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Vishay General Semiconductor - Diodes Division SMBJ48CAHM3_A/H
- Part No.:
- SMBJ48CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CAHM3_A/H.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,077
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Product details
Overview
SMBJ48CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features 48 V standoff voltage (VWM), 53.3–58.9 V breakdown voltage (VBR at 1 mA), 77.4 V maximum clamping voltage (VC) at 7.8 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ48CAHM3_A/H datasheet, SMBJ48CAHM3_A/H pinout, SMBJ48CAHM3_A/H application, or SMBJ48CAHM3_A/H equivalent, this device is selected for robust ESD and surge immunity in bidirectional AC-coupled or floating signal paths where low-leakage (<1.0 µA at VWM) and fast response (<1 ps) are critical to IC-level protection of MOSFET gates and analog front-ends.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VC, and IPPM specifications in forward and reverse directions. Its glass-passivated junction ensures stable leakage performance and repeatable clamping behavior under repetitive surge stress.
Thermal design relies on RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), requiring minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated 600 W pulse handling. The device is halogen-free, RoHS-compliant, and qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe operating margin for 48 V nominal systems. |
| VBR (min/max) | 53.3 V / 58.9 V at 1 mA - Breakdown threshold range ensuring consistent clamping onset across production lots. |
| VC @ IPPM | 77.4 V at 7.8 A - Clamped voltage during 10/1000 µs surge; limits downstream voltage stress to <78 V. |
| PPPM | 600 W - Peak pulse power dissipation capability; supports IEC 61000-4-5 Level 4 (4 kV) surge testing when properly mounted. |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage at standoff voltage; avoids loading of high-impedance sensor or reference circuits. |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in under-hood or enclosed industrial enclosures. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals with identical electrical behavior in either direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Either terminal serves as input/output for transient energy; no cathode band marking required; enables placement flexibility on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity requirements up to 4 kV in properly laid-out designs. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage overshoot during clamping, reducing risk of damage to protected ICs such as RS-485 transceivers. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including infotainment and body control modules requiring extended temperature and life-cycle reliability. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for global electronics manufacturing without compromising surge performance. |
| MSL Level 1 (260 °C reflow) | Supports standard lead-free SMT assembly processes without moisture sensitivity concerns or baking requirements. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop sensors and analog voltage outputs from inductive switching transients in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across differential signal pair or supply rail to shunt surge energy before it reaches precision ADC or op-amp inputs. Use Value: Maintains signal integrity by limiting transient-induced offset errors and preventing latch-up in downstream instrumentation amplifiers. |
Use Scenario: Shielding RS-485/RS-422 data lines in base station backhaul equipment exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary TVS on differential bus lines, positioned before line driver/receiver ICs to absorb common-mode and differential-mode transients. Use Value: Ensures uninterrupted communication during 4 kV contact discharge events per IEC 61000-4-5, avoiding link resets or data corruption. |
| Automotive Body Control Module | Consumer Power Adapter Input Stage |
|
Use Scenario: Safeguarding LIN bus nodes and LED driver control lines in door module ECUs subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Secondary-level transient suppressor after primary LC filter, clamping residual spikes that pass through bulk filtering. Use Value: Prevents false wake-up or reset of microcontrollers due to voltage excursions exceeding 77.4 V during battery transients. |
Use Scenario: Input-stage surge suppression on AC-DC adapter secondary-side DC output rails feeding USB-C PD controllers or charging ICs. IC Role / Device Role / Timing Role: Fast-acting clamp across +VOUT/GND to limit overvoltage from capacitor discharge or transformer ringing. Use Value: Avoids overvoltage shutdown or permanent damage to sensitive USB PD policy engines operating at tight ±5% tolerance windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA-E3/52 | RoHS-compliant commercial grade (non-automotive); same VWM, VBR, VC, and PPPM; no AEC-Q101 qualification. | Lacks automotive reliability validation; suitable for consumer or industrial non-safety-critical use only. | Select when cost sensitivity outweighs automotive qualification requirements and thermal cycling/lifetime demands are moderate. |
| SAC48CA | Same VWM and VC, but lower PPPM (400 W); smaller SOD-123FL package; higher RθJA (150 °C/W). | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy transients in space-constrained portable devices. | Choose only for compact, low-power applications where 400 W pulse handling suffices and PCB area is severely constrained. |
Compared with SMBJ48CA-E3/52, SMBJ48CAHM3_A/H adds AEC-Q101 qualification and halogen-free construction for automotive deployment, while SAC48CA trades pulse power and thermal robustness for miniaturization - making SMBJ48CAHM3_A/H the sole choice for high-reliability 600 W bidirectional clamping in harsh environments.
Availability
SMBJ48CAHM3_A/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and consumer power adapter input stages requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMBJ48CAHM3_A/H 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 application-specific optimization.
The SMBJ series targets high-energy transient suppression in demanding environments - engineered for rapid response, low clamping voltage, and robust thermal performance in automotive, industrial, and telecom infrastructure.
FAQ
What is the maximum clamping voltage of SMBJ48CAHM3_A/H at its rated peak pulse current?
The SMBJ48CAHM3_A/H has a maximum clamping voltage (VC) of 77.4 V at its rated peak pulse current (IPPM) of 7.8 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 confirmed in the Vishay datasheet revision 09-Jan-2024, page 2.
Is SMBJ48CAHM3_A/H suitable for automotive applications?
Yes, SMBJ48CAHM3_A/H is AEC-Q101 qualified (indicated by the HM3 suffix), making it suitable for automotive applications including body control modules, infotainment systems, and LIN bus protection. Its halogen-free, RoHS-compliant construction and guaranteed operation from –55 °C to +150 °C meet stringent automotive reliability and environmental requirements.
How does the bidirectional configuration of SMBJ48CAHM3_A/H affect PCB layout?
The bidirectional configuration of SMBJ48CAHM3_A/H eliminates polarity constraints - neither terminal is marked, and either can connect to line or return. This simplifies PCB layout by removing orientation checks during automated assembly and allows flexible placement across differential pairs or floating rails without concern for anode/cathode alignment.
What is the reverse leakage current of SMBJ48CAHM3_A/H at its standoff voltage?
At its 48 V standoff voltage (VWM), SMBJ48CAHM3_A/H exhibits a maximum reverse leakage current (ID) of 1.0 µA at 25 °C, as specified in the Vishay SMBJ5.0A–SMBJ188A datasheet. This ultra-low leakage prevents unwanted loading of high-impedance circuits such as sensor bias networks or reference dividers.
Does SMBJ48CAHM3_A/H require special PCB pad design for thermal performance?
Yes - to sustain its rated 600 W peak pulse power, SMBJ48CAHM3_A/H requires minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads on each terminal, per Vishay's thermal derating guidelines. Smaller pads reduce heat dissipation, causing premature thermal runaway during repetitive surges and degrading long-term reliability.
SMBJ48CAHM3_A/H 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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- 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)
SMBJ48CAHM3_A/H FAQ
1.How can I place an order for SMBJ48CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CAHM3_A/H 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 SMBJ48CAHM3_A/H reliable?
The price and inventory of SMBJ48CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ48CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CAHM3_A/H?
SMBJ48CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CAHM3_A/H 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 SMBJ48CAHM3_A/H?
For technical support, including SMBJ48CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ48CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ48CAHM3_A/H 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 SMBJ48CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ48CAHM3_A/H?
All SMBJ48CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CAHM3_A/H, 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 SMBJ48CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMBJ48CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48CAHM3_A/H Tags
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