My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM5S20-E3/2D
- Part No.:
- SM5S20-E3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S20-E3/2D.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,791
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM5S20-E3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 20 V stand-off voltage (VWM), 35.8 V maximum clamping voltage at 101 A peak pulse current, 3600 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM5S20-E3/2D datasheet, SM5S20-E3/2D pinout, SM5S20-E3/2D application, or SM5S20-E3/2D equivalent, key selection criteria include clamping performance under ISO 7637-2 load dump waveforms, TJ = 175 °C operation, DO-218AB package thermal resistance (RθJC = 1.0 °C/W), and unidirectional polarity with heatsink-as-anode configuration.
Technical Context
The SM5S20-E3/2D employs passivated anisotropic rectifier technology optimized for high-temperature stability and low leakage (<10 µA at VWM). Its junction-to-case thermal resistance of 1.0 °C/W enables effective heat transfer to a heatsink, supporting sustained 5 W power dissipation at TC = 25 °C.
It is rated for non-repetitive 10/1000 µs surge pulses up to 3600 W and meets ISO 7637-2 test conditions for automotive transients. The device operates across -55 °C to +175 °C and passes JESD201 Class 2 whisker testing with matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 22.2 V / 27.1 V - Breakdown voltage range at 5 mA test current; defines turn-on threshold consistency |
| VC @ IPPM | 35.8 V - Clamping voltage at 101 A peak pulse current; limits downstream voltage stress during transients |
| PPPM (10/1000 µs) | 3600 W - Peak surge power handling capability; supports ISO 7637-2 load dump compliance |
| TJ max. | +175 °C - Maximum junction temperature; enables placement near hot engine compartments |
| RθJC | 1.0 °C/W - Thermal resistance from junction to case; dictates heatsink sizing for 5 W steady-state dissipation |
| AEC-Q101 | Qualified - Confirmed reliability for automotive electronic systems per stress-test standard |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with metal heatsink tab (anode), UL 94 V-0 rated molding compound, and matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit's positive rail; carries transient current into the device during clamping |
| Lead 2 / Metal Heatsink | Anode | Must be connected to system ground or chassis; serves as primary thermal path and electrical return |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design ensures stable breakdown and low leakage over lifetime and temperature |
| TJ = 175 °C rating | Enables direct mounting in high-ambient zones (e.g., engine control units) without derating penalties |
| MSL Level 1 | Reflow-compatible up to 245 °C peak without moisture-induced damage; no bake required pre-assembly |
| ISO 7637-2 compliance | Validated for load dump and switching transient suppression in 12 V automotive networks |
| Low VF (≤2.0 V @ 100 A) | Minimizes forward conduction loss during high-current surges, reducing thermal stress on the device |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protects microcontroller power rails from 12 V battery line transients caused by alternator load dump and relay coil de-energization. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery input and DC-DC converter input, clamping surges within 100 ns. Use Value: Limits voltage to ≤35.8 V at 101 A, preventing latch-up or permanent damage to downstream regulators and MCUs. | Use Scenario: Shields BCM power supply from inductive kickback generated by door lock actuators, window motors, and lighting loads. IC Role / Device Role / Timing Role: Primary transient suppressor on main 12 V input, mounted directly to PCB copper pour acting as heatsink. Use Value: Withstands 3600 W surges and operates reliably at 175 °C ambient, ensuring long-term function in sealed modules. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) ECU |
Use Scenario: Safeguards image sensor and serializer ICs in rear-view or surround-view cameras exposed to vehicle-level transients. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp on camera module's 12 V input, positioned upstream of LDOs and PMICs. Use Value: Low clamping voltage (35.8 V) prevents overvoltage shutdown of sensitive analog front-ends while maintaining signal integrity. | Use Scenario: Protects motor driver ICs and position sensors in EPS systems subjected to repeated load dump events during ignition cycling. IC Role / Device Role / Timing Role: High-surge-capability TVS integrated into power stage PCB layout with direct thermal coupling to metal core heatsink. Use Value: RθJC = 1.0 °C/W enables efficient heat extraction during repetitive 10/1000 µs pulses, preserving clamping performance over time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/5AT | Lower PPPM (400 W vs. 3600 W); SMA package (RθJC ≈ 40 °C/W); bidirectional option available | Not suitable for load dump; limited to lower-energy ESD/surge events in non-automotive consumer gear | Select only for cost-sensitive, low-power applications where 3600 W surge immunity is unnecessary |
| TPSMD20A | Same DO-218AB package; 3600 W PPPM; but VWM = 20 V, VC = 32.4 V (A-grade variant); tighter VBR tolerance | Direct functional replacement with improved clamping margin; identical thermal and mechanical interface | Prefer when lower clamping voltage (32.4 V vs. 35.8 V) is critical for downstream 3.3 V or 5 V logic protection |
Compared with SMAJ20A-E3/5AT and TPSMD20A, the SM5S20-E3/2D delivers superior surge robustness for automotive load dump while maintaining AEC-Q101 qualification and DO-218AB thermal performance-making it the preferred choice for under-hood 12 V systems requiring validated high-energy clamping.
Availability
SM5S20-E3/2D is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power supplies, and electric power steering ECUs requiring stable component supply and AEC-Q101-compliant transient protection.
Supply support for SM5S20-E3/2D 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, MOSFETs, and TVS devices with emphasis on reliability, thermal performance, and automotive qualification.
The SM5Sxx series is part of Vishay's PAR® (Passivated Anisotropic Rectifier) TVS platform, engineered specifically for high-energy automotive load dump protection with extended temperature operation and industry-standard DO-218AB packaging.
FAQ
What is the clamping voltage of the SM5S20-E3/2D at its rated peak pulse current?
The SM5S20-E3/2D has a maximum clamping voltage (VC) of 35.8 V at its specified peak pulse current (IPPM) of 101 A under a 10/1000 µs waveform. This value is measured per the test conditions defined in the Vishay datasheet document 88382 and reflects the upper limit of voltage seen by downstream circuitry during worst-case surge events. The SM5S20-E3/2D maintains this clamping performance across its full operating temperature range.
Is the SM5S20-E3/2D suitable for bidirectional transient suppression?
No, the SM5S20-E3/2D is a unidirectional TVS diode only, with polarity defined as heatsink = anode and lead 1 = cathode. It is not rated for reverse standoff or clamping in the reverse direction. For bidirectional protection, engineers must select a designated bidirectional variant such as SM5S20A-E3/2D (VWM = 20 V, VC = 32.4 V), which is explicitly listed in the same datasheet family.
Does the SM5S20-E3/2D require a heatsink to meet its 3600 W surge rating?
The 3600 W peak pulse power rating of the SM5S20-E3/2D is specified for a single non-repetitive 10/1000 µs pulse and does not require external heatsinking for that event. However, its 5 W steady-state power dissipation rating assumes mounting on an infinite heatsink at TC = 25 °C. In practice, the metal heatsink tab (anode) must be soldered to a minimum 100 mm² copper area to achieve the published RθJC = 1.0 °C/W and avoid thermal runaway during repeated surges.
What automotive standards does the SM5S20-E3/2D comply with?
The SM5S20-E3/2D is AEC-Q101 qualified and meets ISO 7637-2 surge test requirements for automotive applications, including Load Dump (Pulse 5a/5b) and Switching Transients (Pulse 1/2a/2b/3a/3b). Compliance is verified per the test conditions and waveforms documented in Vishay's official datasheet 88382, and the device is rated for operation from -55 °C to +175 °C to support under-hood deployment.
How does the DO-218AB package of the SM5S20-E3/2D differ from standard SMA or SMB packages?
The DO-218AB package used by the SM5S20-E3/2D features an integrated metal heatsink tab (anode) that provides significantly lower thermal resistance (RθJC = 1.0 °C/W) compared to SMA (≈40 °C/W) or SMB (≈25 °C/W) packages. Its larger footprint and direct metal-to-PCB thermal path enable higher surge energy handling and sustained power dissipation-critical for automotive load dump protection where the SM5S20-E3/2D delivers 3600 W versus ~400 W for SMAJ-class devices.
SM5S20-E3/2D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 101A
- Power - Peak Pulse:
- 3600W (3.6kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
SM5S20-E3/2D FAQ
1.How can I place an order for SM5S20-E3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S20-E3/2D 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 SM5S20-E3/2D reliable?
The price and inventory of SM5S20-E3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S20-E3/2D is usually 5 days.
3.What payment methods are accepted for SM5S20-E3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S20-E3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S20-E3/2D?
SM5S20-E3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S20-E3/2D 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 SM5S20-E3/2D?
For technical support, including SM5S20-E3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S20-E3/2D requirements.
6.How does Aetrix verify that SM5S20-E3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S20-E3/2D 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 SM5S20-E3/2D meets industry standards.
7.What is the process for return or replacement of SM5S20-E3/2D?
All SM5S20-E3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S20-E3/2D, 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 SM5S20-E3/2D part is unused and in its original packaging.
Return procedure for SM5S20-E3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S20-E3/2D 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 …
