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Vishay General Semiconductor - Diodes Division SMBJ33AHM3/I
- Part No.:
- SMBJ33AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33AHM3/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,932
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Product details
Overview
SMBJ33AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V clamping voltage (VC) at 11.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives, automotive body control modules, and industrial sensor interfaces.
For engineers reviewing the SMBJ33AHM3/I datasheet, SMBJ33AHM3/I pinout, SMBJ33AHM3/I application, or SMBJ33AHM3/I equivalent, this page delivers verified electrical specs, thermal derating behavior, clamping performance under surge conditions, AEC-Q101 qualification status, and halogen-free RoHS-compliant sourcing details - all critical for ESD/surge protection design validation and long-term supply assurance.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 33 V, it avalanches to limit transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad layout per JEDEC standards.
The device sustains 100 A non-repetitive forward surge current (IFSM) and exhibits a +0.100 %/°C temperature coefficient of VBR, enabling predictable clamping shift across -55 °C to +150 °C operating range. It meets MSL Level 1 per J-STD-020 and is halogen-free, RoHS-compliant, and AEC-Q101 qualified - confirmed by HM3 suffix and ordering code "I" denoting 13" tape-and-reel packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before avalanche conduction begins; defines safe DC rail margin for 3.3 V/5 V/12 V/24 V systems. |
| VBR @ IT = 1 mA | 36.7–40.6 V - guaranteed breakdown range ensuring reliable turn-on during transients without premature conduction. |
| VC @ IPPM = 11.3 A | 53.3 V - clamped voltage during 10/1000 µs surge; determines maximum stress on downstream ICs like microcontrollers or CAN transceivers. |
| PPPM | 600 W - peak pulse power handling capacity; enables protection against IEC 61000-4-5 Level 3 (1 kV/2 kV) surges on industrial lines. |
| IFSM | 100 A - 8.3 ms half-sine surge current rating; supports protection against inductive switching events in relay or solenoid drivers. |
| TJ max. | +150 °C - maximum junction temperature; allows operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - standardized 2-pin SMD outline with cathode band marking; compatible with automated pick-and-place and reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, 2-terminal device with molded plastic case meeting UL 94 V-0 flammability rating. Matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards. Polarity indicated by cathode band on unidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to protected line (e.g., 33 V rail); forms low-impedance path to ground during overvoltage events. |
| Cathode | Reverse-biased terminal / Clamping output node | Connected to system ground; establishes precise VBR threshold and defines clamping voltage VC relative to ground. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 surges up to 1 kV open-circuit voltage on 2 Ω source impedance. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including BCM, lighting control, and infotainment power rails with zero early-life failure risk. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green electronics manufacturing. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., EFT bursts), improving protection margin for 3.3 V logic interfaces. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without moisture sensitivity concerns - no baking required prior to assembly. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 24 V DC bus against inductive kickback from brushed DC motor commutation and relay coil de-energization. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between motor driver output and chassis ground to clamp transients ≤ 53.3 V. Use Value: Prevents latch-up or gate oxide damage in MOSFET half-bridges by limiting voltage spikes to within 120 % of nominal rail. |
Use Scenario: Surge suppression on LIN bus power line and window lift actuator control inputs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply rail feeding microcontroller and driver ICs in door module assemblies. Use Value: Maintains functional safety integrity per ISO 16750-2 by surviving 12 V load dump pulses (14 V → 35 V, 400 ms) without degradation. |
| Industrial Sensor Interfaces | Telecom Power Feeds |
|
Use Scenario: Input protection for 4–20 mA current loop transmitters connected to PLC analog input cards in factory automation. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 33 V) placed across loop supply terminals to absorb induced lightning surges on long field wiring. Use Value: Ensures <1 µA leakage at 33 V, preserving loop accuracy while clamping 1 kV/500 A transients to <54 V at sensor IC pins. |
Use Scenario: Secondary protection on -48 V DC telecom power distribution boards upstream of DC/DC converters and PoE controllers. IC Role / Device Role / Timing Role: High-energy clamping device absorbing repetitive surges from AC line coupling and grounding faults in central office equipment. Use Value: Delivers 600 W pulse handling with <0.1 % duty cycle tolerance, extending converter lifetime under frequent transient exposure. |
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/I | Same electrical specs and SMB package; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Approved for commercial/industrial use only; unsuitable for automotive production where halogen-free and AEC-Q101 are mandatory. | Select SMBJ33AHE3/I only if halogen content and automotive qualification are not required - lower cost alternative for non-automotive designs. |
| SMAJ33A-M3/5B | Lower 400 W PPPM; SMA (DO-214AC) package with smaller footprint and higher RθJA (140 °C/W); same VWM/VC ratings. | Limited to lower-energy transients (IEC 61000-4-5 Level 2); less thermal margin in high-ambient or high-duty-cycle scenarios. | Choose SMAJ33A-M3/5B only for space-constrained consumer or low-power industrial designs where 600 W headroom is unnecessary. |
Compared with SMBJ33AHE3/I and SMAJ33A-M3/5B, SMBJ33AHM3/I uniquely combines AEC-Q101 qualification, halogen-free construction, and full 600 W surge capability in the SMB footprint - making it the only option qualified for automotive-grade 24 V systems requiring both reliability and regulatory compliance.
Availability
SMBJ33AHM3/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMBJ33AHM3/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, power efficiency, and automotive-grade validation.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping performance and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ33AHM3/I at its rated peak pulse current?
The SMBJ33AHM3/I has a maximum clamping voltage (VC) of 53.3 V at 11.3 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ33AHM3/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), with minimal variation due to its +0.100 %/°C VBR temperature coefficient.
Is SMBJ33AHM3/I qualified for automotive applications?
Yes, SMBJ33AHM3/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix and ordering code "I" in its full part number. This qualification covers stress testing for high-temperature operating life, temperature cycling, humidity bias, and mechanical shock - validating its suitability for under-hood and cabin-mounted automotive electronics. The SMBJ33AHM3/I is specifically approved for use in body control modules, lighting drivers, and sensor interface circuits where sustained reliability under thermal and electrical stress is required.
What does the "HM3" suffix indicate in SMBJ33AHM3/I?
The "HM3" suffix in SMBJ33AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. "H" identifies the halogen-free variant, "M3" specifies the RoHS-compliant commercial grade with JESD 201 Class 2 whisker resistance, and the trailing "I" indicates packaging in 13" diameter tape-and-reel (3200 units per reel). This distinguishes SMBJ33AHM3/I from non-automotive variants like SMBJ33A-E3/52 (RoHS only) or SMBJ33AHE3/I (AEC-Q101 but not halogen-free).
How does SMBJ33AHM3/I compare to bidirectional TVS diodes like SMBJ33CA?
SMBJ33AHM3/I is unidirectional and intended for DC line protection with polarity-sensitive placement (cathode to ground), whereas SMBJ33CA is bidirectional and used in AC or floating signal paths. The SMBJ33AHM3/I offers lower leakage (<1.0 µA at 33 V) and higher surge current capability in DC configurations, while SMBJ33CA provides symmetrical clamping in both directions but with doubled ID limit per note (3) in the datasheet. For 33 V DC rails - such as those in automotive ECUs or industrial PLCs - SMBJ33AHM3/I is the appropriate choice due to its optimized unidirectional response and AEC-Q101 validation.
What PCB layout guidance applies to SMBJ33AHM3/I for optimal thermal performance?
For optimal thermal performance, SMBJ33AHM3/I should be mounted on minimum 0.2" x 0.2" (5.0 mm x 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet Figure 2 derating curves. These pads reduce thermal resistance (RθJA = 100 °C/W) and prevent junction overheating during repetitive surges. Avoid narrow traces between the SMBJ33AHM3/I and ground plane; use multiple vias to inner-layer ground planes to enhance heat dissipation. The device's MSL Level 1 rating permits standard reflow without pre-baking, but thermal relief patterns must still follow IPC-7351B for DO-214AA footprints.
SMBJ33AHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMBJ33AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33AHM3/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/I reliable?
The price and inventory of SMBJ33AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ33AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33AHM3/I?
SMBJ33AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33AHM3/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/I?
For technical support, including SMBJ33AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33AHM3/I requirements.
6.How does Aetrix verify that SMBJ33AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ33AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ33AHM3/I?
All SMBJ33AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33AHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ33AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33AHM3/I Tags
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