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Vishay General Semiconductor - Diodes Division SMCJ33AHM3_A/H
- Part No.:
- SMCJ33AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33AHM3_A/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,800
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Product details
Overview
SMCJ33AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 33 V standoff voltage (VWM), 53.3 V clamping voltage (VC) at 28.1 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning-induced surges in automotive and industrial power rails.
For engineers reviewing the SMCJ33AHM3_A/H datasheet, SMCJ33AHM3_A/H pinout, SMCJ33AHM3_A/H application, or SMCJ33AHM3_A/H equivalent, this part delivers AEC-Q101 qualified reliability, halogen-free RoHS compliance, and validated clamping performance under 10/1000 µs surge waveforms - critical for ECU power input, CAN bus protection, and DC-DC converter output stages.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 36.7–40.6 V breakdown range (VBR) at 1 mA test current. Its low incremental surge resistance ensures minimal voltage overshoot during transient events, while the glass-passivated junction enables stable operation up to 150 °C junction temperature.
The device uses a single P-N junction structure with cathode-band polarity marking, optimized for fast response (<1 ns) and low capacitance (<100 pF at 1 MHz, zero bias). It meets J-STD-020 MSL Level 1 and withstands 200 A non-repetitive forward surge (IFSM) per 8.3 ms half-sine waveform.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 3.3 V or 5 V logic-supplied systems. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 53.3 V at 28.1 A - Clamped voltage during 10/1000 µs surge; limits downstream component stress below 55 V absolute maximum ratings. |
| PPPM | 1500 W - Peak transient energy handling capacity; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity on 12 V/24 V automotive lines. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood environments without derating in standard PCB layouts. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal footprint per terminal. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
SMCJ33AHM3_A/H is housed in the SMC (DO-214AB) package: a rectangular, surface-mount plastic case with two coplanar leads, matte tin-plated for solderability per J-STD-002. Polarity is marked by a cathode band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; forms return path during clamping conduction. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V battery rail); carries full surge current into ground during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free & RoHS-compliant | HM3 suffix confirms halogen-free molding compound and lead finish - satisfies automotive OEM environmental requirements (e.g., GMW3172, Ford WSS-M99P9999-A1). |
| Low incremental surge resistance | Enables tighter clamping voltage window (VC − VBR ≈ 16.6 V), reducing voltage overshoot on sensitive 3.3 V/5 V logic interfaces. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak - eliminates baking requirements and simplifies SMT assembly planning. |
| Fast response time | <1 ns turn-on latency - suppresses ESD and fast-rising transients before they propagate into microcontroller I/O or analog front-ends. |
| 1500 W peak pulse power | Supports sustained surge immunity in 24 V commercial vehicle systems (e.g., ISO 7637-2 Pulse 5a) without thermal runaway. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12 V supply rail of BCM microcontroller from load-dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery feed and LDO input, conducting only during positive overvoltage events. Use Value: Limits rail voltage to ≤53.3 V during 100 ms, 35 V load-dump pulse - preventing LDO destruction and maintaining MCU reset integrity. |
Use Scenario: Shielding 24 V digital input channel of PLC from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Standoff protector mounted directly at connector entry point, shunting surge energy to chassis ground before optocoupler input stage. Use Value: Maintains <1 µA leakage at 24 V nominal, ensuring clean logic-level detection while clamping 1 kV/500 A transients per IEC 61000-4-5. |
| Automotive Infotainment Power Supply | Telecom Remote Radio Unit (RRU) DC Feed |
Use Scenario: Safeguarding 5 V USB power delivery path in head-unit against hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Secondary-stage TVS located after primary DC-DC converter, acting as final overvoltage barrier before USB controller IC. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) to <55 V within 1 ns - preserving USB PHY functionality without latch-up or data corruption. |
Use Scenario: Protecting 48 V DC power feed to outdoor RRU from lightning-induced surges on tower-mounted telecom infrastructure. IC Role / Device Role / Timing Role: Primary surge diverter installed at RRU power entry board, coordinated with upstream GDT and downstream MOV for staged protection. Use Value: Handles 1500 W peak pulse with 53.3 V clamping - prevents damage to PoE-like DC-DC converters and maintains uptime in harsh RF environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33AHE3_A/H | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR/VC specs. | Not suitable for IEC 61000-4-5 Level 4; limited to low-energy consumer electronics or secondary protection. | Select when space-constrained layout and lower surge threat level allow reduced power rating. |
| SMCJ33AHE3_A/H | Same electrical specs but RoHS-compliant (E3) instead of halogen-free (HM3); no AEC-Q101 qualification. | Lacks automotive qualification evidence; requires additional validation for Tier 1 automotive programs. | Choose for cost-sensitive industrial designs where halogen-free and AEC-Q101 are not mandated. |
Compared with SMAJ33AHE3_A/H and SMCJ33AHE3_A/H, SMCJ33AHM3_A/H uniquely combines 1500 W surge capability, halogen-free construction, and AEC-Q101 qualification - making it the only option qualified for primary surge protection in production automotive ECUs without design revalidation.
Availability
SMCJ33AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom remote radio units requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ33AHM3_A/H 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series was engineered for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, consistency, and qualification compliance are mandatory.
FAQ
What is the clamping voltage of SMCJ33AHM3_A/H at its rated peak pulse current?
The SMCJ33AHM3_A/H has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current (IPPM) of 28.1 A under the standard 10/1000 µs waveform. This value is measured and guaranteed per Vishay's datasheet revision 09-Jan-2024 (Document Number: 88394), and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ33AHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMCJ33AHM3_A/H qualified for automotive applications?
Yes, SMCJ33AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the SMCJ5.0A–SMCJ188CA datasheet. This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD, validating its suitability for under-hood and body electronics in production vehicles. The SMCJ33AHM3_A/H meets automotive environmental and reliability requirements without requiring additional qualification by the end user.
What does the "HM3" suffix indicate in SMCJ33AHM3_A/H?
The "HM3" suffix in SMCJ33AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from "E3" (RoHS only) and "HE3" (RoHS + AEC-Q101) variants. Vishay specifies HM3 parts use halogen-free molding compounds and matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. This makes SMCJ33AHM3_A/H compliant with stringent automotive OEM material declarations such as GMW3172 and Ford WSS-M99P9999-A1.
Can SMCJ33AHM3_A/H be used in bidirectional protection circuits?
No, SMCJ33AHM3_A/H is a unidirectional TVS diode, indicated by the "A" (not "CA") suffix and presence of a cathode band marking. It conducts only during reverse-biased overvoltage events and blocks forward current above ~3.5 V (VF at 100 A). For bidirectional protection - such as AC line or data bus applications - a part with "CA" suffix (e.g., SMCJ33CA) must be selected. Using SMCJ33AHM3_A/H in bidirectional configurations risks failure during positive transients on the anode side.
What is the thermal resistance from junction to ambient for SMCJ33AHM3_A/H?
The typical thermal resistance from junction to ambient (RθJA) for SMCJ33AHM3_A/H is 75 °C/W when mounted on the minimum recommended pad layout (0.31" × 0.31" copper pads per terminal), per Vishay's datasheet. This value assumes still air conditions and defines the steady-state temperature rise above ambient per watt of dissipated power. For reliable long-term operation, average power dissipation should remain well below 6.5 W (PD rating) to avoid exceeding the +150 °C maximum junction temperature.
SMCJ33AHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 28.1A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ33AHM3_A/H FAQ
1.How can I place an order for SMCJ33AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33AHM3_A/H 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 SMCJ33AHM3_A/H reliable?
The price and inventory of SMCJ33AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ33AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33AHM3_A/H?
SMCJ33AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33AHM3_A/H 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 SMCJ33AHM3_A/H?
For technical support, including SMCJ33AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33AHM3_A/H requirements.
6.How does Aetrix verify that SMCJ33AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ33AHM3_A/H 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 SMCJ33AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ33AHM3_A/H?
All SMCJ33AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33AHM3_A/H, 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 SMCJ33AHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ33AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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