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Vishay General Semiconductor - Diodes Division SMCJ30AHM3_A/I
- Part No.:
- SMCJ30AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30AHM3_A/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,363
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Product details
Overview
SMCJ30AHM3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection. It features a 30 V standoff voltage (VWM), 48.4 V clamping voltage (VC) at 31.0 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform. It is halogen-free, RoHS-compliant, and qualified to AEC-Q101 for automotive electronics protection.
For engineers reviewing the SMCJ30AHM3_A/I datasheet, SMCJ30AHM3_A/I pinout, SMCJ30AHM3_A/I application, or SMCJ30AHM3_A/I equivalent, key selection criteria include clamping performance under 31 A surge, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector, responding in <1 ps to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, while the SMC package supports high thermal dissipation during repetitive surge events.
The device is rated for -55 °C to +150 °C operating junction temperature, with a 0.099 %/°C temperature coefficient of VBR. It meets MSL level 1 per J-STD-020 and passes JESD 201 class 2 whisker testing - critical for automotive and industrial PCB reliability under thermal cycling and vibration stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR min/max | 33.3 V / 36.8 V at 1.0 mA IT - verified breakdown threshold range ensuring predictable turn-on across production lots. |
| VC @ IPPM | 48.4 V at 31.0 A - clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 1500 W - peak pulse power handling capacity; enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω). |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard 0.31" × 0.31" copper pads; informs derating above 25 °C ambient. |
| TJ max | +150 °C - maximum junction temperature rating; supports operation in engine bay or industrial control enclosures. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected circuit return path | Connected to ground or low-impedance reference; conducts surge current to common reference during overvoltage event. |
| Anode | Signal or power line input | Connected to line being protected (e.g., 24 V supply rail or CAN_H); reverse-biased under normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables single-device protection against severe transients per ISO 7637-2 Pulse 5a (load dump) without cascaded stages. |
| 48.4 V clamping at 31 A | Limits voltage overshoot below 50 V on 30 V systems, safeguarding 3.3 V/5 V logic interfaces and gate drivers. |
| AEC-Q101 qualification | Validates long-term reliability in automotive environments including under-hood temperature cycling and vibration exposure. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental compliance requirements for Tier 1 automotive suppliers and industrial OEMs. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates baking requirement and simplifies SMT manufacturing flow. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply lines in body control modules from load dump transients up to 120 V. IC Role / Device Role / Timing Role: Shunt TVS diode placed between VBAT and chassis ground, activated within picoseconds of overvoltage onset. Use Value: Clamps peak voltage to ≤48.4 V, preventing damage to MCU power regulators and CAN transceivers downstream. |
Use Scenario: Safeguarding analog outputs of pressure sensors exposed to ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Unidirectional TVS connected between sensor output line and ground, absorbing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Limits transient-induced offset drift and latch-up risk in precision op-amp signal chains operating at ±10 V full scale. |
| Telecom DC Feeder Protection | Motor Drive Gate Driver Protection |
|
Use Scenario: Shielding PoE-powered Ethernet switches from lightning-induced surges on 48 V DC feeder lines. IC Role / Device Role / Timing Role: Primary shunt clamp on DC input rail upstream of DC/DC converters and Ethernet PHYs. Use Value: Absorbs 1500 W surge energy without degradation, maintaining system uptime during outdoor installation surges. |
Use Scenario: Protecting high-side N-channel MOSFET gate drivers in BLDC inverters from shoot-through-inducing voltage spikes. IC Role / Device Role / Timing Role: TVS placed between gate and source terminals to clamp Miller-induced dv/dt spikes during switching transitions. Use Value: Prevents false turn-on by limiting gate-source voltage to <48.4 V, preserving driver timing integrity and FET reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30AHE3_A/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Suitable only for lower-energy transients (IEC 61000-4-2 Level 2); not recommended for load dump or ISO 7637-2 Pulse 5a. | Select when board space is constrained and surge threat level is limited to ESD or minor switching noise. |
| SMCJ30AHE3_A/I | Same electrical specs but RoHS-compliant commercial grade (E3), not halogen-free or AEC-Q101 qualified | Lacks automotive qualification and halogen-free certification; acceptable for industrial/commercial use where those are not mandated. | Choose for cost-sensitive non-automotive designs requiring identical clamping and power ratings without AEC-Q101 traceability. |
Compared with SMCJ30AHM3_A/I, SMAJ30AHE3_A/I offers reduced surge capability in a smaller footprint, while SMCJ30AHE3_A/I matches performance but omits halogen-free and automotive qualifications - making SMCJ30AHM3_A/I the sole choice for AEC-Q101-compliant, environmentally regulated automotive deployments.
Availability
SMCJ30AHM3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom DC feeder safeguarding, and motor drive gate driver protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCJ30AHM3_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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SMCJ series was developed to deliver high-power transient suppression in compact SMC packages for automotive, industrial, and telecom applications demanding AEC-Q101 qualification and consistent clamping behavior under repetitive surge stress.
FAQ
What is the clamping voltage of the SMCJ30AHM3_A/I under a 10/1000 µs surge?
The SMCJ30AHM3_A/I clamps to a maximum of 48.4 V when subjected to its rated 31.0 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88394. The clamping voltage directly determines the maximum stress seen by downstream components during surge events, making it critical for validating protection margins in 24 V or 30 V systems.
Is the SMCJ30AHM3_A/I suitable for automotive applications?
Yes, the SMCJ30AHM3_A/I is AEC-Q101 qualified and specifically designated for automotive use via the "HM3" suffix, indicating halogen-free, RoHS-compliant, and automotive-grade construction. It has passed rigorous stress tests including temperature cycling, humidity bias, and mechanical shock - all documented in Vishay's qualification reports. Engineers deploying the SMCJ30AHM3_A/I in body control modules, ADAS power supplies, or infotainment systems can rely on its validated reliability under real-world vehicle conditions.
How does the SMCJ30AHM3_A/I differ from the SMCJ30AHE3_A/I?
The SMCJ30AHM3_A/I and SMCJ30AHE3_A/I share identical electrical specifications - including VWM = 30 V, VBR = 33.3–36.8 V, VC = 48.4 V, and PPPM = 1500 W - but differ in material compliance and qualification. The HM3 version is halogen-free and AEC-Q101 qualified; the HE3 version is RoHS-compliant but lacks halogen-free status and automotive qualification. Therefore, SMCJ30AHM3_A/I is mandatory for Tier 1 automotive programs requiring both environmental and reliability certifications.
What is the thermal resistance of the SMCJ30AHM3_A/I, and how does it affect layout design?
The SMCJ30AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes standard JEDEC test conditions and guides PCB layout: reducing RθJA requires increasing copper area or adding thermal vias. For sustained surge duty cycles or elevated ambient temperatures, designers must apply derating curves from Figure 2 of the datasheet to ensure TJ remains ≤150 °C - a key constraint for long-term reliability in enclosed enclosures.
Does the SMCJ30AHM3_A/I have polarity marking, and how is it identified?
Yes, the SMCJ30AHM3_A/I is a unidirectional TVS diode and features a visible cathode band on the SMC (DO-214AB) package body. This band identifies the cathode terminal, which must be connected to the system ground or lowest-potential reference point. The anode (unmarked end) connects to the line being protected. Correct orientation is essential: reverse installation renders the device ineffective against positive-going transients and may cause catastrophic failure under surge conditions. Polarity is confirmed in the mechanical drawings on page 5 of Vishay document 88394.
SMCJ30AHM3_A/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMCJ30AHM3_A/I FAQ
1.How can I place an order for SMCJ30AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30AHM3_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 SMCJ30AHM3_A/I reliable?
The price and inventory of SMCJ30AHM3_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 SMCJ30AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ30AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30AHM3_A/I?
SMCJ30AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30AHM3_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 SMCJ30AHM3_A/I?
For technical support, including SMCJ30AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30AHM3_A/I requirements.
6.How does Aetrix verify that SMCJ30AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ30AHM3_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 SMCJ30AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ30AHM3_A/I?
All SMCJ30AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30AHM3_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 SMCJ30AHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ30AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30AHM3_A/I Tags
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