SS310L - 3A 100V Schottky Barrier Rectifier | Taiwan Semiconductor
MPN： SS310L ✓ 啟用中SS310L 概覽
A Schottky barrier rectifier is a type of power diode that uses a metal-semiconductor junction instead of a P-N junction, producing a significantly lower forward voltage drop (typically around 0.5 V to 0.7 V at rated current for a 100 V class device) and near-zero reverse recovery charge. Within the power-management hierarchy, it belongs to the rectifier diode family, itself a subset of discrete power semiconductors used for AC-to-DC conversion and reverse-polarity protection.
Key differentiating characteristics of the SS310L include its 3 A average forward rectified current rating, its 100 V repetitive peak reverse voltage (VRRM) - the top of the SS3xL series voltage range that spans 40 V to 100 V per the manufacturer datasheet - and its compact Sub-SMA footprint suited to space-constrained boards. The 'L' suffix designates the low-profile, lead-free package variant.
Technically, the majority-carrier Schottky structure delivers fast switching with essentially no reverse recovery, reducing switching losses in high-frequency converters. Thermal performance depends on PCB copper area because the SMA-style package dissipates power primarily through its solderable terminations; derating above ambient temperature follows the manufacturer's power-versus-temperature curve.
Typical applications include low-voltage DC-DC converter output rectification and freewheeling, reverse-polarity and ORing protection in battery-powered equipment, and polarity protection on power adapters and charging ports. Its low forward drop directly reduces conduction loss and heat in these roles.
Design consideration: at a 3 A load with an estimated 0.6 V forward drop, conduction dissipation is roughly 1.8 W, so generous copper pour on both terminations is recommended to keep junction temperature within the +125C maximum. Never substitute a lower-voltage (e.g., 40 V SS34L) part where transients can exceed 100 V.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 SS310L — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： SS310L （相同外形與佔位） — 差異在於 Configuration, Package.
SS310
✅ 直接替換📋 參考替代品（不在目錄中）
SS310
✅ 直接替換📋 參考替代品（不在目錄中）
SS310
✅ 直接替換📋 參考替代品（不在目錄中）
SS310L
✅ 直接替換聯絡詢價
查看資料表 →SS310L
✅ 直接替換聯絡詢價
查看資料表 →SS34L
✅ 直接替換📋 參考替代品（不在目錄中）
SS310L 最大額定值與電氣特性
| Device Type | Schottky Barrier Rectifier |
| Configuration | Single Diode |
| Repetitive Peak Reverse Voltage (VRRM) | 100 V |
| Average Forward Rectified Current | 3 A |
| Series | SS3xL (40 V to 100 V range) |
| 安裝類型 | Surface Mount |
| 封裝 | Sub SMA (low-profile SMA / DO-214AC style) |
| 工作接面溫度 | -55C to +125C |
| Reverse Recovery | Schottky (majority carrier, near-zero recovery) |
| Lead-Free / Low Profile Suffix | L (lead-free low-profile variant) |
| Typical Application | Low-voltage rectification, freewheeling, reverse polarity protection |
SS310L 腳位配置
| 腳位 1 | Cathode — Cathode terminal, marked by polarity band on body |
| 腳位 2 | Anode — Anode terminal |
典型應用
SS310L 適用於 6 應用s: DC-DC Converter Output Rectification, Reverse Polarity Protection, Freewheeling / Catch Diode in Inductive Loads, Diode-OR Power Supplies, Low-Voltage High-Frequency Rectification, Battery-Powered Consumer Electronics.
DC-DC Converter Output Rectification
The SS310L's 3 A average rectified current and near-zero reverse recovery make it a strong output-rectifier choice for buck and flyback converters. In a Schottky rectifier, conduction loss dominates rather than switching loss, so the low forward drop of this 100 V-class device directly improves converter efficiency - a 0.6 V drop at 3 A dissipates roughly 1.8 W (estimated), which sets the copper-area requirement. It is placed from the switch node to ground with the cathode at the output in a buck; layout should minimize the loop area with the inductor and output capacitor to control ringing. The 100 V VRRM gives generous margin on voltage spikes from transformer leakage inductance.
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Reverse Polarity Protection
In battery-powered and adapter-fed equipment, the SS310L is placed in series with the positive supply so that reversed input simply reverse-biases the diode instead of damaging downstream electronics. Its Schottky forward drop minimizes the voltage penalty in a 5 V or 12 V rail, and the 100 V reverse rating withstands even the highest common battery bus voltages with margin. Because dissipation equals load current times forward voltage, the design should verify the derating curve at the board's maximum ambient temperature; parallel copper pour under both SMA terminations keeps junction temperature inside the +125C limit at multi-amp loads.
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Freewheeling / Catch Diode in Inductive Loads
When driving relays, solenoids, or DC motors with a low-side switch, the SS310L clamps the inductive kick: the diode conducts at switch turn-off, holding the node near one forward drop above the rail. The Schottky construction recovers essentially instantly, so it does not delay subsequent switching cycles the way a slow rectifier would, and the 3 A rating handles the freewheel current of most small relays and actuators. The 100 V rating covers 24 V industrial rails comfortably. Place the diode physically across or beside the load or switch to keep the clamp loop short and limit EMI from the fast current transition.
推薦
Diode-OR Power Supplies
For systems combining an AC adapter and a battery or two redundant supplies, one SS310L per source isolates the inputs so a failed or unpowered source does not back-feed the other. The Schottky drop costs efficiency, but at 100 V rating this device covers telecom and industrial nominal buses with wide transient margin. Engineers should account for the forward drop in the minimum downstream input voltage and size the copper for continuous worst-case load current; at multi-amp loads the diode-OR approach trades roughly 1.5 W to 2 W of heat (estimated at 3 A) for simplicity compared with an ideal-diode controller, making it attractive in cost-driven designs.
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Low-Voltage High-Frequency Rectification
Switching converters operating at hundreds of kilohertz need rectifiers whose reverse recovery does not dominate loss budgets. The SS310L, as a majority-carrier Schottky barrier rectifier, has negligible stored charge, so each switching cycle costs only conduction loss rather than a recovery-current spike. This makes it suitable for output rectification in flyback adapters and auxiliary supplies from medium-voltage buses, where its 100 V VRRM provides reflected-voltage headroom. Verify the datasheet's forward-current derating at the switching frequency, because Schottky parts also carry a fixed capacitive-charge loss that grows with frequency and reverse voltage.
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Battery-Powered Consumer Electronics
Portable chargers, power banks, and small appliances use the SS310L in charge-path blocking and output-protection roles, where its low-profile Sub SMA outline fits thin enclosures and its commodity pricing keeps bill-of-material costs in the cent range. The -55C to +125C junction range covers typical consumer derating requirements, and the 3 A rating matches USB-style charge currents. Designers should confirm that continuous charge current plus a hot enclosure ambient stays within the derated curve; otherwise a parallel device or a larger package is needed. The cathode band simplifies automated optical inspection of assembly polarity.
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推薦產品摘要
工程參考資料，適用於 SS310L — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | SS310 | SS310L (JUXING) | SS310L (GOODWORK) | SS34L |
|---|---|---|---|---|---|
| Package | Sub SMA (low-profile SMA / DO-214AC style) | SMA (DO-214AC) | SMA (DO-214AC) - same | SMA (DO-214AC) - same | Sub SMA (low-profile SMA) - same |
| Brand | Taiwan Semiconductor | Diodes Incorporated / Vishay / onsemi | JUXING | GOODWORK | Taiwan Semiconductor |
| Reverse Voltage (VRRM) | 100 V | 100 V | 100 V | 100 V | 40 V |
| Average Forward Current | 3 A | 3 A | 3 A | 3 A | 3 A |
| Reverse Recovery | Schottky (near-zero) | Schottky (near-zero) | Schottky (near-zero) | Schottky (near-zero) | Schottky (near-zero) |
主要差異化特點
- Highest voltage grade of the SS3xL family (對比SS34L)
- Low-profile lead-free package (對比SS310 (Diodes Inc / Vishay / onsemi))
- Commodity cost with multi-source availability (對比SS310L (JUXING / GOODWORK))
設計說明
The SMA-outline SS310L dissipates heat almost entirely through its two solderable terminations. Estimated: at 3 A with an assumed 0.6 V forward drop, dissipation reaches about 1.8 W - high for this package. Provide generous copper pour on both pads (typically several square centimeters each side of the board), and add thermal stitching vias to internal planes when available. Check the manufacturer's power-versus-ambient-temperature derating curve from the Taiwan Semiconductor SS3xL datasheet before committing to continuous full-load operation in a warm enclosure.
In switching converters, keep the loop formed by the SS310L, the power switch, the transformer or inductor, and the output capacitor as small as possible. A tight loop minimizes parasitic inductance, which reduces voltage ringing on the switch node and the resulting stress on the diode's 100 V reverse rating, and also cuts radiated EMI. Place the diode pads adjacent to the switch node and use short, wide traces for the high di/dt current path rather than routing the rectifier current through long thin connections.
Three recurring mistakes: (1) substituting the 40 V SS34L for the 100 V SS310L in positions with inductive spikes, causing avalanche failure; (2) ignoring the cathode band polarity - reversed SMA diodes apply full rail voltage forward-biased and fail destructively; (3) assuming the forward drop is fixed - Schottky VF rises with current and falls with temperature, so hot, heavily loaded boards dissipate somewhat less than room-temperature calculations suggest, but leakage current roughly doubles every 10 C, increasing off-state loss in high-temperature, high-voltage standby conditions.
合規資訊
The 'L' suffix denotes Taiwan Semiconductor's lead-free low-profile package variant; SS3xL series is produced as a RoHS-compliant lead-free line. Obtain formal RoHS/REACH certificates of conformance from the manufacturer at volume procurement.
