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Vishay General Semiconductor - Diodes Division SMAJ14CA-E3/5A
- Part No.:
- SMAJ14CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14CA-E3/5A.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ14CA-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 signal or power lines. It features a 14 V standoff voltage (VWM), 15.6–17.2 V breakdown voltage (VBR) at 1 mA, 23.2 V maximum clamping voltage (VC) at 17.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial electronics.
For engineers reviewing the SMAJ14CA-E3/5A datasheet, SMAJ14CA-E3/5A pinout, SMAJ14CA-E3/5A application, or SMAJ14CA-E3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.66), AEC-Q101 qualification eligibility (via HE3/HM3 variants), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
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 concerns. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports consistent clamping under repetitive transient events.
The device complies with ANSI/IEEE C62.35 for surge suppression and meets UL 497B recognition (QVGQ2, E136766). Thermal performance is characterized by RθJA = 120 °C/W and RθJL = 30 °C/W, with rated operating junction temperature from –55 °C to +150 °C and derating above 25 °C ambient per Figure 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse working voltage before significant conduction begins; defines upper limit of normal operating range. |
| VBR (min/max) | 15.6 V / 17.2 V at IT = 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above VWM with margin. |
| VC @ IPPM | 23.2 V at 17.2 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform at TA = 25 °C; derates to 300 W above 78 V or elevated temperature. |
| IPPM | 17.2 A - Peak surge current corresponding to VC; defines transient energy absorption capacity under standard test condition. |
| Junction Temp Range | –55 °C to +150 °C - Specifies full operational and storage envelope; enables use in under-hood automotive or industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 0.208" length, 0.157" width, and 0.090" height; compatible with JEDEC MS-013. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, MSL Level 1 (peak reflow 260 °C), no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; conducts surge current equally in either direction during overvoltage event. |
| Cathode | Transient current exit (bidirectional) | Second terminal of symmetrical PN junction; completes low-impedance path to ground or return rail during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses (e.g., RS-485), or ungrounded circuits without polarity constraints. |
| 400 W peak pulse power | Handles high-energy transients such as ISO 7637-2 Pulse 1/2a/5a or IEC 61000-4-5 Combination Wave surges on 12 V systems. |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes voltage overshoot across protected ICs or MOSFETs, reducing risk of latch-up or gate oxide damage. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile usage without baking, simplifying manufacturing logistics. |
| Glass passivated junction | Provides stable VBR tolerance, low leakage (<1 μA), and long-term reliability under thermal cycling and humidity exposure. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Suppressing load dump and inductive switching spikes on 12 V battery-fed ECUs, lighting modules, and body control units. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and chassis ground to clamp transients up to ±100 V. Use Value: Limits voltage seen by downstream DC-DC converters and microcontrollers to ≤23.2 V, preventing reset or damage during ISO 16750-2 tests. |
Use Scenario: Protecting analog outputs (e.g., 4–20 mA current loops) and digital sensor interfaces (I²C, SPI) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS shunting transient energy away from precision amplifier inputs and MCU GPIO pins. Use Value: Maintains signal integrity with <1.0 μA leakage at 14 V, avoiding offset errors in 16-bit ADC front-ends. |
| Telecom Interface Surge Protection | Consumer Device USB Port Safeguarding |
|
Use Scenario: Guarding Ethernet PHYs, PoE injectors, and DSL line drivers against lightning-induced surges and induced noise. IC Role / Device Role / Timing Role: Bidirectional suppressor installed across differential pairs (e.g., TX+/TX–) to equalize clamping in both polarities. Use Value: Achieves <1 ns response time and <23.2 V clamping, meeting IEC 61000-4-5 Level 3 (2 kV/1 kA) requirements. |
Use Scenario: Shielding USB 2.0 data lines (D+/D–) and VBUS from human-body-model ESD (±8 kV contact) and system-level surges. IC Role / Device Role / Timing Role: Surface-mount TVS placed adjacent to connector to divert ESD current before reaching USB transceiver. Use Value: Delivers <10 pF junction capacitance (typ.) at VWM, preserving signal rise/fall times and eye diagram integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A-E3/5A | Unidirectional variant with cathode band marking; identical VWM, VBR, VC, and PPPM specs but asymmetric conduction. | Required where only positive-going transients occur or when integrated into polarity-sensitive circuits (e.g., DC power input). | Select SMAJ14A-E3/5A only if system grounding architecture mandates unidirectional clamping or if layout already accommodates cathode orientation. |
| SMBJ14CA-E3/52 | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; higher PPPM = 600 W, RθJA = 80 °C/W. | Better suited for higher-power or thermally constrained designs requiring extended surge endurance or lower thermal resistance. | Choose SMBJ14CA-E3/52 when PCB layout allows larger footprint and application demands >400 W single-pulse capability or improved thermal margin. |
Compared with SMAJ14A-E3/5A, the SMAJ14CA-E3/5A provides symmetrical protection essential for floating or AC-coupled nodes; versus SMBJ14CA-E3/52, it trades 200 W pulse power and 40 °C/W thermal resistance for 30% smaller board area and tighter placement flexibility.
Availability
SMAJ14CA-E3/5A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom infrastructure projects requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ14CA-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, TVS devices, and optoelectronics with emphasis on reliability, AEC-Q qualification, and high-volume manufacturability.
The SMAJ series was engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising signal fidelity or thermal performance.
FAQ
What is the clamping voltage of the SMAJ14CA-E3/5A under a 10/1000 μs surge?
The SMAJ14CA-E3/5A exhibits a maximum clamping voltage (VC) of 23.2 V when subjected to its rated peak pulse current of 17.2 A using the standardized 10/1000 μs waveform. This value is measured at TA = 25 °C on 0.2" × 0.2" copper pads and represents the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the SMAJ14CA-E3/5A suitable for automotive applications?
Yes, the SMAJ14CA-E3/5A is qualified for automotive use when ordered with HE3 or HM3 suffixes (e.g., SMAJ14CAHE3_A/I), which denote AEC-Q101 compliance. While the base SMAJ14CA-E3/5A is commercial-grade, its electrical characteristics - including –55 °C to +150 °C operating range, low leakage, and robust surge handling - align with automotive subsystem requirements; full qualification requires the designated automotive ordering code.
How does the bidirectional nature of SMAJ14CA-E3/5A affect its PCB layout?
The SMAJ14CA-E3/5A has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. Unlike unidirectional variants (e.g., SMAJ14A-E3/5A), it requires no cathode alignment check, simplifying automated assembly and enabling use across differential or floating nodes - such as RS-485 bus lines or transformer-coupled Ethernet interfaces - without redesigning trace routing.
What is the thermal resistance of SMAJ14CA-E3/5A, and how does it impact power dissipation?
The SMAJ14CA-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W. At 25 °C ambient, its steady-state power dissipation is limited to 3.3 W; however, this derates linearly above 25 °C per Figure 2 in the datasheet - meaning usable power drops to ~2.2 W at 75 °C ambient, directly influencing sustained surge repetition rate and thermal pad design.
Does SMAJ14CA-E3/5A meet industry standards for surge immunity testing?
Yes, the SMAJ14CA-E3/5A meets key industry standards including ANSI/IEEE C62.35 for transient suppressors and carries UL 497B recognition (file E136766) for protector classification. Its 400 W peak pulse rating with 10/1000 μs waveform supports compliance with IEC 61000-4-5 Level 3 (2 kV/1 kA) and ISO 7637-2 Pulse 1/2a/5a when applied with appropriate PCB layout - such as minimum 0.2" × 0.2" copper pads per terminal.
SMAJ14CA-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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 17.2A
- Power - Peak Pulse:
- 400W
- 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)
SMAJ14CA-E3/5A FAQ
1.How can I place an order for SMAJ14CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14CA-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 SMAJ14CA-E3/5A reliable?
The price and inventory of SMAJ14CA-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 SMAJ14CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ14CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14CA-E3/5A?
SMAJ14CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14CA-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 SMAJ14CA-E3/5A?
For technical support, including SMAJ14CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ14CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ14CA-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 SMAJ14CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ14CA-E3/5A?
All SMAJ14CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14CA-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 SMAJ14CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ14CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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