My Inquiry
My Account
Vishay General Semiconductor - Diodes Division P4SMA18A-E3/61
- Part No.:
- P4SMA18A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA18A-E3/61.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:1,060
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMA18A-E3/61 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 15.3 V standoff voltage (VWM), 17.1–18.9 V breakdown voltage (VBR) at 1 mA, 25.2 V maximum clamping voltage (VC) at 15.9 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines in industrial and automotive electronics.
For engineers reviewing the P4SMA18A-E3/61 datasheet, P4SMA18A-E3/61 pinout, P4SMA18A-E3/61 application, or P4SMA18A-E3/61 equivalent, key selection considerations include its unidirectional polarity, 120 °C/W junction-to-ambient thermal resistance, AEC-Q101 qualification status (via HE3/HM3 variants), RoHS-compliant matte tin plating, and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
The P4SMA18A-E3/61 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold (17.1–18.9 V), with fast response time (<1 ns) and low incremental surge resistance enabling effective suppression of ESD and inductive switching transients. Its glass-passivated junction ensures stable leakage performance and long-term reliability under repetitive surge conditions.
Thermally, it uses the SMA (DO-214AC) package with RθJA = 120 °C/W and RθJL = 30 °C/W, rated for continuous power dissipation of 3.3 W at 50 °C ambient on infinite heatsink and operating junction temperature up to +150 °C. The cathode band identifies polarity, and it meets J-STD-020 MSL Level 1 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 15.3 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping onset |
| VBR (Breakdown Voltage) | 17.1–18.9 V at 1 mA - Confirmed avalanche conduction threshold; ensures predictable turn-on during transients |
| VC (Clamping Voltage) | 25.2 V at 15.9 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; limits stress on downstream components |
| PPPM (Peak Pulse Power) | 400 W - Sustains single 10/1000 µs transient without failure; derates above 25 °C per Fig. 2 |
| IPPM (Peak Pulse Current) | 15.9 A - Maximum non-repetitive surge current handled; requires proper PCB copper pad layout (0.2" × 0.2") |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments |
| Leakage Current (ID) | 1.0 µA at VWM - Minimal standby power loss and signal interference in high-impedance circuits |
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; cathode identified by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side (e.g., GND or return path); defines unidirectional conduction direction |
| Cathode | Avalanche conduction terminal / Clamping node | Connected to protected line (e.g., 12 V rail or signal trace); conducts surge current to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 12 V systems without derating |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving clamping precision for sensitive 3.3 V/5 V logic interfaces |
| Glass passivated junction | Ensures stable VBR tolerance (±5 %) and <1 µA leakage after 1000 hrs HTOL testing at 85 °C/85 % RH |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements |
| AEC-Q101 qualified option (HE3 suffix) | Validated for automotive powertrain and body electronics per stress test requirements including TCT, HTRB, and UHAST |
Applications
| Automotive Sensor Signal Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting analog output lines (e.g., 0–10 V or 4–20 mA) from load dump and inductive kickback in engine control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and ground, clamping transients before they reach ADC input or op-amp buffer. Use Value: Limits voltage excursion to ≤25.2 V during 15.9 A surges, preventing latch-up or permanent damage to 3.3 V microcontroller I/O pins. |
Use Scenario: Safeguarding digital input terminals of programmable logic controllers exposed to relay coil flyback and field wiring ESD. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V DC input lines, absorbing energy from 40 A inductive switch-offs per IEC 61000-4-4. Use Value: Maintains system uptime by preventing false triggering or reset events caused by >1 kV transients coupled via long cable runs. |
| Consumer Power Supply Rail Clamping | Telecom Line Interface Surge Suppression |
Use Scenario: Secondary-side overvoltage protection on 12 V/5 V SMPS outputs feeding USB hubs or display backlights. IC Role / Device Role / Timing Role: Fast-response TVS parallel to output capacitor, activated within nanoseconds to clamp ringing from transformer leakage inductance. Use Value: Reduces need for oversized output capacitors by limiting peak rail excursions to 25.2 V, preserving electrolytic capacitor lifetime. |
Use Scenario: Primary-level surge protection on Ethernet PHY power rails (e.g., 3.3 V bias supply) in PoE-powered access points. IC Role / Device Role / Timing Role: Unidirectional suppressor between PHY VDD and GND, shunting induced lightning surges from magnetics or chassis coupling. Use Value: Achieves IEC 61000-4-5 4 kV compliance with minimal board space due to compact SMA footprint and no external series impedance required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A (Bourns) | Same VWM/VBR/VC specs but SMB package (DO-214AA); 10% larger footprint, RθJA = 110 °C/W | Better thermal performance on dense boards; less suitable for ultra-thin consumer designs requiring lowest profile | Select SMBJ18A if board layout allows 2.5 mm height increase and higher power derating margin is needed |
| 1.5SMC18A (ON Semiconductor) | Identical electrical specs, same SMA package, but rated for 1.5 kW peak pulse power (10/1000 µs) - 3.75× higher than P4SMA18A-E3/61 | Used where legacy 1.5 kW surge standards apply (e.g., MIL-STD-1275); over-spec for most commercial IEC 61000-4-5 use cases | Choose 1.5SMC18A only when full 1.5 kW surge immunity is mandated; otherwise P4SMA18A-E3/61 offers better cost and size efficiency |
Compared with SMBJ18A and 1.5SMC18A, the P4SMA18A-E3/61 delivers optimal balance of compact SMA footprint, AEC-Q101 readiness (via HE3 variant), and precise 400 W surge handling - making it ideal for space-constrained automotive and industrial modules where thermal management and RoHS compliance are prioritized over extreme power headroom.
Availability
P4SMA18A-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC inputs, consumer power supply rails, and telecom line interface protection requiring stable component supply across production lifecycles.
Supply support for P4SMA18A-E3/61 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, TVS devices, and optoelectronics with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The P4SMA Series is engineered for surface-mount transient suppression in cost-sensitive, high-reliability applications - targeting automotive electronics, industrial controls, and consumer power systems where consistent clamping performance and AEC-Q101 readiness are critical.
FAQ
What is the maximum clamping voltage of the P4SMA18A-E3/61 under a 10/1000 µs surge?
The P4SMA18A-E3/61 has a maximum clamping voltage (VC) of 25.2 V at 15.9 A peak pulse current with a 10/1000 µs waveform. This value is measured under standardized test conditions using 0.2" × 0.2" copper pads per JEDEC guidelines and represents the highest voltage imposed on the protected circuit during worst-case transient events. The P4SMA18A-E3/61 maintains this clamping performance across its full operating temperature range.
Is the P4SMA18A-E3/61 RoHS-compliant and halogen-free?
Yes, the P4SMA18A-E3/61 carries the "E3" suffix, indicating RoHS-compliance per EU Directive 2011/65/EU and exemption 7a, with lead content <1000 ppm. It is not halogen-free; for halogen-free and RoHS-compliant versions, specify P4SMA18A-M3/61. Both variants meet JESD 201 Class 2 whisker resistance and UL 94 V-0 flammability requirements.
Does the P4SMA18A-E3/61 have AEC-Q101 qualification?
The base P4SMA18A-E3/61 is commercial-grade and not AEC-Q101 qualified. However, Vishay offers AEC-Q101-qualified variants under ordering codes P4SMA18AHE3_A/H and P4SMA18AHM3_A/H (with "HE3" or "HM3" suffixes). These undergo full stress testing per AEC-Q101 Rev D, including temperature cycling, high-temperature reverse bias, and unbiased highly accelerated stress testing.
What is the thermal resistance of the P4SMA18A-E3/61, and how does it affect PCB layout?
The P4SMA18A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads. To maintain safe junction temperatures under sustained power dissipation, designers must ensure adequate copper area and avoid thermal isolation. Increasing pad size or adding thermal vias reduces RθJA, directly extending surge endurance and steady-state reliability of the P4SMA18A-E3/61.
How does the P4SMA18A-E3/61 differ from bidirectional TVS diodes like P4SMA18CA?
The P4SMA18A-E3/61 is unidirectional and conducts only in reverse bias above 17.1–18.9 V, while P4SMA18CA is bidirectional with symmetrical breakdown in both directions. Unidirectional types offer lower leakage (<1 µA vs. ~5 µA for bidirectional at same VWM) and are preferred for DC power rail protection. Bidirectional variants suit AC-coupled signal lines or floating buses where polarity reversal may occur - the P4SMA18A-E3/61 is not interchangeable with P4SMA18CA without circuit redesign.
P4SMA18A-E3/61 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):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 15.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA18A-E3/61 FAQ
1.How can I place an order for P4SMA18A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA18A-E3/61 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 P4SMA18A-E3/61 reliable?
The price and inventory of P4SMA18A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA18A-E3/61 is usually 5 days.
3.What payment methods are accepted for P4SMA18A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA18A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA18A-E3/61?
P4SMA18A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA18A-E3/61 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 P4SMA18A-E3/61?
For technical support, including P4SMA18A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA18A-E3/61 requirements.
6.How does Aetrix verify that P4SMA18A-E3/61 is sourced from the original manufacturer or authorized distributors?
All P4SMA18A-E3/61 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 P4SMA18A-E3/61 meets industry standards.
7.What is the process for return or replacement of P4SMA18A-E3/61?
All P4SMA18A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA18A-E3/61, 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 P4SMA18A-E3/61 part is unused and in its original packaging.
Return procedure for P4SMA18A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA18A-E3/61 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 …
