My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ33AHM3/I
- Part No.:
- SMCJ33AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33AHM3/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,212
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ33AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 33 V stand-off voltage (VWM), 53.3 V maximum clamping voltage at 28.1 A peak pulse current (10/1000 µs), and 1500 W peak pulse power rating - ideal for safeguarding automotive ECUs, industrial I/O modules, and telecom power supplies against ESD and load dump transients.
For engineers reviewing the SMCJ33AHM3/I datasheet, SMCJ33AHM3/I pinout, SMCJ33AHM3/I application, or SMCJ33AHM3/I equivalent, this device delivers verified AEC-Q101 qualification, halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for high-reliability automotive and industrial designs requiring long-term supply stability and assembly compatibility with lead-free reflow.
Technical Context
The SMCJ33AHM3/I operates as a silicon avalanche diode with glass-passivated junction, enabling sub-nanosecond response to transients. Its unidirectional polarity uses a cathode band marking, and it exhibits low incremental surge resistance (typical < 1.9 Ω) to minimize voltage overshoot during high-current surges up to 28.1 A (10/1000 µs).
Thermally, it supports operation from –55 °C to +150 °C junction temperature, with RθJA = 75 °C/W and RθJL = 15 °C/W, allowing effective heat dissipation on standard 8.0 mm × 8.0 mm copper pads per terminal - essential for sustained surge handling in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; sets safe DC rail margin for 24 V systems. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - Verified breakdown threshold ensures consistent turn-on across production lots. |
| VC @ IPPM | 53.3 V at 28.1 A - Clamping voltage under full 1500 W surge defines worst-case stress on downstream ICs. |
| PPPM | 1500 W - Peak pulse power rating with 10/1000 µs waveform; validates immunity to ISO 7637-2 Pulse 1/2a/5a transients. |
| IPPM | 28.1 A - Peak surge current capability directly determines minimum trace width and fuse coordination. |
| TJ max | +150 °C - Enables use in under-hood automotive environments without derating at ambient ≤ 125 °C. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height for automated placement. |
Pinout & Package
SMCJ33AHM3/I is housed in an SMC (DO-214AB) package with two terminals: anode and cathode. The cathode is marked by a visible band on the body. Leads are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive reference terminal | Connected to protected line (e.g., 24 V rail); reverse-biased during normal operation. |
| Cathode | Clamping output terminal | Connected to ground; conducts surge current when VAK exceeds VBR, limiting voltage to ≤53.3 V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and JEDEC J-STD-20 MSL Level 1 - no pre-bake required before reflow. |
| 1500 W peak pulse power | Withstands ISO 16750-2 load dump pulses (up to 35 V, 100 ms) when used with series impedance. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage stress on protected ICs compared to higher-ratio TVS devices. |
| Glass-passivated junction | Ensures stable leakage (<1 µA at 33 V) and long-term reliability under thermal cycling and humidity. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs in engine control units (ECUs) against ISO 7637-2 Pulse 5a (load dump) and ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC-DC input, conducting only during overvoltage. Use Value: Limits transient voltage to ≤53.3 V, preventing damage to upstream regulators and microcontrollers rated for 36 V absolute max. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC I/O modules from cable-induced surges. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and ground, responding within <1 ns to fast transients. Use Value: Maintains signal integrity with <1 µA leakage at 33 V, avoiding DC offset errors in precision 4–20 mA loops. |
| Telecom DC Power Input Protection | Consumer Device USB Power Line Protection |
Use Scenario: Safeguarding 48 V PoE-powered equipment (e.g., IP cameras, wireless access points) from lightning-induced surges on Ethernet cables. IC Role / Device Role / Timing Role: Primary TVS on DC input stage, coordinated with MOVs and gas discharge tubes for multi-stage protection. Use Value: 1500 W rating enables single-device handling of IEC 61000-4-5 Level 4 (4 kV) surges when properly mounted on thermal pads. | Use Scenario: Adding secondary overvoltage protection on USB-C VBUS lines in portable monitors and docking stations. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary protection to catch residual spikes missed by upstream filters. Use Value: 33 V VWM avoids false triggering during USB PD negotiation (up to 20 V), while clamping to 53.3 V prevents USB controller latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33AHE3/A | Lower PPPM (400 W), SMA package (smaller footprint, lower thermal mass) | Suitable for space-constrained consumer electronics but not automotive load dump | Select for cost-sensitive, non-automotive applications where 400 W surge immunity suffices. |
| SMCJ33AHE3/I | Same electrical specs, but commercial-grade (non-AEC-Q101) and RoHS-compliant (E3), not halogen-free | Acceptable for industrial controls but excluded from automotive BOMs requiring HM3 qualification | Choose when halogen-free requirement is waived and AEC-Q101 is not mandated. |
Compared with SMCJ33AHM3/I, SMAJ33AHE3/A offers reduced surge capacity in a smaller package, while SMCJ33AHE3/I provides identical performance without halogen-free or AEC-Q101 validation - making SMCJ33AHM3/I the sole choice for automotive-qualified, environmentally compliant designs demanding full 1500 W immunity.
Availability
SMCJ33AHM3/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply, long-term lifecycle support, and AEC-Q101 assurance.
Supply support for SMCJ33AHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMCJ series was developed specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of SMCJ33AHM3/I at its rated peak pulse current?
The SMCJ33AHM3/I has a maximum clamping voltage (VC) of 53.3 V at its rated peak pulse current (IPPM) of 28.1 A, measured using the standard 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-power transient event and is critical for ensuring downstream components remain within their absolute maximum ratings. The SMCJ33AHM3/I maintains this clamping performance across its specified operating temperature range.
Is SMCJ33AHM3/I qualified for automotive applications?
Yes, SMCJ33AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3", which denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. This qualification covers stress tests including high-temperature operating life, temperature cycling, and mechanical shock - validating its suitability for under-hood and chassis-mounted automotive systems. The SMCJ33AHM3/I data sheet explicitly references AEC-Q101 compliance in the Mechanical Data section.
What does the "HM3" suffix indicate in SMCJ33AHM3/I?
The "HM3" suffix in SMCJ33AHM3/I identifies it as halogen-free, RoHS-compliant, and AEC-Q101 qualified - distinguishing it from commercial-grade variants like "E3" or "M3". Per Vishay's ordering information table, HM3 parts meet JESD 201 Class 2 whisker resistance and MSL Level 1 per J-STD-020, enabling direct placement into lead-free reflow processes without baking. This suffix confirms full compliance with automotive environmental and reliability standards.
How does SMCJ33AHM3/I differ from bidirectional versions like SMCJ33CA?
The SMCJ33AHM3/I is unidirectional, meaning it functions as a polarity-sensitive clamp with a defined cathode band and conducts only in reverse bias - ideal for DC power line protection. In contrast, SMCJ33CA is bidirectional, offering symmetrical clamping in both directions for AC signal or data line protection. Their VWM (33 V) and VC (53.3 V) match, but SMCJ33AHM3/I cannot replace SMCJ33CA in AC-coupled circuits without redesigning biasing and grounding.
What is the thermal resistance of SMCJ33AHM3/I, and how does it affect layout?
The SMCJ33AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. To achieve rated surge performance, Vishay specifies mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Reducing pad area increases RθJA, causing higher junction temperatures during repeated surges and potential derating - so PCB layout must strictly follow the recommended pad dimensions to maintain 1500 W capability.
SMCJ33AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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):
- 28.1A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ33AHM3/I FAQ
1.How can I place an order for SMCJ33AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33AHM3/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 SMCJ33AHM3/I reliable?
The price and inventory of SMCJ33AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33AHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ33AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33AHM3/I?
SMCJ33AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33AHM3/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 SMCJ33AHM3/I?
For technical support, including SMCJ33AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33AHM3/I requirements.
6.How does Aetrix verify that SMCJ33AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ33AHM3/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 SMCJ33AHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ33AHM3/I?
All SMCJ33AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33AHM3/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 SMCJ33AHM3/I part is unused and in its original packaging.
Return procedure for SMCJ33AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33AHM3/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 …
