MAX14933AWE+ - 2-Ch 2.75kVrms I2C Digital Isolator | ADI/Maxim
料号： MAX14933AWE+ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.29 | $6.29 |
| 10 | $5.66 | $56.60 |
| 100 | $5.03 | $503.00 |
| 500 | $4.41 | $2,205.00 |
| 1,000 | $3.78 | $3,780.00 |
MAX14933AWE+ 概述
A digital isolator is a semiconductor device that transmits logic-level signals across a galvanic isolation barrier (typically a high-voltage capacitor or transformer inside an IC package) while blocking DC and low-frequency AC between input and output. Digital isolators (and their ancestors, optocouplers) belong to the signal-isolation family, which also includes isolated gate drivers and isolated ADCs. Compared to optocouplers, CMOS digital isolators offer 10x faster data rates, 5-10x lower power consumption, tighter CMTI, and no LED-aging concerns. The MAX14933 family specifically targets I2C/SMBus, where both clock and data lines are bidirectional and open-drain, requiring unique bidirectional channel design.
Key features of the MAX14933AWE+ include 2.75kVrms isolation rating, two bidirectional open-drain channels suitable for SDA/SCL, 2 Mbps data rate, 3.0V to 5.5V supply range on both sides, 25 kV/us typical CMTI, and integrated hot-swap friendly architecture for cards that plug into a live backplane. The device replaces discrete optocoupler-plus-logic solutions with a single CMOS IC, simplifying PCB layout and reducing BOM count in isolated I2C designs.
The MAX14933 employs proprietary CMOS isolation technology that embeds the isolation barrier on-chip rather than relying on a separate transformer or LED. The two bidirectional channels each contain edge-detection and channel-reversal logic so that the open-drain I2C signal can flow from side-A to side-B and back without external direction-control circuitry. This architecture delivers the speed and CMTI of modern digital isolators while preserving the bidirectional open-drain behavior required by the I2C specification.
Typical applications include isolated I2C communication between microcontrollers and sensors in industrial automation, isolated SMBus interface to hot-swap-able power supplies, isolated EEPROM or temperature-sensor readouts in patient monitors, battery-management I2C buses in 400V/800V EV battery packs, and isolated GPIO expansion over I2C backplanes. The wide-body SOIC-16 (7.50mm) package provides the required 8mm creepage/clearance for 2.75kVrms reinforced isolation.
When designing with this part, allocate the wide-body SOIC-16 footprint carefully - the 7.50mm body width is required to meet the 2.75kVrms creepage and clearance, and substituting a narrow-body SOIC-16 will violate safety distances. Both sides need a local 3.0V-5.5V supply with a 0.1uF decoupling capacitor close to each VDD pin, and SDA/SCL pull-up resistors must be placed on the side that drives each line low.
This page combines distributor pricing, drop-in alternatives in the same SOIC-16 footprint, and practical design notes that supplement the manufacturer datasheet.
直接替换替代料： MAX14933AWE+ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MAX14933AWE+ （相同外形与封装尺寸） ——差异在于 Number of Channels, Package, RoHS Status, Data Rate, CMTI.
快速对比工具——选择替代料号进行并排对比：
MAX14933ASE+
✅ 直接替换📋 参考替代料（不在目录中）
MAX14937AWE+
✅ 直接替换📋 参考替代料（不在目录中）
ISO1640BDR
✅ 直接替换✓ 有现货
$2.05 / 个
查看数据手册 →ADUM1250ARZ
✅ 直接替换✓ 有现货
$1.85 / 个
查看数据手册 →ADUM2250ARWZ
✅ 直接替换✓ 有现货
$2.8 / 个
查看数据手册 →MAX14933AWE+ 规格参数
| 功能 | Two-channel bidirectional I2C digital isolator |
| Number of Channels | 2 (bidirectional, open-drain) |
| Isolation Voltage (RMS) | 2.75 kVrms |
| Common-Mode Transient Immunity (CMTI) | 25 kV/us (typical) |
| Maximum Data Rate | 2 Mbps |
| Supply Voltage (each side) | 3.0 V to 5.5 V |
| Channel Type | Bidirectional open-drain |
| 工作温度范围 | -40 C to +125 C |
| 封装 | 16-SOIC (0.295", 7.50mm wide-body) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
| Family Reference | For 5kVrms version, refer to MAX14937 |
MAX14933AWE+ 引脚配置
| 引脚 1 | VDD1 — Power supply, side 1 (3.0 V to 5.5 V) |
| 引脚 2 | GND1 — Ground reference, side 1 |
| 引脚 3 | SDA1 / SCL1 — Bidirectional I2C data/clock channel, side 1 |
| 引脚 4 | SCL1 / SDA1 — Bidirectional I2C clock/data channel, side 1 |
| 引脚 5 | NC — Not connected (per datasheet) |
| 引脚 6 | NC — Not connected (per datasheet) |
| 引脚 7 | NC — Not connected (per datasheet) |
| 引脚 8 | NC — Not connected (per datasheet) |
| 引脚 9 | NC — Not connected (per datasheet) |
| 引脚 10 | NC — Not connected (per datasheet) |
| 引脚 11 | SCL2 / SDA2 — Bidirectional I2C clock/data channel, side 2 |
| 引脚 12 | SDA2 / SCL2 — Bidirectional I2C data/clock channel, side 2 |
| 引脚 13 | NC — Not connected (per datasheet) |
| 引脚 14 | NC — Not connected (per datasheet) |
| 引脚 15 | GND2 — Ground reference, side 2 |
| 引脚 16 | VDD2 — Power supply, side 2 (3.0 V to 5.5 V) |
典型应用
MAX14933AWE+ 适用于 6 应用s: Isolated Industrial I2C Sensor Bus, Isolated SMBus Interface to Hot-Swap Power Supply, Isolated EV Battery-Management I2C Link, Isolated Medical Patient-Monitoring Sensor Readout, Isolated EEPROM / FRAM Configuration Readout, Isolated GPIO Expansion over I2C Backplane.
Isolated Industrial I2C Sensor Bus
The MAX14933AWE+'s 2.75 kVrms isolation and two bidirectional open-drain channels match the SDA/SCL pair of a typical industrial I2C sensor bus, allowing a PLC on the low-voltage logic side to read isolated 24V-side temperature, pressure, or flow sensors. Its 2 Mbps data rate exceeds Fast-mode Plus (1 Mbps) so even high-update-rate sensors are not bandwidth-limited, and 25 kV/us typical CMTI prevents corruption from adjacent motor-drive switching transients in the same panel.
推荐
Isolated SMBus Interface to Hot-Swap Power Supply
The MAX14933AWE+ isolates the SMBus lines between a baseboard management controller and a hot-swappable PSU or VRM, supporting PMBus telemetry of voltage, current, and temperature across the safety barrier. Its 3.0V-5.5V dual supply lets the BMC run at 3.3V while the PSU side runs at 5V without level shifters, and the 2.75 kVrms rating clears the creepage needed for 48V telecom or 54V data-center distribution rails.
推荐
Isolated EV Battery-Management I2C Link
Inside an EV battery pack, the MAX14933AWE+ isolates the I2C bus between the master BMS controller and individual cell-monitoring ASICs stacked at high common-mode voltage. Its 2.75 kVrms withstands 400V system transients, the 25 kV/us CMTI tolerates dV/dt events on adjacent gate drivers, and the wide-body SOIC-16 footprint provides the 8mm creepage required by automotive high-voltage PCB guidelines. Two bidirectional channels cover both SDA and SCL without direction-control glue logic.
推荐
Isolated Medical Patient-Monitoring Sensor Readout
In patient monitors and bedside diagnostic equipment, the MAX14933AWE+ provides 2.75 kVrms patient-isolation between the MCU-side data aggregator and the isolated sensor front-end (SpO2, temperature, ECG lead-sense). This barrier protects the patient from any fault current on the line-power side and meets IEC 60601-1 creepage requirements when laid out with appropriate PCB clearances. The 2 Mbps headroom supports real-time waveform digitization across the barrier.
推荐
Isolated EEPROM / FRAM Configuration Readout
The MAX14933AWE+ isolates an I2C EEPROM or FRAM that holds calibration constants or configuration data on a high-voltage or line-powered module. Galvanic isolation prevents ground loops and protects the host MCU from fault voltages on the field side, while the two bidirectional channels cleanly carry SCL and SDA without external circuitry. The wide-body SOIC package keeps the layout compatible with reinforced-insulation PCB rules.
推荐
Isolated GPIO Expansion over I2C Backplane
Using an I2C-to-GPIO expander on each side of the MAX14933AWE+, engineers can extend the host's I/O count across an isolation barrier with only the two bidirectional channels. The 2 Mbps data rate supports fast polling of GPIO state changes, and the 3.0V-5.5V dual-supply flexibility lets the expander logic run on either side's rail. This is widely used in programmable logic controllers and rack-mounted networking gear.
推荐
推荐产品汇总
工程参考数据： MAX14933AWE+ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MAX14933ASE+ | MAX14937AWE+ | ISO1640BDR | ADUM1250ARZ | ADUM2250ARWZ |
|---|---|---|---|---|---|---|
| Package | 16-SOIC wide-body (0.295") | 16-SOIC narrow-body (0.154") | 16-SOIC wide-body (0.295") | 16-SOIC wide-body (0.295") | 16-SOIC wide-body (0.295") | 16-SOIC wide-body (0.295") |
| Brand | Analog Devices (Maxim) | Analog Devices (Maxim) | Analog Devices (Maxim) | Texas Instruments | Analog Devices | Analog Devices |
| Isolation Voltage (RMS) | 2.75 kVrms | 2.75 kVrms | 5 kVrms | 2.5 kVrms | 2.5 kVrms | 5 kVrms |
| Maximum Data Rate | 2 Mbps | 2 Mbps | 2 Mbps | 1.7 Mbps | 3 Mbps | 1 Mbps |
| CMTI (typical) | 25 kV/us | 25 kV/us | 25 kV/us | 50 kV/us | 25 kV/us | 25 kV/us |
| Supply Voltage (each side) | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Number of Channels | 2 bidirectional | 2 bidirectional | 2 bidirectional | 2 bidirectional | 2 bidirectional | 2 bidirectional |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
关键差异点
- Higher isolation voltage than TI ISO1640 （对比 ISO1640BDR)
- Higher data rate than ADUM2250 （对比 ADUM2250ARWZ)
- Wide-body SOIC with full creepage vs narrow-body option （对比 MAX14933ASE+)
设计说明
Use the wide-body SOIC-16 footprint (7.50 mm body) to preserve the 8 mm minimum creepage and clearance required by 2.75 kVrms reinforced isolation. Substituting a narrow-body SOIC-16 footprint on the same land pattern will violate IEC 60747-17 safety distances and may fail agency testing. Add PCB-level slots or keep-out polygons under the part to widen the surface creepage path between side-1 and side-2 copper.
Place a 0.1 uF low-ESR ceramic decoupling capacitor within 2 mm of each VDD pin (VDD1 and VDD2), referenced to the matching GND. Each side of the isolator has its own power domain, so the decoupling caps must not share a return path; star-ground the GND1 and GND2 planes back to their respective supply sources to avoid high-frequency noise coupling across the barrier.
External pull-up resistors on SDA and SCL are required on both sides of the MAX14933AWE+ because the device provides bidirectional open-drain channels but does not include internal pull-ups. Choose pull-up values that satisfy the I2C rise-time spec given the bus capacitance on each isolated side - typically 4.7 kohm at 3.3V / 100 kHz and 2.2 kohm at 5V / 400 kHz - and ensure the pull-up voltage matches the side's VDD.
合规信息
RoHS and lead-free per ADI/Maxim product page. AEC-Q100 not specifically listed for this part; check ADI automotive-grade catalog for -A versions if needed. Halogen-free status not stated in the verified data.
