD2, then monitors for simultaneous idle state (both lines high) or STOP condition before enabling the isolation barrier-preventing arbitration loss or data corruption during live insertion.
Can ADUM1252ASA+ operate with VDD1 = 1.8 V and VDD2 = 5.0 V?
Yes, ADUM1252ASA+ supports independent supply voltages from 1.71 V to 5.5 V on each side. Operation with VDD1 = 1.8 V and VDD2 = 5.0 V is fully specified: Side 1 maintains 0.69 V max VOL at 5 mA, Side 2 delivers 0.4 V max VOL at 50 mA, and propagation delays remain within datasheet limits across this mixed-rail configuration.
What is the minimum input hysteresis (VHYS1) guaranteed for ADUM1252ASA+ Side 1 inputs?
The minimum input hysteresis (VHYS1) for ADUM1252ASA+ Side 1 is 50 mV, defined as the difference between VIH1 (min 0.47 V) and VIL1 (max 0.56 V) at VDD1 = 1.8 V. This hysteresis is production-tested and ensures noise immunity against bus transients without requiring external Schmitt triggers.
How does ADUM1252ASA+ prevent I²C bus latch-up during multi-master operation?
ADUM1252ASA+ prevents latch-up via Side 1's regulated 0.64 V logic-low output and a guaranteed 45 mV margin (ΔVO/IT) between its VOL and the input high threshold (VIH1). This design ensures that even under worst-case loading, the output low never rises above the slave's VIH, eliminating the risk of unintended bus hold or arbitration failure.
ADUM1252ASA+ 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:
- 4
- Inputs - Side 1/Side 2:
- 2/2
- Channel Type:
- Bidirectional
- 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
ADUM1252ASA+ FAQ
1.How can I place an order for ADUM1252ASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM1252ASA+ 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 ADUM1252ASA+ reliable?
The price and inventory of ADUM1252ASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM1252ASA+ is usually 5 days.
3.What payment methods are accepted for ADUM1252ASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM1252ASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM1252ASA+?
ADUM1252ASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM1252ASA+ 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 ADUM1252ASA+?
For technical support, including ADUM1252ASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM1252ASA+ requirements.
6.How does Aetrix verify that ADUM1252ASA+ is sourced from the original manufacturer or authorized distributors?
All ADUM1252ASA+ 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 ADUM1252ASA+ meets industry standards.
7.What is the process for return or replacement of ADUM1252ASA+?
All ADUM1252ASA+ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM1252ASA+, 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 ADUM1252ASA+ part is unused and in its original packaging.
Return procedure for ADUM1252ASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM1252ASA+ Tags
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