Analog Devices Inc. ADUM3152BRSZ

Overview

ADUM3152BRSZ from Analog Devices is a 7-channel, 3.75 kV reinforced digital isolator optimized for SPI bus isolation. It integrates four high-speed channels (CLK, MO/SI, MI/SO, SS) supporting up to 17 MHz SPI clock rate with 14 ns propagation delay and 1 ns jitter, plus three unidirectional 250 kbps low-speed data channels (VIA/VIB/VIC → VOA/VOB/VOC), all in a 20-lead SSOP package rated for 125°C operation.

For engineers reviewing the ADUM3152BRSZ datasheet, ADUM3152BRSZ pinout, ADUM3152BRSZ application, or ADUM3152BRSZ equivalent, this device delivers precise timing-critical SPI isolation with high common-mode transient immunity (>25 kV/µs), UL/VDE-reinforced safety certification, and mixed-voltage (3.3 V/5 V) interoperability - critical for industrial PLC backplanes and isolated sensor interfaces.

Technical Context

The ADUM3152BRSZ implements iCoupler® chip-scale transformer isolation across seven independent channels: four dedicated to bidirectional SPI signal paths (MCLK, MSS, MO, SO) with glitch filtering on MSS, and three slow channels (VIA/VIB/VIC inputs mapped to VOA/VOB/VOC outputs) using asynchronous sampling at 250 kbps. Its B-grade timing performance guarantees ≤14 ns propagation delay on fast channels and ≤2.6 µs on slow channels under 5 V operation.

It supports asymmetric supply configurations (e.g., VDD1 = 5 V / VDD2 = 3.3 V), maintains VIORM = 565 V peak reinforced insulation per DIN EN IEC 60747-17 (VDE 0884-17), and achieves 5.3 mm creepage/clearance - enabling compliance with IEC/EN/CSA 62368-1 for basic and reinforced insulation systems in industrial environments.

Key Specifications

Pinout & Package

ADUM3152BRSZ uses a 20-lead SSOP package (5.1 mm creepage) with exposed pad for thermal management. Pin functions are defined per Figure 2 of the Rev. C datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM3151BRSZ, ADUM3152BRSZ offers identical timing and isolation specs but reversed functional orientation for slave-side integration; versus SI8652BB-B-IS, it adds two low-speed channels and achieves higher safety certification - critical for industrial PLCs requiring dual-redundant status reporting and regulatory compliance.

Availability

ADUM3152BRSZ is available at Aetrix Electronics and suitable for industrial programmable logic controllers (PLCs), isolated sensor interfaces, and motor drive current feedback systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ADUM3152BRSZ 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 with precision signal chain solutions.

The ADuM315x family was designed specifically to solve timing-critical SPI isolation challenges in industrial automation, offering integrated high-speed and low-speed channels with reinforced safety certification - enabling compact, reliable, and standards-compliant isolated interfaces.

FAQ

What is the maximum SPI clock frequency supported by the ADUM3152BRSZ?

The ADUM3152BRSZ supports up to 17 MHz SPI clock rate under 5 V operation, with guaranteed timing performance including 14 ns typical propagation delay and ≤3 ns pulse width distortion. At 3.3 V operation, the maximum clock rate is 12.5 MHz, and in mixed-supply mode (5 V/3.3 V), it operates up to 15.6 MHz - all verified per Rev. C datasheet Table 1, Table 4, and Table 7.

Does the ADUM3152BRSZ support bidirectional communication on all seven channels?

No. The ADUM3152BRSZ provides four high-speed bidirectional SPI signal paths (MCLK/MSS/MO/SO ↔ SCLK/SSS/MI/SI) and three unidirectional low-speed channels (VIA/VIB/VIC → VOA/VOB/VOC). Channel directionality is fixed per the functional block diagram in Figure 2 of the ADUM3152BRSZ datasheet - no software or pin configuration alters this mapping.

What safety certifications does the ADUM3152BRSZ hold?

The ADUM3152BRSZ is certified to UL 1577 (3750 V rms, 1 minute), DIN EN IEC 60747-17 (VDE 0884-17) for reinforced insulation (VIORM = 565 V peak), and IEC/EN/CSA 62368-1. These approvals are documented in Tables 14 and 15 of the Rev. C datasheet and apply to the ADUM3152BRSZ device as shipped - no additional external components are required to meet these ratings.

Can the ADUM3152BRSZ operate with different supply voltages on each side?

Yes. The ADUM3152BRSZ supports mixed-voltage operation: VDD1 and VDD2 may be independently set to 3.3 V or 5 V (within 3.0–5.5 V range), enabling direct interfacing between 3.3 V microcontrollers and 5 V peripherals. Electrical characteristics for 5 V/3.3 V and 3.3 V/5 V modes are fully specified in Tables 7 and 10 of the Rev. C datasheet.

How many low-speed isolation channels does the ADUM3152BRSZ provide, and what is their data rate?

The ADUM3152BRSZ provides three dedicated low-speed isolation channels (VIA/VIB/VIC → VOA/VOB/VOC) operating at a fixed 250 kbps data rate. Each channel exhibits ≤2.6 µs propagation delay and ≤2.5 µs jitter, with minimum input skew requirements (≥3 ns) defined in Table 1 footnote 4 of the Rev. C datasheet to ensure correct edge sequencing.