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Analog Devices ADUM121N1BRZ — Digital Isolators
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Analog Devices / Digital Isolators

ADUM121N1BRZ Digital Isolator, 150Mbps, 3000Vrms, 8-SOIC

MPN ADUM121N1BRZ
End of Life Spot Stock · 24-48h Dispatch 100% Original Sealed

Analog Devices ADUM121N1BRZ iCoupler, 2-channel general-purpose digital isolator, 150Mbps, 3000Vrms isolation, 75kV/µs CMTI, 1.7V-5.5V supply, -40°C to 125°C, 8-SOIC.

In Stock: 22,720 pcs
MOQ: 1 pcs
Logistics: DHL / FedEx DAP (Global Express · 3-7d) Russia & CIS DDP (Door-to-Door Cleared)
Dispatch: Shenzhen / HK
Unit Price (USD)
$2.68 / pc
Direct Purchase Ready
Volume Pricing Breaks Confirmed upon quotation
1+ pcs
$2.68
10+ pcs
$2.41
30+ pcs
$2.20
100+ pcs
$1.98
500+ pcs
$1.85
1,000+ pcs
$1.74
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22,720 in stock — maximum per order · 3–4 days lead time

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100% Original Sealed 45x Microscope QC 30-Day Warranty · COC USD T/T & PI · DAP/DDP
[SPEC] Essential Parameters Snapshot Full Specifications (18)
Package / Case 8-SOIC (0.154", 3.90mm Width)
Supply Voltage 1.7V ~ 5.5V
ALT
Facing long factory lead times or allocation on ADUM121N1BRZ? Verified pin-compatible alternatives available with active Shenzhen stock and 100% solder-ready footprint match.
View Pin Alternates (3)

Full Technical Specifications

18 Parameters
ADUM121N1BRZ specifications
Parameter / AttributeSpecification / Value
TypeGeneral Purpose
SeriesiCoupler®
Channel typeUnidirectional
MountingSurface Mount
Supply voltage1.7V ~ 5.5V
Voltage - isolation3000Vrms
Isolated powerNo
Operating temperature-40°C ~ 125°C
Pulse width distortion3ns
PackageTube
Data rate150Mbps
TechnologyMagnetic Coupling
Case8-SOIC (0.154\", 3.90mm Width)
Channels2
Inputs - side 1/Side 21/1
Rise (Fall time)2.5ns, 2.5ns
Propagation delay tpLH (tpHL)13ns, 13ns
Common mode transient immunity75kV/µs
100% Footprint Match · Solder-Ready (No PCB Redesign Needed)

Need Stock or a Drop-in Second-Source for ADUM121N1BRZ?

Package: SOIC-8 (narrow body) · Pin-compatible replacements with immediate Shenzhen spot stock

Footprint Match 98%
Supply Chain & Allocation Reality:

The ADuM120x pair is the digital isolator that replaced optocouplers across industrial designs: two channels on a magnetic barrier instead of an LED, 2.5kV of isolation in an eight-pin SOIC, supplies from 2.7V to 5.5V that made 3.3V-to-5V level translation and isolation one component. The naming is a single decision - ADuM1200 carries both channels in one direction, ADuM1201 is the 1/1 bidirectional part - and the generation upgrade is documented pin-for-pin: the N-family maps onto the classic sockets with faster rates and fail-safe output options. The substitution mistake in this family is one character wide and completely fatal to the signal path.

Verified Pin-Compatible Replacements (3 verified alternatives)

ADuM1200 Analog Devices SOIC-8
Pin-to-Pin (Minor Clock/Init Tuning)
Availability & Target Pricing:

The 2/0 Member - Same Socket, Different Direction

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The same dual-channel isolator with both channels pointing the same way (2/0 against the 1201s 1/1 direction split): identical timing, identical supplies, opposite topology.

2.7V to 5.5V on either side with independent level translation; 2.5kV RMS isolation.

Compatibility & Drop-In Notes: The substitution rule: same socket, same speed grades (A/B/C at 1/10/25Mbps), same everything except the arrows. A 1200 in a 1201 socket isolates half the bus and inverts the other halfs role - the failure looks like a protocol bug, not a component mistake.
Package & Solder Footprint: Identical SOIC-8 footprint.
Shenzhen Warehouse Stock & MOQ: Stocked as the pair; label the two drawers distinctly.
Request Volume Quote for ADuM1200 Compare ADUM121N1BRZ vs ADuM1200 Spec Matrix
ADuM121N1 Analog Devices SOIC-8
Pin-to-Pin (Minor Clock/Init Tuning)
Availability & Target Pricing:

The Pin-Compatible Modern Generation

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The N-generation replacement documented as pin-compatible with the ADuM1201 (the ADuM120N1 maps to the ADuM1200): up to 150Mbps, lower propagation delay, 100kV/us common-mode transient immunity and selectable fail-safe output (N0 against N1).

1.8V to 5V supplies; 3kV RMS isolation class.

Compatibility & Drop-In Notes: The upgrade direction is calm: pin-compatible into the classic sockets with better performance. The one review: which fail-safe behavior the design assumed during power sequencing - check the N0/N1 suffix against the board behavior before standardizing.
Package & Solder Footprint: Same SOIC-8 land pattern.
Shenzhen Warehouse Stock & MOQ: Active production; the forward buy for the socket.
Request Volume Quote for ADuM121N1 Compare ADUM121N1BRZ vs ADuM121N1 Spec Matrix
ADuM1285 Analog Devices SOIC-8
Pin-to-Pin (Minor Clock/Init Tuning)
Availability & Target Pricing:

The Direction-Swapped N Option

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The N-generation mapping option for same-direction duty (the N0 variants map onto the 1285/1286) with fail-safe-high output behavior.

Modern low-voltage envelope; same isolation class.

Compatibility & Drop-In Notes: In repair, the pattern to keep: the N family is a small matrix of direction x data-rate x fail-safe - three coordinates, all encoded in the suffix. Any substitution ends by checking the coordinate, not the family name.
Package & Solder Footprint: SOIC-8 shared land pattern.
Shenzhen Warehouse Stock & MOQ: Stocked with the N row; documented ordering table.
Request Volume Quote for ADuM1285 Compare ADUM121N1BRZ vs ADuM1285 Spec Matrix
Buyer & Quality Checklist for Sourcing Alternatives
  • The channel map is the part number: ADuM1200 is 2/0 (both channels one direction), ADuM1201 is 1/1 - the bidirectional dual. The bodies are identical; the digit is the entire topology.
  • Grades A/B/C set data rate (about 1/10/25 Mbps): the slow grade in a fast socket works until the bus speed is actually used - in repair, match the grade letter when the original design ran near its limit.
  • The N-generation is documented pin-compatible onto the classic row (120N1 onto 1200, 121N1 onto 1201) with far higher rates and selectable fail-safe outputs - the upgrade path is real, and the fail-safe suffix is the new thing to read.
  • Independent supplies on the two sides are the feature: 3.3V logic on one side, 5V on the other, each at its own level. The isolation barrier is also the level translator - do not add level shifters by reflex when repairing.
  • Isolation grade differences live in the body variants (wide-body and higher-kV members): the 8-pin narrow package is one class - substituting across bodies is a creepage decision, not a pin decision.
  • In field failures, check both supplies before the part: a dead isolator side that lost its rail reads exactly like a dead isolator. The part is usually the messenger in a power-sequencing story.
Frequently Asked Technical Questions

Q: What is the difference between ADuM1200 and ADuM1201?

A: Channel direction only: ADuM1200 routes both channels the same way (2/0), ADuM1201 provides one channel each direction (1/1). Identical package, supplies and timing - the one-digit rule decides whether a bus crosses the barrier both ways.

Q: Can the N-generation replace the classic ADuM120x?

A: Pin-compatible per the documented mapping (ADuM120N1 onto ADuM1200, ADuM121N1 onto ADuM1201) with higher speed, lower delay and selectable fail-safe output - verify the N0/N1 fail-safe suffix against the power-up behavior the board expects.

Q: Do I need level shifting around a digital isolator?

A: No - the two sides carry independent 2.7-5.5V supplies (1.8-5V on the N row), so the isolator is also the translator. Repair habits from optocoupler circuits that add shifters waste parts and add failure points.

Technical Details & Description

Two-channel digital isolator for noisy industrial links

The ADUM121N1BRZ is a two-channel, unidirectional digital isolator from the iCoupler family, using magnetic coupling. It delivers 150Mbps across a 3000Vrms barrier, with 13ns propagation delay and 3ns pulse-width distortion.

75kV/µs CMTI — the spec that keeps data clean in a motor drive

That is the number to watch when the isolator sits between a microcontroller and a gate-driver on a 48V or 400V inverter bus — fast switching edges couple common-mode noise across the barrier, and if the CMTI is too low, the output glitches. 75kV/µs handles the dV/dt from SiC and GaN stages comfortably. Rise and fall times are 2.5ns typical, so the output edges stay sharp enough for 150Mbps NRZ data without excessive ringing.

Frequently asked questions

Can ADUM121N1BRZ be used for SPI isolation?

Yes, the 150Mbps data rate and 13ns propagation delay are fast enough for SPI clocks up to 75 MHz (half-duplex) or 150 Mbps (full-duplex with two channels). The unidirectional channel configuration — one input on side 1, one input on side 2 — matches a typical SPI MOSI/MISO pair. For a three-wire SPI with chip select, you would need a third channel, which the three-channel ADUM131D0BRZ provides in the same package footprint.

What is the replacement for ADUM121N1BRZ?

There is no official replacement because the part is active and current. The tape-and-reel variant ADUM121N1BRZ-RL7 is functionally identical — same silicon, same ratings — just packaged in Tape & Reel instead of Tube.

ADUM121N1BRZ
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