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Vishay General Semiconductor - Diodes Division SMBJ48CAHM3/I
- Part No.:
- SMBJ48CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CAHM3/I.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,959
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Product details
Overview
SMBJ48CAHM3/I 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 power and signal lines. It features 48 V standoff voltage (VWM), 53.3–58.9 V breakdown range (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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom line cards.
For engineers reviewing the SMBJ48CAHM3/I datasheet, SMBJ48CAHM3/I pinout, SMBJ48CAHM3/I application, or SMBJ48CAHM3/I equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, AEC-Q101-qualified halogen-free construction, thermal resistance data, and real-world protection use cases - all aligned to Vishay's official 88392 document revision 09-Jan-2024.
Technical Context
This device operates as a bidirectional avalanche diode, symmetrically clamping transient overvoltages in both polarities without polarity marking. Its glass-passivated junction enables fast response time (<1 ns), low incremental surge resistance, and stable breakdown under repetitive 10/1000 µs pulses at 0.01% duty cycle.
Rated for -55 °C to +150 °C junction temperature, it delivers 77.4 V clamping at 7.8 A IPPM with 1.0 µA max reverse leakage at 48 V, and exhibits 0.103 %/°C temperature coefficient of VBR. The SMB package supports automated placement and meets MSL Level 1 (260 °C reflow peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 53.3 V / 58.9 V at 1 mA - guaranteed breakdown onset range defining turn-on threshold |
| VC @ IPPM | 77.4 V at 7.8 A - clamped voltage during 600 W transient, limiting stress on downstream ICs |
| PPPM | 600 W - peak pulse power handling with 10/1000 µs waveform, enabling robust surge immunity |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient, critical for derating above 25 °C ambient |
| TJ max | +150 °C - maximum allowable junction temperature, supporting industrial and automotive environments |
| Package | SMB (DO-214AA) - standardized 2-pin surface-mount outline with 5.59 mm max length and 2.20 mm max height |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; clamps positive or negative transients across the pair |
| Case (body) | Thermal and mechanical interface | Non-electrical; provides mechanical mounting and partial heat dissipation via copper pad contact |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) when properly mounted on 5 mm × 5 mm copper pads |
| AEC-Q101 qualified & halogen-free | Meets automotive reliability standards; HM3 suffix confirms halogen-free RoHS-compliant construction |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard 260 °C reflow without baking preconditioning |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes let-through voltage during transients, reducing risk of latch-up or gate oxide damage in protected FETs |
Applications
| Industrial Power Supply Input Protection | Automotive Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 24 V DC input rail exposed to load dump and inductive switching noise in PLC power modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp ±100 V transients within 1 ns. Use Value: Limits voltage seen by upstream DC-DC controller to ≤77.4 V, preventing overvoltage shutdown or damage. |
Use Scenario: CAN FD or LIN bus lines connecting engine control unit to pressure/temperature sensors. IC Role / Device Role / Timing Role: Low-capacitance TVS on differential pair to suppress ESD and coupled transients without distorting signal edges. Use Value: Maintains signal integrity up to 5 Mbps while surviving ISO 10605 ±30 kV contact discharge events. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: 48 V phantom-powered Ethernet or PoE+ interfaces subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on power feed line before DC-DC conversion stage. Use Value: Absorbs 600 W surge energy per event, enabling compliance with GR-1089-CORE Level 3 (10/1000 µs, 100 A) |
Use Scenario: H-bridge gate driver supply rails in smart washing machine motor controllers. IC Role / Device Role / Timing Role: Bidirectional suppression of flyback spikes from brushed DC motor commutation. Use Value: Prevents false triggering of overvoltage protection in gate drivers and extends MOSFET lifetime under 100,000-cycle operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CAHE3/I | Same electrical specs, but RoHS-compliant commercial grade (non-halogen-free); lacks AEC-Q101 qualification | Acceptable for non-automotive industrial designs where halogen content is unrestricted | Select when cost sensitivity outweighs halogen-free requirement and automotive qualification is unnecessary |
| SMAJ48CAHM3 | Lower 400 W PPPM, same VWM/VC; SMA package (smaller footprint, higher RθJA = 140 °C/W) | Suitable only for lower-energy transients or space-constrained PCBs with adequate thermal relief | Choose only if board area is critical and surge threat level is limited to IEC 61000-4-5 Level 2 (1 kV) |
Compared with SMBJ48CAHM3/I, the HE3/I variant trades halogen-free compliance and automotive qualification for lower cost, while the SMAJ48CAHM3 reduces surge capacity and thermal performance to fit smaller layouts - making SMBJ48CAHM3/I the optimal choice for high-reliability, AEC-Q101-mandated, or full-Level-4 surge environments.
Availability
SMBJ48CAHM3/I is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, telecom line cards, and consumer appliance motor drives requiring stable component supply with halogen-free and AEC-Q101-qualified assurance.
Supply support for SMBJ48CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-energy transient suppression in harsh environments - engineered for consistent clamping performance, low leakage, and long-term stability in automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMBJ48CAHM3/I at its rated peak pulse current?
The SMBJ48CAHM3/I has a maximum clamping voltage (VC) of 77.4 V at 7.8 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value ensures protected circuitry remains below critical overvoltage thresholds during surge events. The SMBJ48CAHM3/I's low clamping ratio (VC/VBR ≈ 1.37) reflects strong avalanche uniformity and minimal let-through stress.
Is SMBJ48CAHM3/I suitable for automotive applications?
Yes, SMBJ48CAHM3/I is AEC-Q101 qualified and built with halogen-free, RoHS-compliant materials (HM3 suffix), making it suitable for automotive powertrain, body electronics, and ADAS sensor protection. Its -55 °C to +150 °C operating range and validated surge performance align with automotive environmental and reliability requirements - confirmed in Vishay's official documentation for SMBJ48CAHM3/I.
How does the bidirectional design of SMBJ48CAHM3/I affect PCB layout?
The SMBJ48CAHM3/I has no polarity marking and identical electrical behavior in both directions, simplifying layout by eliminating orientation checks during placement. Engineers route it symmetrically across protected lines (e.g., differential pairs or AC inputs), with equal copper pad area (0.2" × 0.2") on both terminals to ensure balanced thermal dissipation and consistent clamping. This symmetry is intrinsic to SMBJ48CAHM3/I's bidirectional architecture.
What is the maximum reverse leakage current for SMBJ48CAHM3/I at its standoff voltage?
At 48 V (VWM) and 25 °C, the SMBJ48CAHM3/I exhibits a maximum reverse leakage current (ID) of 1.0 µA. This ultra-low leakage preserves system efficiency in always-on circuits and avoids false triggering in high-impedance monitoring paths - a key specification verified in Vishay's SMBJ5.0A–SMBJ188A datasheet (Doc #88392) for SMBJ48CAHM3/I.
Does SMBJ48CAHM3/I require derating at elevated ambient temperatures?
Yes, SMBJ48CAHM3/I must be derated above 25 °C ambient per Figure 2 in Vishay's datasheet. With RθJA = 100 °C/W, its peak pulse power drops linearly: at 75 °C ambient, usable PPPM falls to ~400 W. Designers must apply this derating when deploying SMBJ48CAHM3/I in enclosed enclosures or near heat sources - a requirement explicitly defined for SMBJ48CAHM3/I in its thermal characteristics table.
SMBJ48CAHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMBJ48CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CAHM3/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 SMBJ48CAHM3/I reliable?
The price and inventory of SMBJ48CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ48CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CAHM3/I?
SMBJ48CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CAHM3/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 SMBJ48CAHM3/I?
For technical support, including SMBJ48CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CAHM3/I requirements.
6.How does Aetrix verify that SMBJ48CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ48CAHM3/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 SMBJ48CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ48CAHM3/I?
All SMBJ48CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CAHM3/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 SMBJ48CAHM3/I part is unused and in its original packaging.
Return procedure for SMBJ48CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48CAHM3/I Tags
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