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Vishay General Semiconductor - Diodes Division SMBJ40AHE3_A/I
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- Part No.:
- SMBJ40AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40AHE3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,277
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Product details
Overview
SMBJ40AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 40 V standoff voltage (VWM), 44.4–49.1 V breakdown range at 1 mA, 64.5 V maximum clamping voltage at 9.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power supplies, industrial sensor interfaces, and DC-DC converter input stages.
For engineers reviewing the SMBJ40AHE3_A/I datasheet, SMBJ40AHE3_A/I pinout, SMBJ40AHE3_A/I application, or SMBJ40AHE3_A/I equivalent, this AEC-Q101 qualified TVS offers verified surge immunity per IEC 61000-4-5 (line-to-ground), low clamping ratio (VC/VBR ≈ 1.38), and MSL Level 1 moisture sensitivity - critical for high-reliability automotive ECUs and industrial PLC I/O modules.
Technical Context
This device operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response time and stable breakdown characteristics across -55 °C to +150 °C junction temperature. Its cathode-band polarity marking and DO-214AA (SMB) package enable automated placement while maintaining thermal resistance of 20 °C/W (junction-to-lead) and 100 °C/W (junction-to-ambient).
The SMBJ40AHE3_A/I delivers 100 A non-repetitive forward surge current capability (8.3 ms half-sine), supports ≤1.0 µA reverse leakage at 40 V, and exhibits a +0.101 %/°C temperature coefficient of VBR - enabling predictable clamping behavior under thermal stress in engine control units and motor drive gate driver circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected circuit DC rail. |
| VBR (Breakdown Voltage) | 44.4–49.1 V at 1 mA - Confirmed avalanche initiation range; ensures reliable triggering above normal operating voltage. |
| VC (Clamping Voltage) | 64.5 V at 9.3 A IPPM - Peak voltage seen by downstream IC during 10/1000 µs surge; defines worst-case stress on protected load. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capacity under standardized 10/1000 µs waveform; meets IEC 61000-4-5 Level 4 requirements. |
| ID (Reverse Leakage) | ≤1.0 µA at 40 V - Minimal standby power loss and signal integrity impact in high-impedance sensor bias networks. |
| TJ max. | +150 °C - Enables operation in under-hood automotive environments and enclosed industrial enclosures without derating. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards. |
Pinout & Package
Package: SMB (DO-214AA) - Surface-mount, low-profile case with matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability; meets UL 94 V-0 flammability rating and MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point for unidirectional clamping | Connected to protected line (e.g., 40 V supply rail); clamps positive transients to ground when voltage exceeds VBR. |
| Anode | Reference/ground return path | Must be tied to system ground or low-impedance return plane; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against severe lightning-induced surges (IEC 61000-4-5) without external series impedance. |
| AEC-Q101 qualification (HE3 suffix) | Validated for automotive powertrain and body electronics applications requiring zero-failure field reliability. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during fast transients - critical for safeguarding 48 V automotive microcontrollers and CAN transceivers. |
| MSL Level 1, 260 °C peak reflow | Eliminates pre-baking requirement and supports standard lead-free SMT assembly processes. |
| Glass-passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift in harsh industrial environments. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V/48 V battery rail in engine control unit exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping positive overvoltage spikes to protect LDO regulators and MCU power pins. Use Value: Withstands 100 A surge (8.3 ms) and clamps to 64.5 V - keeping downstream 5 V logic supplies within safe operating area. |
Use Scenario: 4–20 mA current loop interface in factory automation PLC analog input module. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across loop terminals to shunt induced EFT bursts from nearby motor switching. Use Value: 1.0 µA leakage at 40 V prevents loop current error; 64.5 V clamping avoids saturation of precision op-amp front-end. |
| DC-DC Converter Input Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Input stage of isolated 48 V → 5 V flyback converter in telecom base station power system. IC Role / Device Role / Timing Role: Primary-side TVS absorbing repetitive switching noise and accidental AC line cross-coupling events. Use Value: 600 W rating handles repeated 10/1000 µs surges; +0.101 %/°C VBR TC ensures stable clamping across -40 to +85 °C ambient. |
Use Scenario: TIP/RING line protection in VoIP gateway Ethernet port with integrated PoE. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to local ground, suppressing common-mode surges entering via RJ45 jack. Use Value: SMB package enables dense layout near connector; AEC-Q101 qualification adds margin for extended field life in outdoor cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40AHM3_A/I | Halogen-free variant with identical electrical specs and AEC-Q101 qualification; same SMB package and pinout. | No functional difference; selected where halogen-free compliance is mandated by OEM environmental policy. | Direct material substitution when RoHS + halogen-free certification required; no design or layout change needed. |
| SMCJ40AHE3_A/I | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package; 1500 W PPPM rating vs. 600 W. | Higher power handling suits higher-energy surge environments (e.g., outdoor telecom cabinets), but requires larger PCB footprint. | Choose when system-level surge test levels exceed 600 W - e.g., IEC 61000-4-5 Level 5 - and board space allows SMC footprint. |
Compared with SMBJ40AHE3_A/I, the HM3 variant offers identical protection performance with halogen-free construction, while the SMCJ40AHE3_A/I provides 2.5× higher surge power handling in a physically larger package - enabling tiered design flexibility for varying threat levels without changing circuit topology.
Availability
SMBJ40AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SMBJ40AHE3_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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The SMBJ series is engineered for high-speed transient suppression in space-constrained, high-reliability applications - emphasizing low clamping voltage, AEC-Q101 qualification, and compatibility with automated SMT assembly.
FAQ
What is the maximum clamping voltage of SMBJ40AHE3_A/I at its rated peak pulse current?
The SMBJ40AHE3_A/I has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current (IPPM), measured under the standardized 10/1000 µs waveform. This value defines the highest voltage imposed on protected circuitry during a surge event and is confirmed in Vishay's datasheet Document Number 88392, page 2. The SMBJ40AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is SMBJ40AHE3_A/I suitable for automotive applications?
Yes, SMBJ40AHE3_A/I is AEC-Q101 qualified, as indicated by the "HE3" suffix, and is explicitly rated for automotive use in engine control units, body electronics, and ADAS power domains. Its -55 °C to +150 °C operating junction temperature range, 100 A surge capability, and validation per JESD22 stress tests make it appropriate for under-hood and chassis-mounted systems where SMBJ40AHE3_A/I must withstand thermal cycling and vibration.
What does the "A/I" suffix mean in SMBJ40AHE3_A/I?
The "A/I" suffix in SMBJ40AHE3_A/I denotes packaging configuration: "A" indicates the base part number revision, and "I" specifies 13-inch diameter plastic tape-and-reel delivery containing 3200 units. This format aligns with Vishay's ordering code structure in Document Number 88392, page 3, and ensures compatibility with high-volume SMT pick-and-place equipment used in automotive and industrial manufacturing lines.
How does SMBJ40AHE3_A/I compare to bidirectional TVS diodes like SMBJ40CA?
SMBJ40AHE3_A/I is unidirectional and clamps only positive transients relative to ground, whereas SMBJ40CA is bidirectional and protects both polarities. The SMBJ40AHE3_A/I exhibits lower leakage (<1.0 µA at 40 V) and higher surge current capability in forward conduction mode, making it preferred for DC power rail protection. SMBJ40CA would be selected only for AC-coupled or floating signal lines where symmetric clamping is required - not for the typical use cases of SMBJ40AHE3_A/I.
What is the thermal resistance of SMBJ40AHE3_A/I, and how does it affect PCB layout?
SMBJ40AHE3_A/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 0.2" × 0.2" copper pads. To maintain safe operation under repetitive surges, PCB layout must provide adequate copper area on both anode and cathode pads per Vishay's recommended pad dimensions (page 5). Insufficient copper increases junction temperature and reduces surge endurance - a key design consideration for SMBJ40AHE3_A/I in high-duty-cycle industrial applications.
SMBJ40AHE3_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:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ40AHE3_A/I FAQ
1.How can I place an order for SMBJ40AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40AHE3_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 SMBJ40AHE3_A/I reliable?
The price and inventory of SMBJ40AHE3_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 SMBJ40AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ40AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40AHE3_A/I?
SMBJ40AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40AHE3_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 SMBJ40AHE3_A/I?
For technical support, including SMBJ40AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40AHE3_A/I requirements.
6.How does Aetrix verify that SMBJ40AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ40AHE3_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 SMBJ40AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ40AHE3_A/I?
All SMBJ40AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40AHE3_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 SMBJ40AHE3_A/I part is unused and in its original packaging.
Return procedure for SMBJ40AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40AHE3_A/I Tags
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Diodes Incorporated
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