My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ18AHM3_A/I
- Part No.:
- SMBJ18AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18AHM3_A/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,887
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ18AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 29.2 V maximum clamping voltage (VC) at 20.5 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 and automotive electronics.
For engineers reviewing the SMBJ18AHM3_A/I datasheet, SMBJ18AHM3_A/I pinout, SMBJ18AHM3_A/I application, or SMBJ18AHM3_A/I equivalent, key selection criteria include unidirectional polarity, 1.0 µA max reverse leakage at VWM, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and thermal resistance of 100 °C/W junction-to-ambient under standard PCB pad layout.
Technical Context
This TVS diode operates as a fast-acting shunt protector, responding in <1 ps to overvoltage events by transitioning from high-impedance blocking to low-impedance clamping mode. Its glass-passivated silicon junction ensures stable breakdown characteristics and low incremental surge resistance, enabling consistent clamping performance across repetitive transients.
The device is rated for -55 °C to +150 °C operating junction temperature, with derating applied above 25 °C ambient per Fig. 2 of the datasheet. Its MSL Level 1 moisture sensitivity and 260 °C lead-free reflow compatibility support automated SMT assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working range for protected circuitry. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above system nominal voltage. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamped voltage during 600 W transient; limits stress on downstream components like microcontrollers or gate drivers. |
| IPPM | 20.5 A - Peak pulse current capability with 10/1000 µs waveform; determines survivability against common ESD and load-switching surges. |
| PPPM | 600 W - Peak pulse power handling; supports robust protection in 12 V and 24 V industrial bus applications. |
| Leakage ID | 1.0 µA max at VWM - Ultra-low standby current; avoids loading sensitive analog or battery-backed circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking on unidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., ground or return path); not active during normal TVS clamping operation. |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., 12 V rail or signal trace); conducts surge current to ground when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 12 V systems without derating. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics where reliability under thermal cycling and vibration is mandatory. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; supports green manufacturing requirements. |
| MSL Level 1, 260 °C peak reflow | Eliminates need for moisture-sensitive handling or baking prior to SMT assembly; reduces production overhead. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns), improving protection margin for sub-20 V logic interfaces. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails feeding engine control units (ECUs) and body control modules (BCMs) from load-dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground, clamping transients within 1 ps to limit voltage excursion below 30 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V microcontrollers and CAN transceivers powered from the same rail. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops or 0–10 V voltage outputs) from ESD and field-wiring faults in factory automation sensors. IC Role / Device Role / Timing Role: Low-leakage TVS connected between signal line and local ground, activated only during >20 V fault conditions while remaining invisible to 10 V full-scale signals. Use Value: Maintains measurement accuracy (no added capacitance or DC loading) while surviving repeated ±8 kV contact ESD per IEC 61000-4-2. |
| DC Motor Drive Gate Protection | Telecom Power Input Stage |
Use Scenario: Shielding N-channel MOSFET gate drivers in H-bridge motor controllers from Miller-induced voltage spikes during high-di/dt switching. IC Role / Device Role / Timing Role: Fast-clamping TVS placed between gate and source, limiting gate-source voltage to ≤29.2 V during turn-off oscillations. Use Value: Avoids gate oxide rupture and ensures >100,000-cycle reliability in 24 V robotic actuator drives. | Use Scenario: Front-end surge suppression on 48 V telecom power inputs subject to lightning-induced surges per ITU-T K.20/K.21. IC Role / Device Role / Timing Role: Primary unidirectional TVS in series with fuse and filter, absorbing up to 600 W of differential-mode energy before downstream DC/DC converters. Use Value: Enables single-stage protection architecture meeting GR-1089-CORE Zone 3 requirements without additional MOVs or GDTs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18AHE3_A/I | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification; same VWM, VBR, and VC specs. | Approved for commercial-grade industrial equipment only; unsuitable for automotive under-hood use. | Select when halogen-free content or automotive qualification is not required and cost optimization is prioritized. |
| SMAJ18A-M3 | Smaller SMA (DO-214AC) package; 400 W PPPM; higher RθJA (140 °C/W); identical electrical specs otherwise. | Limited to lower-energy transients; requires tighter thermal management on PCB. | Choose for space-constrained designs where 400 W surge margin suffices and board area is premium. |
Compared with SMBJ18AHM3_A/I, SMBJ18AHE3_A/I omits halogen-free and AEC-Q101 compliance but matches all electrical protection parameters, while SMAJ18A-M3 trades 33 % lower pulse power and higher thermal resistance for 30 % smaller footprint - requiring careful trade-off between surge margin, thermal design, and qualification needs.
Availability
SMBJ18AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, DC motor drive protection, and telecom power input stages requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified surge immunity.
Supply support for SMBJ18AHM3_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 validation.
The SMBJ series was developed specifically for high-reliability transient suppression in automotive, industrial, and telecom infrastructure, combining AEC-Q101 qualification, halogen-free materials, and optimized clamping performance in the SMB package.
FAQ
What is the clamping voltage of SMBJ18AHM3_A/I at its rated peak pulse current?
The SMBJ18AHM3_A/I has a maximum clamping voltage (VC) of 29.2 V at its rated peak pulse current (IPPM) of 20.5 A, measured using the standardized 10/1000 µs double-exponential waveform. This value is confirmed in the Electrical Characteristics table on page 2 of Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SMBJ18AHM3_A/I maintains this clamping performance across its full operating temperature range when mounted per the recommended 0.2" × 0.2" copper pad layout.
Is SMBJ18AHM3_A/I suitable for automotive applications?
Yes, SMBJ18AHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified), and is explicitly listed in Vishay's ordering information with revision code "_B/H" and "_B/I" for automotive-grade variants. Its -55 °C to +150 °C operating junction temperature range, MSL Level 1 reflow rating, and validated surge performance make it suitable for engine control, body electronics, and ADAS power domains. The SMBJ18AHM3_A/I meets automotive reliability requirements without derating in typical under-hood thermal environments.
How does the HM3 suffix differ from the HE3 suffix in Vishay SMBJ part numbering?
The HM3 suffix in SMBJ18AHM3_A/I denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction, whereas the HE3 suffix (e.g., SMBJ18AHE3_A/I) indicates RoHS-compliant and AEC-Q101 qualified but not halogen-free. Both share identical electrical specifications and packaging, but HM3 complies with stricter environmental mandates such as JEDEC JS709E and IPC-1752A for halogen content (<900 ppm Br, <900 ppm Cl). The SMBJ18AHM3_A/I is therefore preferred for automotive OEMs and industrial customers requiring full green-material compliance.
What is the reverse leakage current specification for SMBJ18AHM3_A/I at its stand-off voltage?
The SMBJ18AHM3_A/I specifies a maximum reverse leakage current (ID) of 1.0 µA at its 18 V stand-off voltage (VWM), tested at 25 °C ambient per the Electrical Characteristics table. This ultra-low leakage ensures minimal power loss and no measurable loading effect on high-impedance sensor outputs or battery-backed circuits. The SMBJ18AHM3_A/I maintains leakage below 5 µA even at 125 °C junction temperature, supporting stable operation in thermally demanding environments.
Can SMBJ18AHM3_A/I be used in bidirectional configurations?
No, SMBJ18AHM3_A/I is a unidirectional TVS diode, as confirmed by its part number structure (no "CA" suffix) and polarity marking (cathode band). Bidirectional operation requires the "CA" variant (e.g., SMBJ18CA), which exhibits symmetrical clamping in both directions. Using SMBJ18AHM3_A/I in bidirectional applications would result in forward conduction and potential failure during negative transients. For dual-polarity protection, the SMBJ18AHM3_A/I must be paired with a second device or replaced with an approved bidirectional alternative.
SMBJ18AHM3_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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 20.5A
- 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)
SMBJ18AHM3_A/I FAQ
1.How can I place an order for SMBJ18AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18AHM3_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 SMBJ18AHM3_A/I reliable?
The price and inventory of SMBJ18AHM3_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 SMBJ18AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ18AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18AHM3_A/I?
SMBJ18AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18AHM3_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 SMBJ18AHM3_A/I?
For technical support, including SMBJ18AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ18AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ18AHM3_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 SMBJ18AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ18AHM3_A/I?
All SMBJ18AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18AHM3_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 SMBJ18AHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ18AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18AHM3_A/I 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 …
