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Vishay General Semiconductor - Diodes Division P4SMA20AHM3/H
- Part No.:
- P4SMA20AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA20AHM3/H.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA20AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 20 V standoff voltage (VWM), 21.0 V maximum breakdown voltage (VBR), 27.7 V clamping voltage at 14.4 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the P4SMA20AHM3/H datasheet, P4SMA20AHM3/H pinout, P4SMA20AHM3/H application, or P4SMA20AHM3/H equivalent, key selection criteria include clamping performance under 10/1000 µs surge, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
The P4SMA20AHM3/H operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold (19.0–21.0 V at 1 mA test current). Its glass-passivated junction ensures stable leakage (<1 µA at 17.1 V) and fast response time (<1 ns), enabling protection against ESD and inductive switching spikes.
Rated for 400 W peak pulse power (derated to 300 W above 91 V), it delivers 14.4 A peak pulse current (IPPM) at 27.7 V clamping voltage under 10/1000 µs waveform, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead) - optimized for operation up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 17.1 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe operating margin below clamping onset. |
| VBR (Breakdown Voltage) | 19.0–21.0 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on during transient events. |
| VC (Clamping Voltage) | 27.7 V at 14.4 A IPPM - Maximum voltage seen by protected circuit during 10/1000 µs surge; critical for IC-level overvoltage margining. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability under standardized 10/1000 µs waveform; validates robustness against common surge threats. |
| ID (Reverse Leakage) | <1 µA at 17.1 V - Minimal standby current; preserves low-power system integrity and avoids false triggering. |
| TJ max. | +150 °C - Maximum allowable junction temperature; supports deployment in under-hood automotive and high-ambient industrial environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability per stress-test requirements including HTOL, TCT, and ESD; suffix HM3 denotes halogen-free RoHS-compliant AEC-Q101 version. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; meets UL 94 V-0 flammability rating and MSL level 1 (reflow peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / cathode-referenced reference node | Connected to ground or lower-potential rail in unidirectional configuration; enables reverse-biased clamping action. |
| Cathode | Protected line connection / transient input node | Marked with band; connects to line requiring protection (e.g., 24 V supply rail or sensor output); conducts surge current to ground during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables reliable suppression of IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) without degradation in standard PCB layout. |
| AEC-Q101 qualified (HM3 suffix) | Validates long-term reliability in automotive powertrain and body electronics where failure modes must meet stringent zero-defect expectations. |
| Glass passivated junction | Ensures stable VBR tolerance (±5%) and low leakage across temperature (-65 to +150 °C), critical for precision sensor front-ends. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response), preserving timing-critical logic and analog circuits. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and single-reflow processing without baking, simplifying high-volume SMT manufacturing. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 24 V CAN bus power rails and microcontroller GPIOs from load-dump and inductive kickback in vehicle door modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 24 V supply and ground, triggered only during reverse overvoltage events. Use Value: Limits transient voltage to ≤27.7 V during 14.4 A surge, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic. |
Use Scenario: Safeguarding 24 V digital input channels of programmable logic controllers against field-wiring faults and relay coil flyback. IC Role / Device Role / Timing Role: Standoff device mounted directly at connector entry point, absorbing repetitive 400 W pulses without derating. Use Value: Maintains <1 µA leakage at 17.1 V, ensuring clean logic thresholds and eliminating false triggering in high-noise factory environments. |
| Consumer Appliance Motor Driver Board | Telecom Base Station Sensor Interface |
Use Scenario: Shielding H-bridge gate drivers and current-sense amplifiers from back-EMF spikes generated by brushed DC motors in washing machines. IC Role / Device Role / Timing Role: Fast-response clamping element placed across motor supply terminals, activated within nanoseconds of voltage rise. Use Value: Delivers 27.7 V clamping at 14.4 A, keeping gate-source voltage within MOSFET safe operating area during commutation. |
Use Scenario: Protecting RS-485 transceiver inputs and environmental sensor analog outputs from lightning-induced surges in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Primary overvoltage barrier on differential signal lines, coordinated with secondary GDT or MOV stages. Use Value: Provides precise 19.0–21.0 V breakdown window, enabling staged protection architecture with minimal voltage headroom loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Same VWM (17.1 V), identical SMA package, but rated for 400 W with 8.3 ms half-sine surge (not 10/1000 µs); higher VF (3.5 V @ 25 A). | Limited to unidirectional AC-line or motor-drive surge scenarios; not AEC-Q101 qualified. | Select when cost-sensitive industrial designs require legacy footprint compatibility and do not demand automotive qualification. |
| 1.5SMC20A | Higher package thermal resistance (RθJA = 150 °C/W vs. 120 °C/W); same VWM/VBR/VC specs; larger SMC (DO-214AB) footprint. | Requires PCB redesign due to 7.11 mm × 6.22 mm body vs. SMA's 4.50 mm × 3.99 mm; better for high-energy, low-frequency surges. | Choose when board space permits larger package and system-level testing confirms superior thermal margin under sustained duty cycles. |
Compared with SMAJ20A and 1.5SMC20A, the P4SMA20AHM3/H offers AEC-Q101 qualification, lower thermal resistance, and tighter VBR tolerance - making it optimal for space-constrained, high-reliability automotive and industrial edge nodes where validated lifetime performance is mandatory.
Availability
P4SMA20AHM3/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and consumer appliance motor control requiring stable component supply with full traceability and lifecycle continuity.
Supply support for P4SMA20AHM3/H 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The P4SMA Series targets cost-effective, high-volume transient suppression in space-constrained SMT applications - engineered specifically for AEC-Q101 compliance, automated assembly, and robust clamping performance across extended temperature ranges.
FAQ
What is the clamping voltage of the P4SMA20AHM3/H under a 10/1000 µs surge?
The P4SMA20AHM3/H has a maximum clamping voltage (VC) of 27.7 V at 14.4 A peak pulse current under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88367 and represents the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the P4SMA20AHM3/H qualified for automotive applications?
Yes, the P4SMA20AHM3/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade reliability validation. It undergoes stress testing including high-temperature operating life (HTOL), temperature cycling (TCT), and ESD per AEC-Q101 Rev D, making it suitable for under-hood and body electronics where zero-defect operation is required.
What does the "HM3" suffix indicate in P4SMA20AHM3/H?
The "HM3" suffix in P4SMA20AHM3/H specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification, while "/H" denotes packaging in 7-inch tape-and-reel format (1800 units per reel). This distinguishes it from commercial-grade "E3" or "M3" variants and confirms compliance with automotive material and reliability standards per Vishay's ordering information table.
Can the P4SMA20AHM3/H be used in bidirectional configurations?
No, the P4SMA20AHM3/H is a unidirectional TVS diode, as indicated by the absence of "CA" in its part number and its cathode-band marking. Bidirectional operation requires CA-suffixed variants like P4SMA20CA; using P4SMA20AHM3/H in AC-coupled or symmetrical signal lines would result in forward conduction and potential failure during negative transients.
What is the thermal resistance of the P4SMA20AHM3/H, and how does it affect PCB layout?
The P4SMA20AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. To maintain safe junction temperatures under 400 W peak pulses, PCB layout must use minimum recommended copper pad areas (0.2" × 0.2" per terminal) - undersized pads increase RθJA, risking thermal runaway during repetitive surges.
P4SMA20AHM3/H 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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 14.4A
- 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)
P4SMA20AHM3/H FAQ
1.How can I place an order for P4SMA20AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA20AHM3/H 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 P4SMA20AHM3/H reliable?
The price and inventory of P4SMA20AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA20AHM3/H is usually 5 days.
3.What payment methods are accepted for P4SMA20AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA20AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA20AHM3/H?
P4SMA20AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA20AHM3/H 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 P4SMA20AHM3/H?
For technical support, including P4SMA20AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA20AHM3/H requirements.
6.How does Aetrix verify that P4SMA20AHM3/H is sourced from the original manufacturer or authorized distributors?
All P4SMA20AHM3/H 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 P4SMA20AHM3/H meets industry standards.
7.What is the process for return or replacement of P4SMA20AHM3/H?
All P4SMA20AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA20AHM3/H, 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 P4SMA20AHM3/H part is unused and in its original packaging.
Return procedure for P4SMA20AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA20AHM3/H Tags
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