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Vishay General Semiconductor - Diodes Division SM8S28A-3HE3/2D
- Part No.:
- SM8S28A-3HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S28A-3HE3/2D.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,736
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Product details
Overview
SM8S28A-3HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor designed for automotive load dump protection in 12 V systems. It features a 31.1 V minimum breakdown voltage (VBR), 45.4 V maximum clamping voltage (VC) at 145 A peak pulse current, and 6600 W peak pulse power (10/1000 µs), operating up to TJ = 175 °C.
For engineers reviewing the SM8S28A-3HE3/2D datasheet, SM8S28A-3HE3/2D pinout, SM8S28A-3HE3/2D application, or SM8S28A-3HE3/2D equivalent, key selection criteria include unidirectional polarity, DO-218AB package thermal performance (RθJC = 0.90 °C/W), AEC-Q101 qualification, ISO7637-2 compliance, and 28.0 V stand-off voltage (VWM) for 12 V automotive rail protection.
Technical Context
The SM8S28A-3HE3/2D uses passivated anisotropic rectifier technology optimized for high-temperature stability and low leakage (<10 µA at VWM). Its unidirectional configuration places the heatsink as the anode terminal, enabling direct thermal coupling to PCB copper for enhanced surge dissipation under load dump transients.
It delivers 6600 W peak pulse power with 10/1000 µs waveform and sustains 5200 W with 10/10 000 µs waveform-critical for meeting ISO7637-2 Pulse 5a/b test profiles. The device is rated for 700 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits VF ≤ 1.8 V at IF = 100 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.1 V / 34.4 V - defines reliable turn-on threshold for transient suppression above 28 V nominal rail |
| VWM | 28.0 V - maximum continuous reverse voltage before leakage exceeds 10 µA, matching 12 V system nominal + tolerance |
| VC @ IPPM | 45.4 V - clamped voltage during 145 A 10/1000 µs surge, limiting downstream IC stress |
| PPPM (10/1000 µs) | 6600 W - enables single-pulse handling of severe automotive load dump events without failure |
| TJ max | 175 °C - supports operation in engine compartment environments per AEC-Q101 requirements |
| RθJC | 0.90 °C/W - allows efficient heat transfer to heatsink or copper pour, critical for sustained power dissipation |
| Polarity | Unidirectional - anode connected to heatsink terminal, cathode to protected line, enabling forward-biased clamping |
Pinout & Package
Package: DO-218AB - surface-mount, thermally enhanced case with matte tin-plated leads, UL 94 V-0 molding compound, MSL Level 1, and JESD 201 Class 2 whisker resistance. Heatsink tab serves as anode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries transient current into device during overvoltage event |
| Lead 2 / Metal Heatsink | Anode | Primary thermal path and electrical return; must be soldered to large copper area for RθJC optimization |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use with temperature cycling, humidity, and mechanical shock testing |
| Junction passivation | Reduces long-term leakage drift and improves reliability under high-temperature bias stress |
| Low VF (≤1.8 V @ 100 A) | Minimizes conduction loss and self-heating during high-current surge events |
| ISO7637-2 compliant | Meets Pulse 5a (load dump) requirements for 12 V vehicle electrical systems |
| MSL Level 1 | Enables standard SMT reflow without moisture sensitivity concerns or baking requirements |
Applications
| Automotive Load Dump Protection | 12 V Power Rail Surge Suppression |
|---|---|
Use Scenario: Protecting ECUs, body control modules, and infotainment systems from 12 V battery line transients caused by alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping transient energy directly at power input stage. Use Value: Limits voltage to ≤45.4 V during 145 A surges, preventing damage to downstream DC/DC converters and microcontrollers rated for ≤42 V absolute maximum. | Use Scenario: Safeguarding CAN transceivers, LIN nodes, and sensor interfaces powered from a shared 12 V rail subject to switching noise and relay bounce. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed upstream of LDO regulators and interface ICs. Use Value: Maintains VWM = 28.0 V to avoid false triggering while clamping sub-100 ns spikes to safe levels, preserving signal integrity. |
| Engine Control Unit (ECU) Input Protection | Start-Stop System Power Conditioning |
Use Scenario: Shielding fuel injection drivers and ignition coil controllers from high-energy transients generated during cranking and alternator regulation transitions. IC Role / Device Role / Timing Role: Primary front-end surge protector mounted adjacent to bulk capacitor on main power entry. Use Value: Withstands 700 A IFSM (8.3 ms) and operates continuously at TJ = 175 °C, ensuring robustness in high-ambient under-hood locations. | Use Scenario: Stabilizing power delivery to microcontrollers and memory in vehicles with frequent engine restart cycles causing repeated voltage overshoots. IC Role / Device Role / Timing Role: High-reliability TVS integrated into power supply filter stage of start-stop logic board. Use Value: Delivers 6600 W peak pulse power and maintains <10 µA leakage at 28 V, minimizing standby current drain while surviving repetitive load dump events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/5AT | Lower PPPM = 400 W (10/1000 µs); DO-214AC package; RθJC not specified | Not rated for AEC-Q101 or ISO7637-2; limited to low-energy industrial transients | Select only for cost-sensitive non-automotive designs where 6600 W surge capability is unnecessary |
| TPSMD28A | Same VWM/VBR range but lower PPPM = 3000 W; TO-277 package; AEC-Q101 qualified | Lacks ISO7637-2 validation; insufficient for full load dump compliance in OEM automotive | Acceptable for Tier 2 subsystems with derated surge requirements, but not for primary ECU protection |
Compared with SMAJ28A-E3/5AT and TPSMD28A, the SM8S28A-3HE3/2D uniquely combines AEC-Q101 qualification, ISO7637-2 compliance, 6600 W surge rating, and DO-218AB thermal performance-making it the only option among the three validated for front-line automotive load dump protection.
Availability
SM8S28A-3HE3/2D is available at Aetrix Electronics and suitable for automotive electronic control units, 12 V power rail protection, and engine management systems requiring stable component supply across extended production lifecycles.
Supply support for SM8S28A-3HE3/2D 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 protection devices with emphasis on automotive, industrial, and computing applications.
The SM8SxxA series is engineered specifically for high-energy automotive transient suppression, targeting load dump and inductive switching events in 12 V and 24 V vehicle architectures with AEC-Q101 and ISO7637-2 alignment.
FAQ
What is the clamping voltage of the SM8S28A-3HE3/2D at its rated peak pulse current?
The SM8S28A-3HE3/2D has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated 145 A peak pulse current (IPPM) using a 10/1000 µs waveform. This value is measured at TC = 25 °C and ensures downstream components see voltage limited below critical thresholds. The SM8S28A-3HE3/2D maintains this clamping performance across its operational junction temperature range up to 175 °C.
Is the SM8S28A-3HE3/2D qualified for automotive applications?
Yes, the SM8S28A-3HE3/2D is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO7637-2 load dump requirements and is rated for continuous operation at TJ = 175 °C. The DO-218AB package is MSL Level 1 and passes JESD 201 Class 2 whisker testing. The SM8S28A-3HE3/2D is intended for under-hood and ECU-level protection in production vehicles.
What is the polarity configuration of the SM8S28A-3HE3/2D and how does it affect PCB layout?
The SM8S28A-3HE3/2D is unidirectional, with the metal heatsink tab serving as the anode and Lead 1 as the cathode. This requires the heatsink terminal to be connected to the system ground or low-side reference, while the cathode connects to the protected line. PCB layout must allocate a large copper pour under the heatsink for thermal management, as RθJC = 0.90 °C/W depends on this thermal path. The SM8S28A-3HE3/2D cannot be used in bidirectional configurations.
Does the SM8S28A-3HE3/2D meet RoHS and lead-free soldering requirements?
Yes, the SM8S28A-3HE3/2D is RoHS-compliant and features matte tin-plated leads compatible with J-STD-002 and JESD 22-B102 soldering standards. The HE3 suffix confirms compliance with JESD 201 Class 2 whisker resistance. It supports lead-free reflow profiles with a maximum peak temperature of 245 °C (MSL Level 1), and no pre-baking is required prior to assembly. The SM8S28A-3HE3/2D is fully qualified for modern SMT manufacturing.
How does the SM8S28A-3HE3/2D compare to standard SMAJ-series TVS diodes in surge capability?
The SM8S28A-3HE3/2D delivers 6600 W peak pulse power (10/1000 µs), over 16× higher than the 400 W rating of the SMAJ28A-E3/5AT. Its DO-218AB package provides superior thermal resistance (RθJC = 0.90 °C/W) versus DO-214AC, enabling sustained energy handling. Unlike SMAJ parts, the SM8S28A-3HE3/2D is AEC-Q101 and ISO7637-2 certified-making the SM8S28A-3HE3/2D suitable for primary automotive surge protection where SMAJ devices are limited to secondary or industrial use.
SM8S28A-3HE3/2D 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 145A
- Power - Peak Pulse:
- 6600W (6.6kW)
- 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-218AB
SM8S28A-3HE3/2D FAQ
1.How can I place an order for SM8S28A-3HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S28A-3HE3/2D 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 SM8S28A-3HE3/2D reliable?
The price and inventory of SM8S28A-3HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S28A-3HE3/2D is usually 5 days.
3.What payment methods are accepted for SM8S28A-3HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S28A-3HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S28A-3HE3/2D?
SM8S28A-3HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S28A-3HE3/2D 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 SM8S28A-3HE3/2D?
For technical support, including SM8S28A-3HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S28A-3HE3/2D requirements.
6.How does Aetrix verify that SM8S28A-3HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S28A-3HE3/2D 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 SM8S28A-3HE3/2D meets industry standards.
7.What is the process for return or replacement of SM8S28A-3HE3/2D?
All SM8S28A-3HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S28A-3HE3/2D, 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 SM8S28A-3HE3/2D part is unused and in its original packaging.
Return procedure for SM8S28A-3HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S28A-3HE3/2D Tags
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