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Vishay General Semiconductor - Diodes Division SMCJ30A-M3/57T
- Part No.:
- SMCJ30A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30A-M3/57T.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ30A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features a 30 V standoff voltage (VWM), 33.3–36.8 V breakdown voltage (VBR) at 1 mA, 48.4 V maximum clamping voltage (VC) at 31 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive power rail protection and industrial sensor interface circuits.
For engineers reviewing the SMCJ30A-M3/57T datasheet, SMCJ30A-M3/57T pinout, SMCJ30A-M3/57T application, or SMCJ30A-M3/57T equivalent, key selection criteria include verified clamping performance under 31 A surge, thermal resistance (RθJA = 75 °C/W), halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ30A-M3/57T operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown behavior and low incremental surge resistance. Its clamping action begins at VBR ≥ 33.3 V and limits transient voltages to ≤ 48.4 V at 31 A, enabling robust protection of downstream MOSFETs and ICs against inductive switching spikes and ESD events.
It meets J-STD-020 MSL Level 1 moisture sensitivity, supports 260 °C lead-free reflow, and exhibits a temperature coefficient of VBR at +0.099 %/°C - ensuring predictable voltage shift across its -55 °C to +150 °C operating junction range. Polarity is marked by a cathode band; no marking applies to bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse working voltage before leakage exceeds 1 μA; defines safe operating margin below clamping threshold |
| VBR (min/max) | 33.3 V / 36.8 V at IT = 1 mA - guaranteed avalanche onset range; ensures consistent turn-on across production lots |
| VC @ IPPM | 48.4 V at 31 A (10/1000 μs) - peak clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 1500 W - transient energy handling capacity; enables single-device protection against IEC 61000-4-5 Level 4 surges |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard 8.0 mm × 8.0 mm pads; informs derating above 25 °C ambient |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 2.06 mm height and 7.75 mm length; compatible with automated pick-and-place |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix); meets UL 94 V-0 flammability; JEDEC JESD201 Class 2 whisker resistance |
Pinout & Package
SMCJ30A-M3/57T uses the SMC (DO-214AB) package: a surface-mount, molded plastic case with two coplanar matte tin-plated leads. The cathode is identified by a band on the body end; anode is the opposite terminal. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return; completes clamping loop during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables single-device protection against high-energy transients (e.g., ISO 7637-2 Pulse 5a) without external series impedance |
| 48.4 V clamping at 31 A | Limits stress on 3.3 V/5 V/12 V logic and power rails - keeps protected ICs within absolute maximum ratings during surge |
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature; eliminates risk of junction degradation under repeated surge stress |
| MSL Level 1 rating | Allows unlimited floor life and direct placement into lead-free reflow without baking - reduces manufacturing overhead |
| Halogen-free & RoHS-compliant (M3) | Meets global environmental regulations and supports green supply chain requirements for automotive and industrial OEMs |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppresses load dump and alternator ripple transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground, acting as fast-acting shunt clamp during >40 V surges. Use Value: Prevents latch-up or permanent damage to voltage regulators and microcontrollers exposed to ISO 16750-2 pulses up to 120 V/100 ms. |
Use Scenario: Shields analog front-end inputs of pressure/temperature sensors in PLC I/O modules from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff-mode protector on signal lines, conducting only during transient excursions beyond 30 V. Use Value: Maintains <1 μA leakage at 30 V, preserving sensor accuracy while clamping 31 A surges to ≤48.4 V within nanoseconds. |
| Telecom DC Power Input Protection | Consumer Power Adapter Output Clamping |
|
Use Scenario: Guards PoE-powered switch ports and base station RF module DC feeds against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 48 V DC input, coordinated with upstream fuse and common-mode chokes. Use Value: Withstands 1500 W peak pulses per IEC 61000-4-5 Combination Wave, reducing need for multi-stage protection networks. |
Use Scenario: Protects USB-C PD and AC/DC adapter outputs from output short-circuit recovery spikes and capacitor discharge transients. IC Role / Device Role / Timing Role: Final-stage transient suppressor placed immediately before connector, limiting voltage overshoot during hot-plug events. Use Value: Fast response (<1 ns) and low clamping voltage ensure connected devices (e.g., smartphones, laptops) remain within safe input voltage windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-M3/57T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Suitable for lower-energy surges (IEC 61000-4-2 ESD only); not rated for IEC 61000-4-5 | Select when board space is constrained and surge threat level is limited to ESD or low-energy switching noise. |
| SMCJ30CA-M3/57T | Bidirectional variant; same VWM (30 V), symmetric clamping in both polarities; identical PPPM and VC | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, CAN bus) | Choose when protecting differential or AC signals - SMCJ30A-M3/57T is unsuitable due to unidirectional polarity. |
Compared with SMAJ30A-M3/57T, the SMCJ30A-M3/57T delivers 3.75× higher surge power handling and superior thermal performance; versus SMCJ30CA-M3/57T, it offers lower cost and simpler grounding for DC-biased rails but cannot protect bidirectional waveforms.
Availability
SMCJ30A-M3/57T is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom DC power input protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMCJ30A-M3/57T 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, efficiency, and application-specific optimization.
The SMCJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure tolerance and long-term stability are critical.
FAQ
What is the maximum clamping voltage of the SMCJ30A-M3/57T under rated surge conditions?
The SMCJ30A-M3/57T has a maximum clamping voltage (VC) of 48.4 V when subjected to a 10/1000 μs waveform peak pulse current (IPPM) of 31 A. This value is measured per ANSI/IEEE C62.35 standards and represents the highest voltage the device allows across its terminals during a defined transient event - directly protecting downstream components such as microcontrollers or power management ICs connected to the same rail. The SMCJ30A-M3/57T maintains this clamping performance consistently across its qualified temperature range.
Is the SMCJ30A-M3/57T suitable for automotive applications requiring AEC-Q101 qualification?
No, the SMCJ30A-M3/57T is not AEC-Q101 qualified. It carries the M3 suffix indicating halogen-free and RoHS compliance, but lacks the HM3 or HE3 suffix required for automotive-grade qualification. For AEC-Q101-compliant alternatives, engineers should select SMCJ30A-HM3/57T - which shares identical electrical specs but adds stress testing per AEC-Q101 Rev D. The SMCJ30A-M3/57T remains appropriate for commercial and industrial applications where automotive qualification is not mandated.
How does the SMCJ30A-M3/57T differ from the SMCJ30CA-M3/57T?
The SMCJ30A-M3/57T is unidirectional, with polarity marked by a cathode band and intended for DC-biased lines grounded at one end; the SMCJ30CA-M3/57T is bidirectional, with no polarity marking and symmetrical clamping in both directions. Both share identical VWM (30 V), PPPM (1500 W), and VC (48.4 V), but the CA version supports AC-coupled or floating interfaces like RS-485 or CAN bus. Using SMCJ30A-M3/57T in place of SMCJ30CA-M3/57T on bidirectional lines risks failure during negative transients - the SMCJ30A-M3/57T will not conduct.
What PCB layout guidelines apply to the SMCJ30A-M3/57T for optimal thermal and surge performance?
For rated 1500 W pulse handling, the SMCJ30A-M3/57T must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in Vishay's datasheet Figure 2 derating curves. Traces to ground should be short and wide to minimize inductance; avoid vias in the main surge path. Thermal relief is discouraged - solid copper connections maximize heat dissipation. The SMCJ30A-M3/57T achieves RθJA = 75 °C/W only with this layout; reduced pad area increases junction temperature and degrades surge capability.
Does the SMCJ30A-M3/57T have a specified junction capacitance for high-speed signal line protection?
No, junction capacitance (CJ) is not specified for the SMCJ30A-M3/57T in the official Vishay datasheet (Document Number: 88394). While Fig. 4 shows typical CJ curves for unidirectional SMCJ devices, values are only provided for VWM ≤ 24 V parts (e.g., SMCJ24A). At 30 V VWM, CJ is not characterized - making the SMCJ30A-M3/57T unsuitable for high-frequency signal lines (e.g., USB 2.0, HDMI) where capacitance must be <10 pF. For such applications, consider low-capacitance TVS arrays or specialized ESD protection devices instead of the SMCJ30A-M3/57T.
SMCJ30A-M3/57T 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ30A-M3/57T FAQ
1.How can I place an order for SMCJ30A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30A-M3/57T 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 SMCJ30A-M3/57T reliable?
The price and inventory of SMCJ30A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ30A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30A-M3/57T?
SMCJ30A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30A-M3/57T 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 SMCJ30A-M3/57T?
For technical support, including SMCJ30A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30A-M3/57T requirements.
6.How does Aetrix verify that SMCJ30A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ30A-M3/57T 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 SMCJ30A-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ30A-M3/57T?
All SMCJ30A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30A-M3/57T, 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 SMCJ30A-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ30A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30A-M3/57T Tags
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