My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ20CAHM3_A/H
- Part No.:
- SMBJ20CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CAHM3_A/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,747
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ20CAHM3_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 a 20 V stand-off 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 and telecom systems.
For engineers reviewing the SMBJ20CAHM3_A/H datasheet, SMBJ20CAHM3_A/H pinout, SMBJ20CAHM3_A/H application, or SMBJ20CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche behavior in both directions, enabling robust surge suppression without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, while the SMB package supports high-power dissipation (600 W) within a low-profile footprint.
The SMBJ20CAHM3_A/H is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and exhibits a VBR temperature coefficient of 0.094 %/°C - critical for stable clamping across automotive and industrial ambient ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse working voltage before clamping initiates |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - guaranteed avalanche onset range under standardized test conditions |
| VC @ IPPM | 32.4 V at 18.5 A - clamped voltage during 600 W transient, defining protected circuit's max stress level |
| PPPM | 600 W - peak pulse power handling with 10/1000 µs waveform, duty cycle ≤ 0.01 % |
| IPPM | 18.5 A - maximum non-repetitive surge current the device safely conducts without failure |
| TJ max. | +150 °C - maximum junction temperature, enabling use in under-hood or high-ambient industrial environments |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, guiding PCB copper pad sizing for thermal management |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; common node in bidirectional operation | Connected to protected line; identical electrical behavior as cathode due to symmetry |
| Cathode | Current exit point in forward bias; common node in bidirectional operation | Connected to protected line; functionally interchangeable with anode in this bidirectional TVS |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-earth) with margin |
| AEC-Q101 qualified | Validated for automotive electronics applications including engine control and body modules |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for industrial and consumer end equipment |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking preconditioning |
Applications
| Industrial Sensor Interfaces | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) from ESD and load dump-induced transients in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤32.4 V, preventing latch-up or damage to 3.3 V/5 V ADC front-ends while maintaining signal integrity. |
Use Scenario: Safeguarding LIN bus transceivers and LED driver control lines against battery line transients during jump-start or alternator load dump. IC Role / Device Role / Timing Role: Secondary-level TVS on low-voltage control nets downstream of primary DC-DC converters. Use Value: Withstands 18.5 A surge current and clamps to 32.4 V, ensuring uninterrupted communication during ISO 7637-2 Pulse 5a events. |
| Telecom Power Supply Inputs | Consumer USB-C Port Protection |
|
Use Scenario: Input-stage surge suppression on 24 V/48 V telecom power rails exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: First-line transient suppressor before DC-DC regulation and hot-swap controllers. Use Value: 600 W rating and 100 °C/W RθJA allow reliable operation with minimal PCB copper, reducing BOM count vs. multi-stage designs. |
Use Scenario: Bidirectional overvoltage protection on USB-C CC and VCONN lines susceptible to ESD and connector mating transients. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF typical) TVS placed directly at connector footprint. Use Value: Fast response time and symmetrical clamping prevent data corruption during ±8 kV HBM ESD events without signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CAHE3_A/H | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial-grade industrial equipment where automotive qualification is unnecessary | Select when halogen-free content or automotive reliability validation is not required |
| SMAJ20CAHM3_A/H | Lower 400 W PPPM; same VWM/VC but reduced IPPM (12.3 A); SMA package (smaller footprint, higher RθJA) | Fits space-constrained layouts but requires derating in high-energy surge environments | Choose only if system-level surge testing confirms 400 W is sufficient and thermal margin allows SMA thermal resistance |
Compared with SMBJ20CAHM3_A/H, SMBJ20CAHE3_A/H trades halogen-free construction and AEC-Q101 for lower cost in non-automotive settings, while SMAJ20CAHM3_A/H reduces footprint and power handling - requiring careful validation against IEC 61000-4-5 and ISO 7637-2 test profiles.
Availability
SMBJ20CAHM3_A/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and telecom power supply inputs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ20CAHM3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, AEC-Q101 compliance, and consistent clamping behavior are mandatory.
FAQ
What is the clamping voltage of SMBJ20CAHM3_A/H at its rated peak pulse current?
The SMBJ20CAHM3_A/H has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 18.5 A using the 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is measured per ANSI/IEEE C62.35 standards. The SMBJ20CAHM3_A/H maintains this clamping performance across its specified operating temperature range.
Is SMBJ20CAHM3_A/H suitable for automotive applications?
Yes, SMBJ20CAHM3_A/H is AEC-Q101 qualified and specifically designed for automotive use, including body control modules, infotainment power supplies, and sensor interfaces. Its halogen-free, RoHS-compliant construction, MSL Level 1 rating, and guaranteed performance from -55 °C to +150 °C make it appropriate for under-hood and cabin applications subject to ISO 7637-2 and ISO 16750-2 stress conditions. The SMBJ20CAHM3_A/H meets these requirements without derating.
How does the bidirectional design of SMBJ20CAHM3_A/H affect its circuit implementation?
The bidirectional design of SMBJ20CAHM3_A/H eliminates polarity sensitivity, allowing direct placement across AC-coupled lines, differential buses (e.g., RS-485), or floating sensor outputs without regard to anode/cathode orientation. Unlike unidirectional TVS diodes, SMBJ20CAHM3_A/H provides symmetrical clamping in both directions - simplifying layout, reducing inventory SKUs, and avoiding misplacement errors during automated assembly. No marking is present on the SMB package.
What is the thermal resistance of SMBJ20CAHM3_A/H, and how does it impact PCB layout?
SMBJ20CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value guides minimum copper area requirements: reducing pad size increases thermal impedance, risking junction overheating during repetitive surges. For sustained surge duty cycles or high ambient temperatures, increasing copper area or adding thermal vias is recommended to maintain SMBJ20CAHM3_A/H within its 150 °C TJ limit.
Does SMBJ20CAHM3_A/H meet industry surge immunity standards such as IEC 61000-4-5?
Yes, SMBJ20CAHM3_A/H's 600 W peak pulse power rating with 10/1000 µs waveform aligns with IEC 61000-4-5 Level 4 (4 kV line-to-earth, 2 kV line-to-line) when properly implemented with appropriate PCB layout and upstream impedance. Its 32.4 V clamping voltage ensures protected ICs see well-below-damage thresholds during standardized surge tests. System-level validation is required, but SMBJ20CAHM3_A/H provides the foundational clamping performance needed to pass IEC 61000-4-5 compliance testing.
SMBJ20CAHM3_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:
- 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)
SMBJ20CAHM3_A/H FAQ
1.How can I place an order for SMBJ20CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CAHM3_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 SMBJ20CAHM3_A/H reliable?
The price and inventory of SMBJ20CAHM3_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 SMBJ20CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ20CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CAHM3_A/H?
SMBJ20CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CAHM3_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 SMBJ20CAHM3_A/H?
For technical support, including SMBJ20CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ20CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ20CAHM3_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 SMBJ20CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ20CAHM3_A/H?
All SMBJ20CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CAHM3_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 SMBJ20CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMBJ20CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CAHM3_A/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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
