My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ33CAHM3_A/I
- Part No.:
- SMBJ33CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CAHM3_A/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,039
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ33CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) 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 industrial sensor signal lines and automotive ECUs against ESD and inductive switching transients.
For engineers reviewing the SMBJ33CAHM3_A/I datasheet, SMBJ33CAHM3_A/I pinout, SMBJ33CAHM3_A/I application, or SMBJ33CAHM3_A/I equivalent, this part delivers verified bidirectional clamping performance, halogen-free RoHS-compliant construction (HM3 suffix), AEC-Q101 qualification, and MSL Level 1 moisture sensitivity - critical for high-reliability embedded power rail and data line protection in harsh environments.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 33 V), then rapidly avalanches below 53.3 V to divert transient energy away from downstream ICs. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance across temperature.
The device supports bidirectional operation - symmetrical clamping in both polarities - making it suitable for AC-coupled or floating signal paths. Thermal design relies on its RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), requiring minimum 0.2" × 0.2" copper pads per terminal for rated 600 W pulse handling per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before significant leakage begins; defines safe working margin for protected circuit. |
| VBR (min/max) | 36.7 V / 40.6 V at IT = 1 mA - guaranteed avalanche onset range; ensures predictable turn-on during transients. |
| VC @ IPPM | 53.3 V at 11.3 A - clamped voltage seen by protected load during full 600 W surge; determines maximum stress on downstream components. |
| PPPM | 600 W - peak pulse power dissipation capability with 10/1000 µs waveform; validates protection level against IEC 61000-4-5 surges. |
| IPPM | 11.3 A - peak pulse current corresponding to VC; used to size PCB trace width and thermal relief for surge conduction path. |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood automotive or industrial ambient up to +125 °C with derating. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals with identical electrical behavior in either direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Conducts surge current into junction during positive voltage excursion; connects to line being protected. |
| Cathode | Transient current entry (negative half-cycle) | Conducts surge current into junction during negative voltage excursion; connects to same line - bidirectional symmetry means both terminals serve dual roles. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or ungrounded buses without polarity concerns - eliminates need for dual unidirectional devices. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - supports use in engine control, body electronics, and ADAS modules. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global OEM supply chains while maintaining solderability per J-STD-002 and whisker resistance per JESD 201 Class 2. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV) surge events on 50 Ω source impedance when properly mounted - reduces need for additional series impedance. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free reflow profiles without preconditioning - simplifies manufacturing integration and avoids moisture-related popcorning. |
Applications
| Automotive Sensor Signal Protection | Industrial CAN Bus Line Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay environments exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between signal line and ground, clamping spikes before they reach ADC input or signal conditioner IC. Use Value: Maintains signal integrity under ±100 V transients by limiting voltage to ≤53.3 V, preventing latch-up or damage to 3.3 V/5 V interface ICs. |
Use Scenario: Safeguarding CAN_H/CAN_L differential pair in factory automation controllers subjected to EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pair to clamp common-mode surges while preserving signal swing and timing margins. Use Value: Enables reliable CAN FD communication up to 5 Mbps by suppressing >300 V transients without adding capacitance that degrades edge rate. |
| Telecom Power Rail Clamping | Consumer USB Interface ESD Protection |
|
Use Scenario: Securing 12 V DC input rails of PoE-powered network switches against lightning-induced surges on Ethernet cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC-DC converter, absorbing energy before it reaches primary-side MOSFETs or controller ICs. Use Value: Absorbs 600 W pulses without degradation, allowing system-level surge immunity to meet IEC 61000-4-5 Ed. 3 requirements without external crowbar circuits. |
Use Scenario: Protecting USB 2.0 D+/D− lines in smart home hubs against human-body-model (HBM) ESD events during plug/unplug cycles. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical at 0 V) bidirectional clamp placed directly at connector, shunting ESD current to ground. Use Value: Limits ESD-induced voltage to <55 V within <1 ns, preventing damage to USB transceiver PHY while maintaining signal integrity up to 480 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CAHE3_A/I | Same electrical specs and SMB package, but RoHS-compliant commercial grade (not halogen-free); lacks AEC-Q101 qualification. | Suitable for non-automotive industrial or consumer applications where halogen-free requirement or automotive qualification is not mandated. | Select when cost sensitivity outweighs halogen-free or AEC-Q101 needs; verify board-level flame rating compatibility (UL 94 V-0 maintained). |
| SMAJ33CAHM3_A/I | Lower 400 W PPPM, same VWM/VC, smaller SMA (DO-214AC) package - 20% smaller footprint and lower thermal mass. | Better suited for space-constrained designs with lower surge threat levels (e.g., IEC 61000-4-2 only), but derates faster above 25 °C ambient. | Choose for compact layouts where 400 W rating suffices; confirm thermal relief and pad area match SMA's higher RθJA (140 °C/W). |
Compared with SMBJ33CAHM3_A/I, SMBJ33CAHE3_A/I trades halogen-free construction and AEC-Q101 for lower cost, while SMAJ33CAHM3_A/I sacrifices 33% peak power and thermal robustness for reduced board area - selection depends on environmental compliance, reliability tier, and physical constraints.
Availability
SMBJ33CAHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power rail protection requiring stable component supply across extended production lifecycles.
Supply support for SMBJ33CAHM3_A/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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-energy transient suppression in automotive, industrial, and communications systems - engineered for fast response, stable clamping, and long-term stability under thermal and electrical stress.
FAQ
What is the clamping voltage of SMBJ33CAHM3_A/I at its rated peak pulse current?
The SMBJ33CAHM3_A/I has a maximum clamping voltage (VC) of 53.3 V at its rated peak pulse current (IPPM) of 11.3 A, measured using the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full 600 W transient event and is confirmed in Vishay's datasheet revision 09-Jan-2024, page 2. The SMBJ33CAHM3_A/I maintains this clamping performance across its specified operating temperature range.
Is SMBJ33CAHM3_A/I suitable for automotive applications?
Yes, SMBJ33CAHM3_A/I is AEC-Q101 qualified (indicated by the HM3 suffix) and specifically designed for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its construction meets halogen-free and RoHS requirements, and it is rated for operation from −55 °C to +150 °C junction temperature. The SMBJ33CAHM3_A/I has undergone stress testing per AEC-Q101 including temperature cycling, HTRB, and mechanical shock - confirming suitability for under-hood and chassis-mounted deployments.
How does the bidirectional nature of SMBJ33CAHM3_A/I affect its placement in a circuit?
The SMBJ33CAHM3_A/I has symmetrical bidirectional clamping, meaning both terminals function identically regardless of voltage polarity - no cathode band or polarity marking is present. It must be placed across the nodes requiring protection (e.g., line-to-ground or line-to-line), with no orientation dependency. This eliminates layout errors associated with unidirectional devices and simplifies design for AC-coupled or floating signal paths, such as CAN bus or audio lines. The SMBJ33CAHM3_A/I achieves this via a back-to-back diode structure integrated in a single SMB package.
What is the maximum printed circuit board pad size recommended for SMBJ33CAHM3_A/I to achieve full 600 W rating?
To achieve the full 600 W peak pulse power rating, Vishay specifies mounting the SMBJ33CAHM3_A/I on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads connected to each terminal - as defined in Figure 2 of datasheet 88392. Smaller pads result in thermal derating; for example, at 75 °C ambient, the device delivers only ~400 W with standard SMT land patterns. The SMBJ33CAHM3_A/I's RθJA = 100 °C/W assumes this pad layout, and thermal simulation should validate junction temperature rise under worst-case surge duty cycle.
Does SMBJ33CAHM3_A/I have a specified junction capacitance, and how does it impact high-speed signal lines?
Vishay does not specify junction capacitance for the SMBJ33CAHM3_A/I in the SMBJ5.0A–SMBJ188A datasheet, as capacitance is not a controlled parameter for this series and varies significantly with applied reverse voltage. At 0 V bias, typical capacitance is <50 pF - sufficient for CAN, RS-485, and analog sensor lines, but potentially problematic for USB 2.0 or HDMI if placed directly on high-speed traces. For such applications, the SMBJ33CAHM3_A/I should be positioned after series impedance or paired with low-capacitance TVS arrays. Always measure actual capacitance in-system if signal integrity is critical.
SMBJ33CAHM3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ33CAHM3_A/I FAQ
1.How can I place an order for SMBJ33CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CAHM3_A/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 SMBJ33CAHM3_A/I reliable?
The price and inventory of SMBJ33CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ33CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CAHM3_A/I?
SMBJ33CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CAHM3_A/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 SMBJ33CAHM3_A/I?
For technical support, including SMBJ33CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ33CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ33CAHM3_A/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 SMBJ33CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ33CAHM3_A/I?
All SMBJ33CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CAHM3_A/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 SMBJ33CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ33CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CAHM3_A/I 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 …
