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Vishay General Semiconductor - Diodes Division SMAJ120CA-E3/5A
- Part No.:
- SMAJ120CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120CA-E3/5A.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,980
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Product details
Overview
SMAJ120CA-E3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 120 V standoff voltage (VWM), 133–147 V breakdown range (VBR at 1 mA), 193 V maximum clamping voltage (VC) at 1.6 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform), suitable for protecting MOSFETs and sensor interfaces in industrial motor drives.
For engineers reviewing the SMAJ120CA-E3/5A datasheet, SMAJ120CA-E3/5A pinout, SMAJ120CA-E3/5A application, or SMAJ120CA-E3/5A equivalent, key selection criteria include bidirectional clamping capability, 120 V working voltage compatibility with 24/48 V DC bus systems, low leakage (<1.0 μA at VWM), and AEC-Q101 qualification readiness via HE3/HM3 variants.
Technical Context
This device operates as a voltage-clamping protector using an avalanche junction structure, responding in <1 ps to transient overvoltages. Its bidirectional symmetry enables use without polarity consideration across AC-coupled or floating lines, and its 120 V VWM supports protection of 100 V-rated components in telecom power supplies and industrial PLC I/O modules.
The SMAJ120CA-E3/5A delivers 193 V clamping at 1.6 A IPPM under 10/1000 μs surge, with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W - enabling reliable operation up to +150 °C junction temperature when mounted on 5.0 mm × 5.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit for protected circuit DC bias. |
| VBR (min/max) | 133 V / 147 V at 1 mA - Breakdown onset range; ensures predictable clamping initiation above normal operating voltage. |
| VC @ IPPM | 193 V at 1.6 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W - Peak pulse power handling (10/1000 μs); sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges. |
| ID @ VWM | <1.0 μA - Reverse leakage at rated standoff; negligible loading on high-impedance sensor or reference lines. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in enclosed industrial enclosures without active cooling. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with standard SMT reflow profiles (MSL Level 1, 260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; bidirectional construction means no polarity marking - both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Either terminal serves as input/output for bidirectional clamping; no cathode band marking required. |
| Case (body) | Thermal and mechanical interface | Non-conductive epoxy body; heat dissipation relies on PCB copper pad area (0.2" × 0.2" recommended per terminal). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating differential lines without polarity constraints. |
| 400 W peak pulse power (10/1000 μs) | Withstands repeated lightning-induced surges per IEC 61000-4-5 without degradation when properly heatsinked. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage margin between clamping and breakdown - improves protection margin for 130 V-rated components. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; reduces manufacturing handling overhead. |
| AEC-Q101 qualification option | HE3/HM3 variants support automotive subsystems requiring qualified TVS devices (e.g., body control modules). |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of gate drivers and current-sense amplifiers against switching-induced transients in 48 V BLDC inverters. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed across DC bus inputs and gate drive return paths. Use Value: Limits transient overshoot to ≤193 V, preventing latch-up or oxide rupture in 200 V-rated Si MOSFETs and isolated amplifiers. |
Use Scenario: Input-stage surge suppression in 48 V telecom rectifier modules exposed to lightning-induced line surges. IC Role / Device Role / Timing Role: Primary-level TVS shunting IEC 61000-4-5 1 kV/2 Ω surges before upstream DC/DC converters. Use Value: Absorbs 400 W peak energy within 1 ms, maintaining output regulation and avoiding brownout resets in downstream PMICs. |
| Automotive Body Control Modules | Industrial Sensor Signal Conditioning |
|
Use Scenario: CAN FD transceiver protection in 12 V vehicle networks subjected to load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamp on CAN_H/CAN_L differential pair, referenced to chassis ground. Use Value: Maintains signal integrity by clamping common-mode transients to <200 V while preserving <1 pF junction capacitance at 0 V bias. |
Use Scenario: Overvoltage safeguard for 4–20 mA loop-powered pressure sensors in factory automation cabinets. IC Role / Device Role / Timing Role: Parallel-connected TVS across loop terminals to divert field-wiring induced surges. Use Value: Adds <1 μA leakage at 120 V, ensuring loop accuracy remains within ±0.1% full-scale error budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-E3/5A | Unidirectional; cathode-marked; 193 V clamping same, but only conducts in one polarity. | Requires correct orientation on DC-biased lines; unsuitable for AC or floating differential signals. | Select when protecting unidirectional DC rails where polarity is fixed and lower cost is prioritized. |
| SMBJ120CA-E3/52 | Same VWM/VC, but SMB (DO-214AA) package: 5.28 mm × 4.50 mm vs. SMA's 4.50 mm × 2.79 mm - larger footprint, higher PPPM = 600 W. | Higher surge margin for critical infrastructure; requires larger PCB area and different stencil design. | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and layout space permits SMB footprint. |
Compared with SMAJ120A-E3/5A, the SMAJ120CA-E3/5A eliminates polarity dependency for flexible layout; versus SMBJ120CA-E3/52, it trades 50% lower surge rating for 30% smaller board area - optimizing space-constrained industrial controllers.
Availability
SMAJ120CA-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and industrial sensor signal conditioning requiring stable component supply and RoHS-compliant commercial-grade TVS protection.
Supply support for SMAJ120CA-E3/5A 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, rectifiers, and protection devices with emphasis on reliability, power efficiency, and automotive qualification.
The SMAJ series targets robust transient suppression in harsh environments - engineered for high-energy surge absorption, low clamping voltage, and seamless integration into automated SMT assembly lines.
FAQ
What is the maximum clamping voltage of the SMAJ120CA-E3/5A under a 10/1000 μs surge?
The SMAJ120CA-E3/5A has a maximum clamping voltage (VC) of 193 V at 1.6 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and reflects worst-case voltage seen by protected circuitry during surge events - critical for validating safe operating margins of downstream 200 V-rated MOSFETs or op-amps.
Is the SMAJ120CA-E3/5A suitable for automotive applications?
The SMAJ120CA-E3/5A itself is commercial-grade (E3 suffix), but Vishay offers AEC-Q101-qualified versions under HE3/HM3 suffixes (e.g., SMAJ120CAHE3_A/I). For automotive body control modules or infotainment power rails, those qualified variants must be selected - the SMAJ120CA-E3/5A meets all electrical specs but lacks formal automotive qualification documentation.
How does the bidirectional design of SMAJ120CA-E3/5A affect PCB layout?
The bidirectional design of SMAJ120CA-E3/5A eliminates polarity constraints: no cathode band marking exists, and either terminal functions identically. This simplifies layout on differential or AC-coupled traces (e.g., CAN, RS-485), removes orientation verification during placement, and avoids costly rework from reversed unidirectional TVS devices - directly reducing SMT line downtime.
What is the thermal resistance of SMAJ120CA-E3/5A, and how does it impact derating?
The SMAJ120CA-E3/5A has RθJA = 120 °C/W (junction-to-ambient) and RθJL = 30 °C/W (junction-to-lead), measured on 5.0 mm × 5.0 mm copper pads. At 75 °C ambient, its 400 W peak pulse rating derates to ~280 W per Vishay Fig. 2 - meaning sustained surge repetition requires thermal design validation to avoid exceeding +150 °C junction limit.
Does SMAJ120CA-E3/5A meet any industry surge immunity standards out-of-the-box?
The SMAJ120CA-E3/5A is rated for 400 W peak pulse power with a 10/1000 μs waveform - matching IEC 61000-4-5 Level 3 (1 kV open-circuit / 2 Ω source impedance) test conditions. While not certified standalone, its parameters enable compliant system-level designs when combined with proper PCB layout (e.g., short trace lengths, ground plane coupling) and upstream filtering.
SMAJ120CA-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 1.6A
- Power - Peak Pulse:
- 300W
- 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-214AC (SMA)
SMAJ120CA-E3/5A FAQ
1.How can I place an order for SMAJ120CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120CA-E3/5A 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 SMAJ120CA-E3/5A reliable?
The price and inventory of SMAJ120CA-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ120CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ120CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120CA-E3/5A?
SMAJ120CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120CA-E3/5A 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 SMAJ120CA-E3/5A?
For technical support, including SMAJ120CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ120CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ120CA-E3/5A 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 SMAJ120CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ120CA-E3/5A?
All SMAJ120CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120CA-E3/5A, 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 SMAJ120CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ120CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ120CA-E3/5A Tags
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