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Vishay General Semiconductor - Diodes Division SMBJ7.5A-M3/5B
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- Part No.:
- SMBJ7.5A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ7.5A-M3/5B.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,348
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Product details
Overview
SMBJ7.5A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1.0 mA, 12.9 V maximum clamping voltage (VC) at 46.5 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive body control modules to safeguard CAN transceivers against load-dump and inductive switching transients.
For engineers reviewing the SMBJ7.5A-M3/5B datasheet, SMBJ7.5A-M3/5B pinout, SMBJ7.5A-M3/5B application, or SMBJ7.5A-M3/5B equivalent, key selection criteria include clamping performance under 46.5 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity with cathode band marking, and halogen-free RoHS-compliant construction per M3 suffix - all critical for industrial power supply input stage protection and AEC-Q101-qualified designs.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (8.33–9.21 V), it avalanches to divert transient energy away from downstream ICs. Its low incremental surge resistance ensures minimal voltage overshoot during fast 10/1000 μs surges, while the glass-passivated junction enables stable, repeatable clamping across temperature (−55 °C to +150 °C).
The SMBJ7.5A-M3/5B uses a unidirectional configuration with defined cathode polarity, requiring correct orientation in series with protected lines. Its DO-214AA (SMB) package supports automated placement and meets J-STD-020 MSL Level 1, with matte tin-plated leads compliant to J-STD-002 solderability and JESD 22-B102 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - maximum continuous reverse operating voltage before leakage rises; sets upper limit for normal DC rail operation. |
| VBR (min/max) | 8.33 V / 9.21 V at 1.0 mA - guaranteed avalanche initiation range; defines minimum overvoltage threshold for clamping activation. |
| VC @ IPPM | 12.9 V at 46.5 A - clamped voltage during full 600 W transient; determines maximum stress imposed on protected IC inputs. |
| PPPM | 600 W - peak pulse power handling with 10/1000 μs waveform; validates robustness against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | 100 μA - maximum reverse leakage at 7.5 V; ensures negligible standby power loss in battery-powered systems. |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood automotive environments without derating. |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on standard PCB pads; informs heatsinking requirements for repetitive surge duty. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant (M3 suffix), with cathode indicated by a band on the case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential side of protected circuit. | Must be tied to ground or return path when protecting positive rail; polarity reversal prevents clamping function. |
| Cathode | Current exit terminal in forward bias; marked by band; reverse-biased during surge suppression. | Connected to protected line (e.g., 12 V rail); conducts avalanche current to ground during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables single-device protection against severe transients like ISO 7637-2 Pulse 5a (load dump), eliminating need for cascaded protection stages. |
| 12.9 V clamping voltage at 46.5 A | Keeps protected ICs (e.g., microcontrollers, CAN transceivers) below absolute maximum ratings during worst-case surge conditions. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance mandates for automotive and industrial OEMs without compromising surge robustness. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without moisture sensitivity concerns or pre-bake requirements. |
| Low incremental surge resistance | Minimizes voltage overshoot during sub-microsecond rise-time transients (<1 ns), improving protection fidelity for high-speed interfaces. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load-dump transients (up to 35 V, 400 ms) and inductive switch-off spikes in vehicle body control units. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground, clamping within nanoseconds of overvoltage onset. Use Value: Limits rail voltage to ≤12.9 V during 46.5 A surge, preventing latch-up or permanent damage to 16-bit MCUs and LIN transceivers. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC I/O modules exposed to relay-coil kickback and ESD. IC Role / Device Role / Timing Role: Low-leakage (100 μA) TVS mounted directly at connector entry point, suppressing ±1 kV EFT bursts per IEC 61000-4-4. Use Value: Maintains signal integrity below 10 mV offset shift during transients due to tight 7.5 V stand-off and rapid response (<1.0 ns). |
| DC Power Supply Input Stage | USB/Serial Communication Line Protection |
|
Use Scenario: Front-end overvoltage clamp in 24 V industrial SMPS inputs subjected to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary TVS in coordination with MOVs and fuses; absorbs first 600 W surge energy before secondary protection engages. Use Value: Withstands 100 A non-repetitive surge (IFSM) and dissipates 5.0 W continuously, enabling reliable operation without thermal runaway. |
Use Scenario: Bidirectional-capable protection (via SMBJ7.5CA variant) on RS-485/UART lines in smart metering gateways exposed to field wiring faults. IC Role / Device Role / Timing Role: Though SMBJ7.5A-M3/5B is unidirectional, its low capacitance (<100 pF at 0 V) allows placement on low-speed serial lines without signal degradation. Use Value: Prevents false triggering in UART bootloaders by limiting leakage to 100 μA at 7.5 V, ensuring stable logic-level recognition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ7.5A-E3/5B | Same electrical specs and SMB package, but RoHS-compliant with lead-free (Pb-free) plating only - no halogen-free requirement. | Approved for commercial-grade industrial equipment where halogen content is unrestricted. | Select when cost-sensitive commercial designs require RoHS compliance without halogen-free certification. |
| SMBJ7.5CA-M3/5B | Bidirectional version: symmetric VBR (8.33–9.21 V) in both polarities; same VC (12.9 V), IPPM (46.5 A), and PPPM (600 W). | Required for AC-coupled or dual-rail signal lines (e.g., RS-232, audio) where polarity reversal occurs. | Choose when protecting differential or alternating-voltage paths where unidirectional blocking would fail. |
Compared with SMBJ7.5A-E3/5B, the M3 suffix adds halogen-free assurance for automotive Tier 1 compliance; compared with SMBJ7.5CA-M3/5B, the unidirectional configuration provides tighter leakage control (100 μA vs. 200 μA for bidirectional) and avoids unnecessary conduction during negative excursions in DC systems.
Availability
SMBJ7.5A-M3/5B is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and sensor interface circuits requiring stable component supply with halogen-free, AEC-Q101-aligned manufacturing traceability.
Supply support for SMBJ7.5A-M3/5B 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive qualification.
The SMBJ series is engineered for rugged transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without adding complexity or board space.
FAQ
What is the maximum clamping voltage of SMBJ7.5A-M3/5B under rated surge conditions?
The SMBJ7.5A-M3/5B has a maximum clamping voltage (VC) of 12.9 V when subjected to its rated peak pulse current of 46.5 A using the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees that protected circuitry will not experience voltages exceeding 12.9 V during such transient events - a critical parameter for ensuring compatibility with 12 V logic and automotive ICs' absolute maximum ratings. The SMBJ7.5A-M3/5B achieves this while maintaining low thermal resistance and repeatable performance across temperature.
Is SMBJ7.5A-M3/5B suitable for automotive applications requiring AEC-Q101 qualification?
No - SMBJ7.5A-M3/5B is halogen-free and RoHS-compliant (M3 suffix) but not AEC-Q101 qualified. For automotive-grade qualification, the equivalent part is SMBJ7.5A-HM3_B/I (or HM3_B/H), which carries the HM3 suffix denoting halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. The SMBJ7.5A-M3/5B is intended for commercial and industrial applications where AEC-Q101 is not mandated, though its thermal and surge performance aligns closely with automotive requirements.
How does the M3 suffix differ from the E3 suffix in SMBJ7.5A-M3/5B?
The M3 suffix indicates halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance, whereas E3 denotes RoHS-compliant construction without halogen-free assurance. Both share identical electrical characteristics, SMB package dimensions, and thermal performance. The SMBJ7.5A-M3/5B is selected when regulatory or customer requirements mandate halogen-free materials - common in EU automotive supply chains and green electronics initiatives - while SMBJ7.5A-E3/5B serves general-purpose commercial applications.
What is the reverse leakage current of SMBJ7.5A-M3/5B at its stand-off voltage?
The SMBJ7.5A-M3/5B exhibits a maximum reverse leakage current (ID) of 100 μA at its rated stand-off voltage (VWM) of 7.5 V and ambient temperature of 25 °C. This low leakage ensures minimal power loss in always-on systems such as automotive body controllers or IoT sensor nodes, preserving battery life and avoiding false triggers in high-impedance monitoring circuits. The SMBJ7.5A-M3/5B maintains this specification across its full operating temperature range (−55 °C to +150 °C), with leakage increasing predictably per datasheet curves.
Can SMBJ7.5A-M3/5B be used in bidirectional signal line protection?
No - SMBJ7.5A-M3/5B is a unidirectional TVS diode, meaning it only clamps in reverse bias and conducts forward current above ~3.5 V (VF). For bidirectional protection (e.g., RS-485, AC-coupled sensors), the SMBJ7.5CA-M3/5B variant must be used, which provides symmetrical clamping in both polarities. Using SMBJ7.5A-M3/5B on bidirectional lines risks forward conduction during negative half-cycles, potentially disrupting signal integrity or damaging upstream drivers. The SMBJ7.5A-M3/5B is strictly intended for DC rail or unidirectional signal protection.
SMBJ7.5A-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 46.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ7.5A-M3/5B FAQ
1.How can I place an order for SMBJ7.5A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ7.5A-M3/5B 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 SMBJ7.5A-M3/5B reliable?
The price and inventory of SMBJ7.5A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ7.5A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ7.5A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ7.5A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ7.5A-M3/5B?
SMBJ7.5A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ7.5A-M3/5B 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 SMBJ7.5A-M3/5B?
For technical support, including SMBJ7.5A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ7.5A-M3/5B requirements.
6.How does Aetrix verify that SMBJ7.5A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ7.5A-M3/5B 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 SMBJ7.5A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ7.5A-M3/5B?
All SMBJ7.5A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ7.5A-M3/5B, 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 SMBJ7.5A-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ7.5A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ7.5A-M3/5B Tags
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