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Vishay General Semiconductor - Diodes Division SMBJ33AHE3/5B
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- Part No.:
- SMBJ33AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33AHE3/5B.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,832
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Product details
Overview
SMBJ33AHE3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the 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, and clamps transients to ≤53.3 V at 11.3 A peak pulse current (IPPM) under 10/1000 µs waveform - deployed in automotive power supply inputs, industrial sensor interfaces, and telecom line protection.
For engineers reviewing the SMBJ33AHE3/5B datasheet, SMBJ33AHE3/5B pinout, SMBJ33AHE3/5B application, or SMBJ33AHE3/5B equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), clamping performance, and direct alternative part comparisons - all grounded in Vishay's official 88392 specification document dated 09-Jan-2024.
Technical Context
The SMBJ33AHE3/5B operates as a unidirectional avalanche diode with cathode-band polarity marking, optimized for fast response (<1 ps) to ESD and lightning-induced surges. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and low incremental surge resistance, enabling precise clamping without thermal runaway during repetitive 600 W pulses (10/1000 µs, 0.01% duty cycle).
Rated for -55 °C to +150 °C junction temperature, it meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak. The AEC-Q101 qualification (denoted by HE3 suffix) confirms suitability for automotive electronics where reliability under thermal cycling and vibration is mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - maximum continuous reverse operating voltage before significant leakage begins; defines safe DC rail margin. |
| VBR (Breakdown Voltage) | 36.7–40.6 V at IT = 1 mA - guaranteed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | ≤53.3 V at IPPM = 11.3 A - peak voltage seen by protected circuit during worst-case 600 W transient; determines downstream IC survivability. |
| PPPM (Peak Pulse Power) | 600 W - maximum non-repetitive surge energy absorption capability under standardized 10/1000 µs waveform. |
| IPPM (Peak Pulse Current) | 11.3 A - peak current the device safely shunts during 600 W transient; directly derived from VC and PPPM. |
| RθJA (Junction-to-Ambient) | 100 °C/W - thermal resistance on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
| TJmax | +150 °C - maximum allowable junction temperature; enables operation in under-hood automotive environments. |
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. Cathode identified by band marking on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected circuit ground or low-side return path. | Provides low forward voltage drop (VF ≤ 3.5 V at 50 A) during surge conduction; anchors clamp reference. |
| Cathode | Current exit point in reverse-biased protection mode; connected to line being protected (e.g., 33 V rail). | Defines polarity-sensitive placement; must be tied to higher-potential node to enable avalanche clamping when VIN exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, mechanical shock, and humidity testing - required for engine control units and ADAS power supplies. |
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without external series impedance in many 33 V systems. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on downstream components - critical for safeguarding 36 V-rated CAN transceivers or microcontrollers with 40 V absolute max ratings. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies SMT manufacturing for high-volume automotive PCB assembly. |
| Glass-passivated junction | Ensures long-term stability of leakage current (<1.0 µA) and breakdown voltage across temperature and lifetime - essential for safety-critical monitoring circuits. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 33 V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp positive-going surges above 33 V. Use Value: Limits peak voltage to ≤53.3 V, preventing damage to 40 V-rated DC-DC converters and MCU power pins while maintaining system uptime. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and inductive switching noise in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector interface to divert sub-100 ns ESD events before reaching precision DAC or op-amp inputs. Use Value: Sub-1 ps response time and <1.0 µA leakage preserve signal integrity and measurement accuracy without loading the 250 Ω loop resistor. |
| Telecom DC Power Feeds | Consumer Power Adapter Output Protection |
|
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras) from induced surges on 33–48 V DC distribution lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on midspan injector output, coordinated with upstream current limiting. Use Value: Withstands repeated 600 W surges per IEEE 802.3bt requirements while maintaining <100 ppm/year parameter drift due to glass passivation. |
Use Scenario: Secondary-side overvoltage suppression in universal-input AC/DC adapters delivering regulated 33 V to USB-PD accessories. IC Role / Device Role / Timing Role: Final-stage TVS on output rail to absorb capacitor discharge energy during hot-plug or short-circuit recovery. Use Value: 11.3 A IPPM rating handles worst-case stored energy from 100 µF output caps without degradation after >1000 surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33AHM3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification; same SMB package and pinout. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy (e.g., VW 80101). | Drop-in replacement where halogen-free materials are contractually required; no layout or validation changes needed. |
| SMCJ33AHE3/5B | Same VWM, VBR, and VC, but in larger SMC (DO-214AB) package with 1500 W PPPM and lower RθJA (50 °C/W). | Used where higher surge endurance (>1000 surges) or improved thermal margin in enclosed enclosures is required. | Select when system-level surge testing exceeds 600 W or ambient temperature exceeds 85 °C - requires PCB footprint change. |
Compared with SMBJ33AHE3/5B, SMBJ33AHM3/5B offers identical protection performance with halogen-free construction, while SMCJ33AHE3/5B trades compact size for 2.5× higher surge capacity and better thermal dissipation - guiding selection based on environmental compliance or thermal/surge headroom needs.
Availability
SMBJ33AHE3/5B is available at Aetrix Electronics and suitable for automotive power modules, industrial sensor interfaces, telecom DC feeds, and consumer power adapter designs requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMBJ33AHE3/5B 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 was engineered for high-reliability transient suppression in space-constrained, thermally demanding environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be eliminated through qualified components and proven ruggedization.
FAQ
What is the clamping voltage of SMBJ33AHE3/5B at its rated peak pulse current?
The SMBJ33AHE3/5B clamps to a maximum of 53.3 V at its specified peak pulse current of 11.3 A under the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry downstream will not experience voltages exceeding this threshold during standardized surge events - a critical parameter for ensuring compatibility with 40 V-rated ICs in automotive and industrial systems.
Is SMBJ33AHE3/5B qualified for automotive applications?
Yes, SMBJ33AHE3/5B is AEC-Q101 qualified, as confirmed by the "HE3" suffix in its ordering code and documented in Vishay's 88392 specification. This qualification covers stress tests including temperature cycling, high-temperature operating life, and mechanical shock - making SMBJ33AHE3/5B suitable for use in engine control units, body electronics, and ADAS power domains where zero-failure reliability is mandated.
What does the "5B" in SMBJ33AHE3/5B indicate?
The "5B" denotes the packaging configuration: 13-inch diameter plastic tape and reel, with a base quantity of 3200 units per reel. This format supports high-speed automated pick-and-place assembly and is compatible with standard SMT feeders - distinct from "52" (7-inch reel, 750 units) and "H"/"I" variants used for different reel sizes or humidity-sensitive handling requirements.
How does SMBJ33AHE3/5B differ from bidirectional variants like SMBJ33CAHE3/5B?
SMBJ33AHE3/5B is unidirectional and features a cathode band for polarity-sensitive placement, whereas SMBJ33CAHE3/5B is bidirectional with no polarity marking and symmetric breakdown in both directions. The unidirectional SMBJ33AHE3/5B provides lower leakage (<1.0 µA at 33 V) and is preferred for DC rail protection; the bidirectional version suits AC-coupled or floating signal lines where voltage polarity reverses.
What is the maximum operating temperature for SMBJ33AHE3/5B?
The SMBJ33AHE3/5B has a maximum junction temperature (TJmax) of +150 °C and an operating junction/storage temperature range of -55 °C to +150 °C. This wide range enables deployment in under-hood automotive locations, industrial motor drives, and outdoor telecom enclosures - provided thermal design accounts for its RθJA of 100 °C/W on standard PCB pads.
SMBJ33AHE3/5B 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ33AHE3/5B FAQ
1.How can I place an order for SMBJ33AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33AHE3/5B 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 SMBJ33AHE3/5B reliable?
The price and inventory of SMBJ33AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33AHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ33AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33AHE3/5B?
SMBJ33AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33AHE3/5B 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 SMBJ33AHE3/5B?
For technical support, including SMBJ33AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33AHE3/5B requirements.
6.How does Aetrix verify that SMBJ33AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ33AHE3/5B 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 SMBJ33AHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ33AHE3/5B?
All SMBJ33AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33AHE3/5B, 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 SMBJ33AHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ33AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33AHE3/5B Tags
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