My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ18CAHM3_B/H
- Part No.:
- SMBJ18CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CAHM3_B/H.pdf
- Description:
- 600W,18V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,284
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ18CAHM3_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 signal or power lines. It features 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤29.2 V at 20.5 A peak surge current - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ18CAHM3_B/H datasheet, SMBJ18CAHM3_B/H pinout, SMBJ18CAHM3_B/H application, or SMBJ18CAHM3_B/H equivalent, this device is selected for robust ESD and lightning surge immunity in bidirectional AC-coupled or floating signal paths where low clamping voltage and fast response (<1 ns) are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (20.0–22.1 V), ID ≤1.0 µA at VWM = 18 V, and TC of VBR = 0.092 %/°C. Its junction capacitance is not specified for SMBJ18CAHM3_B/H but falls within the family's typical range of <100 pF at 0 V bias (measured at 1 MHz).
Thermal resistance is RθJA = 100 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 20 °C/W; maximum junction temperature is +150 °C. The device meets MSL Level 1 per J-STD-020, with lead finish matte tin and LF peak reflow at 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - guaranteed breakdown onset window; ensures predictable turn-on during overvoltage events |
| VC @ IPPM | 29.2 V at 20.5 A - clamped voltage under 10/1000 µs surge; determines protected circuit's maximum transient exposure |
| PPPM | 600 W - peak pulse power handling capability; enables survival of high-energy transients like IEC 61000-4-5 surges |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage at rated stand-off; minimizes standby power loss and signal distortion |
| TJ max. | +150 °C - maximum junction temperature; supports operation in harsh industrial or under-hood environments |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity event) | Accepts surge current during negative-going transients; connects to protected line or ground return path |
| Cathode | Transient current entry (positive polarity event) | Accepts surge current during positive-going transients; forms symmetrical conduction path with anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled, differential, or floating signal lines without polarity constraints |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy surges such as IEC 61000-4-5 Level 3 (1 kV/2 Ω) without degradation |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping - critical for safeguarding 3.3 V or 5 V logic interfaces |
| Halogen-free, RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for industrial and automotive end equipment |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - reduces manufacturing overhead |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting RS-485 transceivers and analog sensor outputs (e.g., 4–20 mA loops) from inductive switching noise and EFT bursts. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential pair or between signal line and ground. Use Value: Limits transient excursions to ≤29.2 V, preserving integrity of ±12 V common-mode range and preventing latch-up in transceivers. |
Use Scenario: Shielding Ethernet PHY front-end and DSL line drivers from lightning-induced surges and AC power cross-talk. IC Role / Device Role / Timing Role: Primary-level TVS mounted at connector interface, upstream of gas discharge tube or secondary filter. Use Value: Responds in <1 ns to divert >20 A surges while maintaining sub-1 µA leakage at 18 V - avoids false triggering or DC loading. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
|
Use Scenario: Safeguarding LIN bus nodes and switch inputs in BCMs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional suppressor on LIN data line and VBAT-sensed inputs. Use Value: AEC-Q101 qualified variant available (HM3_X); clamps 10/1000 µs surges to 29.2 V without derating up to +125 °C ambient. |
Use Scenario: Protecting microcontroller GPIOs and optocoupler inputs driving relays or triacs in washing machine control boards. IC Role / Device Role / Timing Role: Localized TVS on isolated control signals subject to back-EMF from brushed motors. Use Value: 600 W rating handles repetitive 8.3 ms half-sine surges (IFSM = 100 A); halogen-free HM3 construction satisfies appliance safety standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA-E3/52 | RoHS-compliant commercial grade (E3), non-halogen-free; same VWM/VBR/PPPM specs; MSL Level 1, 260 °C reflow | Lacks halogen-free certification; suitable for non-regulated commercial designs where material compliance is not mandated | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 qualification is unnecessary |
| SMBJ18CAHM3_B/I | Identical electrical and thermal specs; differs only in packaging - 3200-unit 13" tape-and-reel vs. 750-unit 7" reel (B/H) | No functional difference; choice driven by production volume, SMT line feed compatibility, and inventory planning | Choose B/I for high-volume automated assembly requiring extended reel length and reduced changeover frequency |
Compared with SMBJ18CAHM3_B/H, the E3 variant trades halogen-free status for lower unit cost in non-automotive applications, while the HM3_B/I offers identical performance in larger reels - enabling optimization of procurement scale versus line-side logistics.
Availability
SMBJ18CAHM3_B/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and automotive body control modules requiring stable component supply with halogen-free and RoHS-compliant assurance.
Supply support for SMBJ18CAHM3_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, MOSFETs, and protection devices with emphasis on reliability and application-specific performance.
The SMBJ series targets board-level transient suppression in space-constrained, high-reliability systems - engineered for rapid response, low clamping, and compatibility with modern SMT assembly processes.
FAQ
What is the standoff voltage rating of SMBJ18CAHM3_B/H?
The SMBJ18CAHM3_B/H has a maximum reverse stand-off voltage (VWM) of 18 V, meaning it remains in high-impedance state below this voltage with leakage ≤1.0 µA. This value defines the highest continuous operating voltage before entering breakdown - critical for ensuring no interference with normal signal levels in protected circuits.
Is SMBJ18CAHM3_B/H bidirectional or unidirectional?
SMBJ18CAHM3_B/H is a bidirectional TVS diode, indicated by the "CA" suffix. It provides symmetrical clamping for both positive and negative transients without polarity marking on the SMB package, making it ideal for AC-coupled lines, differential buses, and floating grounds where voltage polarity is undefined.
Does SMBJ18CAHM3_B/H meet AEC-Q101 qualification?
The base part SMBJ18CAHM3_B/H is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For automotive use, Vishay offers the variant SMBJ18CAHM3_B/H with revision code "_X" (e.g., SMBJ18CAHM3_B/HX), which adds AEC-Q101 qualification while retaining identical electrical and thermal specifications.
What is the clamping voltage of SMBJ18CAHM3_B/H under surge conditions?
At its rated peak pulse current of 20.5 A (10/1000 µs waveform), SMBJ18CAHM3_B/H clamps to a maximum voltage of 29.2 V. This VC value represents the upper limit imposed on protected circuitry during transient events and is essential for verifying compatibility with downstream IC absolute maximum ratings.
What package type does SMBJ18CAHM3_B/H use?
SMBJ18CAHM3_B/H uses the SMB (DO-214AA) surface-mount package: 5.59 mm × 4.06 mm outline with gull-wing leads, optimized for automated placement and reflow soldering. Its low-profile design supports dense PCB layouts while delivering 600 W surge capability in minimal board area.
SMBJ18CAHM3_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):
- 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)
SMBJ18CAHM3_B/H FAQ
1.How can I place an order for SMBJ18CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CAHM3_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 SMBJ18CAHM3_B/H reliable?
The price and inventory of SMBJ18CAHM3_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 SMBJ18CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ18CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CAHM3_B/H?
SMBJ18CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CAHM3_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 SMBJ18CAHM3_B/H?
For technical support, including SMBJ18CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ18CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ18CAHM3_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 SMBJ18CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ18CAHM3_B/H?
All SMBJ18CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CAHM3_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 SMBJ18CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ18CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CAHM3_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 …
