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Vishay General Semiconductor - Diodes Division SMAJ20CHE3/5A
- Part No.:
- SMAJ20CHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20CHE3/5A.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,096
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Product details
Overview
SMAJ20CHE3/5A from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection of signal and power lines. It features a 20 V stand-off voltage (VWM), 35.8 V maximum clamping voltage (VC) at 11.2 A peak pulse current (IPPM), 400 W peak pulse power rating (10/1000 µs), and AEC-Q101 qualification for automotive reliability - deployed in CAN bus interfaces, sensor supply rails, and microcontroller I/O protection.
For engineers reviewing the SMAJ20CHE3/5A datasheet, SMAJ20CHE3/5A pinout, SMAJ20CHE3/5A application, or SMAJ20CHE3/5A equivalent, this page delivers verified electrical parameters, automotive-grade qualification status, clamping performance under standardized surge waveforms, and direct substitution guidance aligned with Vishay's official SMAJ family documentation.
Technical Context
The SMAJ20CHE3/5A operates as a bi-directional avalanche diode, symmetrically clamping voltage transients above ±22.2 V (VBR min) and below ±20 V (VWM) in both polarities. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the DO-214AC package supports automated SMT placement and meets MSL Level 1 per J-STD-020.
It delivers 400 W peak pulse power (10/1000 µs waveform) up to 78 V; above that threshold, derated to 300 W. Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, enabling reliable operation in ambient temperatures from –55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR min/VBR max | 22.2 V / 27.1 V - Breakdown occurs within this range at 1 mA test current; ensures consistent turn-on across production lots. |
| VC @ IPPM | 35.8 V - Clamped voltage during 11.2 A 10/1000 µs surge; limits downstream IC stress to safe levels in automotive load-dump scenarios. |
| IPPM | 11.2 A - Peak surge current capability under standard waveform; validates protection against ISO 7637-2 Pulse 1/2a/5a events. |
| PPPM | 400 W - Peak pulse power handling (≤78 V); supports repeated transient suppression without thermal runaway on adequate PCB copper. |
| TJ Range | –55 °C to +150 °C - Full operational junction temperature range; qualified per AEC-Q101 for under-hood automotive use. |
| Leakage ID | <1.0 µA at 20 V - Ultra-low reverse leakage preserves signal integrity and battery life in always-on circuits. |
Pinout & Package
DO-214AC (SMA) surface-mount package: molded epoxy case with matte tin-plated leads, RoHS-compliant, MSL Level 1, 260 °C reflow capable. No polarity marking for bi-directional configuration - terminals are symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche junction | Either terminal serves as cathode or anode depending on transient polarity; no orientation required during placement. |
| Case (body) | Non-connected mechanical structure | No internal connection; provides mechanical anchoring and thermal path via soldered leads only. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensors. |
| 400 W peak pulse power (≤78 V) | Withstands high-energy transients like ISO 7637-2 Pulse 5a (load dump) without degradation when mounted per recommended pad layout. |
| Glass-passivated chip junction | Ensures long-term stability of breakdown voltage and leakage current across temperature and lifetime stress conditions. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD, inductive switching), improving system-level immunity. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow assembly without moisture-related defects or parametric shift. |
Applications
| Automotive Power Line Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12 V/24 V power distribution networks in vehicles from load dump, jump-start surges, and alternator ripple. IC Role / Device Role / Timing Role: Bi-directional TVS placed between power rail and ground to clamp transients before they reach DC-DC converters or MCU power supplies. Use Value: Limits voltage excursions to ≤35.8 V during 11.2 A surges, preventing latch-up or permanent damage to downstream PMICs and microcontrollers. |
Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TJA1042, SN65HVD256) against ESD and coupled noise on differential bus lines. IC Role / Device Role / Timing Role: Bi-directional TVS connected line-to-line and line-to-ground to absorb common-mode and differential-mode transients without distorting signal edges. Use Value: Maintains signal integrity by clamping <100 ns transients to <40 V while adding <1 pF parasitic capacitance - negligible impact on 5 Mbps CAN FD timing. |
| Industrial Sensor Interface Protection | Consumer Device USB/UART Line Guarding |
Use Scenario: Shielding analog and digital outputs of pressure, temperature, and position sensors in factory automation equipment exposed to motor drive noise. IC Role / Device Role / Timing Role: TVS placed at sensor connector interface to shunt induced surges from nearby VFDs or solenoid actuation. Use Value: Withstands repetitive 400 W pulses (0.01% duty cycle) without parameter drift, ensuring long-term reliability in harsh EMI environments. |
Use Scenario: Adding surge resilience to USB 2.0 D+/D– or UART TX/RX lines in portable medical monitors, smart home hubs, and POS terminals. IC Role / Device Role / Timing Role: Low-capacitance bi-directional TVS guarding data lines against human-body-model (HBM) ESD and cable discharge events. Use Value: Delivers <1 µA leakage at 20 V and sub-36 V clamping, preserving signal rise/fall times and preventing false logic transitions during normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20AHE3/5A | Uni-directional variant; cathode-banded; VBR min = 22.2 V, VC = 32.4 V @ 12.3 A. | Requires correct polarity alignment; better clamping for DC-biased lines (e.g., 5 V/3.3 V supply rails). | Select when protecting unidirectional signals with known polarity and tighter clamping voltage is critical. |
| SMBJ20CHE3/5A | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM. | Higher power handling and thermal mass; requires larger PCB footprint and different pad layout. | Choose when system-level surge requirements exceed 400 W or extended thermal dissipation is needed. |
Compared with SMAJ20CHE3/5A, the uni-directional SMAJ20AHE3/5A offers lower clamping (32.4 V vs. 35.8 V) but mandates correct orientation, while SMBJ20CHE3/5A provides 50 % higher pulse power in a larger footprint - neither is pin-compatible, but both serve overlapping protection roles with trade-offs in layout, polarity, and energy capacity.
Availability
SMAJ20CHE3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and consumer device communication ports requiring stable component supply with AEC-Q101 traceability and full RoHS compliance.
Supply support for SMAJ20CHE3/5A 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 automotive-grade validation.
The SMAJ series is engineered specifically for high-reliability transient suppression in automotive and industrial environments, combining AEC-Q101 qualification, robust surge handling, and surface-mount scalability for modern electronics.
FAQ
What does the "HE3" suffix indicate in SMAJ20CHE3/5A?
The HE3 suffix denotes high-reliability, automotive-grade qualification per AEC-Q101, RoHS compliance, and enhanced whisker resistance meeting JESD201 Class 2. This distinguishes SMAJ20CHE3/5A from commercial-grade E3 variants and confirms suitability for under-hood and safety-critical vehicle systems - a key requirement explicitly documented in Vishay's ordering information and revision notes for SMAJ20CHE3/5A.
Is SMAJ20CHE3/5A bi-directional or uni-directional?
SMAJ20CHE3/5A is a bi-directional TVS diode, as confirmed by its "CA" designation in the full part family name (SMAJ20CA) and absence of cathode band marking. Its electrical characteristics - including symmetric VBR, VWM, and VC values - apply identically in both polarities, making it ideal for AC-coupled or floating signal lines such as CAN bus or Ethernet PHY interfaces where polarity is undefined.
What is the maximum clamping voltage of SMAJ20CHE3/5A under surge conditions?
The maximum clamping voltage (VC) of SMAJ20CHE3/5A is 35.8 V at 11.2 A peak pulse current (IPPM) with a 10/1000 µs waveform, per Vishay Document Number 88390, Table on page 2. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during worst-case transient events - a critical parameter for validating compatibility with downstream IC absolute maximum ratings.
Does SMAJ20CHE3/5A meet automotive qualification standards?
Yes, SMAJ20CHE3/5A is explicitly qualified to AEC-Q101, as stated in the "MECHANICAL DATA" section and footnote (1) of Vishay's datasheet (Document Number 88390). The HE3 suffix further certifies compliance with JESD201 Class 2 whisker testing and RoHS Directive 2002/95/EC - confirming its readiness for deployment in automotive ECUs, ADAS modules, and body control units without additional qualification effort.
What package type and mounting specifications apply to SMAJ20CHE3/5A?
SMAJ20CHE3/5A uses the DO-214AC (SMA) surface-mount package, with dimensions and pad layout defined in Figure 5 of Vishay Document Number 88390. It is rated for MSL Level 1, supports 260 °C lead-free reflow (40 s solder dip), and requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for full 400 W pulse power rating - all verified in the "MECHANICAL DATA" and "THERMAL CHARACTERISTICS" sections of the official datasheet.
SMAJ20CHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- 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:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 11.2A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ20CHE3/5A FAQ
1.How can I place an order for SMAJ20CHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20CHE3/5A 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 SMAJ20CHE3/5A reliable?
The price and inventory of SMAJ20CHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ20CHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ20CHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20CHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20CHE3/5A?
SMAJ20CHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20CHE3/5A 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 SMAJ20CHE3/5A?
For technical support, including SMAJ20CHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20CHE3/5A requirements.
6.How does Aetrix verify that SMAJ20CHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ20CHE3/5A 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 SMAJ20CHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ20CHE3/5A?
All SMAJ20CHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20CHE3/5A, 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 SMAJ20CHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ20CHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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