My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM5S33ATHE3/I
- Part No.:
- SM5S33ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM5S33ATHE3/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,389
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM5S33ATHE3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) in DO-218AC package, rated for 33 V stand-off voltage (VWM), 38.7 V nominal breakdown (VBR), 53.3 V clamping voltage (VC) at 150 A peak pulse current, and 3600 W peak pulse power (10/1000 µs). It delivers automotive-grade surge protection for load dump events in 12 V systems.
For engineers reviewing the SM5S33ATHE3/I datasheet, SM5S33ATHE3/I pinout, SM5S33ATHE3/I application, or SM5S33ATHE3/I equivalent, this device requires attention to heatsink-anode polarity, TJ = 175 °C operation, ISO7637-2 compliance, AEC-Q101 qualification status, and DO-218AC thermal mounting constraints.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with junction passivation optimized for high-temperature reliability. Its unidirectional architecture provides low forward voltage drop (≤2.0 V at 100 A) and low leakage (<10 µA at VWM, 25 °C), enabling stable clamping during repetitive transients.
Designed for automotive load dump protection, it meets ISO7637-2 test conditions and supports MSL Level 1 reflow (245 °C peak). Thermal resistance is RθJC = 1.0 °C/W, and its metal heatsink terminal serves as the anode - critical for PCB layout and thermal path design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (nom) | 38.7 V - nominal breakdown voltage at 5 mA test current, defining turn-on threshold |
| VC @ IPPM | 53.3 V - clamping voltage at 150 A (10/1000 µs), limiting downstream voltage stress |
| PPPM (10/1000 µs) | 3600 W - peak transient power handling capability under standard surge waveform |
| TJ max | +175 °C - maximum junction temperature, enabling under-hood automotive deployment |
| Polarity | Unidirectional - conducts only in forward direction; heatsink is anode terminal |
| RθJC | 1.0 °C/W - thermal resistance from junction to case, guiding heatsink sizing and thermal interface design |
Pinout & Package
Package: DO-218AC - surface-mount, thermally enhanced plastic case with integral metal heatsink; RoHS-compliant, AEC-Q101 qualified (HE3 suffix), MSL Level 1, JESD 201 Class 2 whisker tested.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Standard cathode connection; reverse-biased during clamping; routed to protected circuit node |
| Lead 2 / Metal Heatsink | Anode | Primary thermal and electrical anode terminal; must be connected to system ground or low-impedance return path for effective clamping and heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable VBR drift and low leakage over lifetime and temperature cycling (αT = 0.091 %/°C) |
| TJ = 175 °C capability | Supports placement near hot engine compartments without derating or failure risk |
| Meets ISO7637-2 surge specification | Validated for automotive load dump waveforms (10 ms exponential), not just generic transients |
| Low forward voltage drop (≤2.0 V @ 100 A) | Minimizes conduction loss and self-heating during high-current clamping events |
| MSL Level 1, 245 °C peak reflow | Permits standard SMT assembly without moisture sensitivity concerns or baking requirements |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Input Protection |
|---|---|
Use Scenario: Protecting 12 V vehicle electronics against alternator load dump surges up to 35 V sustained for 400 ms. IC Role / Device Role / Timing Role: Unidirectional TVS placed at main power input of ECU or body control module. Use Value: Clamps transient to ≤53.3 V while absorbing 3600 W, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: Safeguarding low-voltage analog sensor inputs (e.g., MAP, TPS) from coupled switching noise and inductive kickback. IC Role / Device Role / Timing Role: Local TVS mounted adjacent to connector or IC input pins. Use Value: Low leakage (<10 µA at 33 V) avoids signal offset; fast response ensures sub-ns clamping before sensitive front-end amplifiers saturate. |
| Power Distribution Module (PDM) Protection | Start-Stop System Battery Interface |
Use Scenario: Shielding fused power distribution nodes from battery reversal and cranking transients in multi-fuse boxes. IC Role / Device Role / Timing Role: High-power TVS on main feed lines upstream of individual fuse outputs. Use Value: 500 A IFSM rating withstands repeated cold-cranking pulses; DO-218AC metal heatsink enables direct mounting to chassis ground. | Use Scenario: Securing bidirectional 12 V bus between AGM battery and start-stop controller during regenerative braking and restart events. IC Role / Device Role / Timing Role: Unidirectional TVS on battery-side input to prevent reverse conduction during negative transients. Use Value: AEC-Q101 qualification and TJ = 175 °C rating ensure reliability across wide ambient range (-40 to +125 °C case temp). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM5S33AHM3 | Same VWM/VBR/VC ratings and DO-218AC package; HM3 suffix indicates halogen-free, matte tin-plated leads per JESD 201 Class 2, but not AEC-Q101 qualified | Not approved for automotive safety-critical modules requiring AEC-Q101 certification | Select when halogen-free compliance is mandatory and AEC-Q101 is not required |
| SMAJ33A | Lower PPPM (400 W), SMA package (RθJC ≈ 45 °C/W), no AEC-Q101 qualification, higher VC (53.3 V → 58.1 V at same IPPM) | Limited to non-automotive or low-energy transient environments; unsuitable for load dump | Use only for cost-sensitive industrial applications with lower surge exposure |
Compared with SM5S33ATHE3/I, SM5S33AHM3 offers identical electrical performance and packaging but lacks AEC-Q101 qualification, while SMAJ33A provides significantly lower surge capacity and thermal performance - making SM5S33ATHE3/I the only choice for validated automotive load dump protection.
Availability
SM5S33ATHE3/I is available at Aetrix Electronics and suitable for automotive electronic control units, power distribution modules, and start-stop system interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SM5S33ATHE3/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 diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, thermal performance, and automotive qualification.
The SM5SxAT family was engineered specifically for high-energy automotive load dump protection, combining DO-218AC thermal efficiency with AEC-Q101 validation and ISO7637-2 compliance.
FAQ
Is SM5S33ATHE3/I AEC-Q101 qualified?
Yes, SM5S33ATHE3/I is AEC-Q101 qualified. The HE3 suffix explicitly denotes RoHS-compliant, AEC-Q101 qualified construction per the Vishay datasheet (Document Number: 87609, Revision: 21-Mar-2024). This qualification covers temperature cycling, humidity testing, and surge robustness required for automotive under-hood applications.
What is the polarity configuration of SM5S33ATHE3/I?
SM5S33ATHE3/I is unidirectional, with the metal heatsink serving as the anode and Lead 1 as the cathode. This configuration must be observed during PCB layout - reversing polarity will prevent proper clamping and may cause catastrophic failure during surge events.
Does SM5S33ATHE3/I meet ISO7637-2 requirements?
Yes, SM5S33ATHE3/I meets ISO7637-2 surge specification under defined test conditions, including the 10 ms exponential load dump waveform. Figure 2 in the official datasheet confirms its load dump power capability across case temperature, validating suitability for automotive 12 V system protection.
What is the thermal resistance and recommended mounting method for SM5S33ATHE3/I?
The typical thermal resistance junction-to-case (RθJC) of SM5S33ATHE3/I is 1.0 °C/W. To achieve rated power dissipation, the metal heatsink (anode) must be soldered to a large copper area or directly to a chassis ground plane - not isolated traces - ensuring low-impedance thermal and electrical paths.
Why is SM5S33ATHE3/I marked "Not For New Designs"?
SM5S33ATHE3/I is marked "Not For New Designs" because Vishay recommends the newer SM5S33AHM3 variant for new projects. However, SM5S33ATHE3/I remains fully supported, in active production, and available for legacy program continuity and existing qualified designs requiring AEC-Q101 compliance.
SM5S33ATHE3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- 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-218AC
SM5S33ATHE3/I FAQ
1.How can I place an order for SM5S33ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S33ATHE3/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 SM5S33ATHE3/I reliable?
The price and inventory of SM5S33ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S33ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM5S33ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S33ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S33ATHE3/I?
SM5S33ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S33ATHE3/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 SM5S33ATHE3/I?
For technical support, including SM5S33ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S33ATHE3/I requirements.
6.How does Aetrix verify that SM5S33ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM5S33ATHE3/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 SM5S33ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM5S33ATHE3/I?
All SM5S33ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S33ATHE3/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 SM5S33ATHE3/I part is unused and in its original packaging.
Return procedure for SM5S33ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S33ATHE3/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 …
