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Vishay General Semiconductor - Diodes Division SMCJ30CAHM3/I
- Part No.:
- SMCJ30CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30CAHM3/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,009
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Product details
Overview
SMCJ30CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 30 V standoff voltage (VWM), 48.4 V maximum clamping voltage (VC) at 31.0 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed across automotive sensor signal lines, industrial I/O ports, and telecom interface protection.
For engineers reviewing the SMCJ30CAHM3/I datasheet, SMCJ30CAHM3/I pinout, SMCJ30CAHM3/I application, or SMCJ30CAHM3/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), junction temperature derating above 25 °C, and thermal resistance (RθJA = 75 °C/W) under standard PCB pad layout.
Technical Context
The SMCJ30CAHM3/I operates as a silicon avalanche diode with glass-passivated junction, delivering symmetrical clamping in both polarities due to its bidirectional construction. Its low incremental surge resistance and fast response time (<1 ns) enable effective suppression of ESD, lightning-induced transients, and inductive switching spikes without latch-up or degradation under repetitive stress.
Designed for surface-mount automation, it meets J-STD-020 MSL Level 1 (peak reflow 260 °C) and JESD201 Class 2 whisker resistance. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - critical for automotive-grade reliability in engine control units and ADAS sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (Breakdown Voltage) | 33.3–36.8 V at 1.0 mA - guaranteed avalanche conduction threshold in both directions |
| VC (Clamping Voltage) | 48.4 V at IPPM = 31.0 A - peak voltage seen by protected circuit during 10/1000 μs surge |
| PPPM (Peak Pulse Power) | 1500 W - surge energy handling capability per single 10/1000 μs transient event |
| ID (Reverse Leakage) | 1.0 μA max at VWM - minimal DC loading on signal or power rail during normal operation |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 75 °C/W - thermal resistance from junction to ambient on standard 8.0 mm × 8.0 mm copper pads |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional device with no polarity marking - terminals are symmetric anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (both ends) | Bidirectional avalanche junction terminals | Identical electrical behavior in either direction; no cathode band marking; mounted on equal-area copper pads for balanced thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards and end-of-life recycling requirements |
| Low-profile SMC package | Enables high-density PCB layouts while maintaining 1500 W surge rating and thermal performance |
| Fast response time & low clamping ratio | Clamps within <1 ns; VC/VWM = 1.61 ensures minimal overvoltage exposure to downstream ICs |
| MSL Level 1 moisture sensitivity | Allows direct placement without baking; compatible with standard lead-free reflow profiles up to 260 °C |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt transients before reaching signal conditioning circuitry. Use Value: Maintains signal integrity under 100 V/50 ms load dump events while surviving >1000 surges per AEC-Q101 stress test. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring induced surges and ground bounce. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact or optocoupler input side, coordinated with series current-limiting resistor. Use Value: Limits transient voltage to ≤48.4 V, preventing damage to microcontroller GPIOs rated for 3.3 V or 5 V logic levels. |
| Telecom Interface Protection | Consumer Power Adapter ESD Guard |
Use Scenario: Shielding RS-485/RS-422 differential data lines in base station backhaul equipment from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Paired bidirectional TVS devices across differential pairs, referenced to local ground plane. Use Value: Symmetrical clamping preserves differential signal swing while absorbing ≥1500 W common-mode energy without skew or distortion. |
Use Scenario: Adding secondary-level surge immunity to USB-C and barrel-jack DC inputs in smart home hubs and audio amplifiers. IC Role / Device Role / Timing Role: Final-stage protector after primary MOV/fuse, placed adjacent to input connector to minimize trace inductance. Use Value: Halogen-free HM3 construction supports consumer safety certifications; 1.0 μA leakage avoids standby power drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CAHE3/A | Same VWM (30 V), lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Not AEC-Q101 qualified; suited for cost-sensitive consumer designs with lower surge exposure | Select when board space is constrained and automotive qualification is unnecessary |
| SMCJ33CAHM3/I | Higher VWM (33 V), VBR 36.7–40.6 V, same SMC package and HM3 qualification | Provides margin for systems with nominal 28 V rails subject to ±10 % tolerance drift | Choose for 24 V automotive systems requiring tighter clamping headroom above nominal supply |
Compared with SMCJ30CAHM3/I, SMAJ30CAHE3/A trades surge robustness and automotive qualification for smaller size, while SMCJ33CAHM3/I offers higher standoff voltage for systems needing greater DC margin - both retain identical halogen-free and RoHS compliance but differ in thermal and surge capacity.
Availability
SMCJ30CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC development, and telecom infrastructure projects requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMCJ30CAHM3/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMCJ series targets high-energy transient suppression in harsh environments, with the HM3 variant specifically engineered for automotive-grade durability, thermal stability, and regulatory compliance.
FAQ
What is the clamping voltage of SMCJ30CAHM3/I at its rated peak pulse current?
The SMCJ30CAHM3/I has a maximum clamping voltage (VC) of 48.4 V at its rated peak pulse current (IPPM) of 31.0 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is verified per ANSI/IEEE C62.35. The SMCJ30CAHM3/I maintains this clamping performance across its full operating temperature range.
Is SMCJ30CAHM3/I qualified for automotive applications?
Yes, SMCJ30CAHM3/I is AEC-Q101 qualified, as confirmed by the HM3 suffix in its ordering code. This qualification covers stress tests including high-temperature operating life, temperature cycling, and surge robustness - making it suitable for under-hood and cabin-mounted automotive electronics such as engine control modules, ADAS camera interfaces, and body control units. The SMCJ30CAHM3/I also meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow requirements.
How does the HM3 suffix differ from the M3 or HE3 suffixes in the SMCJ family?
The HM3 suffix on SMCJ30CAHM3/I denotes halogen-free, RoHS-compliant construction *and* AEC-Q101 qualification - a dual requirement not met by M3 (halogen-free + RoHS only) or HE3 (RoHS + AEC-Q101, but not halogen-free). This makes SMCJ30CAHM3/I uniquely compliant with both automotive reliability standards and stringent environmental regulations like China RoHS II and EU ELV. All three variants share the same SMC package and electrical specs, but only HM3 satisfies full Tier-1 automotive procurement mandates.
What is the thermal resistance of SMCJ30CAHM3/I, and how does it affect PCB layout?
The SMCJ30CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal, per Vishay's recommended layout. This value assumes no additional heatsinking; reducing pad area or omitting thermal vias increases RθJA and risks exceeding the +150 °C maximum junction temperature during repeated surges. For high-duty-cycle applications, designers should use minimum 2 oz copper, multiple thermal vias under each pad, and avoid routing heat-sensitive components nearby.
Can SMCJ30CAHM3/I be used in bidirectional signal line protection without polarity concerns?
Yes, SMCJ30CAHM3/I is explicitly designed for bidirectional protection: its CA suffix indicates symmetrical avalanche characteristics in both directions, with identical VBR (33.3–36.8 V), VC (48.4 V), and IPPM (31.0 A) ratings regardless of voltage polarity. Unlike unidirectional TVS diodes, it carries no cathode band marking and requires no orientation during placement - simplifying assembly and eliminating risk of reverse installation on differential or AC-coupled signal paths such as RS-485, CAN FD, or audio lines.
SMCJ30CAHM3/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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ30CAHM3/I FAQ
1.How can I place an order for SMCJ30CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30CAHM3/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 SMCJ30CAHM3/I reliable?
The price and inventory of SMCJ30CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ30CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30CAHM3/I?
SMCJ30CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30CAHM3/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 SMCJ30CAHM3/I?
For technical support, including SMCJ30CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30CAHM3/I requirements.
6.How does Aetrix verify that SMCJ30CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ30CAHM3/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 SMCJ30CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ30CAHM3/I?
All SMCJ30CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30CAHM3/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 SMCJ30CAHM3/I part is unused and in its original packaging.
Return procedure for SMCJ30CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30CAHM3/I Tags
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