My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM5S20AHM3/I
- Part No.:
- SM5S20AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM5S20AHM3/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,702
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM5S20AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in DO-218AB package, rated for 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR), 3600 W peak pulse power (10/1000 μs), and AEC-Q101 qualified for automotive load dump protection.
For engineers reviewing the SM5S20AHM3/I datasheet, SM5S20AHM3/I pinout, SM5S20AHM3/I application, or SM5S20AHM3/I equivalent, this device serves as a high-reliability TVS diode for 12 V automotive power rail surge suppression with 175 °C junction capability, low leakage (<10 μA at VWM), and MSL Level 1 moisture sensitivity.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping under repetitive transients, with thermal resistance RθJM = 0.45 °C/W enabling efficient heat transfer to the metal heatsink (anode). Its unidirectional polarity and 2.0 V max forward voltage at 100 A support robust reverse-biased surge clamping without forward conduction during normal operation.
The device meets ISO 7637-2 surge test requirements for automotive load dump and is characterized across -55 °C to +175 °C operating range. Its DO-218AB package integrates a metal heatsink terminal that serves as the anode, providing low-inductance current path and enhanced thermal performance versus standard SMD packages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; sets threshold for 12 V automotive system protection. |
| VBR (min/typ/max) | 22.2 / 23.4 / 24.5 V - Verified breakdown range at 5 mA; ensures reliable turn-on margin above VWM for noise immunity. |
| VC @ IPPM | 32.4 V - Clamping voltage at 111 A peak pulse (10/1000 μs); limits downstream voltage stress during load dump events. |
| PPPM (10/1000 μs) | 3600 W - Peak surge power handling; supports high-energy transients per ISO 7637-2 Pulse 5a without failure. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood environments with no derating up to 125 °C ambient. |
| ID @ VWM | <10 μA - Reverse leakage at rated stand-off; minimizes quiescent power loss in always-on vehicle modules. |
| IFSM | 500 A - Non-repetitive forward surge rating; withstands high-current inrush or fault conditions without bond wire failure. |
Pinout & Package
Package: DO-218AB - Surface-mount package with integrated metal heatsink (anode) and molded body meeting UL 94 V-0. Anode terminal is the large metal tab; cathode is the smaller lead. Mounting pad layout follows IPC-7351 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Metal Heatsink Tab) | High-current return path and thermal interface | Serves as primary surge current sink and direct thermal conduction path to PCB copper pour or heatsink; must be soldered to ≥100 mm² copper area. |
| Cathode (Lead 1) | Surge voltage sensing and clamping node | Connected to protected line (e.g., battery rail); reverse-biased during normal operation and avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, UHAST, and mechanical shock per JESD47; supports PPAP documentation. |
| Junction passivation | Optimized die surface treatment prevents moisture ingress and parametric drift under high-humidity, high-temperature bias life testing. |
| MSL Level 1 rating | Can be reflowed at peak 245 °C without popcorn effect or delamination; eliminates pre-bake requirement for high-volume SMT assembly. |
| ISO 7637-2 compliance | Tested to Pulse 5a (load dump) waveform with 10 ms exponential decay; clamps to ≤32.4 V at 111 A, protecting downstream DC-DC converters and MCUs. |
| Low thermal resistance RθJM | 0.45 °C/W from junction to metal tab enables >90 % of surge energy dissipation via heatsink rather than PCB traces. |
Applications
| Automotive Load Dump Protection | 12 V Power Rail Surge Suppression |
|---|---|
Use Scenario: Protecting engine control units (ECUs) and body control modules (BCMs) during alternator load dump events where battery disconnection causes 40 V+ spikes on the 12 V rail. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery input and input filter capacitor, clamping transients within 1 ns response time. Use Value: Limits voltage to ≤32.4 V at 111 A, preventing damage to 36 V-rated DC-DC regulators and ensuring uninterrupted MCU operation. |
Use Scenario: Safeguarding infotainment head units and ADAS camera modules against switching transients from fuel pumps, fans, and solenoids. IC Role / Device Role / Timing Role: Standoff protector on main 12 V input, operating continuously at 20 V with <10 μA leakage to minimize standby power draw. Use Value: Maintains system availability during cold-cranking (down to -40 °C) and hot-soak (up to +175 °C junction), validated per AEC-Q101. |
| Industrial Vehicle Power Systems | Commercial Truck Battery Management |
Use Scenario: Securing programmable logic controllers (PLCs) and CAN gateways in construction equipment exposed to generator-induced surges and cable inductance spikes. IC Role / Device Role / Timing Role: Primary transient clamp on 24 V nominal systems, leveraging 3600 W peak power rating to absorb multi-pulse surge sequences. Use Value: Survives repeated 10/1000 μs surges up to 3600 W without parameter shift, verified by accelerated life testing at TJ = 175 °C. |
Use Scenario: Protecting battery monitoring ICs and charge controllers in Class 8 truck auxiliary power distribution units subject to ISO 16750-2 load dump profiles. IC Role / Device Role / Timing Role: High-reliability TVS mounted directly to chassis ground plane via metal tab anode, minimizing loop inductance. Use Value: Achieves <0.5 Ω total clamping loop impedance, reducing overshoot during 100 A/μs edge-rate transients per ISO 7637-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20AHE3_A/H | Lower PPPM (400 W), SMA package (DO-214AC), RθJA = 60 °C/W, no metal heatsink tab | Suitable for lower-energy consumer or industrial I/O protection; not rated for ISO 7637-2 load dump | Select when cost-sensitive, non-automotive designs require basic ESD/surge protection with simpler layout. |
| SMCJ20AHE3_A/H | Same VWM/VBR, higher PPPM (3000 W), larger SMC package (DO-214AB), RθJM = 0.85 °C/W, no anode heatsink | Used in mid-tier automotive modules where 3000 W suffices and board space allows larger footprint | Choose when DO-218AB's metal heatsink is unnecessary but higher surge margin than SMAJ is required. |
Compared with SMAJ20AHE3_A/H and SMCJ20AHE3_A/H, the SM5S20AHM3/I delivers 20× higher peak power (3600 W vs. 400 W), direct metal thermal path (RθJM = 0.45 °C/W), and full AEC-Q101/ISO 7637-2 validation-making it the only option qualified for critical 12 V automotive load dump protection.
Availability
SM5S20AHM3/I is available at Aetrix Electronics and suitable for automotive ECU protection, 12 V power rail surge suppression, and industrial vehicle power systems requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SM5S20AHM3/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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The SM5S family is engineered specifically for automotive-grade transient suppression, combining high-temperature silicon design, metal-heatsink packaging, and rigorous AEC-Q101 validation to meet ISO 7637-2 load dump requirements.
FAQ
What is the maximum clamping voltage of the SM5S20AHM3/I under a 10/1000 μs surge?
The SM5S20AHM3/I has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 111 A using the 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components see limited overvoltage stress during standardized load dump events defined in ISO 7637-2.
Is the SM5S20AHM3/I suitable for bidirectional transient protection?
No, the SM5S20AHM3/I is unidirectional only, with polarity marked by the metal heatsink serving as the anode. It is designed to clamp positive transients on a DC line referenced to ground. For bidirectional protection, two devices in series-opposing configuration or a dedicated bidirectional TVS such as SMBJ20CAHE3_A/H would be required.
What does the "HM3" suffix indicate in SM5S20AHM3/I?
In SM5S20AHM3/I, "H" denotes AEC-Q101 qualification, "M3" specifies the DO-218AB package with matte tin-plated leads and RoHS-compliant, halogen-free molding compound (E3), and "I" indicates 13-inch tape-and-reel packaging with anode orientation toward sprocket holes. The full suffix confirms automotive-grade reliability and SMT-ready delivery format.
How does the DO-218AB package improve thermal performance compared to standard SMC or SMA packages?
The DO-218AB package of the SM5S20AHM3/I integrates a large metal heatsink tab as the anode terminal, achieving RθJM = 0.45 °C/W-over 50 % lower than typical SMC packages. This enables >90 % of surge energy to dissipate directly into the PCB copper or external heatsink, reducing junction temperature rise and improving reliability under repetitive surge conditions.
Does the SM5S20AHM3/I meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, the SM5S20AHM3/I is rated MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 245 °C. This eliminates the need for dry-packaging or pre-baking prior to standard lead-free reflow soldering, supporting high-yield, high-throughput SMT manufacturing for automotive electronics.
SM5S20AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- Series:
- PAR®
- 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):
- 111A
- Power - Peak Pulse:
- 3600W (3.6kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AC
SM5S20AHM3/I FAQ
1.How can I place an order for SM5S20AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S20AHM3/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 SM5S20AHM3/I reliable?
The price and inventory of SM5S20AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S20AHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S20AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S20AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S20AHM3/I?
SM5S20AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S20AHM3/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 SM5S20AHM3/I?
For technical support, including SM5S20AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S20AHM3/I requirements.
6.How does Aetrix verify that SM5S20AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S20AHM3/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 SM5S20AHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S20AHM3/I?
All SM5S20AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S20AHM3/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 SM5S20AHM3/I part is unused and in its original packaging.
Return procedure for SM5S20AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S20AHM3/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 …
