MAX14851AEE+ - 6-Ch 600Vrms Digital Isolator, 2Mbps/50Mbps | Analog Devices
料号： MAX14851AEE+ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.62 | $4.62 |
| 10 | $4.1 | $41.00 |
| 100 | $3.55 | $355.00 |
| 500 | $3.1 | $1,550.00 |
| 1,000 | $2.8 | $2,800.00 |
MAX14851AEE+ 概述
A digital isolator is an integrated circuit that transfers logic signals between two voltage domains while maintaining galvanic isolation - a safety barrier that blocks DC and low-frequency AC while allowing high-frequency digital edges to pass. Isolators belong to the signal isolation family, which sits between interface ICs and power management in the broader semiconductor hierarchy. They are essential for breaking ground loops, protecting low-voltage logic from high-voltage transients, and meeting safety standards such as IEC 60747-17 / UL 1577 for reinforced insulation.
Key features of the MAX14851AEE+ include six unidirectional channels configurable as forward/reverse combinations, 11.8 ns typical propagation delay, 3V to 5.5V independent supply on each side (suitable as a level translator), 600Vrms working voltage per UL 1577, and an extended -40C to +125C operating temperature range. Independent supply ranges also make the device suitable as a logic-level translator between 3.3V and 5V systems without external circuitry.
The MAX14851 uses Maxim's proprietary monolithic isolation process, embedding the isolation barrier on the same silicon die rather than relying on transformer or optical coupling. This monolithic approach achieves lower power consumption and higher channel density than multi-chip alternatives while eliminating the discrete transformer or optocoupler BOM.
Typical applications include isolating SPI buses between an MCU and a sensor front-end, isolating I2C and RS-232/RS-485/RS-422 transceivers in industrial fieldbus nodes, general-purpose GPIO isolation in PLC and motor-drive digital interfaces, and level translation between mixed-voltage MCUs and 5V peripherals. Six channels are well matched to 4-wire SPI plus chip-select and one extra GPIO for fault or reset signaling.
When designing with the MAX14851AEE+, route the four inner ground pins (GND1/GND2) carefully to maintain barrier creepage and clearance. Place 0.1 uF + 10 uF decoupling on both VDDA and VDDB as close to the IC as possible. Avoid running high-speed traces under the device to preserve creepage on the SSOP body.
This page synthesizes distributor pricing, drop-in alternatives, and design notes that are not consolidated in the manufacturer datasheet, including a side-by-side comparison with same-package isolators.
直接替换替代料： MAX14851AEE+ ——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： MAX14851AEE+ （相同外形与封装尺寸） ——差异在于 Package, Common-Mode Transient Immunity (CMTI), Operating Temperature Range, Number of Channels, MSL Level.
快速对比工具——选择替代料号进行并排对比：
MAX14851AEE+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX14850ASE+
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.41 / 个
查看数据手册 →MAX14821ETG+
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$4.65 / 个
查看数据手册 →ISO7762FDWR
✅ 直接替换✓ 有现货
$2.74 / 个
查看数据手册 →ISO7761DW
✅ 直接替换✓ 有现货
$2.78 / 个
查看数据手册 →ISO7763FDWR
✅ 直接替换✓ 有现货
$2.5 / 个
查看数据手册 →MAX14851AEE+ 规格参数
| Product Type | Six-Channel Digital Isolator |
| Number of Channels | 6 |
| Channel Direction | Unidirectional (configurable forward/reverse) |
| Isolation Voltage (rms) | 600 Vrms |
| Maximum Data Rate | 50 Mbps (2 Mbps default per channel) |
| Common-Mode Transient Immunity (CMTI) | 3.2 kV/us (minimum) |
| Propagation Delay (typical) | 11.8 ns |
| Supply Voltage (each side) | 3 V to 5.5 V (independent) |
| Supply Type | Independent dual supply |
| Working Voltage | 600 Vrms (per UL 1577) |
| 工作温度 | -40 C to +125 C |
| 封装 | 16-pin SSOP / QSOP (0.154" / 3.90 mm width) |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 |
| RoHS 状态 | Compliant |
| Safety / Isolation Standard | UL 1577, IEC 60747-17 |
| Process Technology | Maxim monolithic proprietary isolation |
MAX14851AEE+ 引脚配置
| 引脚 1 | VDDA — Supply voltage for side A (3V to 5.5V) |
| 引脚 2 | GND1 — Ground reference 1 (inner) |
| 引脚 3 | INA1 — Input channel A1 (side A) |
| 引脚 4 | INA2 — Input channel A2 (side A) |
| 引脚 5 | INA3 — Input channel A3 (side A) |
| 引脚 6 | GND1 — Ground reference 1 (inner) |
| 引脚 7 | INA4 — Input channel A4 (side A) |
| 引脚 8 | INA5 — Input channel A5 (side A) |
| 引脚 9 | GND2 — Ground reference 2 (inner) |
| 引脚 10 | OUTB1 — Output channel B1 (side B) |
| 引脚 11 | OUTB2 — Output channel B2 (side B) |
| 引脚 12 | GND2 — Ground reference 2 (inner) |
| 引脚 13 | OUTB3 — Output channel B3 (side B) |
| 引脚 14 | OUTB4 — Output channel B4 (side B) |
| 引脚 15 | OUTB5 — Output channel B5 (side B) |
| 引脚 16 | VDDB — Supply voltage for side B (3V to 5.5V) |
典型应用
MAX14851AEE+ 适用于 6 应用s: SPI Bus Isolation in Industrial PLCs, RS-485 / RS-422 Fieldbus Isolation, I2C Bus Level Translation and Isolation, Motor Drive Gate Driver Signal Isolation, Medical Device Patient Isolation, Solar Inverter Communications Isolation.
SPI Bus Isolation in Industrial PLCs
The MAX14851AEE+'s six unidirectional channels map directly onto 4-wire SPI (MOSI, MISO, SCLK, CS) with two spare signals for fault or interrupt lines. Its 600 Vrms isolation per UL 1577 protects low-voltage MCUs from 24 V fieldbus transients, while independent 3-5.5V supplies allow level translation between 3.3V logic and 5V sensor front-ends. The 50 Mbps ceiling exceeds typical SPI throughput at 10-20 MHz, leaving timing margin even under industrial noise.
推荐
RS-485 / RS-422 Fieldbus Isolation
Isolating RS-485 links requires at least three channels (TX, RX, DE/RE). The MAX14851AEE+ provides six channels, leaving three spare for power-good, fault, or direction-control signals common in half-duplex transceivers. Its 600 Vrms working voltage blocks ground-potential differences in long-distance bus runs, while 11.8 ns propagation delay preserves timing margin for 10 Mbps RS-485. The monolithic process eliminates discrete transformer BOM.
推荐
I2C Bus Level Translation and Isolation
I2C requires bidirectional SDA plus SCL, but the MAX14851AEE+'s six unidirectional channels can be configured as two forward plus two reverse to implement a dual-channel bidirectional isolator with two spare GPIOs. Independent 3-5.5V supplies act as a level translator between 1.8V / 3.3V MCUs and legacy 5V I2C peripherals. Designers pair this with external pull-ups and a current-isolator such as a buffer for full bidirectional I2C support.
推荐
Motor Drive Gate Driver Signal Isolation
Three-phase motor drives need six PWM signals crossing the low-voltage control / high-voltage power boundary. The MAX14851AEE+ provides exactly six channels for the three high-side plus three low-side gate-driver inputs. Its 3.2 kV/us CMTI rating rejects fast dv/dt switching events from the IGBT bridge, while 600 Vrms isolation matches the working voltage of typical 400V / 600V bus drives. Designers should still verify creepage clearance on the PCB.
推荐
Medical Device Patient Isolation
Patient-connected medical devices require reinforced isolation between applied parts and the operator console. The MAX14851AEE+'s 600 Vrms barrier and -40 C to +125 C operating range suit portable and bedside patient monitors. The six channels are sufficient for SPI-to-display plus GPIO status signals. For higher isolation grades (e.g. 5000 Vrms defibrillator-proof), designers should consider the TI ISO7762 family or Analog Devices reinforced parts.
推荐
Solar Inverter Communications Isolation
Solar string inverters must isolate the high-voltage DC bus from grid-side communications. The MAX14851AEE+'s six channels isolate RS-485 Modbus plus CAN or SPI signals between the power-stage MCU and the grid-tie controller. Independent 3-5.5V supplies simplify the dual-rail architecture common in solar designs. Its monolithic process improves long-term reliability versus optocoupler-based isolation in outdoor enclosures.
推荐
推荐产品汇总
工程参考数据： MAX14851AEE+ ——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 | MAX14851AEE+T | MAX14850ASE+ | MAX14821ETG+ | ISO7762FDWR | ISO7761DW | ISO7763FDWR |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 16-pin SSOP / QSOP | 16-pin SSOP / QSOP (same) | 16-pin SSOP (same) | 16-pin SSOP family | 16-pin SSOP (DW, same) | 16-pin SSOP (DW, same) | 16-pin SSOP (DW, same) |
| Number of Channels | 6 | 6 | 3 | 6 | 6 | 6 | 6 |
| Isolation Voltage (rms) | 600 Vrms | 600 Vrms | 600 Vrms | 600 Vrms (typical for family) | 5000 Vrms (reinforced) | 5000 Vrms (reinforced) | 5000 Vrms (reinforced) |
| Supply Voltage (each side) | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 2.25V to 5.5V | 2.25V to 5.5V | 2.25V to 5.5V |
关键差异点
- Industry-first monolithic 600 Vrms digital isolator （对比 TI ISO7762FDWR)
- Independent 3V to 5.5V supplies on each side for level translation （对比 TI ISO7762FDWR)
- Six unidirectional channels in a 16-pin SSOP （对比 MAX14850ASE+ (3-channel))
设计说明
Route the four inner GND pins (GND1 / GND2) so that side-A and side-B ground planes are kept physically separate up to the IC body - do not stitch them together under the package, as this defeats the isolation barrier. Place 0.1 uF + 10 uF decoupling on both VDDA and VDDB as close to the IC as possible. Maintain minimum 4 mm creepage across the SSOP body to preserve the 600 Vrms working voltage rating.
Avoid running high-speed traces under the MAX14851AEE+ package; the SSOP body is the only dielectric barrier, and any copper pour or trace directly underneath reduces effective creepage and clearance. Use only the inner-GND pin copper for thermal relief and side-A / side-B stitching caps. If the design needs reinforced isolation, use a TI ISO7762 with 5000 Vrms and 8 mm creepage instead of pushing 600 Vrms parts beyond their ratings.
The 11.8 ns typical propagation delay of the MAX14851AEE+ introduces a channel-to-channel skew of approximately 2-4 ns across the six channels. For timing-critical synchronous buses, include this skew in the timing budget. Channel-enable defaults are set at the factory; if a different forward/reverse mix is needed, choose a pre-configured variant or alternative from the MAX14851 family. The 50 Mbps ceiling supports 25 MHz SPI without issue.
Do not assume the MAX14851AEE+ is bidirectional - it has six unidirectional channels that must be assigned correctly to forward or reverse direction for the target interface. For I2C or any true bidirectional bus, pair it with external buffers or a dedicated bidirectional isolator. Also note that the part is specified for 600 Vrms working voltage only - applications requiring 2500 Vrms or 5000 Vrms reinforced isolation must use a higher-rated device.
Estimated: total quiescent current draw is approximately 1-2 mA per channel when active, so all six channels enabled can draw 6-12 mA total from VDDA + VDDB. Sourcing capacity of upstream LDOs should be at least 20 mA combined to maintain regulation during simultaneous switching events. Use a low-noise LDO such as the ADP7104 or TPS7A47 family on each side to minimize ripple coupling into the isolated logic signals.
合规信息
RoHS and lead-free per Analog Devices / Maxim Integrated product page. 600 Vrms isolation rated to UL 1577; IEC 60747-17 compliance per datasheet. AEC-Q100 not explicitly listed in public datasheet - consult factory for -Q1 variants.
