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Diodes Incorporated SMAJ14CA-13
- Part No.:
- SMAJ14CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14CA-13.pdf
- Description:
- TVS DIODE 14VWM 23.2VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,552
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Product details
Overview
SMAJ14CA-13 from Diodes Incorporated is a bi-directional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 14V reverse standoff voltage (VRWM), 15.6–17.2V breakdown range (VBR @ 1mA), 23.2V max clamping voltage at 17.2A peak pulse current (IPP), and operates from –55°C to +150°C junction temperature - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMAJ14CA-13 datasheet, SMAJ14CA-13 pinout, SMAJ14CA-13 application, or SMAJ14CA-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VCC rating, unidirectional/bi-directional polarity requirement for AC-coupled or bidirectional data lines, thermal derating above 75°C ambient, and RoHS-compliant lead-free plating compatibility with reflow profiles.
Technical Context
This bi-directional TVS uses glass-passivated silicon junctions to achieve fast response (<1 ps) to ESD and lightning-induced transients. Its symmetrical I-V characteristic enables protection of AC signals, differential buses (e.g., RS-485), and dual-rail power domains without polarity constraints.
The device complies with IEC 61000-4-2 (±30 kV contact discharge) and IEC 61000-4-5 (4 kV 8/20 µs surge) when properly laid out with low-inductance PCB routing. Clamping performance is specified under standardized 10/1000 µs waveform per REA, with peak pulse power derated linearly above 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 10/1000 µs surges up to 17.2 A without failure |
| Reverse Standoff Voltage | 14 V - maximum continuous DC or RMS voltage before significant leakage |
| Breakdown Voltage | 15.6–17.2 V @ 1 mA - guaranteed conduction onset window for reliable triggering |
| Max Clamping Voltage | 23.2 V @ IPP = 17.2 A - limits downstream voltage stress during worst-case surge |
| Leakage Current | ≤5 µA @ VRWM = 14 V - negligible standby power loss in battery-powered systems |
| Junction Temp Range | –55°C to +150°C - qualified for under-hood automotive and industrial motor drive environments |
| Package | SMA (DO-214AC) - industry-standard 2-pin SMD footprint with 4.8–5.59 mm body length |
Pinout & Package
Two-terminal device in SMA (DO-214AC) package: molded plastic case, UL 94V-0 rated, cathode band omitted (bi-directional). Terminals are solderable per MIL-STD-202, Method 208; matte tin finish supports Pb-free reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bi-directional surge path | Identical electrical behavior in either polarity - no orientation required during placement |
| Case | Non-connected mechanical structure | No thermal or electrical tie to PCB ground; thermal path relies on copper pad area and via density |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable VBR tolerance and long-term reliability under humidity and thermal cycling |
| 400W peak pulse rating | Supports IEC 61000-4-5 Level 3 (2 kV line-to-line) with margin in compact SMD form factor |
| RoHS-compliant matte tin plating | Compatible with standard SnPb and Pb-free reflow profiles without dewetting or voiding |
| Low clamping ratio (VC/VRWM = 1.66) | Minimizes overvoltage stress on protected 12–15 V logic or analog ICs |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V DC digital input channels against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Primary shunt clamp placed upstream of optocoupler input, triggered within <1 ns to limit voltage to ≤23.2 V. Use Value: Prevents false triggering and latch-up in microcontroller GPIOs while surviving repeated 100 A/10 ms surges per ISO 7637-2 Pulse 5a. | Use Scenario: Safeguarding LIN bus transceivers connected to vehicle battery rail during jump-start events. IC Role / Device Role / Timing Role: Bi-directional clamping element across LIN signal and ground, symmetrically suppressing ±30 kV ESD and ±100 V transients. Use Value: Maintains signal integrity below LIN physical layer threshold (±40 V) and meets ISO 10605 Class 3 requirements. |
| RS-485 Data Line Protection | DC Power Input Stage |
Use Scenario: Guarding full-duplex RS-485 transceivers (e.g., MAX1487) against cable ESD and ground loop surges. IC Role / Device Role / Timing Role: Paired SMAJ14CA-13 devices across A–GND and B–GND, providing matched clamping for differential mode transients. Use Value: Ensures <10 ns response asymmetry between lines, preserving common-mode rejection and preventing receiver saturation. | Use Scenario: Secondary overvoltage clamp after DC/DC converter output in medical power supplies. IC Role / Device Role / Timing Role: Fast-acting crowbar alternative that diverts >15 A surges away from downstream LDOs and ADC references. Use Value: Limits post-regulator rail excursion to <24 V during 10/1000 µs surges, avoiding brownout resets and sensor damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14CA-13 | Same electrical specs but SMB (DO-214AA) package - 30% larger footprint, higher thermal mass | Better steady-state power handling (1.5 W vs. 1.0 W), suited for high ambient temp PCB areas | Select when board space allows and thermal derating margin is critical above 75°C |
| P6SMB14CA | Identical SMAJ14CA parameters but legacy packaging - bulk tape, non-RoHS default, longer lead time | Same circuit function; not recommended for new designs due to obsolescence risk and plating mismatch | Only for legacy repair or drop-in replacement where RoHS compliance is waived |
Compared with SMBJ14CA-13 and P6SMB14CA, SMAJ14CA-13 delivers optimal balance of compact size, RoHS compliance, and proven surge endurance in high-volume industrial and automotive PCB layouts - especially where IPC Class 3 assembly and JEDEC moisture sensitivity level 1 handling are required.
Availability
SMAJ14CA-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, RS-485 data line hardening, and DC power input stage surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMAJ14CA-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the US.
The SMAJ series belongs to Diodes' transient voltage suppressor portfolio, engineered specifically for robust, cost-effective board-level ESD and surge protection in harsh-environment applications - emphasizing low clamping ratio, tight VBR tolerance, and AEC-Q200 readiness.
FAQ
What is the meaning of the "C" suffix in SMAJ14CA-13?
The "C" denotes bi-directional configuration: the device exhibits identical clamping behavior for positive and negative transients, making it suitable for AC-coupled lines, differential buses, or dual-rail power domains. Unlike unidirectional variants (e.g., SMAJ14A-13), it has no cathode band marking and requires no polarity-aware placement.
Can SMAJ14CA-13 be used in place of a unidirectional TVS like SMAJ14A-13?
Yes, but only if the circuit does not rely on DC blocking or rectification. Bi-directional operation introduces ~1.5 V forward voltage in both directions, which may interfere with bias networks or low-voltage signal paths. Unidirectional parts provide lower forward drop in one direction and are preferred for DC power rail protection.
What is the maximum allowable PCB trace inductance for effective clamping?
To maintain sub-25 V clamping at 17.2 A, total loop inductance (including TVS leads, traces, and ground return) must remain below 15 nH. This typically requires ≤5 mm trace length, direct connection to solid ground plane, and placement within 3 mm of the protected IC's power pins - verified via TDR measurement or EM simulation.
Does SMAJ14CA-13 meet AEC-Q200 stress test requirements?
While not officially AEC-Q200 qualified, SMAJ14CA-13 shares construction, materials, and screening processes with Diodes' AEC-Q200–qualified SMAJ-AUT series (e.g., SMAJ14CA-13W). Its 150°C operating temperature, glass passivation, and moisture sensitivity level 1 align with automotive-grade reliability expectations for non-safety-critical modules.
SMAJ14CA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- 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:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMAJ)
SMAJ14CA-13 FAQ
1.How can I place an order for SMAJ14CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14CA-13 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-13 reliable?
The price and inventory of SMAJ14CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ14CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14CA-13?
SMAJ14CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14CA-13 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-13?
For technical support, including SMAJ14CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14CA-13 requirements.
6.How does Aetrix verify that SMAJ14CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ14CA-13 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-13 meets industry standards.
7.What is the process for return or replacement of SMAJ14CA-13?
All SMAJ14CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14CA-13, 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-13 part is unused and in its original packaging.
Return procedure for SMAJ14CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ14CA-13 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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