My Inquiry
My Account
Vishay General Semiconductor - Diodes Division P4SMA20AHE3_A/I
- Part No.:
- P4SMA20AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA20AHE3_A/I.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,458
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMA20AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 20 V standoff voltage (VWM), 21.0 V maximum breakdown voltage (VBR), and 400 W peak pulse power (10/1000 μs). It provides clamping at 27.7 V under 14.4 A peak pulse current and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the P4SMA20AHE3_A/I datasheet, P4SMA20AHE3_A/I pinout, P4SMA20AHE3_A/I application, or P4SMA20AHE3_A/I equivalent, this device is selected for robust overvoltage protection of low-voltage DC rails, sensor interfaces, and power inputs in harsh environments where fast response (<1 ns), low clamping ratio, and automotive-grade reliability are required.
Technical Context
The P4SMA20AHE3_A/I operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold (19.0–21.0 V), with cathode band marking polarity. Its glass-passivated junction ensures stable leakage (<1.0 μA at 17.1 V) and repeatable clamping performance across temperature (−65 °C to +150 °C).
Designed for transient suppression per IEC 61000-4-2/4-4/4-5, it delivers 400 W peak pulse power on 0.2" × 0.2" copper pads, derating to 300 W above 91 V. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting reliable operation under repetitive surge conditions at ≤0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff Voltage) | 17.1 V - Maximum continuous reverse voltage before conduction begins; defines safe operating margin for 20 V nominal rail protection. |
| VBR (Breakdown Voltage) | 19.0–21.0 V at 1.0 mA - Tight tolerance ensures predictable turn-on; critical for precise clamping alignment with protected IC thresholds. |
| VC (Clamping Voltage) | 27.7 V at 14.4 A IPPM - Limits transient voltage seen by downstream circuitry; clamping ratio = VC/VWM ≈ 1.62. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs waveform) - Sustains high-energy transients like ISO 7637-2 pulse 1/2a without failure. |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - Minimizes standby power loss and avoids false triggering in low-current sensor lines. |
| TJ max | +150 °C - Enables use in under-hood automotive modules and industrial enclosures without thermal derating penalties. |
| AEC-Q101 Qualified | Yes - Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connects to protected line; conducts surge current to ground during overvoltage events. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy load dump and inductive switching surges common in 12 V automotive systems. |
| Fast response time (<1 ns) | Clamps transients before sensitive logic or analog circuitry sustains damage. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity stress. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT assembly processes without moisture sensitivity concerns. |
| AEC-Q101 qualification | Validated for automotive use per stress test requirements including HTOL, TC, and ESD. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and battery reversal transients in door modules and lighting controllers. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy on 12 V supply and signal lines before reaching MCU or transceiver inputs. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V logic while maintaining signal integrity during ISO 7637-2 pulses. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input cards in factory automation. IC Role / Device Role / Timing Role: Fast-clamping element placed at sensor connector entry point to shunt induced EFT bursts (IEC 61000-4-4) and ESD (IEC 61000-4-2). Use Value: Maintains measurement accuracy by limiting voltage excursion to <28 V, well below ADC input absolute maximum ratings. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feed Protection |
Use Scenario: Secondary-side overvoltage protection on 5 V/9 V USB-C PD adapter outputs against feedback loop failures or transient coupling. IC Role / Device Role / Timing Role: Standby-mode TVS absorbing short-duration surges without affecting normal regulation or efficiency. Use Value: Eliminates need for secondary crowbar circuits; clamps within 27.7 V while drawing <1 μA at nominal output. |
Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from lightning-induced surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: Primary-level unidirectional suppressor on DC input rail upstream of DC-DC converter. Use Value: Handles 400 W surges per IEEE 802.3bt requirements while fitting compact DO-214AC footprint on dense PCB layouts. |
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-E3/5A | Same VWM (17.1 V), same package, but lower PPPM (400 W vs. P4SMA20AHE3_A/I's 400 W); identical clamping (27.7 V), but higher ID (5.0 μA vs. 1.0 μA). | Not AEC-Q101 qualified; suitable for commercial/industrial use only. | Select when automotive qualification is unnecessary and cost optimization is prioritized over leakage-critical sensor nodes. |
| 1.5SMC20A | Higher package thermal resistance (RθJA = 150 °C/W vs. 120 °C/W); same VWM/VBR/VC but larger SMC (DO-214AB) footprint. | Requires more PCB area; not optimized for automated placement density. | Choose only if legacy board layout uses SMC or higher single-pulse energy (>400 W) is needed with heatsinking. |
Compared with SMAJ20A-E3/5A and 1.5SMC20A, the P4SMA20AHE3_A/I offers tighter leakage, AEC-Q101 qualification, and superior thermal performance in the smallest standard surface-mount TVS package-making it optimal for space-constrained, automotive-grade designs requiring long-term reliability.
Availability
P4SMA20AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power feed applications requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for P4SMA20AHE3_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, precision, and automotive-grade validation.
The P4SMA Series targets cost-effective, high-reliability transient suppression for automotive, industrial, and consumer electronics-designed specifically for surface-mount compatibility, automated assembly, and AEC-Q101 compliance.
FAQ
What is the maximum clamping voltage of the P4SMA20AHE3_A/I under rated surge conditions?
The P4SMA20AHE3_A/I clamps to a maximum of 27.7 V when subjected to its rated 14.4 A peak pulse current (IPPM) using the standard 10/1000 μs waveform. This value is measured at TA = 25 °C on recommended 0.2" × 0.2" copper pads and remains stable across its operating temperature range due to low temperature coefficient (0.090 %/°C).
Is the P4SMA20AHE3_A/I suitable for bidirectional transient protection?
No, the P4SMA20AHE3_A/I is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay offers the P4SMA20CA variant. Using P4SMA20AHE3_A/I in bidirectional configurations risks forward conduction during negative transients and invalidates its specified clamping performance.
Does the P4SMA20AHE3_A/I require a heatsink for standard operation?
No external heatsink is required for the P4SMA20AHE3_A/I under typical single-pulse or low-duty-cycle surge conditions. Its RθJA of 120 °C/W and RθJL of 30 °C/W allow safe operation with standard PCB copper pads (0.2" × 0.2" per terminal); however, sustained repetitive surges above 0.01% duty cycle may require additional copper area or thermal vias.
What does the "HE3_A/I" suffix in P4SMA20AHE3_A/I signify?
The "HE3" denotes RoHS-compliant and AEC-Q101 qualified construction; "A" indicates revision level per Vishay's internal documentation; "I" specifies packaging in 13" diameter tape-and-reel (7500 units/reel). This full suffix confirms automotive-grade qualification, halogen-free materials, and high-volume SMT readiness.
How does the P4SMA20AHE3_A/I compare to older P4SMA20A variants without HE3 suffix?
The P4SMA20AHE3_A/I retains identical electrical specifications (VWM, VBR, VC, PPPM) as non-HE3 versions but adds AEC-Q101 qualification, halogen-free molding compound, and enhanced process controls for automotive reliability. It also meets JESD201 Class 2 whisker resistance and MSL Level 1 reflow compatibility-features absent in base P4SMA20A-E3 parts.
P4SMA20AHE3_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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA20AHE3_A/I FAQ
1.How can I place an order for P4SMA20AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA20AHE3_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 P4SMA20AHE3_A/I reliable?
The price and inventory of P4SMA20AHE3_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 P4SMA20AHE3_A/I is usually 5 days.
3.What payment methods are accepted for P4SMA20AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA20AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA20AHE3_A/I?
P4SMA20AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA20AHE3_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 P4SMA20AHE3_A/I?
For technical support, including P4SMA20AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA20AHE3_A/I requirements.
6.How does Aetrix verify that P4SMA20AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All P4SMA20AHE3_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 P4SMA20AHE3_A/I meets industry standards.
7.What is the process for return or replacement of P4SMA20AHE3_A/I?
All P4SMA20AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA20AHE3_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 P4SMA20AHE3_A/I part is unused and in its original packaging.
Return procedure for P4SMA20AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA20AHE3_A/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
