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Vishay General Semiconductor - Diodes Division SMBJ33AHM3_A/I
- Part No.:
- SMBJ33AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33AHM3_A/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,132
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Product details
Overview
SMBJ33AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping fast-rising ESD and surge transients on power and signal lines. It features 33 V stand-off voltage (VWM), 53.3 V maximum clamping voltage (VC) at 11.3 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and DC power rail surge suppression.
For engineers reviewing the SMBJ33AHM3_A/I datasheet, SMBJ33AHM3_A/I pinout, SMBJ33AHM3_A/I application, or SMBJ33AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 1.0 µA max reverse leakage at VWM, and thermal resistance of 100 °C/W (junction-to-ambient) under standard PCB pad layout.
Technical Context
This TVS diode operates as a unidirectional clamping device: reverse-biased during normal operation, it remains high-impedance until transient voltage exceeds its breakdown threshold (VBR min = 36.7 V, max = 40.6 V at 1 mA), then rapidly transitions to low-impedance conduction to limit downstream voltage. Its glass-passivated junction ensures stable avalanche characteristics and long-term reliability under repetitive surge stress.
The SMBJ33AHM3_A/I is rated for 150 °C maximum junction temperature, supports 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), and exhibits a positive temperature coefficient of VBR (+0.100 %/°C), enabling predictable voltage shift across operating temperature range (–55 °C to +150 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 33 V nominal DC rails. |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - Breakdown voltage range confirming reliable turn-on above VWM with defined tolerance band. |
| VC @ IPPM | 53.3 V at 11.3 A - Clamped voltage during 600 W surge event; limits downstream IC stress to ≤53.3 V under worst-case transient. |
| PPPM | 600 W - Peak pulse power handling per 10/1000 µs waveform; validates robustness against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | 1.0 µA max - Ultra-low reverse leakage ensures minimal standby power loss and no interference with high-impedance sensor inputs. |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and thermally constrained industrial enclosures. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band marking on one end; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop when transient exceeds VBR. |
| Cathode | High-side connection point | Connected to protected line (e.g., 33 V supply or signal); carries full surge current during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant (HM3) | Meets EU RoHS Directive 2011/65/EU and JEDEC J-STD-208 without brominated flame retardants - supports green manufacturing and export compliance. |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) without degradation. |
| MSL Level 1 (J-STD-020) | Unlimited floor life at ≤30 °C/60 % RH; no bake requirement prior to reflow - simplifies SMT production planning. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients (e.g., ESD >15 kV contact), improving protection margin for sensitive CMOS inputs. |
Applications
| Automotive Sensor Interface | Industrial PLC Digital Input |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and inductive switching spikes in 12 V/24 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between sensor supply line and chassis ground, conducting only during overvoltage events. Use Value: Limits transient voltage to ≤53.3 V, preventing damage to 33 V-rated LDOs and microcontroller I/O pins while maintaining <1.0 µA leakage during normal operation. |
Use Scenario: Safeguarding 24 V DC digital input channels on programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Standoff protector mounted directly at connector entry point, shunting surge energy before reaching optocoupler or Schmitt trigger input stage. Use Value: Delivers 600 W surge handling with 11.3 A peak current capacity, ensuring immunity to IEC 61000-4-4 Level 4 (4 kV) fast transients without derating. |
| DC Power Rail Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Secondary-stage overvoltage protection on regulated 33 V output rails feeding FPGAs, ADCs, or RF modules in base station power supplies. IC Role / Device Role / Timing Role: Parallel-connected TVS providing last-line defense after upstream MOVs or polymeric PTCs, activated within nanoseconds of overvoltage onset. Use Value: Clamps to 53.3 V within <1 ns response time, preserving system uptime by preventing latch-up or gate oxide rupture in downstream silicon. |
Use Scenario: Protecting Ethernet PHY interface power pins and auxiliary bias rails in telecom line cards exposed to lightning-induced surges on AC mains or data lines. IC Role / Device Role / Timing Role: Unidirectional TVS placed on 33 V bias supply to PHY ICs, referenced to local ground plane with minimal trace inductance. Use Value: AEC-Q101 qualification and 150 °C TJ rating ensure sustained performance in sealed, fanless telecom enclosures operating at elevated ambient temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33AHE3_A/I | Same electrical specs (VWM = 33 V, VC = 53.3 V), but RoHS-compliant without halogen-free certification (E3 vs HM3). | Approved for commercial/industrial use; not AEC-Q101 qualified - unsuitable for automotive under-hood deployment. | Select SMBJ33AHE3_A/I only if halogen-free requirement is waived and automotive qualification is unnecessary. |
| SMAJ33A-M3/A | Lower PPPM (400 W), higher VC (59.0 V at 6.8 A), SMA package (smaller footprint, lower thermal mass). | Limited to lower-energy transients; less effective for IEC 61000-4-5 Level 4; requires tighter layout due to reduced surge margin. | Choose SMAJ33A-M3/A only when board space is critical and surge threat level is ≤IEC 61000-4-5 Level 3 (2 kV/1 kA). |
Compared with SMBJ33AHM3_A/I, SMBJ33AHE3_A/I lacks halogen-free assurance and automotive qualification, while SMAJ33A-M3/A trades 33 % peak power capability and higher clamping voltage for smaller size - making SMBJ33AHM3_A/I the optimal choice for AEC-Q101–mandated, high-energy surge environments.
Availability
SMBJ33AHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC input conditioning, and DC power rail surge suppression requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMBJ33AHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial automation, and telecom infrastructure where failure resilience and regulatory compliance are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ33AHM3_A/I at its rated peak pulse current?
The SMBJ33AHM3_A/I has a maximum clamping voltage (VC) of 53.3 V at its specified peak pulse current (IPPM) of 11.3 A, measured using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and confirms the device's ability to limit transient overvoltage to a safe level for downstream 33 V-rated circuitry. The SMBJ33AHM3_A/I maintains this clamping performance under repetitive surge conditions with ≤0.01 % duty cycle.
Is SMBJ33AHM3_A/I suitable for automotive applications?
Yes, SMBJ33AHM3_A/I is AEC-Q101 qualified and designated with the HM3 suffix, indicating halogen-free, RoHS-compliant construction validated for automotive use. It meets rigorous stress tests including temperature cycling, high-temperature reverse bias, and surge endurance - making it appropriate for engine control units, ADAS sensors, and body electronics where reliability under thermal and electrical stress is critical. The SMBJ33AHM3_A/I operates continuously from –55 °C to +150 °C junction temperature.
How does the SMBJ33AHM3_A/I differ from the SMBJ33A-E3 variant?
The SMBJ33AHM3_A/I differs from SMBJ33A-E3 primarily in material composition and qualification: HM3 denotes halogen-free molding compound and AEC-Q101 qualification, whereas E3 is RoHS-compliant but not halogen-free or automotive-qualified. Electrically, both share identical VWM (33 V), VBR (36.7–40.6 V), and VC (53.3 V) specs. The SMBJ33AHM3_A/I is required for automotive Tier 1 suppliers and applications demanding halogen-free compliance per JEDEC J-STD-208.
What is the thermal resistance of SMBJ33AHM3_A/I, and how does it affect PCB layout?
The SMBJ33AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB with no internal copper planes. To maintain safe junction temperature under repeated surges, designers must allocate adequate copper area and avoid excessive trace length between the SMBJ33AHM3_A/I and ground/power planes. Reducing RθJA via thermal vias or larger pads directly improves surge repetition rate capability.
Can SMBJ33AHM3_A/I be used in bidirectional configurations?
No, SMBJ33AHM3_A/I is a unidirectional TVS diode, identifiable by its cathode band marking and specified parameters (e.g., VBR, VC) for reverse-biased operation only. For bidirectional protection, Vishay offers the SMBJ33CA variant (e.g., SMBJ33CHM3_A/I), which provides symmetrical clamping in both polarities. Using SMBJ33AHM3_A/I in bidirectional circuits risks failure during positive-going transients, as it lacks forward conduction capability beyond its 3.5 V max forward voltage at 50 A.
SMBJ33AHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- 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):
- 11.3A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SMBJ33AHM3_A/I FAQ
1.How can I place an order for SMBJ33AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33AHM3_A/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 SMBJ33AHM3_A/I reliable?
The price and inventory of SMBJ33AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ33AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33AHM3_A/I?
SMBJ33AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33AHM3_A/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 SMBJ33AHM3_A/I?
For technical support, including SMBJ33AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ33AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ33AHM3_A/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 SMBJ33AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ33AHM3_A/I?
All SMBJ33AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33AHM3_A/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 SMBJ33AHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ33AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33AHM3_A/I Tags
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