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Vishay General Semiconductor - Diodes Division SMBJ30CAHM3_A/I
- Part No.:
- SMBJ30CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30CAHM3_A/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,197
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Product details
Overview
SMBJ30CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 30 V standoff voltage (VWM), 48.4 V maximum clamping voltage (VC) at 12.4 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), commonly deployed to protect MOSFETs and sensor interfaces in industrial motor drives.
For engineers reviewing the SMBJ30CAHM3_A/I datasheet, SMBJ30CAHM3_A/I pinout, SMBJ30CAHM3_A/I application, or SMBJ30CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance, and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout conditions.
Technical Context
This device operates as a voltage-clamping protection element with symmetrical breakdown behavior in both polarities due to its bidirectional construction. Its glass-passivated junction ensures stable avalanche characteristics, while the low incremental surge resistance enables consistent clamping performance across repetitive transient events.
The SMBJ30CAHM3_A/I is rated for operation from −55 °C to +150 °C junction temperature and meets MSL Level 1 per J-STD-020 with a 260 °C reflow peak. Its 100 A IFSM rating (unidirectional only) does not apply; as a bidirectional part, it relies solely on IPPM = 12.4 A and VC = 48.4 V for surge coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit of normal circuit operation. |
| VBR min / max | 33.3 V / 36.8 V - Breakdown voltage range at 1 mA test current; ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 48.4 V - Clamped voltage at 12.4 A peak pulse current (10/1000 µs); determines protected circuit's maximum transient exposure. |
| PPPM | 600 W - Peak pulse power handling (10/1000 µs); supports robust protection against lightning-induced surges and inductive switching spikes. |
| IPPM | 12.4 A - Maximum non-repetitive peak pulse current; used with VC to calculate worst-case energy dissipation. |
| TJ max | +150 °C - Maximum junction temperature; sets thermal derating boundary for sustained power dissipation and ambient design limits. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; critical for PCB layout and thermal management. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated terminals solderable per J-STD-002 and JESD 22-B102. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical avalanche junction; conducts during negative transients relative to cathode reference. |
| Cathode | Transient current entry (positive polarity) | Second terminal of symmetrical avalanche junction; conducts during positive transients relative to anode reference. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for industrial and automotive end equipment with no brominated flame retardants. |
| 600 W peak pulse power | Supports IEC 61000-4-5 Level 3 (1 kV line-to-line, 2 kV line-to-earth) surge immunity with margin. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping, reducing stress on downstream ICs such as microcontrollers or analog front-ends. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and current-sense amplifier inputs against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Voltage clamping element placed directly at MOSFET gate-source or op-amp input nodes. Use Value: Limits transient excursions to ≤48.4 V, preventing latch-up or oxide breakdown in 30 V-rated control ICs. |
Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Bidirectional shunt protector co-located with connector entry points. Use Value: Withstands 12.4 A pulses without degradation, maintaining signal integrity during ISO 7637-2 Pulse 1/2a/5a events. |
| Telecom Power Interfaces | Consumer Appliance Control Boards |
|
Use Scenario: Input-stage protection for DC-DC converters powering baseband processors in small-cell radio units. IC Role / Device Role / Timing Role: Primary transient clamp on 24–48 V input rails upstream of primary FETs. Use Value: 600 W rating accommodates high-energy surges from shared building power distribution systems. |
Use Scenario: Overvoltage safeguard for microcontroller I/O pins connected to push-button or rotary encoder circuits. IC Role / Device Role / Timing Role: Localized TVS adjacent to connectors and mechanical switches. Use Value: Fast response time (<1 ps) prevents ESD damage to 5 V logic inputs during user interaction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CAHE3_A/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable where halogen content is unrestricted; identical thermal and clamping performance. | Select SMBJ30CAHE3_A/I when halogen-free requirement is waived and cost optimization is prioritized. |
| SAC30CA | Same VWM and VC, but SOD-123FL package (smaller footprint, higher RθJA ≈ 190 °C/W). | Limited to lower-duty-cycle transients due to reduced thermal mass; unsuitable for repetitive surge environments. | Choose SAC30CA only for space-constrained designs with infrequent, low-energy transients and verified thermal margin. |
Compared with SMBJ30CAHE3_A/I, the SMBJ30CAHM3_A/I adds halogen-free compliance without sacrificing clamping performance or qualification status; versus SAC30CA, it delivers superior thermal robustness and surge endurance in the larger SMB package-critical for industrial and automotive deployments.
Availability
SMBJ30CAHM3_A/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power interfaces requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMBJ30CAHM3_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 validation.
The SMBJ series was engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where failure modes must be mitigated without compromising signal fidelity or thermal stability.
FAQ
What is the maximum clamping voltage of SMBJ30CAHM3_A/I at its rated peak pulse current?
The SMBJ30CAHM3_A/I has a maximum clamping voltage (VC) of 48.4 V at its rated peak pulse current (IPPM) of 12.4 A under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ30CAHM3_A/I maintains this clamping performance across its full operating temperature range.
Is SMBJ30CAHM3_A/I suitable for automotive applications?
Yes, SMBJ30CAHM3_A/I is AEC-Q101 qualified and specifically designated for automotive use with ordering code suffix HM3_X. It undergoes stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD verification per the AEC-Q101 standard. Its halogen-free, RoHS-compliant construction and −55 °C to +150 °C operating range make SMBJ30CAHM3_A/I appropriate for body control modules, lighting drivers, and infotainment power rails.
How does the bidirectional configuration of SMBJ30CAHM3_A/I affect its circuit placement?
The bidirectional configuration of SMBJ30CAHM3_A/I eliminates polarity sensitivity, allowing placement across any two points subject to differential transients-such as AC signal lines, differential buses (LIN, RS-485), or floating sensor outputs-without regard to anode/cathode orientation. Unlike unidirectional TVS diodes, SMBJ30CAHM3_A/I requires no ground reference for operation and provides symmetrical clamping in both directions, simplifying layout and reducing BOM count.
What is the thermal resistance of SMBJ30CAHM3_A/I, and how does it impact PCB layout?
SMBJ30CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay specification. To maintain safe junction temperatures during repetitive surges, designers must allocate adequate copper area and avoid excessive trace length or isolation; doubling pad size reduces RθJA by ~15–20%, directly improving SMBJ30CAHM3_A/I's surge endurance.
Does SMBJ30CAHM3_A/I have a specified junction capacitance, and is it suitable for high-speed data lines?
No, the SMBJ30CAHM3_A/I datasheet does not specify junction capacitance (CJ) for this variant. While Figure 4 in the family datasheet shows typical CJ trends (e.g., ~200 pF at 0 V for VWM = 30 V parts), that curve applies to unidirectional versions and is not validated for SMBJ30CAHM3_A/I. Due to its relatively high capacitance and lack of published high-frequency characterization, SMBJ30CAHM3_A/I is not recommended for USB, HDMI, or other >10 Mbps data lines; use low-capacitance TVS arrays instead.
SMBJ30CAHM3_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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 12.4A
- 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)
SMBJ30CAHM3_A/I FAQ
1.How can I place an order for SMBJ30CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30CAHM3_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 SMBJ30CAHM3_A/I reliable?
The price and inventory of SMBJ30CAHM3_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 SMBJ30CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ30CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30CAHM3_A/I?
SMBJ30CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30CAHM3_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 SMBJ30CAHM3_A/I?
For technical support, including SMBJ30CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ30CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ30CAHM3_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 SMBJ30CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ30CAHM3_A/I?
All SMBJ30CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30CAHM3_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 SMBJ30CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ30CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30CAHM3_A/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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