SS310L-R2 - 3A 100V Schottky Rectifier SMA | Taiwan Semiconductor
料号： SS310L-R2 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.18 | $0.18 |
| 10 | $0.14 | $1.40 |
| 100 | $0.09 | $9.00 |
| 500 | $0.06 | $30.00 |
| 1,000 | $0.045 | $45.00 |
SS310L-R2 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 characteristically low forward voltage drop and near-zero reverse recovery time. Within the power electronics hierarchy, it belongs to the discrete semiconductor family: diode -> rectifier diode -> Schottky barrier rectifier. These devices are the workhorse rectification elements in switching power supplies, where they convert pulsating current into DC and dissipate minimal conduction loss.
Key features of the SS310L include the 3 A average forward rectified current rating, the 100 V reverse voltage class, low forward voltage for reduced heat generation, and a metallurgically bonded construction for reliable mechanical and thermal performance. The epoxy body is UL 94 V-0 flame-retardant rated, and polarity is marked by a color band on the cathode end for easy pick-and-place orientation.
Technically, the Schottky barrier structure eliminates reverse recovery charge, so switching losses at typical SMPS frequencies of 50 kHz to several hundred kHz are negligible compared with ultrafast P-N junction diodes. The trade-off is higher reverse leakage current, which increases with temperature - designers must account for thermal runaway margins in hot environments and derate current above the specified case or lead temperature.
Typical applications include free-wheeling diodes in buck converters and relay drivers, output rectification in low-voltage switching power supplies, reverse-polarity protection in automotive and industrial inputs, and battery charging circuits where low conduction loss directly improves efficiency.
A key design consideration is thermal management: at 3 A with roughly 0.7 V forward drop, conduction loss is about 2.1 W, so adequate PCB copper area on the SMA pads is essential to keep junction temperature within rating. Estimated figures based on the 700 mV typical VF; always verify against the specific test conditions in the manufacturer datasheet.
This page synthesizes distributor pricing context, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： SS310L-R2 ——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：
SS310
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SS36
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SS54
✅ 直接替换📋 参考替代料（不在目录中）
SS34
✅ 直接替换📋 参考替代料（不在目录中）
SS54
✅ 直接替换📋 参考替代料（不在目录中）
SS310L-R2 最大额定值与电气特性
| Device Type | Schottky Barrier Rectifier |
| VRRM - Repetitive Peak Reverse Voltage | 100 V |
| IF(AV) - Average Forward Current | 3 A |
| VF - Forward Voltage | 700 mV |
| Reverse Recovery | Schottky (negligible recovery charge) |
| 封装 | SMA (DO-214AC) |
| 安装类型 | Surface Mount |
| Construction | Metallurgically bonded |
| Strain Relief | Built-in |
| Epoxy Flammability Rating | UL 94 V-0 |
| Polarity Marking | Cathode band (color) |
| Packaging Suffix | R2 (tape and reel) |
SS310L-R2 引脚配置
| 引脚 1 | Cathode — Cathode terminal, marked by color band on package body |
| 引脚 2 | Anode — Anode terminal, current enters here in forward conduction |
典型应用
SS310L-R2 适用于 6 应用s: Switch-Mode Power Supply Output Rectification, Buck Converter Free-Wheeling Diode, Reverse Polarity Protection, Relay and Solenoid Coil Clamping, Battery Charger and OR-ing Circuits, Automotive and Industrial Auxiliary Rectification.
Switch-Mode Power Supply Output Rectification
The SS310L serves as the output or secondary-side rectifier in flyback and forward converters. Its Schottky barrier structure has essentially zero reverse recovery time, eliminating the turn-on loss that a P-N junction diode would impose on the switching MOSFET, while the 700 mV forward drop limits conduction loss at the 3 A rating. In a 5 V output rail, the diode drop alone consumes about 14 percent of the output voltage, so efficiency-conscious designs appreciate the Schottky advantage over a standard 1 V-class silicon rectifier. Place the device close to the transformer secondary, with generous copper pour on both SMA pads; at 3 A and 0.7 V the estimated dissipation is about 2.1 W, so thermal spreading is the main layout constraint.
推荐
Buck Converter Free-Wheeling Diode
In asynchronous buck converters and buck-boost topologies, the SS310L free-wheels inductor current during the switch off-time. Because a Schottky diode has negligible reverse recovery charge, the power MOSFET does not incur the reverse-recovery current spike that an ultrafast P-N diode would cause at turn-on, reducing switching loss and EMI. The 100 V rating covers input rails up to roughly 60-80 V with derating margin. Designers should note that the free-wheeling diode dissipates approximately VF x IOUT x (1-D); at 0.7 V and 3 A with a 50 percent duty cycle that is an estimated 1.05 W. For light loads, synchronous rectification improves efficiency further, but the SS310L remains the simplest robust choice for cost-driven boards.
推荐
Reverse Polarity Protection
Connected in series with a DC input, the SS310L blocks reverse connection with only about 0.7 V of forward loss, protecting downstream electronics from reversed battery or supply wiring. The 100 V class gives margin against inductive kick and transient events on industrial and automotive-style inputs. Compared with a conventional silicon rectifier at the same current, the Schottky halves the voltage penalty and roughly halves dissipation; at 3 A the estimated conduction loss is 2.1 W, so board copper area matters. The alternative shunt-fuse approach wastes no voltage but requires service intervention, whereas the diode solution self-recovers once polarity is corrected - ideal for field-deployed equipment and user-replaceable battery packs.
推荐
Relay and Solenoid Coil Clamping
When a relay, contactor, or solenoid coil is switched off, its stored inductive energy produces a voltage spike that can destroy the driving transistor. The SS310L placed across the coil clamps that spike by freewheeling coil current through the diode. The 100 V rating comfortably covers 24 V and 48 V coil systems with large transient margin, and the 3 A rating handles coil inrush well beyond typical relay coil holding currents of tens to hundreds of milliamperes. The SMA package solders directly across coil terminals or on the driver PCB. Trade-off: a plain Schottky clamp slows contact release due to the low conduction voltage; a series Zener or TVS can accelerate drop-out when fast release is required.
推荐
Battery Charger and OR-ing Circuits
The SS310L is widely used as a series rectifier between a charging source and a battery, or as a simple diode-OR element between a battery and an adapter input. The low 700 mV forward drop directly translates into recovered charge time and less heat in enclosed battery compartments, while the 100 V rating covers multi-cell and industrial charging stacks. In diode-OR configurations, the Schottky prevents back-feeding between sources; the ~0.7 V drop must be budgeted in low-voltage logic rails. At charging currents near the 3 A rating, estimated dissipation is about 2.1 W, so mount the device with solid thermal pads. For sub-1 percent loss OR-ing, ideal-diode MOSFET controllers are the upgrade path when efficiency targets tighten.
推荐
Automotive and Industrial Auxiliary Rectification
In 12 V and 24 V vehicle and factory systems, the SS310L handles auxiliary rectification tasks such as alternator sensing, lamp and actuator freewheeling, and small auxiliary supply rails. The 100 V rating provides large margin over 14 V and 28 V system clamping events, and the molded UL 94 V-0 SMA body withstands the vibration and thermal cycling typical of these environments thanks to its built-in strain relief and metallurgically bonded die attach. Reverse leakage of a Schottky roughly doubles every 10 C, so under-hood placements near 100 C ambient should include leakage-driven self-heating checks in the derating analysis. Designers targeting formal AEC-Q100 builds should request the qualified variant or equivalent from Taiwan Semiconductor.
推荐
推荐产品汇总
工程参考数据： SS310L-R2 ——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 | SS310 | SS36 | SS54 | SS34 |
|---|---|---|---|---|---|
| Package | SMA (DO-214AC) | SMA (DO-214AC) - same | SMA (DO-214AC) - same | SMA (DO-214AC) - same | SMA (DO-214AC) - same |
| Brand | Taiwan Semiconductor | Taiwan Semiconductor | Taiwan Semiconductor | Taiwan Semiconductor | onsemi |
| VRRM (Reverse Voltage) | 100 V | 100 V | 60 V | 40 V | 40 V |
| IF(AV) (Average Forward Current) | 3 A | 3 A | 3 A | 5 A | 3 A |
| Reverse Recovery | Schottky (negligible) | Schottky (negligible) | Schottky (negligible) | Schottky (negligible) | Schottky (negligible) |
| Drop-in Feasibility on SMA Footprint | Reference | Yes - pin-to-pin, full rating match | Yes - pin-to-pin, lower VRRM | Yes - pin-to-pin, higher IF / lower VRRM | Yes - pin-to-pin, lower VRRM |
关键差异点
- Full 100 V class in the SMA footprint （对比 SS34)
- L-series mechanical robustness （对比 SS310)
- Lower reverse voltage headroom than high-current siblings （对比 SS54)
设计说明
At the full 3 A rating with a 700 mV forward drop, the SS310L dissipates an estimated 2.1 W (P = VF x IF). The SMA package relies on the two solder pads for heat extraction, so allocate at least 100 mm2 of copper on each pad or connect to a plane to keep junction temperature within rating. Derate current at elevated ambient per the datasheet derating curve; reverse leakage, which doubles roughly every 10 C, adds a self-heating term that can compound in sealed enclosures.
Place the SS310L close to the switching element or coil terminal it protects to minimize loop inductance - long traces add ringing that raises reverse voltage stress above the DC bus. Use wide, short tracks sized for 3 A continuous current (at least 2 mm wide on 1 oz copper for moderate temperature rise). Solder both SMA terminals fully; a partially wetted pad doubles the thermal resistance of the joint and is a common cause of field failures in rectifier designs.
Confirm the reverse voltage grade before substitution: distributor listings for the SS310L family show both 100 V and 60 V designations, and same-footprint siblings (SS32-SS36 series) range from 20 V to 60 V. Applying a 40 V or 60 V part on a circuit that sees reverse transients near 100 V will cause avalanche failure. Also note the cathode band polarity - reverse-mounting a series protection diode blocks the supply entirely at power-up.
Do not parallel Schottky rectifiers without ballast: forward voltage has a negative temperature coefficient, so the device that heats first steals current from its neighbor and can enter thermal runaway. If more than 3 A is required, choose a higher-current sibling such as the SS54 (5 A, same SMA footprint) rather than paralleling two SS310L parts on a shared copper pour.
合规信息
Compliance documents were not included in the retrieved data for the exact SS310L-R2 ordering code. Request a certificate of conformity from Taiwan Semiconductor or XAIPART for RoHS/REACH-audited builds.
