ISL33002IUZ - I2C Bus Buffer 2-Channel Hot-Swap | Renesas
MPN: ISL33002IUZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.2 | $1.20 |
| 10 | $1.05 | $10.50 |
| 100 | $0.85 | $85.00 |
| 500 | $0.65 | $325.00 |
| 1,000 | $0.45 | $450.00 |
ISL33002IUZ Overview
An I2C bus buffer (also called an I2C repeater, bus accelerator, or signal buffer) is an interface IC inserted in series with the SDA and SCL lines of a two-wire serial bus. The I2C specification limits direct bus capacitance to 400 pF; beyond this, rise times become too slow for reliable communication. A bus buffer segments the bus, isolating capacitance on either side and allowing the total system to far exceed the 400 pF limit while keeping the bidirectional, open-drain, clock-stretching behavior intact.
Key features of the ISL33002 include two buffered channels (SDA and SCL), rise-time accelerator circuitry that reduces the pull-up power consumption of passive resistors and improves achievable data rate, and integrated hot-swap circuitry that prevents bus corruption when a card or module is inserted or removed while the backplane is powered. The device is I2C and SMBus compatible and supports clock stretching and multi-master bus arbitration on both SDA and SCL, according to the Renesas ISL33001/ISL33002/ISL33003 datasheet.
Architecturally, the ISL33002 uses level-sensitive bidirectional buffer stages on each channel with current-limited accelerator pull-up events, so the buffer drives rise edges faster than large resistive pull-ups can, without fighting open-drain low-level assertions. This preserves true open-drain signaling while cutting RC time constants on heavily loaded segments.
Typical applications include backplane I2C fan-out in servers and telecom shelves, hot-swappable line cards and caddies, long cable I2C links between enclosures, and power-management (PMBus/SMBus) networks in industrial systems. The industrial -40C to +85C rating of the IUZ suffix suits uncooled factory environments.
A key design consideration: the hot-swap function needs the BIAS/EN pin properly connected to the local supply and the correct external pull-up values to avoid lockup during power sequencing.
This page synthesizes distributor pricing, stock status, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ISL33002IUZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ISL33002IUZ (same form factor and footprint) — differing in Function, Packaging, Package, Channels, Number of Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL33003IUZ
✅ Drop-In📋 Reference alternative (not in catalog)
ISL33001IUZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.43 / Unit
View Datasheet →ISL33002IUZ Specifications
| Function | I2C Bus Buffer / Repeater with Rise-Time Accelerator |
| Number of Channels | 2 |
| Channels Buffered | SDA and SCL |
| Supply Voltage | 2.5 V / 3.3 V / 5 V |
| Protocol Compatibility | I2C, SMBus |
| Hot-Swap Capability | Yes |
| Rise-Time Accelerator | Yes |
| Max Bus Capacitance Extension | Beyond 400 pF I2C limit |
| Clock Stretching Support | Yes |
| Multi-Master Arbitration Support | Yes |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Package | 8-MSOP |
| Mounting Type | Surface Mount |
| Packaging | Tube |
| RoHS Status | Pb-free w/ anneal (RoHS compliant) |
ISL33002IUZ 8-msop Pin Configuration Guide
Pin configuration for ISL33002IUZ (8-msop package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for ISL33002IUZ.
Refer to the datasheet for full pin configuration.
Typical Applications
ISL33002IUZ is suitable for 6 applications: Server and Telecom Backplane I2C, Hot-Swappable Line Cards and Storage Caddies, Industrial PMBus and SMBus Power-Management Networks, Long-Cable I2C Links Between Enclosures, Optical Module and Sensor Cluster Fan-Out, Battery Pack and BMS Monitoring Buses.
Server and Telecom Backplane I2C
Server shelves and telecom racks aggregate dozens of power-supply, fan, and FRU EEPROM devices on shared I2C/PMBus segments, easily exceeding the 400 pF capacitance limit defined by the I2C specification. The ISL33002IUZ buffers both SDA and SCL, segmenting capacitance so each stub stays under the limit, while its rise-time accelerators actively pull up edges faster than large passive resistors, improving clock and data margins at 100 kHz and 400 kHz. Place one buffer at the shelf controller and one at each far-end segment; the hot-swap circuitry also protects the live backplane during blade insertion. Confirm the buffer's supply (3.3V typical) and verify the open-drain timing budget across all segments during design review.
Recommended
Hot-Swappable Line Cards and Storage Caddies
Hot-pluggable FRUs - storage caddies, SFP-style modules, power-entry cards - connect to a powered I2C backplane where contact bounce can generate false start/stop conditions and corrupt in-flight transactions. The ISL33002IUZ's hot-swap circuitry holds the card-side SDA and SCL pins in a safe state during power-up transients, preventing glitches from reaching the live bus, per the Renesas datasheet. Its two-channel architecture covers both bus lines in a single 8-MSOP, saving board area versus discrete protection. Operating from the card's 2.5V, 3.3V, or 5V rail makes BOM reuse easy across product tiers. Verify that the local supply rises before or with the bus-side pins to guarantee the hot-swap hold-off window is fully effective during insertion events.
Recommended
Industrial PMBus and SMBus Power-Management Networks
Industrial power systems use SMBus/PMBus trees spanning power modules, digital POL converters, and temperature sensors distributed across an enclosure. Long harness runs push bus capacitance well beyond 400 pF and expose the bus to ground potential differences between racks. The ISL33002IUZ, with its -40C to +85C industrial rating, buffers each long run and its accelerator circuitry restores fast, symmetrical rise edges, according to the Renesas datasheet. Support for clock stretching and multi-master arbitration means PMBus hosts and alerted slaves can share the bus without protocol conflict. Use a buffer at each cabinet-to-cabinet boundary and keep pull-up resistors on both sides of the buffer sized per the datasheet equations for the accelerator threshold.
Recommended
Long-Cable I2C Links Between Enclosures
Connecting controllers to remote sensors, displays, or battery packs over one to several meters of cable is a classic I2C failure case: cable capacitance plus connector and ESD capacitance slows edges until arbitration and clock stretching fail intermittently. The ISL33002IUZ buffers SDA and SCL at the cable boundary so each side drives only its own segment, and the rise-time accelerators supply the strong pull-up that 2-5 meter cables need, extending operation beyond the 400 pF I2C specification limit, per the Renesas datasheet. Its 8-MSOP package fits at either cable end. Keep cable shielding and proper grounding, and add ESD protection rated for the cable environment, since the buffer itself does not replace surge protection.
Recommended
Optical Module and Sensor Cluster Fan-Out
Line cards carrying multiple optical transceivers or dense sensor clusters hang 8 to 16 I2C addresses off one controller, with each module's internal trace and connector adding capacitance. The ISL33002IUZ isolates the module bay stubs from the controller segment: the controller side sees only the buffer, while the accelerator actively shapes edges on the bays side, keeping eye margins healthy at 400 kHz. Two channels in one 8-MSOP cover SDA and SCL without extra components, and the -40C to +85C industrial range suits outdoor and uncooled equipment. Per the Renesas datasheet, clock stretching and arbitration pass through transparently, so module firmware updates and multi-master diagnostics continue to work. Distribute buffers so no bay exceeds the datasheet's per-segment capacitance guidance.
Recommended
Battery Pack and BMS Monitoring Buses
Battery management systems daisy-chain cell-monitoring and fuel-gauge devices across a pack, where wiring harness capacitance and connector contact resistance degrade I2C margins, and packs are frequently hot-connected to chargers or host equipment. The ISL33002IUZ addresses both problems: its two buffered channels extend the bus beyond the 400 pF I2C limit, and its hot-swap circuitry prevents bus corruption during pack insertion, per the Renesas datasheet. Operating from 2.5V, 3.3V, or 5V lets it sit on the pack's gauge rail or the host's logic rail, and the -40C to +85C range covers automotive-adjacent and industrial battery environments. Size pull-ups on the host side per the accelerator equations and verify behavior during pack pre-charge sequencing in system test.
Recommended
Recommended Products Summary
Engineering reference data for ISL33002IUZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL33003IUZ | ISL33001IUZ |
|---|---|---|---|
| Package | 8-MSOP | 8-MSOP - same | 8-MSOP - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics (Intersil legacy) |
| Number of Channels | 2 | 2 | 2 |
| Supply Voltage Options | 2.5 V / 3.3 V / 5 V | 2.5 V / 3.3 V / 5 V | 2.5 V / 3.3 V / 5 V |
| Hot-Swap Capability | Yes | Yes | Yes |
| Rise-Time Accelerator | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C (IUZ suffix) | -40C to +85C (IUZ suffix) |
Key Differentiators
- Hot-swap protection integrated on both channels (vs ISL33003IUZ)
- Rise-time accelerators cut pull-up power (vs Passive pull-up approach)
- Single 8-MSOP for both SDA and SCL (vs Discrete buffer solutions)
Design Notes
The most common ISL33002 design error is miswiring the enable/BIAS pin. The hot-swap and accelerator functions require the bias reference to be tied correctly to the local supply; leaving it floating or tying it to the wrong rail causes the buffer to hold the bus low or fail to assert accelerators. Because the ISL33003 family substitute differs in this pin's configuration detail, always re-check the pin configuration section of the Renesas ISL33001/ISL33002/ISL33003 datasheet against your schematic before any family-member substitution.
Place the ISL33002IUZ as close as possible to the cable or connector entry point it is protecting, so the capacitance of the unprotected stub before the buffer stays minimal. Route SDA and SCL as a short matched pair with a solid ground return, and keep the input and output side traces physically separated on the PCB to avoid capacitive coupling that would partially re-couple the two bus segments the buffer is meant to isolate. Provide bulk and 0.1 uF ceramic decoupling directly at the VCC pin.
Size pull-up resistors on both sides of the buffer using the datasheet equations for the accelerator threshold rather than copying standard 4.7 kOhm I2C values: the accelerator current limit interacts with pull-up strength, and too-strong pull-ups waste the power savings the accelerator circuitry provides while too-weak values extend fall-dependent timing. Estimated: at 3.3 V with 10 kOhm pull-ups on a heavily loaded segment, resistor current is only about 0.33 mA per line at low level, which is exactly the consumption class the accelerator is designed to reduce versus 1 kOhm pull-ups.
Compliance Information
Mouser listing states Pb-free w/ anneal; FindIC lists HTS code 8542390000. Full REACH, halogen-free, and conflict-minerals declarations must be obtained from the Renesas product page.
