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Vishay General Semiconductor - Diodes Division P4SMA120AHM3_A/I
- Part No.:
- P4SMA120AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA120AHM3_A/I.pdf
- Description:
- TVS DIODE 102VWM 165VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA120AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMA (DO-214AC) package, rated for 120 V standoff voltage (VWM), 114–126 V breakdown voltage (VBR) at 1 mA, and 165 V clamping voltage (VC) at 1.8 A peak pulse current (IPPM), designed to protect MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning surges in industrial and automotive electronics.
For engineers reviewing the P4SMA120AHM3_A/I datasheet, P4SMA120AHM3_A/I pinout, P4SMA120AHM3_A/I application, or P4SMA120AHM3_A/I equivalent, this device offers AEC-Q101 qualification, 400 W peak pulse power (10/1000 µs), low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for high-reliability automotive and embedded power rail protection.
Technical Context
The P4SMA120AHM3_A/I operates as a unidirectional avalanche diode with glass-passivated junction, delivering fast response time (<1 ns) and stable clamping under repetitive 10/1000 µs transients. Its thermal resistance (RθJA = 120 °C/W) and junction temperature range (–65 °C to +150 °C) support operation on standard 0.2" × 0.2" copper pads without forced cooling.
It features a cathode-band polarity marking, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets UL 94 V-0 flammability rating. The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101-qualified construction for automotive-grade deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 102 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 120 V nominal rails. |
| VBR (Breakdown Voltage) | 114–126 V at 1 mA - Tight 10% tolerance ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 165 V at IPPM = 1.8 A - Limits transient voltage seen by downstream circuitry during 10/1000 µs surge. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 µs) - Sustains high-energy transients common in automotive load-dump and inductive switch-off scenarios. |
| ID (Reverse Leakage) | 1.0 µA at VWM - Minimal leakage preserves power efficiency and avoids false triggering in low-current sensor interfaces. |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and thermally constrained industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount footprint compatible with automated placement and reflow processes. |
Pinout & Package
Package: SMA (DO-214AC), 2-terminal surface-mount case with cathode band marking; dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); UL 94 V-0 molding compound; matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal (reverse-biased mode) | Connected to protected line (e.g., power rail or signal); forms cathode-to-anode path during clamping. |
| Cathode | Current exit terminal (reverse-biased mode) | Marked with band; tied to ground or lower-potential reference; defines unidirectional conduction direction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces under temperature cycling, humidity, and mechanical stress. |
| 400 W peak pulse power (10/1000 µs) | Handles high-energy transients from relay coil de-energization or alternator load dump without degradation. |
| Glass-passivated junction | Ensures long-term stability of VBR and low leakage across temperature and lifetime, critical for safety-critical systems. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without pre-baking, reducing manufacturing complexity and cost. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental compliance requirements for automotive OEMs and industrial equipment manufacturers. |
Applications
| Automotive Engine Control Unit (ECU) Power Input Protection | Industrial PLC Digital I/O Signal Line Protection |
|---|---|
Use Scenario: Protects 12 V supply rail of ECU against load-dump transients up to 40 V above nominal and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC/DC converter input stage. Use Value: Clamps transients to ≤165 V within nanoseconds, preventing damage to upstream regulators and microcontrollers. |
Use Scenario: Shields 24 V digital input channels in programmable logic controllers from field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Standoff-rated TVS on each isolated input channel, referenced to system ground. Use Value: Maintains <1 µA leakage at 24 V, avoiding false logic states while surviving repeated 1 kV/500 A surge events. |
| Telecom Base Station Sensor Interface Protection | Consumer Appliance Motor Drive Board Protection |
Use Scenario: Safeguards analog sensor signals (e.g., temperature, pressure) in outdoor telecom cabinets exposed to lightning-induced coupling. IC Role / Device Role / Timing Role: Low-capacitance TVS on differential sensor lines, mounted close to connector entry point. Use Value: 165 V clamping prevents latch-up or burnout of precision op-amps and ADC front-ends during fast-rising transients. |
Use Scenario: Guards gate driver supply rails in washing machine motor inverters against back-EMF spikes from brushless DC motor commutation. IC Role / Device Role / Timing Role: Unidirectional TVS on 15 V auxiliary rail feeding half-bridge gate drivers. Use Value: 400 W pulse rating absorbs repetitive 10/1000 µs energy without derating, extending board lifetime in high-cycle applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-E3/5A | Same VWM (102 V), VC = 165 V, but rated for 400 W at 25 °C only; no AEC-Q101 qualification; commercial-grade M3 suffix. | Lacks automotive qualification and halogen-free certification; suitable for industrial/commercial designs without automotive compliance needs. | Select when AEC-Q101 is not required and cost optimization is prioritized over automotive traceability. |
| 1.5SMC120AHE3_A | Higher package (SMC/DO-214AB), 1.5 kW peak power, same VWM/VC; AEC-Q101 qualified; larger footprint (7.11 mm × 6.22 mm). | Offers higher surge robustness but requires PCB layout change; used where >400 W pulse handling is mandated (e.g., heavy-duty industrial drives). | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and SMA footprint is insufficient. |
Compared with SMAJ120A-E3/5A, P4SMA120AHM3_A/I delivers automotive-grade reliability and halogen-free compliance in the same SMA footprint; versus 1.5SMC120AHE3_A, it trades peak power headroom for space-constrained layouts in compact ECUs and sensor modules.
Availability
P4SMA120AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial PLC I/O conditioning, and telecom sensor interface hardening requiring stable component supply, full traceability, and AEC-Q101 compliance.
Supply support for P4SMA120AHM3_A/I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The P4SMA Series targets cost-sensitive yet reliability-critical transient suppression in automotive, industrial, and telecom infrastructure - delivering standardized TVS performance in compact SMA packages with AEC-Q101 options.
FAQ
What is the clamping voltage of P4SMA120AHM3_A/I at its rated peak pulse current?
The P4SMA120AHM3_A/I has a maximum clamping voltage (VC) of 165 V at 1.8 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88367 and defines the upper voltage limit imposed on protected circuitry during surge events. The P4SMA120AHM3_A/I maintains this clamping performance across its specified operating temperature range and after multiple surge cycles when mounted per recommended pad layout.
Is P4SMA120AHM3_A/I suitable for automotive applications?
Yes, P4SMA120AHM3_A/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It supports operating junction temperatures from –65 °C to +150 °C and passes stress tests including temperature cycling, humidity bias, and mechanical shock per AEC-Q101. The P4SMA120AHM3_A/I is commonly deployed in engine control units, body control modules, and ADAS sensor interfaces where transient immunity and long-term reliability are mandatory.
What does the "HM3_A/I" suffix mean in P4SMA120AHM3_A/I?
In P4SMA120AHM3_A/I, "HM3" denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction; "A" indicates the revision level per Vishay's internal documentation; "I" specifies packaging in 13-inch diameter plastic tape and reel with 7500 units per reel. This ordering code ensures full compliance traceability and matches the delivery format required for high-volume SMT assembly lines serving automotive Tier 1 suppliers.
How does P4SMA120AHM3_A/I compare to bidirectional TVS diodes like P4SMA120CA?
P4SMA120AHM3_A/I is unidirectional and intended for DC rail protection where polarity is fixed (e.g., 12 V battery inputs), offering lower leakage (<1 µA) and tighter VBR tolerance than its bidirectional counterpart P4SMA120CA. The P4SMA120CA supports AC or floating signal lines but exhibits higher reverse leakage and symmetric clamping in both directions. Selection depends on circuit topology: use P4SMA120AHM3_A/I for polarized supplies; choose P4SMA120CA only when bidirectional surge protection is required.
What is the thermal resistance of P4SMA120AHM3_A/I, and how does it affect layout design?
The P4SMA120AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes no additional heatsinking and defines the temperature rise under steady-state power dissipation. For reliable operation at full 3.3 W power rating, PCB layout must provide adequate copper area and avoid thermal isolation; the P4SMA120AHM3_A/I is not intended for continuous high-power dissipation but for transient-only duty cycles.
P4SMA120AHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 102V
- Voltage - Breakdown (Min):
- 114V
- Voltage - Clamping (Max) @ Ipp:
- 165V
- Current - Peak Pulse (10/1000µs):
- 1.8A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA120AHM3_A/I FAQ
1.How can I place an order for P4SMA120AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA120AHM3_A/I on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for P4SMA120AHM3_A/I reliable?
The price and inventory of P4SMA120AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA120AHM3_A/I is usually 5 days.
3.What payment methods are accepted for P4SMA120AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA120AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA120AHM3_A/I?
P4SMA120AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA120AHM3_A/I order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for P4SMA120AHM3_A/I?
For technical support, including P4SMA120AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA120AHM3_A/I requirements.
6.How does Aetrix verify that P4SMA120AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All P4SMA120AHM3_A/I products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that P4SMA120AHM3_A/I meets industry standards.
7.What is the process for return or replacement of P4SMA120AHM3_A/I?
All P4SMA120AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA120AHM3_A/I, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The P4SMA120AHM3_A/I part is unused and in its original packaging.
Return procedure for P4SMA120AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA120AHM3_A/I Tags
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