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Vishay General Semiconductor - Diodes Division SMBJ40AHM3_B/I
- Part No.:
- SMBJ40AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40AHM3_B/I.pdf
- Description:
- 600W,40V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,118
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Product details
Overview
SMBJ40AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 64.5 V maximum clamping voltage (VC) at 9.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive ECUs, industrial I/O modules, and telecom power supplies.
For engineers reviewing the SMBJ40AHM3_B/I datasheet, SMBJ40AHM3_B/I pinout, SMBJ40AHM3_B/I application, or SMBJ40AHM3_B/I equivalent, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, halogen-free RoHS compliance, and real-world clamping performance data - all critical for ESD/surge protection design validation and BOM selection.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: under normal bias it presents <1.0 µA reverse leakage at 40 V; when exposed to transients exceeding VBR, it avalanches rapidly (<1 ns response) to clamp the line at ≤64.5 V while absorbing up to 600 W peak pulse power. Its 20 °C/W junction-to-lead thermal resistance enables effective heat dissipation during repetitive surge events on PCB copper pads.
The SMBJ40AHM3_B/I is halogen-free, RoHS-compliant, and AEC-Q101 qualified - confirming suitability for automotive-grade applications where reliability across -55 °C to +150 °C operating junction temperature is mandatory. Its matte tin-plated leads meet J-STD-002 solderability and JESD22-B102 whisker resistance Class 2 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before leakage exceeds 1.0 µA; defines safe DC rail margin for 48 V systems. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on above nominal rail. |
| VC @ IPPM | 64.5 V at 9.3 A - Clamped voltage during 10/1000 µs surge; protects downstream ICs rated ≤65 V absolute max. |
| PPPM | 600 W - Peak pulse power handling per JEDEC standard; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance; allows direct thermal path to PCB copper for sustained surge duty. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM/MM. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for lead-free reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point for unidirectional clamping | Connected to protected line; clamps positive transients to ground when anode is grounded. |
| Anode (non-banded end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes shunt path during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 surges up to 4 kV without cascaded stages. |
| ≤1 ns response time | Clamps transients before sensitive logic or analog circuitry sustains damage - critical for MCU I/O and sensor interfaces. |
| AEC-Q101 qualified & halogen-free | Meets automotive OEM requirements for long-term reliability and environmental compliance in engine control and ADAS modules. |
| Low incremental surge resistance | Minimizes VC overshoot during high-di/dt events - improves clamping precision for 48 V battery rail protection. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning risk. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 48 V supply input of BCM microcontroller and CAN transceivers from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VBAT and chassis ground, clamping transients within 1 ns. Use Value: Maintains VC ≤64.5 V during 120 V/50 ms load dump, preventing latch-up or gate oxide rupture in downstream 65 V-rated FETs and regulators. |
Use Scenario: Shields 24 V digital input optocoupler interface from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Standoff-rated TVS on input line, conducting only during >44.4 V transients while leaking <1 µA at steady state. Use Value: Enables >20 kV ESD contact immunity and 2 kV ring wave surge survival without degrading input threshold accuracy. |
| Telecom Power Supply Front-End | Automotive Camera Module Power Rail |
Use Scenario: Guards primary-side DC-DC converter input against lightning-induced surges on PoE or AC/DC adapter lines. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of fuse and filter inductors; absorbs energy before reaching bulk capacitors. Use Value: Withstands 600 W peak pulses without degradation, preserving MTBF in outdoor base station power units. |
Use Scenario: Secures 5 V or 12 V camera module power rail against ESD and cable discharge events in rear-view or surround-view systems. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS mounted adjacent to image sensor power pins. Use Value: Delivers <10 pF junction capacitance (per Fig. 4) - avoids signal integrity impact on high-speed MIPI CSI-2 clock/data lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40AHE3_B/I | Same electrical specs and SMB package, but RoHS-compliant commercial grade (not AEC-Q101 qualified); no halogen-free certification. | Approved for industrial/commercial use only; not permitted in automotive production without additional qualification. | Select SMBJ40AHE3_B/I for cost-sensitive non-automotive designs where AEC-Q101 is unnecessary. |
| SMAJ40A-M3/A | Lower 400 W PPPM; SMA (DO-214AC) package with smaller footprint (4.32 mm × 2.62 mm) and higher RθJA (140 °C/W). | Acceptable for lower-energy transients (IEC 61000-4-2 ESD only); unsuitable for IEC 61000-4-5 surge due to reduced power rating. | Choose SMAJ40A-M3/A only when board space is constrained and surge threat level is limited to ESD or low-dose switching noise. |
Compared with SMBJ40AHE3_B/I, the SMBJ40AHM3_B/I adds AEC-Q101 qualification and halogen-free compliance - essential for automotive Tier 1 sourcing - while SMAJ40A-M3/A trades 33 % lower surge capacity and inferior thermal performance for smaller size, limiting its use to less demanding protection roles.
Availability
SMBJ40AHM3_B/I is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply, long-term lifecycle support, and certified surge immunity.
Supply support for SMBJ40AHM3_B/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, power efficiency, and automotive-grade qualification.
The SMBJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising signal integrity or thermal stability.
FAQ
What is the maximum clamping voltage of SMBJ40AHM3_B/I under a 10/1000 µs surge?
The SMBJ40AHM3_B/I has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and ensures downstream components with ≤65 V absolute maximum ratings remain protected during surge events. The SMBJ40AHM3_B/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), with minimal derating required up to 125 °C.
Is SMBJ40AHM3_B/I suitable for automotive applications?
Yes, SMBJ40AHM3_B/I is AEC-Q101 qualified and explicitly designated for automotive use - confirmed by Vishay's ordering code suffix "HM3_B/I", where "H" indicates AEC-Q101 qualification and "M3" denotes halogen-free RoHS compliance. It meets stress tests including high-temperature operating life (HTOL), temperature cycling (TCT), and human-body-model ESD (HBM ≥8 kV). The SMBJ40AHM3_B/I is deployed in body control modules, ADAS camera power rails, and infotainment system interfaces where sustained reliability under thermal and electrical stress is mandatory.
How does SMBJ40AHM3_B/I differ from SMBJ40AHE3_B/I?
The SMBJ40AHM3_B/I and SMBJ40AHE3_B/I share identical electrical parameters (VWM = 40 V, VBR = 44.4–49.1 V, VC = 64.5 V) and SMB package dimensions, but differ in qualification and material compliance: SMBJ40AHM3_B/I is both AEC-Q101 qualified and halogen-free, whereas SMBJ40AHE3_B/I is RoHS-compliant commercial grade without automotive qualification. This makes SMBJ40AHM3_B/I mandatory for Tier 1 automotive BOMs, while SMBJ40AHE3_B/I suffices for industrial or consumer applications where AEC-Q101 is not required.
What is the thermal resistance profile of SMBJ40AHM3_B/I?
The SMBJ40AHM3_B/I has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient (RθJA) of 100 °C/W when mounted on 5.0 mm × 5.0 mm copper pads. This low RθJL enables efficient heat transfer from the silicon die directly into the PCB copper, supporting repetitive surge operation without thermal runaway. Derating curves in Figure 2 show that at 100 °C ambient, the device retains ~70 % of its 600 W peak pulse rating - a key advantage over higher-RθJA alternatives like SMAJ-series devices.
Does SMBJ40AHM3_B/I support lead-free reflow assembly?
Yes, SMBJ40AHM3_B/I is qualified for lead-free reflow soldering with a maximum peak temperature of 260 °C (MSL Level 1 per J-STD-020), and its matte tin-plated terminals comply with J-STD-002 and JESD22-B102 for solderability and whisker resistance (Class 2). No moisture sensitivity preconditioning is required prior to assembly, eliminating process steps and reducing risk of popcorning during reflow - a critical benefit for high-volume automotive and industrial manufacturing lines using SMBJ40AHM3_B/I.
SMBJ40AHM3_B/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 9.3A
- 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)
SMBJ40AHM3_B/I FAQ
1.How can I place an order for SMBJ40AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40AHM3_B/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 SMBJ40AHM3_B/I reliable?
The price and inventory of SMBJ40AHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40AHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ40AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40AHM3_B/I?
SMBJ40AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40AHM3_B/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 SMBJ40AHM3_B/I?
For technical support, including SMBJ40AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ40AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ40AHM3_B/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 SMBJ40AHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ40AHM3_B/I?
All SMBJ40AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40AHM3_B/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 SMBJ40AHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ40AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40AHM3_B/I Tags
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