PMEG4030ER/8X - 40V 3A Schottky Rectifier SOD-123W | Nexperia
N.º de pieza: PMEG4030ER/8X ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0.42 | $0,42 |
| 10 | $0.36 | $3,60 |
| 100 | $0.27 | $27,00 |
| 500 | $0.21 | $105,00 |
| 1.000 | $0.17 | $170,00 |
| 3.000 | $0.13 | $390,00 |
PMEG4030ER/8X Descripción general
A Schottky barrier 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 to 0.5 V) and faster switching than conventional rectifiers. It belongs to the discrete semiconductor hierarchy: rectifier diode -> diode -> discrete semiconductor -> electronic component. Because Schottky rectifiers have no reverse recovery charge, they are preferred in switch-mode power supplies, low-voltage synchronous-rectification stages, and reverse-polarity protection where switching losses dominate. The trade-off is higher reverse leakage current and a lower maximum reverse voltage compared to PN-junction rectifiers.
The PMEG4030ER/8X offers a typical forward voltage of approximately 540 mV at the rated current, low reverse leakage, and a non-repetitive peak forward surge current rating that supports hot-plug and load-dump events. The SOD-123W package provides a low thermal resistance path through its flat leads, and the small footprint allows designers to replace part packs to shrink board area in space-constrained portable and USB-PD designs.
Internally, the device uses Nexperia's planar Schottky technology with a guard ring that suppresses edge breakdown under reverse bias. This construction improves long-term reliability under thermal cycling and reduces leakage drift compared with older mesa-type Schottky rectifiers. The part is qualified to -40 °C to +150 °C operating junction temperature and supports lead-free reflow profiles to 260 °C.
Typical applications include step-down and step-up converter output rectification, freewheeling diodes for buck/boost inductors, USB Type-C and battery-charger polarity protection, low-voltage OR-ing between power sources, and DC motor freewheeling. Its 40 V rating covers 12 V and 24 V rail environments with adequate transient headroom.
When designing with this part, ensure that the steady-state junction temperature stays below 125 °C (or per derating curve). For continuous 3 A operation, copper pad area under the cathode lead should be maximized; even the SOD-123W package can dissipate the resulting heat if the PCB thermal path is well designed.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on a single manufacturer datasheet, helping engineers select and source the right part for high-efficiency rectification.
Alternativas directas para PMEG4030ER/8X — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con PMEG4030ER/8X (mismo factor de forma y huella) — difiere en Package.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PMEG4030EP,115
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PMEG3020ER,115
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PMEG2020ER,115
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MBRA340T3G
✅ Sustitución directa✓ En stock
$0.12 / unidad
Ver hoja de datos →SS34-E3/57T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PMEG4030ER/8X Valores máximos y características eléctricas
| Manufacturer | Nexperia |
| Diode Type | Schottky Barrier Rectifier |
| Repetitive Peak Reverse Voltage (VRRM) | 40 V |
| Average Forward Current (IF(AV)) | 3 A |
| Forward Voltage (VF) at IF | 540 mV (typical at 3 A) |
| Temperatura de unión de funcionamiento | -40 °C to +150 °C |
| Encapsulado | SOD-123W (CFP3) |
| Tipo de montaje | Surface Mount |
| Recuento de pines | 2 |
| Lead Finish | Matte Tin (lead-free) |
| Nivel MSL | 1 (per JEDEC J-STD-020) |
| Reflow Profile | Lead-free up to 260 °C peak |
| Estado RoHS | Compliant |
| REACH Status | Compliant |
Configuración de pines de PMEG4030ER/8X
| Pin 1 | Anode — Positive terminal of the Schottky rectifier (forward current enters here) |
| Pin 2 | Cathode — Negative terminal of the Schottky rectifier (forward current exits here; marked with a band on the top of the device) |
Aplicaciones típicas
PMEG4030ER/8X es adecuado para 7 aplicacións: 12 V Buck Converter Output Rectifier, Reverse-Polarity Protection on USB Type-C VBUS, Freewheeling Diode in DC Motor Drive, Battery Charger Reverse-Blocking Stage, Low-Voltage OR-ing Between Power Sources, Step-Up (Boost) Converter Switching Rectifier, Industrial 24 V Sensor Protection.
12 V Buck Converter Output Rectifier
The PMEG4030ER/8X is well matched to the output rectifier position in a 12 V to 5 V or 12 V to 3.3 V buck converter carrying up to 3 A. Its 540 mV typical forward voltage at full load adds only ~1.6 W conduction loss, while the 40 V VRRM provides more than 3x safety margin above the 12 V input. Versus a Schottky part with 700 mV VF, efficiency improves by 2 to 4 percentage points at full load. Recommend PCB layout with cathode pad connected to a copper pour of at least 100 mm² to keep junction temperature below 100 °C at 3 A continuous.
Recomendado
Reverse-Polarity Protection on USB Type-C VBUS
USB Type-C VBUS can reach 20 V at 5 A. The PMEG4030ER/8X blocks reverse-polarity transients up to 40 V and carries up to 3 A forward current, exceeding the 5 V/3 A default USB-C current requirement with margin. Inserted in series with VBUS (cathode toward the load), the 540 mV VF adds only 1.6 W loss at 3 A, negligible compared to the 15 W Type-C budget. Compared to a P-MOSFET solution (typical Rds(on) 30 mΩ at 5 V/3 A = 0.27 W), the Schottky is simpler and cheaper, but the MOSFET wins on conduction loss above 1 A continuous.
Recomendado
Freewheeling Diode in DC Motor Drive
In brushed DC motor or relay driver circuits, the PMEG4030ER/8X acts as a freewheeling diode across the inductive load, absorbing the back-EMF when the switch turns off. Its 3 A continuous rating covers small motors up to ~30 W, and the 40 V VRRM easily clamps the inductive spike from a 12 V or 24 V motor. The Schottky's lack of reverse recovery charge prevents the shoot-through spikes that slow-recovery PN diodes generate, improving switching-edge cleanliness. Pair with a logic-level MOSFET or BJT driver such as the NDT456P for a complete half-bridge.
Recomendado
Battery Charger Reverse-Blocking Stage
In a single-cell Li-ion or multi-cell NiMH charger, the PMEG4030ER/8X prevents battery current from flowing back into the adapter when the source is disconnected, replacing a discrete P-FET solution at lower BOM cost. The 40 V VRRM comfortably exceeds any USB-PD profile (5 V to 20 V), and the 3 A rating handles 15 W charging. The diode's low forward drop improves charging efficiency by 1 to 2% versus a Schottky with 600 mV+ VF, directly extending battery runtime per charge cycle.
Recomendado
Low-Voltage OR-ing Between Power Sources
Two power sources - e.g. USB VBUS and a wall adapter - can be diode-ORed to the load using a pair of PMEG4030ER/8X rectifiers, with the higher-voltage source naturally winning. The 540 mV typical VF means the load sees at most 540 mV below the active source, acceptable for 5 V rails but marginal for 3.3 V systems. Compared to a MOSFET-based ideal-diode OR-ing circuit, this diode-OR is simpler and cheaper but loses more power; pick this topology only when efficiency is not the top constraint.
Recomendado
Step-Up (Boost) Converter Switching Rectifier
In a boost converter that steps 5 V up to 12 V or higher, the PMEG4030ER/8X serves as the switching rectifier at the inductor/load node. Its 40 V rating supports output rails up to ~30 V with safety margin, and the 3 A continuous rating covers boost converters up to ~15 W output. The lack of reverse recovery charge is critical at high switching frequencies (500 kHz+) because reverse-recovery losses would otherwise dominate efficiency. Pair with a PWM controller such as the NCP3063B for a complete boost solution.
Recomendado
Industrial 24 V Sensor Protection
Industrial 24 V sensor and actuator lines are exposed to transient reverse polarity and load-dump events. The PMEG4030ER/8X provides input-side reverse-polarity protection with 40 V VRRM, which exceeds the worst-case 24 V load-dump spike (~36 V) on trucks and industrial machinery. The 3 A rating handles sensor supply currents up to 3 A with low dissipation. Place it at the cable-entry point of the sensor board, before any fuse or TVS, to protect downstream components from miswired field installations.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PMEG4030ER/8X — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PMEG4030EP,115 | PMEG3020ER,115 | PMEG2020ER,115 | MBRA340T3G | SS34-E3/57T |
|---|---|---|---|---|---|---|
| Package | SOD-123W (CFP3) | SOD-123W (CFP3) - same | SOD-123W (CFP3) - same | SOD-123W (CFP3) - same | SMA - same | SMA - same |
| Brand | Nexperia | Nexperia - same | Nexperia - same | Nexperia - same | onsemi - cross-brand | Vishay - cross-brand |
| Repetitive Peak Reverse Voltage (VRRM) | 40 V | 40 V | 30 V | 20 V | 40 V | 40 V |
| Average Forward Current (IF(AV)) | 3 A | 3 A | 3 A | 2 A | 3 A | 3 A |
| Forward Voltage (VF) at 3 A (typ) | 540 mV | ~600 mV (estimated) | ~450 mV (estimated, lower VR) | ~390 mV (estimated, lower VR) | ~450 mV | ~500 mV |
| Diode Configuration | Single | Single | Single | Single | Single | Single |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS / Lead-Free | Yes | Yes | Yes | Yes | Yes | Yes |
Diferenciadores clave
- Lowest VF in SOD-123W at 3 A for 40 V class (frente a MBRA340T3G (onsemi))
- Higher current rating than 1 A-class SS14 equivalents (frente a SS14 (multiple manufacturers))
- Integrated guard ring for stress protection (frente a PMEG2020ER,115)
- True drop-in within PMEG family footprint (frente a PMEG3020ER,115 (30 V, 3 A))
Notas de diseño
Estimated: at IF=3 A continuous and VF=540 mV (typ) in the SOD-123W package, the diode dissipates about 1.62 W of heat. The SOD-123W thermal resistance is approximately 75 °C/W with the minimum recommended 100 mm² cathode copper pad on FR-4, giving a junction-temperature rise of ~120 °C above 25 °C ambient. To stay below the 150 °C maximum junction temperature, either reduce ambient temperature below ~30 °C, increase the cathode pad area to 200 mm² (theta_JA drops to ~55 °C/W), or operate below 2 A continuous.
Maximize the copper area on the cathode pad (pin 2) and connect it to a wide ground or power plane to spread heat. The anode pad (pin 1) carries only the lead's thermal path; it does not need extra copper unless the design reuses it as a thermal via field. Place the diode close to the switching source (MOSFET switch node or transformer secondary) to minimize the high-dV/dt loop area, which reduces radiated EMI and prevents the diode from injecting ringing into the converter output.
Do not exceed the 40 V VRRM in transient spikes - in 24 V industrial environments, inductive kickback can momentarily exceed 40 V if no TVS or snubber is present. Also, the 3 A rating is the average forward current at 25 °C case and must be derated linearly to 0 A at 150 °C junction. Avoid paralleling multiple PMEG4030ER/8X units without ballast resistors or matched devices, because Schottky forward-voltage tolerance (~±50 mV at 3 A) can cause one device to hog current and overheat.
Use the IPC-7351 SOD-123W land pattern: a 1.6 mm × 0.9 mm cathode pad and a 0.9 mm × 0.9 mm anode pad with the standard 0.5 mm pitch. Solder paste should be SAC305 lead-free with a stencil thickness of 0.12 to 0.15 mm. Reflow to the JEDEC J-STD-020 lead-free profile with peak temperature ≤ 260 °C for ≤ 30 s above 255 °C. Hand-soldering should use a 320 °C iron for no more than 5 s per lead to avoid damaging the plastic body.
Información de cumplimiento
RoHS and REACH compliance per Nexperia product page; lead-free matte-tin finish; MSL 1 per JEDEC J-STD-020. AEC-Q100 not applicable - this is a general-purpose discrete, not an automotive-grade IC. Halogen-free status not explicitly stated in the verified web data.
