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Vishay General Semiconductor - Diodes Division SMBJ48CAHM3_A/I
- Part No.:
- SMBJ48CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CAHM3_A/I.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,855
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Product details
Overview
SMBJ48CAHM3_A/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_A/I datasheet, SMBJ48CAHM3_A/I pinout, SMBJ48CAHM3_A/I application, or SMBJ48CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.61), halogen-free RoHS-compliant construction (HM3 suffix), AEC-Q101 qualification readiness, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both directions, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ns), while the low incremental surge resistance supports effective energy diversion during ESD or lightning-induced surges.
The SMBJ48CAHM3_A/I is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient per Figure 2. Thermal resistance is 100 °C/W (junction-to-ambient, typical) and 20 °C/W (junction-to-lead), confirming suitability for moderate-power board-level protection without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 48 V nominal systems. |
| VBR min/max | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering across process variation and temperature. |
| VC @ IPPM | 77.4 V at 7.8 A - Clamped voltage under 600 W 10/1000 µs surge; limits downstream stress to <1.62× VWM. |
| PPPM | 600 W - Peak pulse power handling with 0.01% duty cycle; sufficient for IEC 61000-4-5 Level 4 (4 kV) surge events. |
| IDR @ VWM | <1.0 µA - Ultra-low reverse leakage at standoff voltage; avoids loading sensitive 48 V bias or reference rails. |
| TJ max | +150 °C - Extended thermal rating enables use in enclosed industrial enclosures or near heat-generating components. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline with 5.59 mm × 4.06 mm footprint; compatible with IPC-7351B land pattern. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are functionally symmetric; both leads serve as interchangeable surge current paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry (negative transient) | Accepts reverse surge current during negative excursions; clamps to VC when voltage exceeds -VBR. |
| Cathode | Surge current entry (positive transient) | Accepts forward surge current during positive excursions; clamps to VC when voltage exceeds +VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (2 Ω source impedance) without degradation. |
| Halogen-free & RoHS-compliant (HM3) | Meets JEDEC J-STD-020 MSL level 1 and JESD201 class 2 whisker resistance; suitable for lead-free reflow. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio TVS devices in same power class. |
| AEC-Q101 qualification ready | Base HM3 suffix supports automotive-grade variants (e.g., SMBJ48CAHM3_X); qualified per stress test requirements for discrete semiconductors. |
Applications
| Industrial Power Supply Protection | Telecom Line Card Surge Suppression |
|---|---|
|
Use Scenario: Protecting 48 V DC input rails in programmable logic controller (PLC) power modules against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across input terminals upstream of DC/DC converters and LDOs. Use Value: Limits transient voltage to ≤77.4 V, preventing damage to 100 V-rated input capacitors and gate drivers while maintaining system uptime. |
Use Scenario: Safeguarding Ethernet PHY interface power pins (e.g., MDI-X) in carrier-grade access switches exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary board-level TVS on 48 V phantom power supply lines feeding PoE midspans. Use Value: Clamps 10/1000 µs surges to 77.4 V within nanoseconds, preserving PHY IC integrity without affecting 100BASE-TX signal integrity. |
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/Os in BCMs powered from 48 V mild-hybrid architectures. IC Role / Device Role / Timing Role: Secondary protection device on 48 V supply rail, coordinated with primary fuse and upstream TVS array. Use Value: Provides AEC-Q101-aligned transient immunity (with HM3 suffix) while fitting compact PCB space constraints of modular BCM designs. |
Use Scenario: Shielding analog front-end inputs of 4–20 mA current loop transmitters connected to field-mounted pressure/temperature sensors. IC Role / Device Role / Timing Role: Bidirectional clamp on sensor loop supply line, placed adjacent to connector to intercept incoming surges. Use Value: Maintains sub-1 µA leakage at 48 V, avoiding measurement drift; clamps fast ESD events (<1 ns) before reaching precision op-amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA-E3/52 | Same electrical specs, but RoHS-compliant commercial grade (E3) without halogen-free certification or AEC-Q101 qualification path. | Approved for general industrial use only; not recommended for automotive or high-reliability telecom deployments requiring halogen-free compliance. | Select SMBJ48CAHM3_A/I when halogen-free content, JESD201 class 2 whisker resistance, or AEC-Q101 traceability is required. |
| SAC48CA | Same VWM and VC, but 400 W PPPM rating and SMA package (smaller footprint, lower thermal mass). | Limited to lower-energy surge environments (e.g., IEC 61000-4-2 ESD only); unsuitable for IEC 61000-4-5 line surges due to reduced power handling. | Choose SMBJ48CAHM3_A/I where 600 W surge robustness and SMB mechanical stability are mandatory for field-deployed equipment. |
Compared with SMBJ48CA-E3/52 and SAC48CA, SMBJ48CAHM3_A/I delivers full 600 W surge immunity in a halogen-free, AEC-Q101-ready SMB package - making it the optimal choice for 48 V systems requiring long-term reliability, regulatory compliance, and high-energy transient suppression.
Availability
SMBJ48CAHM3_A/I is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, automotive body control modules, and sensor signal conditioning circuits requiring stable component supply with halogen-free and AEC-Q101-aligned sourcing.
Supply support for SMBJ48CAHM3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for board-level transient suppression in harsh electromagnetic environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where robust, standardized TVS performance is critical.
FAQ
What is the clamping voltage of SMBJ48CAHM3_A/I under a 10/1000 µs surge?
The SMBJ48CAHM3_A/I has a maximum clamping voltage (VC) of 77.4 V when subjected to its rated peak pulse current of 7.8 A using a 10/1000 µs waveform. This value is measured per Figure 1 and Table 1 in Vishay document 88392, ensuring predictable overvoltage limiting for downstream 100 V-rated components in 48 V systems.
Is SMBJ48CAHM3_A/I suitable for automotive applications?
Yes - the HM3 suffix indicates halogen-free, RoHS-compliant construction and alignment with AEC-Q101 qualification requirements. While the base SMBJ48CAHM3_A/I is commercial-grade, Vishay offers AEC-Q101-qualified versions (e.g., SMBJ48CAHM3_B/H) using the same die and package; SMBJ48CAHM3_A/I serves as the foundational variant for automotive-grade derivatives.
How does the bidirectional design of SMBJ48CAHM3_A/I affect circuit layout?
The SMBJ48CAHM3_A/I has no polarity marking and identical electrical behavior in both directions, eliminating orientation concerns during placement. This simplifies PCB layout for AC-coupled lines, differential buses, or floating supplies - unlike unidirectional TVS diodes, no cathode alignment or directional routing is required for SMBJ48CAHM3_A/I.
What is the thermal resistance of SMBJ48CAHM3_A/I, and how does it impact power dissipation?
SMBJ48CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W. At 25 °C ambient, its 5.0 W steady-state power rating allows continuous operation only at low leakage levels; its 600 W surge rating applies only to short-duration pulses (≤50 ms), not DC dissipation.
Does SMBJ48CAHM3_A/I meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes - SMBJ48CAHM3_A/I meets MSL level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. Its matte tin-plated leads comply with J-STD-002 and JESD22-B102 solderability standards, and the molding compound satisfies UL 94 V-0 flammability rating - supporting standard lead-free assembly processes without baking.
SMBJ48CAHM3_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):
- 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/I FAQ
1.How can I place an order for SMBJ48CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CAHM3_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 SMBJ48CAHM3_A/I reliable?
The price and inventory of SMBJ48CAHM3_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 SMBJ48CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ48CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CAHM3_A/I?
SMBJ48CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CAHM3_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 SMBJ48CAHM3_A/I?
For technical support, including SMBJ48CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ48CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ48CAHM3_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 SMBJ48CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ48CAHM3_A/I?
All SMBJ48CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CAHM3_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 SMBJ48CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ48CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48CAHM3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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