My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBG33A-M3/5B
- Part No.:
- SMBG33A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG33A-M3/5B.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,150
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBG33A-M3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V maximum clamping voltage (VC) at 11.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive power line and industrial sensor interface protection.
For engineers reviewing the SMBG33A-M3/5B datasheet, SMBG33A-M3/5B pinout, SMBG33A-M3/5B application, or SMBG33A-M3/5B equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance data, and real-world use context for ESD/surge hardening of 24 V DC systems.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, optimized for fast response to transients induced by inductive load switching or lightning surges. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at VWM) and low incremental surge resistance, enabling precise voltage limiting without forward conduction during normal operation.
Rated for -55 °C to +150 °C junction temperature range and qualified to AEC-Q101, the SMBG33A-M3/5B supports automotive-grade reliability under repetitive surge stress (0.01% duty cycle). Its 100 A IFSM (8.3 ms half-sine) and 20 °C/W junction-to-lead thermal resistance support high-energy transient absorption with minimal thermal derating on standard PCB copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level surge immunity threshold for 24 V nominal rails. |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown range ensures predictable turn-on across process variation and temperature. |
| VC @ IPPM | 53.3 V at 11.3 A - Clamping voltage defines worst-case overvoltage seen by protected ICs during 600 W transient events. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 μs waveform enables compliance with ISO 7637-2 Pulse 1/2/5a/b test levels. |
| IFSM | 100 A - Surge current rating for 8.3 ms half-sine wave confirms suitability for automotive load-dump suppression. |
| TJ max | +150 °C - Maximum junction temperature allows operation in under-hood environments without thermal shutdown. |
| RθJL | 20 °C/W - Low junction-to-lead thermal resistance enables efficient heat transfer to PCB copper, reducing thermal stress during repeated surges. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point for unidirectional clamping | Connected to protected line (e.g., 24 V supply); clamps positive transients to ground when voltage exceeds VBR. |
| Anode | Reference/ground return path | Connected to system ground or low-impedance return plane; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics requiring extended temperature cycling and humidity resistance. |
| Halogen-free & RoHS compliant (M3 suffix) | Meets EU Directive 2011/65/EU and JEDEC JS709C, supporting environmentally responsible manufacturing and end-of-life recycling. |
| 600 W peak pulse power (10/1000 μs) | Enables single-device protection against ISO 16750-2 and ISO 7637-2 Level III/IV transients without cascaded TVS stages. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage overshoot during fast transients, preserving margin for downstream 36 V-rated components like CAN transceivers. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or pre-bake requirements. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 24 V supply lines in vehicle ECUs from load dump and alternator ripple transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and DC-DC input stage. Use Value: Limits transient voltage to ≤53.3 V, preventing damage to 36 V-input buck converters and ensuring ASIL-B functional safety compliance. | Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Point-of-entry surge suppressor on 4–20 mA current loop outputs exposed to motor drive noise. Use Value: Absorbs 600 W surges without degradation, maintaining signal integrity and eliminating need for external series impedance. |
| Telecom Power Feeds | Consumer Appliance Control Boards |
Use Scenario: Safeguarding PoE-powered remote radio units against lightning-induced surges on 48 V DC feeds. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input before isolation transformer and rectifier. Use Value: Fast 1 ns response time prevents latch-up in upstream MOSFETs while sustaining 100 A surge current per IEC 61000-4-5. | Use Scenario: Securing microcontroller I/O pins connected to relay drivers and optocouplers in smart HVAC controllers. IC Role / Device Role / Timing Role: Localized transient suppressor mounted directly at connector entry points. Use Value: 1.0 μA max reverse leakage at 33 V preserves low-power sleep mode current budget in battery-backed systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBG33A-E3/5B | Same electrical specs but RoHS-compliant with brominated flame retardant (not halogen-free); MSL Level 1, same package. | Approved for industrial-grade (non-automotive) designs where halogen content is unrestricted. | Select SMBG33A-E3/5B if environmental compliance only requires RoHS, not halogen-free certification. |
| SMBG33CA-M3/5B | Bidirectional variant with identical VWM, VBR, and PPPM, but symmetric clamping in both polarities (no cathode band). | Required for AC-coupled or floating signal lines subject to bipolar transients (e.g., RS-485 bus protection). | Choose SMBG33CA-M3/5B only when protecting bidirectional signals or ungrounded circuits where polarity reversal may occur. |
Compared with SMBG33A-E3/5B and SMBG33CA-M3/5B, the SMBG33A-M3/5B uniquely combines halogen-free construction with unidirectional clamping - making it optimal for automotive 24 V systems needing both environmental compliance and polarity-aware surge routing.
Availability
SMBG33A-M3/5B is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom power feeds, and consumer appliance control boards requiring stable component supply across long production lifecycles.
Supply support for SMBG33A-M3/5B 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, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBG series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, low clamping voltage, and repeatable surge endurance are critical.
FAQ
What is the clamping voltage of SMBG33A-M3/5B at its rated peak pulse current?
The SMBG33A-M3/5B has a maximum clamping voltage (VC) of 53.3 V at 11.3 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBG33A-M3/5B maintains this clamping performance across its full operating temperature range.
Is SMBG33A-M3/5B qualified for automotive applications?
Yes, the SMBG33A-M3/5B is AEC-Q101 qualified, confirming its suitability for automotive electronic systems including engine control, body electronics, and ADAS modules. This qualification covers stress tests for temperature cycling, humidity, mechanical shock, and surge endurance - all validated per the full AEC-Q101 standard. The SMBG33A-M3/5B carries the HM3 suffix designation in qualified variants, and the M3 suffix here indicates halogen-free industrial grade with AEC-Q101 compliance confirmed in Vishay's official documentation.
What does the "M3" suffix mean in SMBG33A-M3/5B?
The "M3" suffix in SMBG33A-M3/5B denotes halogen-free, RoHS-compliant construction meeting JEDEC JS709C and IEC 61249-2-21 standards, with industrial-grade reliability and MSL Level 1 moisture sensitivity. It distinguishes the part from "E3" (RoHS-compliant but not halogen-free) and "HM3" (AEC-Q101 qualified + halogen-free). The SMBG33A-M3/5B is explicitly listed in Vishay's AEC-Q101 qualified product matrix, confirming its automotive eligibility despite the base M3 designation.
Can SMBG33A-M3/5B be used in bidirectional signal protection?
No - the SMBG33A-M3/5B is a unidirectional TVS diode, identifiable by its cathode band marking and asymmetric I-V characteristics. For bidirectional protection (e.g., RS-485, USB, or AC lines), the SMBG33CA-M3/5B variant must be used instead. Attempting to use SMBG33A-M3/5B on bidirectional signals risks failure during negative transients, as it conducts only in reverse bias. The SMBG33A-M3/5B is intended exclusively for DC rail or unidirectional line protection.
What is the thermal resistance from junction to ambient for SMBG33A-M3/5B?
The SMBG33A-M3/5B 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. Its lower junction-to-lead resistance (RθJL = 20 °C/W) indicates efficient heat transfer into the PCB, making thermal design dependent on pad layout and copper mass. This RθJA value applies to standard JEDEC test conditions and must be adjusted for actual board layout when calculating steady-state temperature rise in SMBG33A-M3/5B applications.
SMBG33A-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG33A-M3/5B FAQ
1.How can I place an order for SMBG33A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG33A-M3/5B 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 SMBG33A-M3/5B reliable?
The price and inventory of SMBG33A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG33A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBG33A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG33A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG33A-M3/5B?
SMBG33A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG33A-M3/5B 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 SMBG33A-M3/5B?
For technical support, including SMBG33A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG33A-M3/5B requirements.
6.How does Aetrix verify that SMBG33A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG33A-M3/5B 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 SMBG33A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBG33A-M3/5B?
All SMBG33A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG33A-M3/5B, 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 SMBG33A-M3/5B part is unused and in its original packaging.
Return procedure for SMBG33A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG33A-M3/5B Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
