My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMA5J20A-E3/5A
- Part No.:
- SMA5J20A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J20A-E3/5A.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,545
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMA5J20A-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on power and signal lines. It features a 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR), 32.4 V clamping voltage (VC) at 15.4 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMA5J20A-E3/5A datasheet, SMA5J20A-E3/5A pinout, SMA5J20A-E3/5A application, or SMA5J20A-E3/5A equivalent, key selection criteria include verified clamping performance under 15.4 A surge, unidirectional polarity with cathode band marking, RoHS-compliant matte tin-plated leads, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 20 V, it avalanches at VBR (min 22.2 V, max 24.5 V @ 1 mA), limiting transient energy by diverting surge current to ground. Its low incremental surge resistance ensures stable clamping up to 32.4 V at IPPM = 15.4 A (10/1000 µs).
Thermal design relies on RθJA = 80 °C/W (typ.) and RθJL = 25 °C/W (typ.), enabling operation from –55 °C to +150 °C junction temperature. The glass-passivated junction and MSL Level 1 moisture sensitivity rating support robust reflow soldering at 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 24 V rail protection. |
| VBR (min/max) | 22.2 V / 24.5 V @ 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 32.4 V @ 15.4 A - clamped voltage during 500 W transient; determines protected circuit's maximum overvoltage stress. |
| PPPM | 500 W - peak pulse power handling (10/1000 µs); supports IEC 61000-4-5 Level 4 surge immunity compliance. |
| IFSM | 40 A - non-repetitive forward surge rating (8.3 ms half-sine); enables use in DC power input stages with inrush or fault currents. |
| Junction Temp | –55 °C to +150 °C - wide operating range suitable for under-hood automotive and industrial ambient conditions. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads; cathode indicated by a band on the body; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / surge return path | Connected to protected line's low-side or ground reference; must route with low-inductance path to earth or chassis ground. |
| Cathode | Reverse-biased terminal / clamping node | Connected to protected line (e.g., 24 V supply); band-marked end; carries full surge current during transients. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMA package | Enables high-density PCB layouts and compatibility with standard 7" or 13" tape-and-reel SMT feeders (E3/5A = 7500 pcs/reel). |
| Glass-passivated junction | Ensures long-term reliability and stable VBR drift < ±5 % over lifetime under thermal cycling and humidity exposure. |
| MSL Level 1 rating | Permits single-reflow soldering without baking; peak temperature tolerance up to 260 °C per J-STD-020. |
| RoHS-compliant (E3 suffix) | Meets EU Directive 2011/65/EU; lead-free matte tin plating compatible with Pb-free and SnPb assembly processes. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs against load dump (ISO 16750-2) and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp surges above 20 V. Use Value: Clamps to ≤32.4 V at 15.4 A, preventing damage to downstream DC-DC converters and microcontrollers rated for 36 V absolute max. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in PLC I/O modules exposed to field wiring ESD and inductive kick. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) unidirectional TVS on 0–10 V or 4–20 mA output lines. Use Value: Fast response time and 32.4 V clamping prevent latch-up or gate oxide rupture in op-amps and ADC drivers during 8 kV contact ESD events. |
| Consumer DC Adapter Interface | Telecom PoE Power Feed Protection |
Use Scenario: Input-stage surge suppression for USB-C PD adapters and wall-mounted AC/DC converters. IC Role / Device Role / Timing Role: Primary-side TVS on secondary-side 12–20 V DC output rails to absorb coupling transients from primary-side switching noise. Use Value: 500 W rating handles repetitive 10/1000 µs surges from nearby relay switching; RoHS/E3 compliance supports global market access. |
Use Scenario: Secondary-side protection on IEEE 802.3af/at Power over Ethernet (PoE) powered devices (PDs) receiving 44–57 V DC. IC Role / Device Role / Timing Role: Standoff-rated TVS on PoE interface inputs to limit voltage overshoot during hot-swap insertion or cable discharge events. Use Value: 20 V VWM allows use on auxiliary bias rails (e.g., 12 V control logic) derived from PoE, with 32.4 V clamping preserving logic-level integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J20CA-E3/5A | Bidirectional variant; symmetric VBR (22.2–24.5 V) in both polarities; no polarity marking. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where reverse voltage may occur. | Select only if bidirectional clamping is needed; not a drop-in replacement due to polarity and layout implications. |
| SMBJ20A-E3/52 | Same VWM/VC specs but in larger SMB (DO-214AA) package; higher IPPM = 23.3 A; RθJA = 65 °C/W. | Better thermal dissipation for high-duty-cycle surges; requires larger PCB pad area (6.0 mm × 5.0 mm vs. 5.0 mm × 5.0 mm). | Choose when sustained surge repetition or higher ambient temperature demands lower thermal resistance. |
Compared with SMA5J20A-E3/5A, the SMA5J20CA-E3/5A enables symmetrical protection without polarity constraints but sacrifices unidirectional leakage optimization, while the SMBJ20A-E3/52 trades compactness for enhanced thermal margin and surge current headroom - both require layout review and are not pin-compatible replacements.
Availability
SMA5J20A-E3/5A is available at Aetrix Electronics and suitable for automotive power input protection, industrial sensor signal line protection, and consumer DC adapter interface applications requiring stable component supply, RoHS compliance, and AEC-Q101-qualified alternatives.
Supply support for SMA5J20A-E3/5A 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, MOSFETs, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMA5J series is engineered for high-power-density transient suppression in space-constrained SMT designs, targeting automotive, industrial, and telecom systems where fast clamping, low leakage, and reflow robustness are critical.
FAQ
What is the clamping voltage of the SMA5J20A-E3/5A under maximum surge conditions?
The SMA5J20A-E3/5A has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 15.4 A using a 10/1000 µs waveform. This value is measured at TA = 25 °C on 5.0 mm × 5.0 mm copper pads and represents the upper voltage limit imposed on the protected circuit during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is the SMA5J20A-E3/5A RoHS-compliant and lead-free?
Yes, the SMA5J20A-E3/5A is RoHS-compliant and lead-free, as indicated by the "E3" suffix per Vishay's ordering nomenclature. Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards, and it passes JESD 201 Class 2 whisker testing - making it suitable for both Pb-free and SnPb reflow processes without compromise in reliability or wetting performance.
Does the SMA5J20A-E3/5A have AEC-Q101 qualification?
No, the SMA5J20A-E3/5A is not AEC-Q101 qualified. That qualification applies only to variants with "HE3" or "HM3" suffixes (e.g., SMA5J20AHE3_A). The E3/5A version is commercial-grade, rated for –55 °C to +150 °C operation but not certified to the extended stress test requirements of AEC-Q101 - users requiring automotive qualification must select the HE3-suffixed part number.
What is the mounting pad layout recommendation for the SMA5J20A-E3/5A?
Vishay specifies a minimum pad layout of 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads for each terminal of the SMA5J20A-E3/5A to achieve rated thermal and surge performance. Deviating from this layout reduces power derating capability and increases junction temperature rise - especially critical when operating near the 150 °C TJmax limit or under repeated surge conditions.
How does the SMA5J20A-E3/5A differ from the SMA5J20CA-E3/5A?
The SMA5J20A-E3/5A is unidirectional with cathode band marking and optimized reverse leakage (<1.0 µA at 20 V), while the SMA5J20CA-E3/5A is bidirectional with identical VBR in both directions and no polarity marking. Their electrical parameters match closely, but the CA version cannot replace the A version in DC-biased circuits without verifying reverse conduction behavior and leakage impact on system bias networks.
SMA5J20A-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 15.4A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J20A-E3/5A FAQ
1.How can I place an order for SMA5J20A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J20A-E3/5A 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 SMA5J20A-E3/5A reliable?
The price and inventory of SMA5J20A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J20A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J20A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J20A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J20A-E3/5A?
SMA5J20A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J20A-E3/5A 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 SMA5J20A-E3/5A?
For technical support, including SMA5J20A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J20A-E3/5A requirements.
6.How does Aetrix verify that SMA5J20A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J20A-E3/5A 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 SMA5J20A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J20A-E3/5A?
All SMA5J20A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J20A-E3/5A, 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 SMA5J20A-E3/5A part is unused and in its original packaging.
Return procedure for SMA5J20A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J20A-E3/5A 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 …
