VS-30BQ015-M3/9AT - 3A 15V Schottky Rectifier SMC | Vishay
MPN: VS-30BQ015-M3/9AT ✓ AktifVS-30BQ015-M3/9AT Genel Bakış
A Schottky rectifier is a semiconductor diode that uses a metal-semiconductor junction instead of a PN junction, producing a lower forward voltage drop (typically 0.3-0.5 V versus 0.7-1.0 V for PN-junction rectifiers) and faster switching. Schottky rectifiers sit within the diode family, which itself belongs to discrete semiconductors used for rectification, freewheeling, and reverse-polarity protection. They are preferred in low-voltage, high-efficiency power conversion stages where conduction losses dominate.
Key features include a forward current of 3.0 A at TC = 105 °C, repetitive peak reverse voltage (VRRM) of 15 V, ultralow forward voltage drop, guard-ring construction that improves avalanche robustness, and RoHS-compliant matte-tin terminations. The single-die design minimizes thermal resistance and enables compact PCB placement in dense power layouts.
Technically, the device uses a Schottky barrier with controlled leakage current across the rated reverse voltage. Its low VF reduces conduction loss, while the guard-ring suppresses edge breakdown that traditionally limits Schottky reliability. The trade-off is a higher reverse leakage than a PN rectifier of equivalent rating - acceptable in low-voltage (<30 V) rails but not in high-voltage applications.
Typical applications include disk drives, switching power supplies, DC-DC converters, freewheeling diodes for motor drives, and low-voltage OR-ing / battery protection circuits where low forward drop directly improves efficiency.
When designing with this part, verify that the application's reverse voltage never exceeds 15 V repetitive or 25 V non-repetitive, and derate the forward current aggressively above 105 °C board temperature. Solder the cathode tab to a copper pad sized to absorb the conduction loss.
This page synthesizes distributor pricing, drop-in alternatives, and practical thermal guidance not consolidated in the manufacturer datasheet.
Drop-in alternatifler için VS-30BQ015-M3/9AT — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
VS-30BQ015-M3/9AT
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →VS-30BQ015PBF
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VS-30BQ015-M3/9AT Maksimum Değerlendirmeler & Elektriksel Özellikler
| Rectifier Type | Schottky |
| Configuration | Single |
| Maximum Repetitive Peak Reverse Voltage (VRRM) | 30 V |
| Maximum DC Reverse Voltage (VR) | 15 V (continuous); operation up to 125 °C TJ below 5 V |
| Average Rectified Forward Current (IF(AV)) | 3.0 A at TC = 100 °C (per datasheet title) |
| Forward Voltage Drop (VF) | Ultralow (see datasheet curve) |
| Reverse Leakage Current (IR) | Low (guard-ring construction) |
| İşletim Jant Sıcaklığı Aralığı | -40 °C to +125 °C (VR < 5 V); derated above 5 V |
| Paket | DO-214AB (SMC) |
| Montaj Türü | Surface Mount |
| Construction | Single die with guard ring |
| RoHS Durumu | Compliant |
| Lead Finish | Matte tin (lead-free) |
| MSL Seviyesi | 1 (per JEDEC J-STD-020, industry standard for SMC Schottky) |
VS-30BQ015-M3/9AT Pin Yapısı
| Pin 1 | Cathode — Marked by band on body. Connect to positive rail in reverse-polarity protection; serves as the rectifier output in a forward-biased configuration. |
| Pin 2 | Anode — Marked by beveled edge. Connects to the supply or switching node feeding the rectifier. |
Forward Current vs Forward Voltage (Schottky)
Tipik Uygulamalar
VS-30BQ015-M3/9AT için uygundur 7 uygulamas: Switching Power Supply Output Rectifier, DC-DC Converter Freewheeling Diode, Hard Disk Drive Power Rectification, Battery-Powered Portable Device Charging, Low-Voltage OR-ing and Redundancy, Motor Drive Freewheeling and Clamping, Polarity Protection and Reverse-Blocking.
Switching Power Supply Output Rectifier
The VS-30BQ015-M3/9AT fits low-voltage output rectification in 5 V and 12 V switching supplies because of its 3 A average current rating and ultra-low Schottky forward drop. Its 30 V VRRM provides ample margin against transformer ringing on the secondary side, while the SMC footprint keeps the rectifier close to the output inductor for tight thermal coupling. Using this part in place of a PN rectifier typically cuts rectifier losses by 30-40% at 3 A load.
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DC-DC Converter Freewheeling Diode
In buck and boost converters operating below 15 V output, the VS-30BQ015-M3/9AT serves as a freewheeling (catch) diode carrying inductor current during the switch off-time. Its low forward drop reduces voltage drop on the inductor and improves light-load switching efficiency, while the guard-ring construction survives the repetitive reverse recovery stress of continuous conduction. Designers should keep the loop from the diode to the switch minimal to limit inductive transients.
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Hard Disk Drive Power Rectification
Disk drives operate from low-voltage rails (5 V and 12 V) and require compact, thermally efficient rectifiers in tight enclosures. The VS-30BQ015-M3/9AT, called out explicitly in the Vishay datasheet as a target application, fits 3 A motor regulation and 5 V logic supply rectification with its SMC package dissipating heat into the small chassis. Its single-die construction and low thermal resistance make it ideal for the cramped, high-density PCB layouts typical in HDD electronics.
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Battery-Powered Portable Device Charging
In single-cell Li-ion charging circuits and battery-OR configurations, the VS-30BQ015-M3/9AT acts as a low-drop Schottky blocking diode or reverse-polarity guard. Its ultra-low forward drop at the 1-2 A typical charge current preserves battery runtime by 3-5% compared to PN diodes, while the 30 V reverse rating tolerates USB-VBUS and charger overshoot transients. The compact SMC package is suitable for portable devices with tight B+ and B- land patterns.
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Low-Voltage OR-ing and Redundancy
For 12 V redundant power architectures in telecom or server backplanes, the VS-30BQ015-M3/9AT provides efficient OR-ing between two parallel supplies. Its low forward drop reduces heat dissipation on each parallel path by 30% versus a 1N540x PN diode, while the SMC footprint simplifies PCB layout in dense power-distribution boards. Designers should add a small RC snubber across the diode if the supplies share a common ground path.
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Motor Drive Freewheeling and Clamping
Small brushed DC motors and solenoid drivers operate below 15 V and need a freewheeling path for inductive kickback. The VS-30BQ015-M3/9AT clamps the inductive voltage spike while sustaining repetitive peak currents during PWM switching. Its 30 V VRRM handles typical 12 V motor systems with margin, though designers should verify peak inverse voltage stays within the part's repetitive rating to avoid long-term degradation of the Schottky barrier.
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Polarity Protection and Reverse-Blocking
As a series reverse-polarity protection diode on DC input rails up to 15 V, the VS-30BQ015-M3/9AT blocks reverse-battery connection while delivering ultralow forward drop at full load current. The SMC footprint integrates easily into power-input sections of consumer and industrial products, and the guard-ring construction survives the initial inrush when bulk capacitors charge from a correctly-polarized source. For systems above 15 V, choose a higher VRRM part.
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Önerilen Ürünler Özeti
Mühendislik referans verileri: VS-30BQ015-M3/9AT — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | VS-30BQ015PBF | VS-30BQ015TRPBF | 30BQ015 | SS34-E3/9AT | B340LA-13-F | MBRS340 |
|---|---|---|---|---|---|---|---|
| Brand | Vishay | Vishay | Vishay | Vishay | Vishay | Diodes Incorporated | onsemi |
| Package | DO-214AB (SMC) | DO-214AB (SMC) - same | DO-214AB (SMC) - same | DO-214AB (SMC) - same | DO-214AB (SMC) - same | DO-214AB (SMC) - same | DO-214AB (SMC) - same |
| Average Rectified Forward Current (A) | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 |
| Repetitive Peak Reverse Voltage (VRRM, V) | 30 | 30 | 30 | 30 | 40 | 40 | 40 |
| DC Reverse Voltage (V) | 15 | 15 | 15 | 15 | 40 | 40 | 40 |
| Forward Voltage Drop (V at 3 A) | Ultralow (~0.44, see curve) | Ultralow (~0.44) | Ultralow (~0.44) | Ultralow (~0.44) | Low (~0.50) | Low (~0.50) | Low (~0.50) |
| Guard-Ring Construction | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Lead-Free / RoHS | Yes (M3 matte-tin) | Yes (PBF) | Yes (PBF) | Depends on sub-variant | Yes (E3 matte-tin) | Yes (-F suffix) | Yes |
Ana Farklılayıcılar
- Ultra-low forward voltage drop at 3 A in SMC package (karşılaştırma:1N5408 (PN rectifier))
- Guard-ring construction for avalanche ruggedness (karşılaştırma:Generic Schottky without guard ring)
- 30 V VRRM specifically tuned for 12 V rails (karşılaştırma:SS34 (40 V VRRM))
- Lead-free matte-tin M3 terminations, RoHS compliant (karşılaştırma:Older leaded-package alternatives)
Tasarım Notları
Estimated: at 3.0 A DC forward current with a forward drop of 0.44 V, conduction loss is approximately 1.32 W. On a 1 oz copper SMC pad with no airflow, junction-to-ambient thermal resistance of typical SMC footprints is 50-65 °C/W, so the junction rises 65-85 °C above ambient. Sustained 3 A operation requires either forced airflow, larger copper area, or 50% current derating. Use the datasheet thermal curves and pad geometry to compute the exact derating for your board.
The DO-214AB (SMC) cathode pad is the larger thermal tab and should be soldered to a copper area of at least 100 mm² to provide adequate heatsinking. Keep the trace from the diode to the switching node short and wide to minimize parasitic inductance, which can cause reverse-voltage spikes that exceed VRRM during switching transients. For high-frequency designs, pair the diode with a small RC snubber across its terminals.
Do not operate the VS-30BQ015-M3/9AT continuously at reverse voltages above 15 V DC or above 30 V repetitive peak, as the Schottky barrier will conduct reverse leakage that dissipates power and overheats the junction. Also avoid exceeding 125 °C junction temperature - above this point the leakage current increases exponentially, potentially causing thermal runaway. Inductive load applications must include a snubber or TVS clamp to limit kickback transients within VRRM.
Uyumluluk Bilgisi
RoHS compliant per Vishay product page and DigiKey listing. M3 suffix denotes lead-free matte-tin terminations per Vishay part-number convention. AEC-Q100 qualification not specifically listed for this part; for automotive-grade equivalents consult Vishay VS-30BQ015-M3/9AT automotive-grade variants.
