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Vishay General Semiconductor - Diodes Division SMBJ33AHM3_B/I
- Part No.:
- SMBJ33AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33AHM3_B/I.pdf
- Description:
- 600W,33V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,210
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Product details
Overview
SMBJ33AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping inductive switching transients and lightning-induced surges on power rails and signal lines. It features 33 V standoff voltage (VWM), 53.3 V maximum clamping voltage (VC) at 11.3 A peak pulse current (IPPM), 600 W peak pulse power (10/1000 µs), and operates across -55 °C to +150 °C junction temperature range - deployed in industrial sensor interfaces and automotive power supply protection.
For engineers reviewing the SMBJ33AHM3_B/I datasheet, SMBJ33AHM3_B/I pinout, SMBJ33AHM3_B/I application, or SMBJ33AHM3_B/I equivalent, this page delivers verified electrical parameters, thermal derating behavior, AEC-Q101 qualification status, clamping performance under standardized surge waveforms, and halogen-free RoHS-compliant sourcing details specific to the HM3_B/I ordering variant.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ps) to transient overvoltages, with low incremental surge resistance ensuring stable clamping during repetitive 10/1000 µs pulses at 0.01% duty cycle. Its unidirectional polarity enables cathode-referenced protection on DC-biased lines without reverse conduction path concerns.
The device is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and exhibits a VBR breakdown range of 36.7–40.6 V at 1 mA test current, with ±0.100 %/°C temperature coefficient - enabling predictable voltage margining across automotive and industrial ambient ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - maximum continuous reverse operating voltage before clamping initiates; sets minimum system rail margin. |
| VC (Clamping Voltage) | 53.3 V at IPPM = 11.3 A - peak voltage seen by protected circuit during 600 W transient; defines safe IC stress limit. |
| PPPM (Peak Pulse Power) | 600 W (10/1000 µs waveform) - surge energy handling capacity; validates robustness against IEC 61000-4-5 Level 4 surges. |
| TJmax | +150 °C - maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs PCB thermal layout requirements. |
| AEC-Q101 Qualified | Yes - certified for automotive electronic modules per stress test standard; required for powertrain and body control units. |
| Halogen-Free / RoHS | Yes - HM3 suffix denotes halogen-free molding compound and full RoHS compliance per JEDEC JESD201 Class 2. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; completes clamping loop during positive transients. |
| Cathode | Protected line connection / clamping reference | Connected to line being protected (e.g., 33 V rail); reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 4 kV surge events on 24–48 V industrial buses without parallel staging. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage overshoot during fast transients, reducing risk of gate oxide damage in downstream MOSFETs or ICs. |
| AEC-Q101 qualified (HM3 variant) | Validates reliability for automotive applications including engine control modules and ADAS power supplies where field failure is unacceptable. |
| MSL Level 1 (260 °C reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| Halogen-free construction | Meets automotive OEM environmental mandates (e.g., GMW3172, Ford WSS-M99P9999-A1) and simplifies end-of-life recycling compliance. |
Applications
| Industrial Sensor Interface Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
|
Use Scenario: Protecting 3.3 V or 5 V analog sensor signal lines (e.g., pressure, temperature) from ESD and cable discharge events in factory automation PLCs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground, clamping transients before they reach ADC input or op-amp front-end. Use Value: Limits induced voltage to ≤53.3 V during 11.3 A surge, preventing latch-up or permanent damage to precision analog components. |
Use Scenario: Safeguarding 12 V supply inputs to BCM microcontrollers and CAN transceivers against load dump and alternator ripple spikes. IC Role / Device Role / Timing Role: Mounted directly at power entry point, shunting surge current away from LDO regulators and digital logic. Use Value: Withstands 100 A 8.3 ms forward surge (IFSM), meeting ISO 7637-2 Pulse 5a requirements for automotive battery line protection. |
| Telecom PoE Midspan Surge Protection | Consumer Appliance Motor Drive Power Stage |
|
Use Scenario: Clamping induced transients on IEEE 802.3af/at Power over Ethernet (PoE) data pairs during lightning-induced coupling in outdoor access points. IC Role / Device Role / Timing Role: Bidirectional-capable family member (though SMBJ33AHM3_B/I is unidirectional, used in DC-biased PoE+ midspan outputs). Use Value: 600 W rating handles combined common-mode and differential-mode surges up to 100 V without degradation over 100,000 event cycles. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in smart home appliances (e.g., washing machine drive circuits). IC Role / Device Role / Timing Role: Placed across motor terminals or H-bridge freewheeling paths to clamp flyback voltage spikes. Use Value: Fast <1 ps response time prevents MOSFET avalanche failure during rapid turn-off; 150 °C TJmax accommodates enclosed thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33AHE3_B/I | Same electrical specs, but RoHS-compliant with brominated flame retardant (non-halogen-free); MSL Level 1, same SMB package. | Acceptable for commercial/industrial use where halogen-free mandate does not apply; not approved for automotive OEMs requiring HM3. | Select HE3_B/I when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not mandated. |
| SAC33 | Lower 33 W peak power (vs. 600 W); 33 V VWM, but clamps at 53 V only up to ~1.5 A; smaller SOD-323 package. | Limited to low-energy ESD (IEC 61000-4-2) on signal lines; unsuitable for IEC 61000-4-5 or load-dump protection. | Choose SAC33 only for space-constrained board-level ESD protection on USB or I²C lines - not a functional replacement for SMBJ33AHM3_B/I. |
Compared with SMBJ33AHE3_B/I, the SMBJ33AHM3_B/I adds halogen-free compliance and AEC-Q101 qualification without sacrificing clamping performance or package compatibility; versus SAC33, it delivers 18× higher surge power handling and is intended for system-level rather than component-level protection.
Availability
SMBJ33AHM3_B/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, telecom PoE midspans, and consumer appliance motor drives requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ33AHM3_B/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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where surge immunity and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ33AHM3_B/I at its rated peak pulse current?
The SMBJ33AHM3_B/I has a maximum clamping voltage (VC) of 53.3 V at 11.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events - a key parameter for validating safe operating margins of downstream ICs and MOSFETs in the SMBJ33AHM3_B/I-protected design.
Is SMBJ33AHM3_B/I suitable for automotive applications?
Yes, SMBJ33AHM3_B/I is AEC-Q101 qualified and carries the HM3 suffix denoting halogen-free, RoHS-compliant construction validated for automotive use. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and surge endurance - making it appropriate for body control modules, infotainment power supplies, and ADAS subsystems where SMBJ33AHM3_B/I provides certified transient immunity without derating.
How does the SMBJ33AHM3_B/I differ from the SMBJ33A-E3 variant?
The SMBJ33AHM3_B/I differs from SMBJ33A-E3 primarily in material composition and qualification: HM3 indicates halogen-free molding compound and AEC-Q101 certification, while E3 denotes standard RoHS compliance without halogen-free assurance or automotive qualification. Both share identical electrical specs and SMB (DO-214AA) package, but SMBJ33AHM3_B/I is required for Tier 1 automotive designs mandating HM3-level environmental and reliability compliance.
What is the thermal resistance of SMBJ33AHM3_B/I, and how does it affect PCB layout?
SMBJ33AHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal copper area; increasing pad size or adding internal ground planes reduces RθJA, improving surge survivability. For repeated surge events, PCB layout must ensure adequate copper mass to avoid exceeding +150 °C junction temperature - a critical constraint reflected in SMBJ33AHM3_B/I's derating curve (Fig. 2).
Can SMBJ33AHM3_B/I be used in bidirectional protection configurations?
No - SMBJ33AHM3_B/I is a unidirectional TVS diode, identified by the "A" suffix and cathode band marking. Bidirectional operation requires the "CA" suffix (e.g., SMBJ33CA). Using SMBJ33AHM3_B/I in reverse-biased AC or floating signal paths risks catastrophic failure due to lack of reverse breakdown symmetry; always verify polarity alignment in schematic and layout to ensure correct SMBJ33AHM3_B/I orientation relative to protected line DC bias.
SMBJ33AHM3_B/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:
- 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):
- 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_B/I FAQ
1.How can I place an order for SMBJ33AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33AHM3_B/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_B/I reliable?
The price and inventory of SMBJ33AHM3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ33AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33AHM3_B/I?
SMBJ33AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33AHM3_B/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_B/I?
For technical support, including SMBJ33AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ33AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ33AHM3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ33AHM3_B/I?
All SMBJ33AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33AHM3_B/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_B/I part is unused and in its original packaging.
Return procedure for SMBJ33AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33AHM3_B/I Tags
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