My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMB8J20CA-E3/5B
- Part No.:
- SMB8J20CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CA-E3/5B.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,949
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMB8J20CA-E3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 20 V stand-off voltage (VWM), 32.4 V clamping voltage (VC) at 24.7 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J20CA-E3/5B datasheet, SMB8J20CA-E3/5B pinout, SMB8J20CA-E3/5B application, or SMB8J20CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low thermal resistance (RθJL = 20 °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-clamped shunt protector: under normal bias it presents <1.0 µA reverse leakage at 20 V, then rapidly transitions to low-impedance conduction when transients exceed its 22.2–24.5 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable avalanche behavior across -55 °C to +150 °C junction temperature range.
The SMB8J20CA-E3/5B delivers 800 W peak pulse power handling per 10/1000 µs waveform, with clamping voltage tightly controlled at 32.4 V - enabling robust protection of 24 V rail systems without overvoltage stress on downstream ICs like CAN transceivers or microcontroller GPIOs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before clamping initiates; defines safe interface voltage for 24 V nominal systems. |
| VBR (min/max) | 22.2 V / 24.5 V - breakdown occurs within this range at 1 mA test current; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 32.4 V at 24.7 A - clamping voltage during full-rated 800 W surge; limits protected node voltage to safe level for 3.3 V/5 V logic. |
| PPPM | 800 W - peak pulse power rating with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage at stand-off voltage; prevents signal distortion or power loss in high-impedance sensor lines. |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures. |
| RθJL | 20 °C/W - junction-to-lead thermal resistance; allows efficient heat transfer to PCB copper, critical for repetitive surge duty cycles. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction with matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals serve identical roles; bidirectional clamping enables protection on AC-coupled or floating lines without orientation constraints. |
| Case (body) | Thermal and mechanical interface | Plastic body transfers heat to PCB copper pads (0.2" × 0.2"); UL 94 V-0 rated molding compound ensures flame resistance in safety-critical assemblies. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces per stress test requirements. |
| Glass passivated junction | Ensures stable, repeatable avalanche characteristics over lifetime and temperature; eliminates parameter drift seen in epoxy-passivated alternatives. |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns; eliminates pre-bake requirement in SMT line. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving protection margin for high-speed data lines. |
| RoHS-compliant, halogen-free option available | E3 suffix denotes RoHS-compliant commercial grade; HM3 suffix provides halogen-free variant for stringent environmental compliance programs. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt TVS clamping transient energy away from precision ADC inputs and LIN transceivers. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 5a (75 V/300 ms) while surviving >1000 surges per AEC-Q101 life test. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers against field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: Bidirectional clamping element placed upstream of optocoupler input stage. Use Value: Enables IEC 61000-4-4 Level 4 (2 kV) and IEC 61000-4-5 Level 3 (2 kV) compliance without additional series impedance. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Protecting RS-485 transceiver pins in base station backhaul equipment exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary surge suppression device on differential bus lines, coordinated with common-mode chokes. Use Value: Clamps differential transients to <35 V while maintaining <10 pF junction capacitance - preserving signal integrity up to 20 Mbps. |
Use Scenario: Shielding microcontroller GPIOs driving relay coils and brushless motor gate drivers in smart home appliances. IC Role / Device Role / Timing Role: Secondary-level protection after bulk MOVs, absorbing residual high-frequency ringing energy. Use Value: Prevents latch-up and permanent damage during 8.3 ms half-sine surges up to 100 A (IFSM-equivalent stress). |
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-E3/5B | Same SMB package and 20 V VWM, but lower PPPM (600 W vs. 800 W); VBR min/max tighter (22.2–24.5 V vs. 22.2–24.5 V), identical VC. | Limited to lower-energy surge environments (IEC 61000-4-5 Level 2); not recommended for automotive under-hood use requiring AEC-Q101. | Select SMBJ20CA-E3/5B only if system-level surge testing confirms 600 W rating suffices and AEC-Q101 is not mandated. |
| SMCJ20CA-E3/57T | Higher-power SMC (DO-214AB) package; same VWM/VBR/VC but 1500 W PPPM and 120 A IPPM; RθJL = 15 °C/W. | Requires larger PCB footprint (7.11 mm × 6.22 mm vs. 4.57 mm × 3.94 mm); better suited for primary protection in DC power rails. | Choose SMCJ20CA-E3/57T when protecting 48 V systems or where higher single-pulse energy absorption is required - not a drop-in replacement. |
Compared with SMBJ20CA-E3/5B and SMCJ20CA-E3/57T, the SMB8J20CA-E3/5B uniquely balances AEC-Q101 qualification, 800 W surge capacity, and compact SMB footprint - making it optimal for space-constrained automotive and industrial edge nodes where both reliability and board area matter.
Availability
SMB8J20CA-E3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer appliance motor control requiring stable component supply and traceable sourcing.
Supply support for SMB8J20CA-E3/5B 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 density, and automotive-grade validation.
The SMB8JxxCA family targets high-reliability transient suppression in harsh environments - engineered specifically for AEC-Q101 compliance, low-profile SMT integration, and consistent clamping performance across temperature and lifetime.
FAQ
What is the clamping voltage of SMB8J20CA-E3/5B at its rated peak pulse current?
The SMB8J20CA-E3/5B has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 24.7 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuit nodes will not exceed 32.4 V during standardized surge events - critical for safeguarding 24 V system interfaces and 3.3 V/5 V logic components downstream of the SMB8J20CA-E3/5B.
Is SMB8J20CA-E3/5B suitable for automotive applications?
Yes, SMB8J20CA-E3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its -55 °C to +150 °C operating junction temperature range, MSL Level 1 reflow compatibility, and validated surge endurance make it appropriate for engine control units, ADAS sensors, and body electronics. The "HE3" or "HM3" automotive ordering variants of SMB8J20CA-E3/5B carry full AEC-Q101 certification - confirming SMB8J20CA-E3/5B's suitability when sourced with those suffixes.
How does SMB8J20CA-E3/5B differ from unidirectional SMB10J20A-E3/5B?
The SMB8J20CA-E3/5B is bidirectional with symmetrical clamping for AC or floating lines, while SMB10J20A-E3/5B is unidirectional and requires correct cathode orientation. SMB8J20CA-E3/5B offers 800 W PPPM and 24.7 A IPPM, whereas SMB10J20A-E3/5B delivers 1000 W PPPM and 30.9 A IPPM but lacks AEC-Q101 qualification in standard E3 form. Their VWM (20 V) and VC (32.4 V) match, but SMB8J20CA-E3/5B's bidirectional nature and automotive qualification define its distinct use cases - such as LIN bus or RS-485 protection where polarity independence is essential.
What PCB layout guidance applies to SMB8J20CA-E3/5B for optimal thermal and surge performance?
For optimal performance, mount SMB8J20CA-E3/5B on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay's datasheet Figure 2 derating curves. Use internal ground/power planes connected via multiple vias under each pad to reduce thermal resistance and improve surge current dissipation. Avoid narrow traces between the SMB8J20CA-E3/5B and protected IC - keep path length under 5 mm to minimize inductive voltage overshoot during fast transients. This layout ensures the SMB8J20CA-E3/5B achieves its rated 800 W PPPM and maintains RθJL ≈ 20 °C/W.
Does SMB8J20CA-E3/5B have a polarity marking, and how is it installed?
No, SMB8J20CA-E3/5B is a bidirectional TVS diode and carries no polarity marking - its symmetrical construction means either terminal may connect to the line being protected. Unlike unidirectional variants (e.g., SMB10J20A), there is no cathode band or orientation requirement. This simplifies automated placement and eliminates risk of reverse installation in AC-coupled or differential signal paths - a key advantage in applications like RS-485, CAN FD, or sensor bridge outputs where SMB8J20CA-E3/5B is commonly deployed.
SMB8J20CA-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 24.7A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J20CA-E3/5B FAQ
1.How can I place an order for SMB8J20CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CA-E3/5B 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 SMB8J20CA-E3/5B reliable?
The price and inventory of SMB8J20CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J20CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J20CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CA-E3/5B?
SMB8J20CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CA-E3/5B 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 SMB8J20CA-E3/5B?
For technical support, including SMB8J20CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CA-E3/5B requirements.
6.How does Aetrix verify that SMB8J20CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J20CA-E3/5B 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 SMB8J20CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J20CA-E3/5B?
All SMB8J20CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CA-E3/5B, 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 SMB8J20CA-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J20CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20CA-E3/5B 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 …
