Analog Devices Inc. ADUM3150ARSZ

Overview

ADuM3150ARSZ from Analog Devices is a 3.75 kV reinforced isolation, 6-channel SPIsolator™ digital isolator optimized for isolated SPI interfaces with delay clock support. It provides four high-speed SPI signal channels (MCLK, MO/SI, MI/SO, MSS) and two independent 250 kbps bidirectional data channels (VIA/VIB), enabling robust isolation in industrial PLCs and sensor systems operating up to 125°C.

For engineers reviewing the ADuM3150ARSZ datasheet, ADuM3150ARSZ pinout, ADuM3150ARSZ application, or ADuM3150ARSZ equivalent, key selection factors include its 40 MHz delay-clock mode operation, 14 ns propagation delay on fast channels, 250 kbps slow-channel data rate, 25 kV/µs common-mode transient immunity, and 20-lead SSOP package with 5.1 mm creepage.

Technical Context

The ADuM3150ARSZ implements iCoupler® chip-scale transformer isolation across six independent channels: four dedicated to SPI bus signals (MCLK, MO/SI, MI/SO, MSS) and two low-speed bidirectional data paths (VIA/VIB). Its delay clock (DCLK) output enables 40 MHz SPI clock performance by compensating for propagation delays between master-side clock and subordinate-side sampling.

Fast channels operate with 14 ns typical propagation delay and 1 ns jitter at 17 MHz SPI clock rates; slow channels use internal asynchronous sampling for 250 kbps data transfer with 2.5 µs jitter. The device supports mixed-voltage operation (3.3 V/5 V or 5 V/3.3 V) and maintains >25 kV/µs common-mode transient immunity across its full −40°C to +125°C temperature range.

Key Specifications

Pinout & Package

ADuM3150ARSZ uses a 20-lead SSOP package with 0.65 mm lead pitch and 5.1 mm minimum creepage distance between input and output sides. Pin functions are asymmetrically distributed to separate primary (main side) and secondary (subordinate side) domains.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SPI isolation applications.

Compared with ADuM3150ARSZ, ADuM3151ARSZ offers identical functionality without delay clock support-reducing complexity where 40 MHz operation isn't needed-while ADuM4150ARWZ trades compact SSOP size for higher 5 kV isolation and greater creepage, making it suitable for more demanding safety certifications.

Availability

ADuM3150ARSZ is available at Aetrix Electronics and suitable for industrial programmable logic controllers (PLCs), sensor isolation interfaces, and motor drive current feedback systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ADuM3150ARSZ 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 ADuM3150ARSZ belongs to the SPIsolator™ family of digital isolators designed specifically for robust, timing-accurate isolation of serial peripheral interfaces in electrically noisy, high-reliability industrial environments.

FAQ

What is the maximum SPI clock frequency supported by the ADuM3150ARSZ?

The ADuM3150ARSZ supports up to 40 MHz SPI clock speed in delay clock mode using the DCLK output, and up to 17 MHz in standard 4-wire SPI mode. These values are confirmed in the datasheet's Features section and Table 2 switching specifications under 5 V operation. The 40 MHz capability relies on precise DCLK compensation and requires proper PCB layout to maintain signal integrity.

Does the ADuM3150ARSZ support mixed-voltage operation between its two sides?

Yes, the ADuM3150ARSZ supports mixed-voltage operation: VDD1 can be 3.3 V while VDD2 is 5 V, or vice versa. Electrical Characteristics tables (Tables 6 and 8) explicitly define performance for both 5 V/3.3 V and 3.3 V/5 V configurations, including SPI clock rates, propagation delays, and supply currents. This eliminates external level-shifting components in heterogeneous system designs.

How many isolation channels does the ADuM3150ARSZ provide, and what are their data rates?

The ADuM3150ARSZ provides six total isolation channels: four high-speed unidirectional SPI signal channels (MCLK, MO/SI, MI/SO, MSS) rated for up to 40 Mbps, and two bidirectional low-speed data channels (VIA/VIB ↔ VOA/VOB) operating at 250 kbps. This channel split is documented in the General Description and Table 2, with jitter and propagation delay specified separately for each group.

What safety certifications apply to the ADuM3150ARSZ?

The ADuM3150ARSZ holds UL 1577 (3750 V rms, 1 minute), DIN EN IEC 60747-17 (VDE 0884-17) reinforced insulation (565 V peak), and IEC/EN/CSA 62368-1 certifications. These are listed in the Regulatory Information section and Table 11. Its VIORM = 565 V peak and minimum creepage of 5.1 mm meet reinforced insulation requirements for industrial equipment up to 400 V rms mains.

Can the ADuM3150ARSZ operate at 125°C ambient temperature?

Yes, the ADuM3150ARSZ is fully specified for continuous operation from −40°C to +125°C ambient temperature, as stated in the Recommended Operating Conditions (Table 14) and Absolute Maximum Ratings (Table 15). Its high-temperature qualification is validated across all electrical parameters, including propagation delay stability and common-mode transient immunity, making it suitable for enclosed industrial enclosures and motor control environments.