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Vishay General Semiconductor - Diodes Division SM5S33AHE3/2D
- Part No.:
- SM5S33AHE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S33AHE3/2D.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,733
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Product details
Overview
SM5S33AHE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 33.0 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR), 59.0 V clamping voltage at 68 A peak pulse current, 3600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM5S33AHE3/2D datasheet, SM5S33AHE3/2D pinout, SM5S33AHE3/2D application, or SM5S33AHE3/2D equivalent, key selection criteria include unidirectional polarity, DO-218AB package thermal performance (RθJC = 1.0 °C/W), 175 °C junction rating, low leakage (<10 μA at VWM), and ISO7637-2 compliance for automotive transients.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping under high-temperature conditions up to TJ = 175 °C. Its unidirectional configuration and heatsink-anode polarity enable direct integration into DC power rail protection circuits with minimal forward voltage drop (VF ≤ 2.0 V at 100 A).
The device meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing. Its 3600 W surge capability with 10/1000 μs waveform and 2800 W with 10/10000 μs waveform supports robust load dump and inductive switching transient suppression in 12 V and 24 V automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.0 V - Maximum continuous reverse operating voltage before clamping begins; sets threshold for 12 V/24 V system rail protection. |
| VBR min/max | 36.7 V / 40.6 V at 5 mA - Confirmed breakdown range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 59.0 V at 68 A (10/1000 μs) - Clamping voltage limits downstream IC stress during ISO7637-2 load dump events. |
| PPPM | 3600 W (10/1000 μs) - Enables single-device handling of high-energy automotive surges without cascaded protection. |
| TJ max | 175 °C - Supports placement near hot engine control units with no derating required up to case temperature. |
| IFSM | 500 A (8.3 ms half-sine) - Withstands repeated cranking surges and alternator field decay currents. |
| RθJC | 1.0 °C/W - Enables efficient heat transfer to PCB copper or external heatsink, critical for sustained power dissipation. |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with matte tin-plated leads, UL 94 V-0 rated compound, anode connected to metal heatsink tab (Lead 2), cathode at Lead 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit's positive rail; reverse-biased during normal operation; conducts during overvoltage. |
| Lead 2 / Metal Heatsink | Anode | Must be soldered to large copper pour or external heatsink; serves as primary thermal path and electrical return. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock per stress test requirements. |
| Junction passivation | Reduces long-term parameter drift and leakage growth under high-temperature bias, ensuring 15+ year reliability in engine control modules. |
| Low leakage current | <10 μA at 33.0 V and 25 °C - Minimizes standby power loss in always-on vehicle networks (e.g., CAN/LIN gateways). |
| ISO7637-2 compliance | Tested per Pulse 5a (load dump) with 10 ms exponential waveform - meets OEM-level surge immunity requirements without external filtering. |
| MSL Level 1 | Rated for reflow up to 245 °C peak - compatible with standard lead-free SMT assembly without moisture sensitivity concerns. |
Applications
| Engine Control Unit (ECU) Power Protection | Body Control Module (BCM) Input Protection |
|---|---|
Use Scenario: Protects 5 V and 3.3 V LDO regulators and microcontrollers from alternator load dump spikes on 12 V supply rails. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and first-stage filter capacitor; clamps within nanoseconds to limit voltage to <59.0 V. Use Value: Prevents latch-up or permanent damage to MCU power domains during cold-cranking and load dump events per ISO7637-2. |
Use Scenario: Shields LIN bus transceivers and door module drivers from inductive switching transients generated by window lift motors and solenoids. IC Role / Device Role / Timing Role: Mounted at BCM main power entry point; absorbs repetitive 100 A/10 ms pulses without degradation. Use Value: Eliminates need for additional RC snubbers or varistors, reducing BOM count and board space in compact body electronics. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Rail | Electric Power Steering (EPS) Motor Driver Protection |
Use Scenario: Secures 12 V input to image sensor SoCs and ISP processors in front-facing cameras exposed to under-hood thermal stress. IC Role / Device Role / Timing Role: TVS with 175 °C TJ rating mounted directly adjacent to camera module power connector; operates continuously at 125 °C ambient. Use Value: Maintains clamping performance stability across full automotive temperature range, avoiding false resets or image corruption. |
Use Scenario: Guards H-bridge gate drivers and current sense amplifiers against back-EMF from 3-phase EPS motor commutation. IC Role / Device Role / Timing Role: Placed across motor phase inputs; clamps negative voltage excursions during PWM dead-time transitions. Use Value: Reduces gate oxide stress on MOSFET drivers and prevents ADC saturation in torque feedback loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ33A | Same VWM (33 V), but lower PPPM = 400 W (10/1000 μs); DO-214AC package; RθJC = 35 °C/W. | Not suitable for ISO7637-2 load dump; limited to low-energy ESD and inductive spike suppression. | Select only for non-automotive industrial controls where surge energy is <500 W. |
| ON Semiconductor 1.5SMC33A | Same VWM/VBR, but PPPM = 1500 W; DO-214AB package; TJ max = 150 °C; not AEC-Q101 qualified. | Requires derating above 125 °C ambient; unsuitable for under-hood deployment without thermal margin analysis. | Acceptable for cabin-mounted modules with controlled thermal environment and lower surge severity. |
Compared with SMAJ33A and 1.5SMC33A, the SM5S33AHE3/2D delivers 2.4× higher surge power handling, 25 °C higher junction temperature capability, and automotive-grade qualification-making it the only option for direct load dump protection in engine bay ECUs without supplemental components.
Availability
SM5S33AHE3/2D is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power supplies, and electric power steering systems requiring stable component supply across extended product lifecycles.
Supply support for SM5S33AHE3/2D 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 SM5SxxA series is part of Vishay's PAR® TVS platform engineered specifically for automotive-grade transient suppression-emphasizing high-temperature stability, AEC-Q101 compliance, and ISO7637-2 load dump resilience.
FAQ
What is the polarity configuration of the SM5S33AHE3/2D?
The SM5S33AHE3/2D is a unidirectional TVS diode with anode connected to the metal heatsink tab (Lead 2) and cathode at Lead 1. This configuration allows it to clamp only negative-going transients on positive rails, making it ideal for protecting 12 V and 24 V automotive power inputs where reverse voltage is not expected. The heatsink must be electrically tied to the system ground or low-impedance return path to ensure proper clamping behavior.
Does the SM5S33AHE3/2D meet ISO7637-2 Pulse 5a requirements?
Yes, the SM5S33AHE3/2D is explicitly validated to meet ISO7637-2 Pulse 5a (load dump) requirements per the Vishay datasheet Document Number 88382. Its 3600 W peak pulse power rating with 10/1000 μs waveform and 59.0 V clamping voltage at 68 A enables direct compliance without external series impedance or filtering components when properly mounted on adequate copper area.
What is the maximum continuous power dissipation of the SM5S33AHE3/2D?
The SM5S33AHE3/2D has a maximum steady-state power dissipation (PD) of 5.0 W when mounted on an infinite heatsink at TC = 25 °C. In real-world PCB layouts, derating is required based on copper area and airflow; the device's RθJC = 1.0 °C/W allows accurate thermal modeling when the heatsink tab is soldered to ≥250 mm² of 2 oz copper.
Is the SM5S33AHE3/2D RoHS-compliant and halogen-free?
Yes, the SM5S33AHE3/2D carries the HE3 suffix, which indicates full RoHS compliance per Directive 2011/65/EU and halogen-free status per IEC 61249-2-21. The molding compound meets UL 94 V-0 flammability rating, and the matte tin-plated leads comply with J-STD-002 and JESD22-B102 solderability standards.
How does the SM5S33AHE3/2D differ from the SM5S33HE3/2D?
The SM5S33AHE3/2D has a tighter breakdown voltage tolerance (36.7–40.6 V) versus the SM5S33HE3/2D (36.7–44.9 V), resulting in more consistent clamping onset and reduced risk of premature conduction in precision 12 V systems. Both share identical package, power ratings, and AEC-Q101 qualification-but the "A" variant is preferred for safety-critical automotive applications demanding tighter parametric control.
SM5S33AHE3/2D 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:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 68A
- 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
SM5S33AHE3/2D FAQ
1.How can I place an order for SM5S33AHE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S33AHE3/2D 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 SM5S33AHE3/2D reliable?
The price and inventory of SM5S33AHE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S33AHE3/2D is usually 5 days.
3.What payment methods are accepted for SM5S33AHE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S33AHE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S33AHE3/2D?
SM5S33AHE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S33AHE3/2D 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 SM5S33AHE3/2D?
For technical support, including SM5S33AHE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S33AHE3/2D requirements.
6.How does Aetrix verify that SM5S33AHE3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S33AHE3/2D 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 SM5S33AHE3/2D meets industry standards.
7.What is the process for return or replacement of SM5S33AHE3/2D?
All SM5S33AHE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S33AHE3/2D, 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 SM5S33AHE3/2D part is unused and in its original packaging.
Return procedure for SM5S33AHE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S33AHE3/2D Tags
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