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Vishay General Semiconductor - Diodes Division SMBJ20CAHE3_A/H
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- Part No.:
- SMBJ20CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CAHE3_A/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,907
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Product details
Overview
SMBJ20CAHE3_A/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 20 V standoff voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V maximum clamping voltage (VC) at 18.5 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 motor drives.
For engineers reviewing the SMBJ20CAHE3_A/H datasheet, SMBJ20CAHE3_A/H pinout, SMBJ20CAHE3_A/H application, or SMBJ20CAHE3_A/H equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, low clamping ratio (VC/VBR ≈ 1.45), AEC-Q101 qualification, and MSL Level 1 reflow compatibility are required.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports fast energy dissipation during transient events.
The device is rated for repetitive 10/1000 µs surges at 0.01% duty cycle and derates linearly above 25 °C ambient, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W. Junction temperature range spans −55 °C to +150 °C, supporting operation in automotive under-hood and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - Confirmed bidirectional breakdown threshold; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamped voltage during 600 W transient; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; validates capability against IEC 61000-4-5 Level 4 surges. |
| IPPM | 18.5 A - Peak pulse current corresponding to VC; directly usable for PCB trace sizing and layout margining. |
| Junction Temp Range | −55 °C to +150 °C - Enables deployment in extended-temperature environments including automotive engine compartments. |
| MSL Level | Level 1 per J-STD-020 - Supports standard SMT reflow without baking; simplifies manufacturing integration. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; symmetrical with cathode in bidirectional operation | Enables clamping in both voltage polarities - no external orientation dependency required for AC or floating nodes. |
| Cathode | Current exit terminal in forward bias; electrically identical to anode in bidirectional configuration | Provides matched clamping thresholds across positive and negative transients; eliminates need for dual-device solutions. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Single-device protection for AC signals, differential buses (e.g., RS-485), or ungrounded sensor outputs without polarity concerns. |
| AEC-Q101 qualified | Validated for automotive applications including body electronics and infotainment power rails where reliability under thermal cycling is critical. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) when properly mounted. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping - preserves margin for 3.3 V or 5 V logic interfaces downstream of protection. |
| MSL Level 1 | Eliminates pre-reflow baking requirements and supports high-throughput automated assembly in standard SMT lines. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protecting gate drivers and current-sense amplifiers from inductive kickback during MOSFET switching in BLDC inverters. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power rail inputs and signal lines to clamp ±100 V transients within nanoseconds. Use Value: Prevents latch-up or permanent damage to 3.3 V microcontrollers and isolated gate drivers exposed to 60 V bus switching noise. |
Use Scenario: Safeguarding LIN bus transceivers and LED driver ICs from load dump and jump-start surges in door modules. IC Role / Device Role / Timing Role: Standoff-rated clamping element on 12 V supply and data lines, activated only during >20 V excursions. Use Value: Maintains functional safety compliance (ISO 16750-2) by limiting transient voltage to <33 V at point-of-load during 12 V system faults. |
| Consumer Appliance Sensor Interfaces | Telecom Power Supply Inputs |
|
Use Scenario: Shielding temperature and humidity sensor analog outputs from ESD events during factory handling and field maintenance. IC Role / Device Role / Timing Role: Low-capacitance (≈150 pF typical) bidirectional suppressor placed adjacent to ADC input pins. Use Value: Preserves signal integrity with <0.5% gain error shift post-ESD, verified per IEC 61000-4-2 Level 4 (8 kV contact). |
Use Scenario: Front-end surge suppression on 48 V telecom rectifier outputs feeding PoE injectors and baseband processors. IC Role / Device Role / Timing Role: Primary clamping stage absorbing bulk surge energy before secondary TVS or crowbar circuits engage. Use Value: Reduces downstream component count by handling >90% of 10/1000 µs surge energy, validated at 600 W with 0.01% duty cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-E3/52 | Same electrical specs and SMB package; RoHS-compliant commercial grade without AEC-Q101 qualification | Lacks automotive qualification; suitable for consumer/industrial use where extended temperature validation not required | Select when cost sensitivity outweighs automotive reliability requirements and full AEC-Q101 documentation is unnecessary. |
| SMCJ20CAHE3_A/H | Same VWM, VBR, and VC; higher 1500 W PPPM rating in larger SMC (DO-214AB) package | Requires larger PCB footprint and higher thermal mass; better suited for high-energy surge zones like AC mains entry | Choose when system-level surge testing exceeds 600 W - e.g., IEC 61000-4-5 Level 5 - and board space allows SMC footprint. |
Compared with SMBJ20CAHE3_A/H, SMBJ20CA-E3/52 offers identical clamping performance at lower qualification cost, while SMCJ20CAHE3_A/H trades compactness for 2.5× higher surge capacity - enabling tiered protection architecture where primary (SMCJ) and secondary (SMBJ) stages coexist.
Availability
SMBJ20CAHE3_A/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, consumer appliance sensor interfaces, and telecom power supply inputs requiring stable component supply with AEC-Q101 assurance and MSL Level 1 manufacturability.
Supply support for SMBJ20CAHE3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMBJ series was developed for high-reliability transient suppression in space-constrained, high-volume SMT applications - particularly targeting automotive, industrial automation, and communications infrastructure where bidirectional clamping and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ20CAHE3_A/H at its rated peak pulse current?
The SMBJ20CAHE3_A/H has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current (IPPM) of 18.5 A, measured using the standardized 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is confirmed in the Vishay datasheet Document Number 88392, page 2. The SMBJ20CAHE3_A/H maintains this clamping performance across its full operating temperature range.
Is SMBJ20CAHE3_A/H suitable for automotive applications?
Yes, SMBJ20CAHE3_A/H is AEC-Q101 qualified, as indicated by the "HE3" suffix in its part number, confirming stress testing for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock. It is specified for operation from −55 °C to +150 °C and meets MSL Level 1 for lead-free reflow - making SMBJ20CAHE3_A/H appropriate for body electronics, lighting modules, and infotainment power rails where qualification evidence is contractually required.
How does the bidirectional design of SMBJ20CAHE3_A/H affect its circuit implementation?
The bidirectional design of SMBJ20CAHE3_A/H means it functions identically under positive and negative voltage transients, eliminating polarity marking and enabling placement across floating or AC-coupled nodes without orientation constraints. Unlike unidirectional TVS diodes, SMBJ20CAHE3_A/H provides symmetrical clamping thresholds (VBR = 22.2–24.5 V in both directions), which simplifies layout for differential interfaces such as RS-485, CAN FD, or isolated sensor bridges where ground reference is unstable.
What is the thermal resistance of SMBJ20CAHE3_A/H, and how does it impact power dissipation?
SMBJ20CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W, measured on 0.2" × 0.2" copper pads per terminal. These values define its steady-state power handling: at 25 °C ambient, it dissipates 5.0 W continuously, but must be derated above that temperature per Figure 2 in the Vishay datasheet. For SMBJ20CAHE3_A/H, this means usable DC power drops to ~3.5 W at 75 °C ambient - critical for thermal margining in enclosed enclosures.
Can SMBJ20CAHE3_A/H replace a unidirectional TVS diode in an existing design?
SMBJ20CAHE3_A/H can replace a unidirectional TVS in circuits where polarity is undefined, AC-coupled, or subject to reverse-bias transients - but only if the original design does not rely on forward conduction (e.g., for DC biasing or rectification). Since SMBJ20CAHE3_A/H has no cathode marking and identical behavior in both directions, it cannot perform rectifying functions. Verify that downstream components tolerate bidirectional clamping and that VWM = 20 V remains compatible with system DC operating margins before substituting SMBJ20CAHE3_A/H.
SMBJ20CAHE3_A/H 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 18.5A
- 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)
SMBJ20CAHE3_A/H FAQ
1.How can I place an order for SMBJ20CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CAHE3_A/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 SMBJ20CAHE3_A/H reliable?
The price and inventory of SMBJ20CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ20CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CAHE3_A/H?
SMBJ20CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CAHE3_A/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 SMBJ20CAHE3_A/H?
For technical support, including SMBJ20CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CAHE3_A/H requirements.
6.How does Aetrix verify that SMBJ20CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ20CAHE3_A/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 SMBJ20CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ20CAHE3_A/H?
All SMBJ20CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CAHE3_A/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 SMBJ20CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMBJ20CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CAHE3_A/H Tags
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