My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ40CAHM3/I
- Part No.:
- SMBJ40CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CAHM3/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,362
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ40CAHM3/I 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 40 V stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 9.3 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ40CAHM3/I datasheet, SMBJ40CAHM3/I pinout, SMBJ40CAHM3/I application, or SMBJ40CAHM3/I equivalent, this device is selected for robust ESD and surge immunity in bidirectional AC-coupled or floating signal paths where low clamping voltage, fast response (<1 ns), and AEC-Q101-compliant reliability are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) ranging from 44.4 V to 49.1 V at 1 mA test current. Its low incremental surge resistance ensures minimal voltage overshoot during transient events, while the glass-passivated junction delivers stable performance under repetitive surge stress.
Designed for surface-mount assembly on standard PCB copper pads (0.2" × 0.2"), it meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak. The HM3 suffix confirms halogen-free, RoHS-compliant construction with AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 36–40 V nominal systems. |
| VBR min/max | 44.4 V / 49.1 V at IT = 1 mA - Confirmed bidirectional breakdown range; ensures symmetrical clamping behavior in AC or floating circuits. |
| VC @ IPPM | 64.5 V at 9.3 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to ≤64.5 V under worst-case 600 W transient. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge testing. |
| ID @ VWM | 1.0 µA - Reverse leakage at 40 V; negligible power loss and signal distortion in high-impedance sensor or communication lines. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial enclosures without derating. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline with 5.59 mm × 3.94 mm footprint; compatible with automated pick-and-place and IR reflow. |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package. No polarity marking; terminals are non-directional and electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve identical roles; conducts surge current in either direction when voltage exceeds ±VBR - no cathode band or polarity identification required. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled, differential, or floating signal lines (e.g., RS-485, CAN, USB D+/D−) without polarity concerns. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges (1 kV open-circuit / 0.5 kA short-circuit) without degradation when mounted per recommended pad layout. |
| AEC-Q101 qualified (HM3) | Validated for automotive applications including infotainment interfaces and body control modules requiring extended temperature cycling and humidity exposure reliability. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; supports sustainability compliance for global OEM BOMs. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile usage (peak 260 °C) without dry-pack or baking requirements - reduces manufacturing overhead. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I/O (CAN/LIN) in factory-floor pressure/temperature sensors exposed to relay switching noise and ESD. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed at connector entry point to shunt transients before reaching precision ADC or microcontroller GPIO. Use Value: Limits induced surge voltage to ≤64.5 V, preventing latch-up or permanent damage to 3.3 V/5 V interface ICs while maintaining <1 µA leakage at 40 V system bias. |
Use Scenario: Safeguarding LIN bus transceivers and LED driver outputs in door module ECUs subjected to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on power-supplied signal lines, operating alongside upstream fuse and downstream filter capacitors. Use Value: Withstands 10/1000 µs surges up to 600 W without parameter shift, ensuring functional safety compliance (ISO 16750-2) across -40 °C to +125 °C ambient. |
| Telecom Line Protection | Consumer Audio Equipment |
|
Use Scenario: Shielding Ethernet PHY magnetics secondary windings and PoE data lines against lightning-induced surges in outdoor access points. IC Role / Device Role / Timing Role: Secondary-side TVS positioned after isolation transformer to suppress common-mode transients crossing into PHY IC. Use Value: Symmetrical clamping ensures equal protection for both differential pairs; 64.5 V VC prevents PHY overvoltage beyond absolute maximum ratings during 10/1000 µs events. |
Use Scenario: Guarding headphone jack and USB-C audio interface lines in portable speakers against user-handling ESD (±8 kV contact discharge). IC Role / Device Role / Timing Role: Fast-response transient suppressor placed directly at connector, minimizing trace inductance between threat source and protection device. Use Value: Sub-nanosecond response time and <1 µA leakage preserve audio signal integrity and battery runtime while passing IEC 61000-4-2 Level 4 ESD immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CAHE3/I | Same electrical specs and SMB package; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Suitable for commercial/industrial use only; not approved for automotive under-hood or safety-critical modules. | Select when halogen-free content or automotive qualification is not required - lower cost alternative with identical clamping performance. |
| SMAJ40CAHM3 | Lower PPPM (400 W vs. 600 W); same VWM/VC but reduced IPPM (6.2 A vs. 9.3 A); SMA (DO-214AC) package with smaller footprint (4.57 mm × 2.79 mm). | Used where board space is constrained and surge threat level is limited to IEC 61000-4-5 Level 2 (0.5 kV/2 Ω). | Choose for space-constrained consumer designs accepting reduced surge margin; verify thermal dissipation with smaller pad area. |
Compared with SMBJ40CAHM3/I, SMBJ40CAHE3/I offers identical protection performance without halogen-free or automotive qualification, while SMAJ40CAHM3 trades 33 % lower surge capacity and smaller package for tighter layout integration - neither is pin-compatible due to differing package outlines (SMB vs. SMA), requiring PCB redesign.
Availability
SMBJ40CAHM3/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and telecom line protection requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant reliability.
Supply support for SMBJ40CAHM3/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 optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, lightning, and inductive switching surges is critical.
FAQ
What is the clamping voltage of SMBJ40CAHM3/I at its rated peak pulse current?
The SMBJ40CAHM3/I has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMBJ40CAHM3/I maintains this clamping performance across its full operating temperature range.
Is SMBJ40CAHM3/I suitable for automotive applications?
Yes, SMBJ40CAHM3/I is AEC-Q101 qualified and constructed with halogen-free, RoHS-compliant materials (HM3 suffix), making it suitable for automotive applications including body control modules, infotainment interfaces, and lighting drivers. Its -55 °C to +150 °C operating junction temperature range, MSL Level 1 rating, and validated surge endurance support deployment in under-hood and cabin environments per ISO 16750-2 requirements.
How does the bidirectional design of SMBJ40CAHM3/I affect its circuit placement?
The bidirectional design of SMBJ40CAHM3/I eliminates polarity sensitivity - it can be placed across any two nodes requiring symmetrical overvoltage protection, such as differential signal lines (RS-485, CAN), AC-coupled paths, or floating power rails. Unlike unidirectional TVS diodes, SMBJ40CAHM3/I requires no cathode band alignment or orientation verification during placement, simplifying layout and reducing assembly errors in high-volume SMT production.
What is the maximum reverse leakage current of SMBJ40CAHM3/I at its stand-off voltage?
The SMBJ40CAHM3/I exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 40 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes standby power loss in battery-operated equipment - a key advantage over higher-leakage alternatives that could compromise accuracy or runtime.
Does SMBJ40CAHM3/I require special PCB layout considerations for optimal surge performance?
Yes - optimal surge performance of SMBJ40CAHM3/I requires mounting on minimum recommended copper pad areas (0.2" × 0.2" or 5.0 mm × 5.0 mm per terminal) to achieve specified 600 W peak pulse power rating. Reduced pad size increases thermal impedance, lowering IPPM capability and risking parametric shift or failure under repeated surges. Trace inductance must also be minimized by placing SMBJ40CAHM3/I directly at the threat entry point with short, wide traces to ground or return path.
SMBJ40CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ40CAHM3/I FAQ
1.How can I place an order for SMBJ40CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CAHM3/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 SMBJ40CAHM3/I reliable?
The price and inventory of SMBJ40CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ40CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CAHM3/I?
SMBJ40CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CAHM3/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 SMBJ40CAHM3/I?
For technical support, including SMBJ40CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CAHM3/I requirements.
6.How does Aetrix verify that SMBJ40CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ40CAHM3/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 SMBJ40CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ40CAHM3/I?
All SMBJ40CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CAHM3/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 SMBJ40CAHM3/I part is unused and in its original packaging.
Return procedure for SMBJ40CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CAHM3/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 …
