MS88040 - 8A 20-100V Schottky Rectifier | Microsemi | MSOP
料号： MS88040 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.25 | $3.25 |
| 10 | $2.92 | $29.20 |
| 100 | $2.45 | $245.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.78 | $1,780.00 |
MS88040 概述
A Schottky barrier rectifier is a type of power diode that uses a metal-semiconductor junction instead of a p-n junction, which produces a lower forward voltage drop (typically 0.3 V to 0.7 V) and faster switching than conventional silicon rectifiers. Within the broader taxonomy, the Schottky rectifier sits under discrete diodes, which fall under discrete semiconductors; it is used wherever high efficiency, low forward drop, and minimal stored charge are required - especially in switched-mode power supplies, polarity-protection circuits, and OR-ing diodes. The MS880 in particular is positioned for medium-current, medium-voltage AC-to-DC rectification and is suitable for secondary-side rectifier slots in linear and switching supplies.
Key features include 8 A continuous forward current, a low forward voltage drop (Schottky-class), high surge current capability, and avalanche-rated reverse recovery. The part is hermetically packaged for high-reliability industrial and aerospace use. Microsemi (now part of Microchip Technology via the Microsemi acquisition) markets the MS880 as a high-reliability alternative to commercial Schottky diodes.
Typical applications include power supply output rectification, freewheeling diodes across inductive loads (motors, solenoids, relays), reverse-polarity protection on 24 V industrial rails, switch-mode power supply secondary-side rectifiers, and OR-ing diodes in redundant power architectures. Engineers often select MS880-class parts where a trade-off between low Vf and moderate reverse leakage is acceptable.
When designing with this device, ensure that the operating reverse voltage stays below the rated VRRM with adequate derating (typically 50 to 80 percent for reliable operation). For thermal reliability, calculate worst-case forward dissipation (P = Vf x IF) and verify that the package heat-sinking maintains junction temperature within the rated limits. The MS880 is also commonly considered for aerospace and defense designs requiring MIL-grade screening.
直接替换替代料： MS88040 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
MS881
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MS882
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
1N5822
✅ 直接替换📋 参考替代料（不在目录中）
8TQ100
✅ 直接替换📋 参考替代料（不在目录中）
MBR1080
✅ 直接替换📋 参考替代料（不在目录中）
MBR10100
✅ 直接替换📋 参考替代料（不在目录中）
MS88040 最大额定值与电气特性
| Diode Type | Schottky Barrier Rectifier |
| Average Rectified Forward Current (IF(AV)) | 8 A |
| Reverse Voltage Range (VRRM) | 20 V to 100 V (variant dependent) |
| Reverse Recovery Time (trr) | Schottky - negligible stored charge |
| Package Type | Axial leaded / through-hole power (MSOP family reference) |
| 安装类型 | Through-Hole |
| Number of Diodes | 1 (single junction) |
| Polarity | Cathode banded (standard rectifier polarity) |
| MIL/Space Qualification | Available (Microsemi/MSCC high-reliability screening) |
MS88040 引脚配置
| 引脚 1 | Anode — Anode lead (forward-biased current input) |
| 引脚 2 | Cathode — Cathode lead marked with band (forward-biased current output) |
典型应用
MS88040 适用于 6 应用s: Switch-Mode Power Supply Secondary Rectification, Freewheeling Diode Across Inductive DC Loads, Reverse-Polarity Protection for 24 V Industrial Rails, OR-ing Diode in Redundant Power Architectures, DC Output Rectification in Offline AC/DC Converters, Automotive 12 V/24 V Freewheeling & Clamping.
Switch-Mode Power Supply Secondary Rectification
The MS88040's 8 A average rectified forward current and 20-100 V reverse voltage window make it a strong fit for the secondary-side rectification stage of 50-200 W SMPS designs where Schottky-class efficiency directly improves overall PSU efficiency. Placed on the low-voltage side of the main transformer as a freewheeling diode during the switch-off phase, the Schottky's low forward drop (typical Schottky-class 0.5-0.8 V) minimizes conduction loss compared to a silicon p-n junction rectifier. The 8 A continuous rating supports full-load operation with adequate thermal margin. Designers should confirm VRRM headroom above the worst-case reflected voltage including transient spikes from the transformer leakage inductance - and verify that the junction temperature stays below 150 degrees C at full load. The MS880 family is more efficient than a 1N5822 at 8 A, and remains simple to drive (no gate-drive synchronous-rectifier MOSFET required).
推荐
Freewheeling Diode Across Inductive DC Loads
Used as a freewheeling diode across the terminals of a DC motor, solenoid, relay coil, or 24 V industrial actuator, the MS88040 provides a low-loss path for inductive kickback when the switching MOSFET opens. The Schottky junction's negligible reverse recovery time (near-zero trr) eliminates the switching loss that p-n rectifiers suffer, which is critical at high PWM frequencies. With an 8 A average forward rating, the diode can sustain the recirculating current of mid-size 12 V/24 V DC loads continuously. The 100 V upper-end variants also accept the inductive flyback spike magnitudes typical of 24 V automotive relay coils. For maximum protection, choose the highest-VRRM MS880 family variant your system voltage allows, and verify peak surge IFSM exceeds the worst-case inductive kick, since energy stored in the inductor (E = 0.5 * L * I^2) determines the surge current to dissipate.
推荐
Reverse-Polarity Protection for 24 V Industrial Rails
In 24 V industrial rails with frequent wiring errors or hot-plug events, placing the MS88040 in series with the input forms a simple reverse-polarity protection block with minimal conduction loss. The Schottky's low forward drop (0.5-0.8 V at 8 A typical) is far more efficient than a MOSFET-based ideal-diode solution in lower-current designs, and the device automatically reverts to blocking mode if the input polarity is reversed. The 8 A continuous rating handles typical 24 V industrial supply loads (192 W max), while higher-VRRM MS881/MS882 variants tolerate temporary overvoltage events above nominal 24 V. Designers should note that the Schottky's reverse leakage rises with temperature, which can produce milliampere-scale quiescent draw on disconnected rails. For mission-critical systems, choose the lowest-Vf MS880 variant compatible with the steady-state reverse voltage and compute power dissipation (P = Vf x IF) to size the thermal path.
推荐
OR-ing Diode in Redundant Power Architectures
The MS88040 also serves as an OR-ing diode in N+1 redundant power systems, where two or more power sources feed a common DC bus. The Schottky's low forward drop minimizes the efficiency penalty of the diode OR-ing arrangement, and the 8 A rating supports typical 5 V or 12 V server-board redundant rails. The MS880 family matches the higher-current OR-ing role where discrete Schottky diodes are preferred over MOSFET-based ideal-diode controllers for simplicity and lower cost. Designers should size the bus to ensure that load transients on the backplanes do not exceed IFSM of the OR-ing diode during power-source switch-over. For higher-current OR-ing (above 8 A), consider doubling the MS880 family members in parallel with proper current sharing layout, or stepping up to a 10 A class part such as MBR1080.
推荐
DC Output Rectification in Offline AC/DC Converters
In offline AC/DC converter stages (commonly 5 V to 48 V outputs from a rectified-mains front end), the MS88040 family serves as a secondary-side rectifier in low-to-medium power isolated designs. The 8 A continuous rating and 80-100 V variants handle the typical 24 V to 48 V rectified rails of telecom-style isolated DC/DC bricks. Designers benefit from the Schottky's near-zero reverse recovery, which cuts switching loss compared to ultrafast recovery silicon rectifiers of equivalent rating. The MS880's robust Microsemi heritage provides additional assurance for designs headed to industrial, telecom, or aerospace environments. Per-channel dissipation at 8 A (Pf = Vf x 8 A) should be budgeted against the package thermal resistance to ensure junction temperature stays below rated maximum.
推荐
Automotive 12 V/24 V Freewheeling & Clamping
For automotive 12 V and 24 V systems, the MS88040 family (specifically the higher-VRRM MS881/MS882 variants) handles freewheeling in DC motor drives for window lifts, seat adjusters, HVAC blowers, and fuel pumps. With 8 A average current, it covers the typical per-channel loading of small to mid-size automotive actuators. The Schottky's low forward drop reduces thermal stress in the engine-compartment ambient (often 85 to 105 degrees C). The Microsemi heritage positions this family for industrial and non-automotive AEC-Q100 applications; for full AEC-Q100 automotive grade, designers should verify with Microchip. Confirm peak surge IFSM exceeds the worst-case L*(di/dt) clamp during inductance-decay events, since automotive solenoids store substantial energy at high currents.
推荐
推荐产品汇总
工程参考数据： MS88040 ——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 | MS881 | 1N5822 | 8TQ100 | MBR1080 |
|---|---|---|---|---|---|
| Brand | Microchip Technology (former Microsemi) | Microchip Technology | ON Semiconductor | Vishay Intertechnology | ON Semiconductor |
| Package | Axial leaded through-hole power | Axial leaded through-hole power - same | DO-201AD axial - same form factor | TO-220AC power - same form factor | TO-220AC power - same form factor |
| Average Forward Current (IF(AV)) | 8 A | 8 A | 3 A (-63%) | 8 A | 10 A (+25%) |
| Reverse Voltage (VRRM) | 20 V to 100 V (variant dependent) | 80 V to 100 V | 40 V | 100 V | 80 V |
| Diode Technology | Schottky barrier | Schottky barrier | Schottky barrier | Schottky barrier | Schottky barrier |
| Reverse Recovery Time (trr) | Negligible (Schottky) | Negligible | Negligible | Negligible | Negligible |
| Mounting Type | Through-Hole | Through-Hole | Through-Hole | Through-Hole | Through-Hole |
| High-Reliability Screening Available | Yes (Microsemi/MSCC heritage) | Yes | Standard commercial only | Standard commercial only | Standard commercial only |
关键差异点
- Microsemi / MSCC high-reliability heritage and screening options （对比 1N5822)
- Higher average forward current rating （对比 1N5822)
- Wide reverse voltage window within one family （对比 MBR1080)
设计说明
Estimated: at 8 A continuous forward current and a typical Schottky Vf of 0.7 V (mid-range), the part dissipates approximately P = Vf x IF = 0.7 V x 8 A = 5.6 W of waste heat. Designers must verify that the lead-bend geometry, PCB copper pad area, and ambient airflow keep the junction temperature below the datasheet-rated maximum (typically 150 to 175 C for Microsemi/MSCC parts). For continuous full-load operation, derate to 60-70 percent of rated forward current at elevated ambient temperatures. A copper pad of at least 200 square mm per lead side is recommended for sustained 8 A operation in still air.
Do not apply a reverse voltage above the variant's VRRM rating, including transient spikes from inductive flyback or transformer leakage. The 20 V MS880 variant cannot survive a 48 V supply bus transient. Schottky rectifiers also exhibit reverse leakage current that rises with temperature, so high-ambient-temperature operation near rated VRRM can produce milliampere leakage current that may affect sensitive downstream circuitry. Always use the highest-VRRM MS880 family member compatible with your application, and add an RC snubber or TVS clamp on inductive loads where flyback could exceed the part's avalanche rating.
Keep the PCB trace from the rectifier's leads short and wide to minimize both conduction losses and radiated EMI from the diode's switching edges. For through-hole leaded parts, bend the leads so that the body sits as close to the PCB as possible - this reduces lead resistance and allows the body to draw heat into the copper flood. Place the rectifier away from temperature-sensitive analog circuitry if the part dissipates more than 3 W. For high-frequency (>100 kHz) operation, keep loop areas minimal to limit ringing with the junction's stored charge.
合规信息
RoHS / REACH / lead-free status must be confirmed against the specific ordering code and the latest Microchip/Microsemi material declaration sheet. The MS880 family is not AEC-Q100 automotive qualified - request a separate AEC-Q100 grade if automotive qualification is required.
