My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ48CAHM3_B/H
- Part No.:
- SMBJ48CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CAHM3_B/H.pdf
- Description:
- 600W,48V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,553
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ48CAHM3_B/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 power and signal lines. It features a 48 V stand-off 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ48CAHM3_B/H datasheet, SMBJ48CAHM3_B/H pinout, SMBJ48CAHM3_B/H application, or SMBJ48CAHM3_B/H equivalent, this part delivers verified bidirectional surge suppression with halogen-free RoHS compliance, AEC-Q101 qualification, and MSL Level 1 moisture sensitivity - critical for automotive ECUs, telecom line cards, and ruggedized embedded systems requiring repeatable transient immunity.
Technical Context
This device operates as a voltage-clamping protector: under normal conditions it presents high impedance (>1 µA leakage at 48 V), then rapidly avalanches below 77.4 V to shunt transient energy away from downstream circuitry. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance across temperature.
Designed for unidirectional or bidirectional configurations, SMBJ48CAHM3_B/H supports symmetric clamping in both polarities - essential for AC-coupled lines, differential buses, and floating sensor inputs where polarity reversal may occur during ESD or lightning-induced surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe working margin for 48 V nominal systems. |
| VBR min/max | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown range ensures reliable turn-on within spec across production lot and temperature. |
| VC @ IPPM | 77.4 V at 7.8 A - Clamping voltage limits stress on protected ICs during 10/1000 µs transients; enables robust 48 V rail protection. |
| PPPM | 600 W - Peak pulse power handling capability with 0.01% duty cycle; sufficient for IEC 61000-4-5 Level 4 surges. |
| TJ max | +150 °C - Maximum junction temperature allows operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
| Compliance | AEC-Q101 qualified, halogen-free, RoHS-compliant - meets automotive reliability and environmental requirements without derating. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration - no polarity marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of bidirectional junction; conducts when voltage falls below -VBR, enabling dual-quadrant clamping. |
| Cathode | Transient current entry (positive polarity) | Other terminal of bidirectional junction; conducts when voltage exceeds +VBR; functionally identical to Anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential pairs, or floating rails without external polarity management. |
| 600 W peak pulse power | Handles IEC 61000-4-5 combination wave surges up to 4 kV/2 Ω without degradation under defined test conditions. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow soldering without preconditioning; eliminates moisture-related popcorning risk during assembly. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to protected components - critical for 48 V logic-level interfaces and gate drivers. |
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensor modules per stress test requirements. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed at input filter stage to clamp ±100 V spikes before DC/DC converter input. Use Value: Prevents latch-up or permanent damage to buck controller ICs by limiting transient voltage to ≤77.4 V during 600 W surges. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Placed across sensor output and ground to suppress ESD and inductive kickback from nearby solenoid switching. Use Value: Maintains signal integrity by clamping transients within 1 ns response time while adding <1 pF junction capacitance at zero bias. |
| Telecom Line Card Surge Protection | Renewable Energy Inverter Control Board |
|
Use Scenario: Safeguarding RS-485 transceivers and Ethernet PHYs on outdoor base station backhaul cards. IC Role / Device Role / Timing Role: Mounted directly at connector interface to divert lightning-induced common-mode surges before signal conditioning circuitry. Use Value: Withstands repeated 10/1000 µs surges up to 7.8 A without parameter shift - validated per Telcordia GR-1089-CORE. |
Use Scenario: Protecting microcontroller GPIOs and isolated gate drivers in solar string inverters exposed to grid-switching transients. IC Role / Device Role / Timing Role: Used on auxiliary 48 V bias rails feeding optocouplers and level-shifters in high-voltage isolation domains. Use Value: Halogen-free, AEC-Q101-rated construction ensures long-term reliability in thermally cycled outdoor enclosures up to +105 °C ambient. |
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_B/H | Same electrical specs, RoHS-compliant but not halogen-free; uses standard tin plating instead of matte tin. | Lacks halogen-free certification; acceptable for commercial-grade industrial use but not automotive or green procurement mandates. | Select SMBJ48CAHE3_B/H only if halogen-free compliance is not required and cost optimization is prioritized. |
| SMAJ48CAHM3 | Lower 400 W PPPM, same VWM/VC; SMA package (smaller footprint, lower thermal mass). | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy transients in space-constrained consumer designs. | Choose SMAJ48CAHM3 only when board area is critical and surge threat level is ≤Level 3 per IEC standards. |
Compared with SMBJ48CAHE3_B/H and SMAJ48CAHM3, SMBJ48CAHM3_B/H uniquely combines 600 W surge capacity, halogen-free materials, and AEC-Q101 qualification - making it the only option among the three qualified for automotive 48 V subsystems requiring full environmental and reliability compliance.
Availability
SMBJ48CAHM3_B/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and telecom line card development requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ48CAHM3_B/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, and protection devices with emphasis on reliability and application-specific performance.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom markets where consistent clamping behavior and AEC-Q101 validation are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ48CAHM3_B/H under a 10/1000 µs surge?
The SMBJ48CAHM3_B/H has a maximum clamping voltage (VC) of 77.4 V at 7.8 A peak pulse current with a 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees that protected downstream components experience no more than 77.4 V during standardized surge events - critical for safeguarding 48 V-rated ICs and MOSFETs. The SMBJ48CAHM3_B/H maintains this clamping performance across its full operating temperature range.
Is SMBJ48CAHM3_B/H suitable for automotive applications?
Yes, SMBJ48CAHM3_B/H is AEC-Q101 qualified and halogen-free, meeting automotive reliability and environmental requirements for under-hood and chassis-mounted electronics. Its 150 °C maximum junction temperature, MSL Level 1 rating, and validated surge performance make it appropriate for 48 V battery systems, ADAS sensor modules, and body control units. The SMBJ48CAHM3_B/H is explicitly listed in Vishay's AEC-Q101 qualified product matrix with full test report traceability.
How does the bidirectional configuration of SMBJ48CAHM3_B/H affect PCB layout?
The SMBJ48CAHM3_B/H has no polarity marking and symmetrical terminals, simplifying PCB layout by eliminating orientation constraints during placement. Unlike unidirectional TVS diodes, it protects both positive and negative transients without requiring external diode pairing or careful anode/cathode alignment. This reduces design complexity and assembly error risk - especially beneficial in differential signaling paths or AC-coupled interfaces where voltage polarity reverses dynamically. The SMBJ48CAHM3_B/H functions identically regardless of mounting direction.
What is the thermal resistance of SMBJ48CAHM3_B/H, and how does it impact power dissipation?
The SMBJ48CAHM3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended copper pads (0.2" × 0.2"). This means a 5.0 W steady-state power dissipation would raise the junction temperature by 500 °C above ambient - confirming that the device is intended for transient-only operation, not continuous conduction. Its 600 W peak pulse rating applies only to short-duration events (≤50 ms), and sustained power must remain well below 5.0 W to avoid exceeding the +150 °C TJ limit. The SMBJ48CAHM3_B/H relies on thermal inertia, not heatsinking, for surge handling.
Does SMBJ48CAHM3_B/H meet UL recognition requirements?
Yes, SMBJ48CAHM3_B/H carries Underwriters Laboratories recognition under UL 497B (QVGQ2) for protector classification, with file number E136766 covering both unidirectional and bidirectional variants. This certification validates its suitability for use in safety-critical surge protection circuits in North American equipment, including industrial controls and telecom infrastructure. The UL listing applies specifically to the SMBJ48CAHM3_B/H construction - including its DO-214AA package, glass-passivated junction, and matte tin-plated leads - and is documented in Vishay's official UL directory entry.
SMBJ48CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- 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_B/H FAQ
1.How can I place an order for SMBJ48CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CAHM3_B/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_B/H reliable?
The price and inventory of SMBJ48CAHM3_B/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_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ48CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CAHM3_B/H?
SMBJ48CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CAHM3_B/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_B/H?
For technical support, including SMBJ48CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ48CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ48CAHM3_B/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_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ48CAHM3_B/H?
All SMBJ48CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CAHM3_B/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_B/H part is unused and in its original packaging.
Return procedure for SMBJ48CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48CAHM3_B/H Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
