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Vishay General Semiconductor - Diodes Division SM5S33HE3/2D
- Part No.:
- SM5S33HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S33HE3/2D.pdf
- Description:
- TVS DIODE 33VWM 59VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,725
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Product details
Overview
SM5S33HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor diode designed for automotive load dump protection. It features a 33.0 V stand-off voltage (VWM), 36.7–44.9 V breakdown range (VBR), 59.0 V clamping voltage at 61 A peak pulse current, 3600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood automotive electronics.
For engineers reviewing the SM5S33HE3/2D datasheet, SM5S33HE3/2D pinout, SM5S33HE3/2D application, or SM5S33HE3/2D equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail protection where TJ = 175 °C operation, low leakage (<10 μA at VWM), and ISO7637-2 compliance are required.
Technical Context
The SM5S33HE3/2D employs passivated anisotropic rectifier technology to achieve stable clamping performance across -55 °C to +175 °C junction temperature. Its DO-218AB package integrates a metal heatsink as the anode terminal, enabling direct thermal coupling to PCB copper for sustained 5 W power dissipation at TC = 25 °C.
It delivers 61 A peak pulse current under 10/1000 μs waveform with 59.0 V clamping, meeting ISO7637-2 load dump surge requirements. The device exhibits <2.0 V forward voltage at 100 A surge and passes JESD201 Class 2 whisker testing due to matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.0 V - Maximum continuous reverse operating voltage before clamping begins; sets system overvoltage trip threshold in 24 V automotive rails. |
| VBR (min/max) | 36.7 V / 44.9 V - Breakdown voltage range at 5 mA test current; ensures consistent turn-on behavior across production lots and temperature. |
| VC @ IPPM | 59.0 V - Clamping voltage at 61 A peak pulse current (10/1000 μs); defines maximum voltage seen by protected downstream ICs during transients. |
| PPPM (10/1000 μs) | 3600 W - Peak pulse power handling capability; supports robust protection against severe load dump events per ISO7637-2. |
| TJ max. | +175 °C - Maximum junction temperature rating; enables placement near hot engine control units without derating concerns. |
| Leakage @ VWM | <10 μA at 25 °C - Low reverse leakage preserves battery life in always-on automotive modules and avoids false triggering. |
| AEC-Q101 | Qualified - Certified for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per AEC standard. |
Pinout & Package
Package: DO-218AB - Surface-mount, thermally enhanced case with integral metal heatsink acting as anode terminal; meets UL 94 V-0 flammability rating and MSL Level 1 (245 °C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (Anode) | Anode connection | Connected to protected line (e.g., battery rail); must be routed to large copper pour for thermal management. |
| Lead 2 / Metal Heatsink | Cathode connection | Primary cathode terminal and thermal interface; soldered directly to PCB ground plane for optimal heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure ensures stable VBR and low leakage over lifetime and temperature extremes. |
| DO-218AB thermal design | 1.0 °C/W typical RθJC enables 5 W continuous dissipation on infinite heatsink; reduces need for external heatsinks in space-constrained ECUs. |
| ISO7637-2 compliance | Validated for load dump surge immunity using 10 ms exponential waveform; eliminates need for additional TVS staging in basic 12 V/24 V systems. |
| JESD201 Class 2 whisker resistance | Matte tin plating prevents tin whisker growth under thermal cycling, critical for long-life automotive deployments (>15 years). |
| Uni-directional polarity | Enables precise clamping only on positive transients; avoids unintended conduction during normal reverse-biased operation in DC systems. |
Applications
| Engine Control Unit (ECU) Power Protection | Body Control Module (BCM) Input Protection |
|---|---|
Use Scenario: Protects microcontroller power supply inputs from alternator load dump surges during battery disconnection in gasoline/diesel vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping positive transients on 12 V main rail upstream of DC/DC converters and LDOs. Use Value: Limits voltage to ≤59.0 V during 3600 W surges, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies. |
Use Scenario: Shields LIN bus transceivers and sensor interfaces from switching noise and relay-induced spikes in door modules and lighting controls. IC Role / Device Role / Timing Role: Fast-response transient suppressor placed at BCM input connector to absorb repetitive 10/1000 μs pulses. Use Value: Maintains <10 μA leakage at 33 V to avoid loading always-on wake-up circuits while clamping within 1 ns response time. |
| Start-Stop System Battery Interface | Electric Power Steering (EPS) Motor Driver Protection |
Use Scenario: Guards bidirectional DC/DC converter inputs during frequent engine restarts where regenerative braking induces high dv/dt transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on high-side 12 V input rail, coordinated with secondary TVS for multi-level protection. Use Value: Withstands 175 °C junction temperature and passes AEC-Q101 HTGB testing, ensuring reliability across 100,000+ start-stop cycles. |
Use Scenario: Protects gate drivers and current sense amplifiers from inductive kickback when EPS motor phases commutate at high PWM frequencies. IC Role / Device Role / Timing Role: Transient suppressor mounted adjacent to motor driver IC on high-current PCB layer with dedicated thermal pad. Use Value: 1.0 °C/W RθJC allows direct thermal coupling to inner ground plane, sustaining 5 W dissipation without thermal shutdown during repeated surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | DO-214AC package; lower PPPM (400 W); VBR = 36.7–40.6 V; no AEC-Q101 qualification. | Rated for commercial/industrial use only; not validated for automotive temperature cycling or load dump waveforms. | Select SMAJ33A-E3/57T only for cost-sensitive non-automotive applications where 175 °C operation and ISO7637-2 compliance are unnecessary. |
| TPSMD33A | DO-218AB package; same footprint; VBR = 36.7–40.6 V; PPPM = 3000 W (10/1000 μs); AEC-Q101 qualified. | Lower surge rating limits use in high-energy load dump scenarios; suitable for auxiliary 12 V subsystems with lower surge exposure. | Choose TPSMD33A when full 3600 W capability is not required but DO-218AB mechanical compatibility and AEC-Q101 are mandatory. |
Compared with SMAJ33A-E3/57T and TPSMD33A, the SM5S33HE3/2D provides the highest surge power rating (3600 W) in an AEC-Q101-qualified DO-218AB package, making it the preferred choice for primary battery rail protection in modern automotive ECUs where thermal robustness and standardized surge immunity are non-negotiable.
Availability
SM5S33HE3/2D is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and start-stop system power interfaces requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM5S33HE3/2D 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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The SM5S series is part of Vishay's PAR® transient voltage suppressor family, engineered specifically for under-hood automotive environments demanding 175 °C operation, ISO7637-2 compliance, and AEC-Q101 qualification.
FAQ
What is the clamping voltage of the SM5S33HE3/2D at its rated peak pulse current?
The SM5S33HE3/2D has a maximum clamping voltage (VC) of 59.0 V at 61 A peak pulse current under the 10/1000 μs waveform. This value is measured per the conditions specified in the Vishay datasheet document 88382 and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The SM5S33HE3/2D maintains this clamping performance across its full operating temperature range.
Is the SM5S33HE3/2D suitable for 24 V automotive systems?
Yes, the SM5S33HE3/2D is explicitly designed for 24 V automotive systems, with a 33.0 V stand-off voltage (VWM) that provides adequate margin above nominal 24 V rail voltage while remaining below the 36.7 V minimum breakdown threshold. Its AEC-Q101 qualification, 175 °C junction rating, and ISO7637-2 compliance confirm suitability for heavy-duty truck and commercial vehicle applications where higher system voltages and thermal stress are present.
Does the SM5S33HE3/2D have a bidirectional configuration option?
No, the SM5S33HE3/2D is available in uni-directional polarity only, as confirmed in the Vishay datasheet. The device uses a single PN junction optimized for clamping positive transients relative to ground. For bidirectional protection, designers must select a different part number from the SM5SxxA series (e.g., SM5S33AHE3/2D), which offers symmetrical breakdown characteristics but differs in VBR range and clamping behavior.
What is the thermal resistance from junction to case (RθJC) for the SM5S33HE3/2D?
The SM5S33HE3/2D has a typical thermal resistance of 1.0 °C/W from junction to case (RθJC), as specified in the Vishay thermal characteristics table. This low value is enabled by the DO-218AB package's metal heatsink construction and allows efficient heat transfer to the PCB ground plane. Proper layout with ≥100 mm² of 2 oz copper connected to the cathode terminal is required to realize this thermal performance in practice.
How does the SM5S33HE3/2D meet ISO7637-2 requirements?
The SM5S33HE3/2D meets ISO7637-2 surge specification through validated performance under the 10 ms exponential load dump waveform, as documented in Figure 2 of the Vishay datasheet. Its 3600 W peak pulse power rating (10/1000 μs) and 59.0 V clamping voltage ensure compliance across test pulses P1, P2a, P3a, and P5a when implemented with appropriate PCB layout and system-level filtering. Compliance is verified per test condition-not guaranteed for all configurations.
SM5S33HE3/2D 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 61A
- 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-218AB
SM5S33HE3/2D FAQ
1.How can I place an order for SM5S33HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S33HE3/2D 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 SM5S33HE3/2D reliable?
The price and inventory of SM5S33HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S33HE3/2D is usually 5 days.
3.What payment methods are accepted for SM5S33HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S33HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S33HE3/2D?
SM5S33HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S33HE3/2D 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 SM5S33HE3/2D?
For technical support, including SM5S33HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S33HE3/2D requirements.
6.How does Aetrix verify that SM5S33HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S33HE3/2D 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 SM5S33HE3/2D meets industry standards.
7.What is the process for return or replacement of SM5S33HE3/2D?
All SM5S33HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S33HE3/2D, 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 SM5S33HE3/2D part is unused and in its original packaging.
Return procedure for SM5S33HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S33HE3/2D Tags
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