P4KE350A-HF - 350V 400W TVS Diode DO-41 | Comchip Technology
N.º da peça: P4KE350A-HF ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.1564 | $0,16 |
P4KE350A-HF Visão geral
A transient voltage suppressor (TVS) is a clamping semiconductor device designed to protect sensitive circuits from voltage spikes caused by lightning, inductive load kickback, electrostatic discharge (ESD), and other transient events. Within the protection hierarchy, TVS diodes sit alongside metal-oxide varistors (MOVs) and gas discharge tubes as fast-response suppressors, with TVS diodes favored for their sub-nanosecond response time, precise clamping voltage, and repeatable performance across thousands of surge cycles.
Key specifications include a 350 V reverse standoff (Vrwm), 391 V minimum breakdown voltage, 432 V maximum breakdown voltage, and a maximum clamping voltage of 482 V at 830 mA peak pulse current (Ipp). The 400 W peak pulse power (Pppm) capability is rated for a 10/1000 µs waveform per the industry-standard TVS test protocol. Low reverse leakage below 1 µA above 10 V and a sub-nanosecond response time minimize quiescent loss and ensure effective suppression of fast transients.
The DO-41 package uses a glass-passivated silicon die bonded between axial leads, providing high mechanical robustness and excellent thermal conductivity through the leads for heat dissipation during surge events. The unidirectional polarity (denoted by the "A" suffix) clamps positive transients to ground reference. Axial-lead construction supports easy through-hole PCB assembly and repairability, which is preferred in industrial and telecom protection circuits.
Typical applications include 230 V AC mains protection at the secondary side of isolation transformers, industrial 24 V and 48 V DC bus transient suppression, telecommunications line protection, and protection for IGBT/MOSFET gate drivers and motor control circuits. Designers select the P4KE350A-HF when their working rail is at or below 350 V and the anticipated transients could otherwise exceed the breakdown rating of downstream semiconductors.
When designing, ensure the selected TVS standoff voltage is at least 10-20% above the nominal operating rail to avoid leakage during normal operation. Place the TVS as close as possible to the connector or transient entry point, with short, wide traces to minimize parasitic inductance that can elevate the effective clamping voltage.
This page synthesizes distributor pricing, parametric alternatives, and practical design notes not found in the manufacturer datasheet alone, providing engineers with actionable information for component selection and PCB layout optimization.
Alternativas drop-in para P4KE350A-HF — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
P4KE350A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
P4KE350A-TP-HF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
P4KE350A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
P4KE350A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
P4KE350A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
P4KE350A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
P4KE350A-HF Classificações máximas e características elétricas
| Manufacturer | Comchip Technology |
| Series | P4KE |
| Product Type | Transient Voltage Suppressor (TVS) Diode |
| Polarity | Unidirectional |
| Reverse Standoff Voltage (Vrwm) | 350 V |
| Breakdown Voltage (Vbr) Min | 391 V |
| Breakdown Voltage (Vbr) Max | 432 V |
| Clamping Voltage (Vc) Max | 482 V at 830 mA Ipp |
| Peak Pulse Current (Ipp) | 830 mA |
| Peak Pulse Power (Pppm) | 400 W (10/1000 µs) |
| Encapsulamento | DO-204AL (DO-41) axial lead |
| Tipo de montagem | Through Hole |
| Halogen-Free (HF) | Yes (per "-HF" suffix) |
| Status RoHS | Compliant |
| Lead-Free | Yes |
Configuração de pinos do P4KE350A-HF
| Pino 1 | Anode — Anode terminal of unidirectional TVS diode |
| Pino 2 | Cathode — Cathode terminal (marked with band); connects to protected circuit node |
Peak Pulse Power Derating vs Pulse Width
Aplicações típicas
P4KE350A-HF é adequado para 6 aplicaçãos: 230V AC Mains Secondary Protection, Industrial 24V/48V DC Bus Transient Suppression, Telecommunications Line Protection, IGBT/MOSFET Gate Driver Protection, Solar Inverter DC Input Protection, Automotive 48V Mild-Hybrid Bus Protection.
230V AC Mains Secondary Protection
The P4KE350A-HF's 350 V reverse standoff and 482 V clamping voltage make it ideal for protecting the secondary side of 230 V AC isolation transformers. Three-phase 400 V rectified DC busses (peak ~565 V) require TVS protection above the rectified rail. Placing the P4KE350A-HF across the DC bus ensures transients from inductive load switching are limited to 482 V. Its 400 W peak pulse power and sub-picosecond response handle the fast edge rates of modern IGBT switching. Use a 1.5KE series TVS (1500 W) for higher-energy transients or parallel multiple P4KE devices for additive surge capability.
Recomendado
Industrial 24V/48V DC Bus Transient Suppression
Although the P4KE350A-HF's 350 V standoff is over-spec for 24 V and 48 V industrial rails, it is used to protect downstream IGBT gate drivers and motor control circuits from high-voltage transients on the AC mains side of the system. In motor control inverters, the P4KE350A-HF placed across the 400 V rectified bus absorbs regenerative braking energy spikes. Its 830 mA Ipp rating combined with 400 W Pppm provides sufficient margin for industrial-grade surge events. Designers often parallel the P4KE350A-HF with a smaller TVS (such as SMAJ series) for two-stage protection.
Recomendado
Telecommunications Line Protection
Telecom systems often carry elevated DC voltages (130 V to 320 V nominal) for long-line powering, where the P4KE350A-HF's 350 V standoff and 482 V clamp provide effective protection for line cards and SLIC (subscriber line interface circuit) devices. The device's glass-passivated junction and DO-41 axial package provide the long-term reliability required for 10+ year service in central office equipment. Low reverse leakage below 1 µA above 10 V minimizes quiescent current draw from the central office battery plant. The halogen-free -HF variant is preferred for telecom equipment complying with modern environmental directives.
Recomendado
IGBT/MOSFET Gate Driver Protection
In high-voltage motor drives and switch-mode power supplies, the P4KE350A-HF protects gate driver ICs and IGBT modules from overvoltage transients on the high-side floating supply rail. Place the device between the gate driver's boost diode output and ground reference. The 350 V standoff safely accommodates 400 V rectified bus voltages while the 482 V clamp prevents avalanche breakdown of the gate driver's high-side transistor. The DO-41 axial package allows easy through-hole mounting adjacent to the gate driver, with the package direction (cathode band) clearly indicating unidirectional polarity.
Recomendado
Solar Inverter DC Input Protection
Photovoltaic solar systems use string voltages up to 600 V or 1000 V DC, where the P4KE350A-HF protects inverter input stages from lightning-induced surges on DC cabling. Its 350 V standoff covers 600 V system string voltages when multiple TVS are stacked, or it can be used in single-device configuration for lower-voltage PV strings. The 400 W peak pulse power handles the energy content of typical indirect lightning strikes per IEC 61000-4-5. For higher surge category D protection, consider the 1500 W 1.5KE series in parallel with the P4KE350A-HF for staged protection.
Recomendado
Automotive 48V Mild-Hybrid Bus Protection
Although not AEC-Q101 qualified, the P4KE350A-HF is used in non-safety-critical 48 V mild-hybrid automotive systems for protecting 48 V DC bus electronics. Its 350 V standoff far exceeds the 48 V nominal rail, making it suitable for protecting against load dump and jump-start transients up to ~200 V. For safety-critical automotive applications requiring AEC-Q101, select the SMAJ/HSP4KE series from Littelfuse or ON Semiconductor. The DO-41 axial package supports through-hole PCB assembly common in 48 V DC-DC converters.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para P4KE350A-HF — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | P4KE350A (Comchip) | P4KE350A-TP-HF | P4KE350A (Littelfuse) | P4KE350A (Vishay) |
|---|---|---|---|---|---|
| Package | DO-204AL (DO-41) | DO-204AL (DO-41) - same | DO-204AL (DO-41) - same | DO-204AL (DO-41) - same | DO-204AL (DO-41) - same |
| Brand | Comchip Technology | Comchip Technology | Micro Commercial Components | Littelfuse | Vishay |
| Reverse Standoff Voltage (Vrwm) | 350 V | 350 V | 350 V | 350 V | 350 V |
| Breakdown Voltage (Vbr) Min | 391 V | 391 V | 391 V | 391 V | 391 V |
| Peak Pulse Power (Pppm) | 400 W (10/1000 µs) | 400 W | 400 W | 400 W | 400 W |
| Halogen-Free | Yes (-HF suffix) | No | Yes | Yes (per P4KE datasheet) | Varies by part number |
| Polarity | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional |
| Approx. Unit Price (1000 pcs) | $0.15-0.21 | Lower (no HF surcharge) | Similar range | $0.20-0.30 | $0.25-0.40 |
Principais diferenciais
- Halogen-free molding compound with identical electrical specs (vs P4KE350A (Comchip base, non-HF))
- Multi-source drop-in availability across 5+ manufacturers (vs Single-source proprietary TVS parts)
- Higher peak pulse current than 1.5KE-series at same voltage (vs P4KE350CA bidirectional variant)
Notas de projeto
Selecting a TVS with reverse standoff voltage (Vrwm) too close to the operating rail causes continuous leakage current and accelerated aging. For a 350 V rail, choose at least 10-20% headroom. The P4KE350A-HF's 350 V Vrwm is ideal for 280-320 V nominal rails; for a true 350 V rail, step up to the P4KE400A (400 V Vrwm). Exceeding the maximum clamping voltage (482 V for P4KE350A-HF) can still damage sensitive downstream components.
Place the P4KE350A-HF as physically close as possible to the connector or transient entry point on the PCB. Use short, wide PCB traces (preferably 0.5 mm width minimum per ampere of peak surge current) to minimize parasitic inductance. Long traces add inductance that can elevate the effective clamping voltage by 50-100 V during fast-edge transients, potentially defeating the TVS protection. Place the TVS before any series ferrite or PTC components to maximize protection effectiveness.
Although the DO-41 package is small, the P4KE350A-HF's 400 W peak pulse power is rated for a 10/1000 µs waveform, which is a very short-duration event. The thermal mass of the DO-41 body and leads can absorb this energy without active cooling. However, for repetitive surge events (multiple transients per second), ensure cumulative heating does not exceed 175°C junction temperature. Derate peak pulse power linearly from 100% at 25°C ambient to 0% at 175°C junction temperature.
When designing protection for high-energy transients, consider paralleling multiple P4KE350A-HF devices for additive peak pulse current capability. Two parallel TVS diodes can deliver 1600 W instead of 400 W, useful for direct lightning strike protection per IEC 61000-4-5. However, parallel TVS diodes require matched breakdown voltage (within 5%) to ensure balanced current sharing. For higher single-device ratings, consider the 1.5KE350A (1500 W) or 5.0KE350A (5000 W) series in the same DO-201/R-6 package.
For high-frequency signal-line protection (USB, Ethernet, RF), the DO-41 package's parasitic capacitance (typically 200-500 pF) may be too high, causing signal integrity issues above 10 MHz. For high-speed signal protection, select a TVS array with sub-pF capacitance such as the USBLC6 or ESD5V0S1B-N from Nexperia. The P4KE350A-HF is appropriate for power-rail transients where capacitance is not a concern.
Informações de conformidade
RoHS and REACH compliant per Comchip product page. Halogen-free per IEC 61249-2-21 (denoted by -HF suffix). Not AEC-Q100 qualified; for automotive applications use SMAJ/HSP4KE series from qualified suppliers. Lead-free terminal finish (Pb-free) per RoHS exemption for high-melting-point solders.
