My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ33D-M3/H
;;2.jpg)
- Part No.:
- SMBJ33D-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33D-M3/H.pdf
- Description:
- TVS DIODE 33VWM 52.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,900
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ33D-M3/H 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), 37.3–40.0 V breakdown voltage (VBR) at 1 mA, 52.5 V clamping voltage (VC) at 11.5 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed in industrial sensor interfaces and MOSFET gate protection.
For engineers reviewing the SMBJ33D-M3/H datasheet, SMBJ33D-M3/H pinout, SMBJ33D-M3/H application, or SMBJ33D-M3/H equivalent, key selection criteria include clamping performance under 11.5 A surge, thermal resistance (RθJA = 125 °C/W on minimum pad), unidirectional polarity with cathode band marking, and M3/H halogen-free RoHS-compliant tape-and-reel packaging for automated SMT assembly.
Technical Context
This TVS diode operates as a clamping-type protector, leveraging avalanche breakdown to limit transient voltages above its VBR threshold while maintaining low leakage (<0.5 μA at 33 V). Its 10/1000 μs waveform rating reflects standardized surge immunity testing per ANSI/IEEE C62.35, with derating applied above 25 °C ambient per Fig. 2.
The device is optimized for placement directly across protected nodes - such as DC input rails or I/O lines - where fast response time (<1 ns), low incremental surge resistance, and stable clamping under repetitive transients are required. It meets J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before significant conduction begins |
| VBR min/max | 37.3 V / 40.0 V at 1.0 mA - tight ±3.5 % tolerance ensures predictable turn-on across production lots |
| VC @ IPPM | 52.5 V at 11.5 A - clamping voltage defines worst-case voltage seen by downstream circuitry during surge |
| PPPM | 600 W (10/1000 μs) - peak transient energy handling capability under standardized surge waveform |
| ID @ VWM | ≤0.5 μA - ultra-low leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - enables reliable operation in high-temperature industrial environments |
| RθJA | 125 °C/W - thermal resistance on minimum recommended PCB pad layout dictates power derating |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads; cathode indicated by molded band on case end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential rail in unidirectional configuration |
| Cathode | High-side connection point | Marked by band; connected to protected line or supply rail - conducts during positive transients |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise coordination with system overvoltage thresholds without margin stacking |
| 600 W peak pulse power | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-earth) when properly laid out |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without preconditioning |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during surge, reducing stress on downstream ICs like microcontrollers |
| JESD 201 Class 2 whisker resistance | Ensures long-term solder joint reliability in automotive and industrial applications |
Applications
| Industrial Sensor Interface Protection | DC Power Rail Clamping |
|---|---|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA, 0–10 V) of temperature/pressure sensors from ESD and inductive switching transients in factory automation systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground, clamping positive surges before they reach ADC input or op-amp buffer. Use Value: Limits transient voltage to ≤52.5 V, preserving sensor accuracy and preventing latch-up in precision front-end circuitry. | Use Scenario: Safeguarding 24 V DC input rails of PLC modules against load dump and relay coil flyback in control cabinets. IC Role / Device Role / Timing Role: Mounted across input terminals to clamp voltage spikes up to 600 W, diverting surge current away from DC-DC converters and microcontrollers. Use Value: Maintains rail stability below 52.5 V during 11.5 A transients, avoiding brownout resets and MOSFET avalanche failure. |
| MOSFET Gate Protection | Telecom Line Interface |
Use Scenario: Shielding N-channel MOSFET gates driven by microcontroller GPIOs from coupling-induced transients in motor drive half-bridges. IC Role / Device Role / Timing Role: Connected anode-to-ground, cathode-to-gate, suppressing positive-going spikes that could exceed VGS(max) and cause gate oxide rupture. Use Value: Clamps gate voltage to ≤52.5 V within nanoseconds, enabling safe use of 30 V-rated MOSFETs with 24 V logic-level drive. | Use Scenario: Protecting RS-485 transceiver data lines in building management systems exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Paired with series impedance (e.g., 10 Ω resistor) on each differential line, providing bidirectional-like protection via two unidirectional devices. Use Value: Limits line-to-ground voltage excursion to ≤52.5 V during 10/1000 μs surges, preventing transceiver latch-up and data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A-M3/H | Bidirectional variant; same VWM (33 V), but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where negative transients dominate | Select SMBJ33A-M3/H only if protection against reverse-polarity surges is needed; SMBJ33D-M3/H is optimal for DC rails with defined ground reference. |
| SMCJ33A | Larger SMC (DO-214AB) package; same electrical specs but higher thermal mass (RθJA = 40 °C/W) | Better suited for high-repetition-rate surges or elevated ambient temperatures (>85 °C) | Choose SMCJ33A when board space allows and thermal performance outweighs SMT placement density requirements. |
Compared with SMBJ33A-M3/H and SMCJ33A, SMBJ33D-M3/H offers tighter VBR tolerance and smaller footprint for cost-sensitive, space-constrained DC protection - but lacks bidirectional capability and has higher thermal resistance than SMC-packaged alternatives.
Availability
SMBJ33D-M3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, DC power rail clamping, and MOSFET gate protection requiring stable component supply, consistent M3-grade reliability, and halogen-free compliance.
Supply support for SMBJ33D-M3/H 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 and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh industrial and automotive environments, balancing compact size, tight parametric control, and robust surge handling per IEC and ANSI standards.
FAQ
What is the clamping voltage of SMBJ33D-M3/H at its rated peak pulse current?
The SMBJ33D-M3/H has a maximum clamping voltage (VC) of 52.5 V at its rated peak pulse current (IPPM) of 11.5 A, measured using the standard 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring downstream components remain within their absolute maximum ratings. The SMBJ33D-M3/H maintains this clamping performance across its specified junction temperature range.
Is SMBJ33D-M3/H suitable for protecting 24 V DC power supplies?
Yes, SMBJ33D-M3/H is specifically designed for 24 V DC rail protection: its 33 V stand-off voltage (VWM) provides adequate margin above nominal 24 V operation while allowing rapid conduction during transients exceeding ~37 V. With a 52.5 V clamping voltage and 600 W surge rating, it effectively limits surge energy to levels compatible with common 30 V-rated DC-DC controllers and MOSFETs. Layout adherence to Vishay's recommended 5.0 mm × 5.0 mm copper pad is essential for thermal performance.
Does SMBJ33D-M3/H have a bidirectional version?
No - SMBJ33D-M3/H is unidirectional, with polarity marked by a cathode band. Its bidirectional counterpart is SMBJ33A-M3/H (note 'A' suffix), which provides symmetrical clamping for AC or floating signal lines. The 'D' suffix explicitly denotes unidirectional construction; substituting SMBJ33D-M3/H in a bidirectional application would leave negative transients unprotected. Always verify polarity alignment during PCB layout.
What does the 'M3/H' suffix indicate in SMBJ33D-M3/H?
The 'M3' suffix signifies halogen-free, RoHS-compliant construction meeting JESD 201 Class 2 whisker resistance, while 'H' denotes packaging in 7″ diameter plastic tape and reel with 750 units per reel. This configuration supports automated SMT placement and satisfies environmental compliance requirements for industrial and consumer electronics. The M3 grade also confirms compliance with Vishay's industrial temperature and reliability specifications.
How does SMBJ33D-M3/H compare to SMAJ33A in terms of surge handling?
SMBJ33D-M3/H delivers 600 W peak pulse power (10/1000 μs), whereas SMAJ33A is rated for only 400 W - a 50 % higher energy capacity. This difference stems from the larger SMB package's improved thermal dissipation versus the smaller SMA (DO-214AC). For applications subject to repeated or high-amplitude transients - such as industrial motor drives - SMBJ33D-M3/H provides greater margin. However, SMAJ33A may be preferred where board space is extremely constrained and 400 W suffices.
SMBJ33D-M3/H 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):
- 37.3V
- Voltage - Clamping (Max) @ Ipp:
- 52.5V
- Current - Peak Pulse (10/1000µs):
- 11.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ33D-M3/H FAQ
1.How can I place an order for SMBJ33D-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33D-M3/H 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 SMBJ33D-M3/H reliable?
The price and inventory of SMBJ33D-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33D-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ33D-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33D-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33D-M3/H?
SMBJ33D-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33D-M3/H 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 SMBJ33D-M3/H?
For technical support, including SMBJ33D-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33D-M3/H requirements.
6.How does Aetrix verify that SMBJ33D-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ33D-M3/H 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 SMBJ33D-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ33D-M3/H?
All SMBJ33D-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33D-M3/H, 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 SMBJ33D-M3/H part is unused and in its original packaging.
Return procedure for SMBJ33D-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33D-M3/H 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 …
