My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ33CD-M3/H
- Part No.:
- SMBJ33CD-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CD-M3/H.pdf
- Description:
- TVS DIODE 33VWM 52.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,150
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ33CD-M3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust ESD and surge protection on signal/power lines. It features a 33 V stand-off voltage (VWM), 37.3–40.0 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), clamping voltage of 52.5 V at 11.5 A, and operates from –55 °C to +150 °C - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ33CD-M3/H datasheet, SMBJ33CD-M3/H pinout, SMBJ33CD-M3/H application, or SMBJ33CD-M3/H equivalent, key selection criteria include bidirectional clamping behavior, low leakage (<0.5 μA at 33 V), ±3.5% VBR tolerance, MSL Level 1 reflow compatibility, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
This bidirectional TVS diode functions as a voltage-clamped shunt protector, responding within picoseconds to transients exceeding its reverse stand-off voltage (VWM = 33 V). Its symmetrical I-V characteristics enable identical clamping in both polarities, eliminating polarity dependency in AC-coupled or floating signal paths.
It delivers 600 W peak pulse power handling under standardized 10/1000 μs waveform conditions with 0.01% duty cycle, supported by low incremental surge resistance and excellent clamping ratio (VC/VBR ≈ 1.35). Thermal design relies on PCB copper pad area (min. 5.0 mm × 5.0 mm) to sustain 5.0 W power dissipation at TM = 50 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 37.3 V / 40.0 V at 1 mA - tight ±3.5% tolerance ensures predictable turn-on across production lots |
| VC @ IPPM | 52.5 V at 11.5 A - clamping voltage limits downstream IC stress during 600 W surge events |
| PPPM | 600 W (10/1000 μs) - industry-standard surge rating for lightning and inductive switching immunity |
| ID @ VWM | <0.5 μA - ultra-low leakage preserves signal integrity in high-impedance sensor or data lines |
| TJ max | +150 °C - supports operation in under-hood automotive or enclosed industrial enclosures |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
Two-terminal device in SMB (DO-214AA) package; no cathode band marking due to bidirectional symmetry. Terminals are matte tin-plated, solderable per J-STD-002 and JESD22-B102, with M3 suffix confirming halogen-free, RoHS-compliant, industrial-grade construction and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge path | Either terminal serves as input/output - no polarity sensitivity; connects across protected line and ground or differential pair |
| Case | Thermal conduction path | Exposed metal slug transfers heat to PCB copper; requires minimum 5.0 mm × 5.0 mm thermal pad for rated 5.0 W dissipation |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise, repeatable clamping threshold without system-level calibration or margining overhead |
| 600 W peak pulse power | Meets IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) surge immunity requirements |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without preconditioning or special handling |
| <0.5 μA reverse leakage @ VWM | Prevents DC loading or offset errors in precision analog front-ends and battery-powered sensors |
| Halogen-free & RoHS-compliant (M3) | Fulfills environmental compliance for global industrial and telecom equipment certifications |
Applications
| Industrial Sensor Interface Protection | Telecom Line Surge Suppression |
|---|---|
Use Scenario: Protecting 4–20 mA current loop or RS-485 transceivers in factory automation PLCs exposed to motor switching noise and ground potential differences. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal line and chassis ground, absorbing fast-rising transients before they reach the transceiver IC. Use Value: Prevents latch-up or permanent damage to RS-485 drivers/receivers during 1 kV/μs common-mode surges, maintaining communication uptime. | Use Scenario: Safeguarding Ethernet PHY or DSL line drivers connected to outdoor copper pairs subject to induced lightning surges. IC Role / Device Role / Timing Role: Primary front-end TVS on differential pair (e.g., TIP/RING), clamping mode-switching transients before reaching isolation transformers or PHY ICs. Use Value: Limits peak differential voltage to ≤52.5 V, preserving transformer insulation integrity and preventing PHY overvoltage shutdown. |
| Automotive Body Control Module (BCM) Inputs | Consumer Appliance Motor Drive Feedback Lines |
Use Scenario: Securing LIN bus or discrete switch inputs in BCMs subjected to load dump and ISO 7637-2 pulse 5a/b transients. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp on each input pin, referenced to vehicle chassis ground. Use Value: Withstands 100 V/10 ms pulses without degradation while adding <1 pF parasitic capacitance - no signal rise-time impact. | Use Scenario: Shielding hall-effect sensor or encoder feedback signals in washing machine motor control boards from brush-commutator noise. IC Role / Device Role / Timing Role: Point-of-load TVS on low-voltage analog feedback traces routed near high-current inverter stages. Use Value: Clamps sub-100 ns spikes to safe levels (<52.5 V), avoiding false zero-crossing detection or ADC saturation in real-time motor control loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA-E3/52 (Vishay) | Same VWM/VBR/PPPM specs; differs only in packaging (tape-and-reel vs. bulk) and M3 suffix omission - no halogen-free or whisker-test certification | Acceptable where RoHS/halogen-free compliance is not mandated; unsuitable for automotive or EU industrial deployments requiring full M3 traceability | Select SMBJ33CD-M3/H when full industrial-grade material compliance (JESD201 Class 2, UL94 V-0, halogen-free) is contractually required. |
| P6SMB33CA (Littelfuse) | Identical SMB package, 33 V VWM, 37.3–40.0 V VBR, 600 W PPPM - but wider VBR tolerance (±5%), higher ID (1.0 μA), and no M3 qualification | Valid for cost-sensitive consumer designs where tighter VBR tolerance and lower leakage are non-critical; lacks MSL Level 1 reflow assurance | Choose SMBJ33CD-M3/H for applications demanding guaranteed ±3.5% VBR consistency, <0.5 μA leakage, and verified 260 °C reflow capability. |
Compared with SMBJ33CA-E3/52 and P6SMB33CA, SMBJ33CD-M3/H provides tighter VBR tolerance, lower leakage, and certified industrial-grade reliability - making it preferred for mission-critical industrial, telecom, and automotive-adjacent systems where long-term surge immunity consistency is mandatory.
Availability
SMBJ33CD-M3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and consumer appliance motor feedback circuits requiring stable component supply and full M3 compliance documentation.
Supply support for SMBJ33CD-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, power efficiency, and application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, telecommunications infrastructure, and automotive subsystems where consistent clamping behavior and long-term stability under repeated surge stress are critical.
FAQ
What does the "CD" suffix indicate in SMBJ33CD-M3/H?
The "CD" suffix in SMBJ33CD-M3/H denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBJ33D), SMBJ33CD-M3/H has no cathode band and exhibits identical electrical characteristics in either polarity - essential for protecting AC-coupled, floating, or differential signal paths without polarity concerns.
Is SMBJ33CD-M3/H compatible with lead-free reflow soldering?
Yes, SMBJ33CD-M3/H is rated for MSL Level 1 per J-STD-020 with a maximum peak reflow temperature of 260 °C, fully supporting standard lead-free soldering processes. Its matte tin-plated terminals meet J-STD-002 and JESD22-B102 solderability requirements, and the M3 suffix confirms qualification to JESD201 Class 2 whisker testing - ensuring reliable interconnect integrity after multiple thermal cycles.
What is the clamping voltage of SMBJ33CD-M3/H under surge conditions?
The SMBJ33CD-M3/H clamps to a maximum of 52.5 V when subjected to its rated 11.5 A peak pulse current (IPPM), derived from the 600 W peak pulse power rating using a 10/1000 μs waveform. This VC value is measured at the device terminals under standardized test conditions and represents the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
How does the VBR tolerance of SMBJ33CD-M3/H affect system design?
SMBJ33CD-M3/H features a tight ±3.5 % breakdown voltage tolerance (37.3–40.0 V at 1 mA), enabling precise, deterministic clamping onset without overdesigning protection margins. This reduces the need for additional series impedance or secondary clamping stages, simplifies layout, and improves system-level surge test pass rates - especially valuable in space-constrained industrial and telecom modules where voltage headroom is limited.
Can SMBJ33CD-M3/H be used in place of a unidirectional TVS like SMBJ33D?
No - SMBJ33CD-M3/H is strictly bidirectional and must not replace unidirectional types like SMBJ33D in DC-biased applications (e.g., single-supply power rails), as it lacks polarity discrimination and would short the rail during normal operation. It is only suitable where symmetrical protection is required, such as AC signal lines, differential buses (RS-485, CAN), or floating sensor outputs. Substitution requires full circuit review and validation of bias conditions.
SMBJ33CD-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ33CD-M3/H FAQ
1.How can I place an order for SMBJ33CD-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CD-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 SMBJ33CD-M3/H reliable?
The price and inventory of SMBJ33CD-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 SMBJ33CD-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ33CD-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CD-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CD-M3/H?
SMBJ33CD-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CD-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 SMBJ33CD-M3/H?
For technical support, including SMBJ33CD-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CD-M3/H requirements.
6.How does Aetrix verify that SMBJ33CD-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ33CD-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 SMBJ33CD-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ33CD-M3/H?
All SMBJ33CD-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CD-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 SMBJ33CD-M3/H part is unused and in its original packaging.
Return procedure for SMBJ33CD-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CD-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 …
