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Diodes Incorporated SMAJ22CA-13
- Part No.:
- SMAJ22CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CA-13.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:8,512
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Product details
Overview
SMAJ22CA-13 from Diodes Incorporated is a 400W bi-directional transient voltage suppressor (TVS) diode in SMA package, designed for clamping ESD and surge transients on data lines and power rails. It features a 22V reverse standoff voltage (VRWM), 24.4–26.9V breakdown voltage (VBR) at 1mA, 35.5V max clamping voltage (VC) at 11.2A peak pulse current (IPP), and operates from –55°C to +150°C.
For engineers reviewing the SMAJ22CA-13 datasheet, SMAJ22CA-13 pinout, SMAJ22CA-13 application, or SMAJ22CA-13 equivalent, key selection criteria include clamping voltage margin relative to system operating voltage, bidirectional surge handling for AC-coupled or floating interfaces, JEDEC-compliant 8.3ms surge rating, and RoHS-compliant lead-free plating compatibility with automated SMT assembly.
Technical Context
This bi-directional TVS diode functions as a voltage-clamped shunt protector-triggering conduction when transient voltage exceeds its breakdown threshold and diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<5µA at VRWM).
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) immunity standards when applied per layout guidelines. Its 400W peak pulse power rating is derated linearly above 25°C ambient, maintaining reliable protection across industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms half-sine surges up to 11.2A without failure |
| Reverse Standoff Voltage | 22V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage | 24.4–26.9V @ 1mA - precise triggering range ensures early clamping without false trips |
| Max Clamping Voltage | 35.5V @ 11.2A - limits voltage seen by protected ICs to safe levels during surge events |
| Leakage Current | <5µA @ 22V - negligible standby power loss and signal integrity impact |
| Operating Temperature | –55°C to +150°C - supports under-hood automotive, industrial motor drives, and outdoor equipment |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.59mm body length and 2.30mm terminal spacing |
Pinout & Package
SMAJ22CA-13 uses the standard SMA (DO-214AC) package: molded plastic case rated UL 94V-0, cathode band omitted due to bi-directional construction, and matte tin-plated terminals compliant with MIL-STD-202 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge path | No polarity marking; either terminal serves as input or return depending on transient polarity |
| Case | Non-connected mechanical structure | Plastic body provides electrical isolation and thermal mass for pulse energy dissipation |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Rating | Enables robust protection against IEC 61000-4-4 EFT bursts and lightning-induced surges on 24V industrial buses |
| Glass-Passivated Junction | Ensures tight VBR tolerance (±5%) and long-term stability under thermal cycling and humidity stress |
| Bi-directional Configuration | Protects AC-coupled interfaces (e.g., RS-485, CAN FD, audio lines) without requiring external polarity alignment |
| RoHS-Compliant Matte Tin Finish | Supports lead-free reflow profiles (up to 260°C) and eliminates post-solder cleaning for high-reliability assemblies |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24V digital input channels exposed to load dump and inductive kickback in factory automation cabinets. IC Role / Device Role / Timing Role: Shunt-type transient clamp placed between signal line and ground, responding within <1ps to limit voltage excursion. Use Value: Prevents latch-up or permanent damage to microcontroller GPIOs and optocoupler inputs during 100A/10ms load dump events. | Use Scenario: LIN bus transceivers and sensor supply lines subjected to battery reversal and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional voltage limiter across power rail and communication line, symmetrically suppressing ±100V transients. Use Value: Maintains functional safety compliance (ISO 16750-2) without adding series impedance or signal distortion on low-speed control networks. |
| RS-485 Communication Port | Smart Energy Meter Interface |
Use Scenario: Differential data lines in utility-grade meters connected to long cable runs vulnerable to induced lightning surges. IC Role / Device Role / Timing Role: Common-mode and differential-mode surge suppressor mounted at connector entry point, paired with GDT or MOV for staged protection. Use Value: Limits clamped voltage to ≤35.5V, ensuring transceiver survival under 4kV EFT and 10kV contact ESD per IEC 61000-4-5. | Use Scenario: M-Bus and optical port interfaces in electricity/water meters deployed in outdoor substations. IC Role / Device Role / Timing Role: Primary overvoltage guard on isolated power and data paths, operating continuously at 85°C ambient with no derating loss. Use Value: Achieves >10-year field reliability with zero degradation in clamping performance under thermal-humidity cycling (85°C/85% RH). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22CA-13 | 600W peak power, larger SMB package (6.2mm x 3.6mm vs SMA's 4.6mm x 2.9mm) | Better suited for higher-energy surges; requires more PCB area and has ~15% higher junction capacitance | Select when surge threat level exceeds 400W or when board layout allows larger footprint |
| SMCJ22CA-13 | 1500W peak power, SMC package (7.1mm x 6.2mm), higher thermal mass | Used in primary-level protection (e.g., front-end AC/DC inputs); not suitable for space-constrained signal lines | Choose for first-stage clamping ahead of secondary protectors like SMAJ22CA-13 |
Compared with SMBJ22CA-13 and SMCJ22CA-13, SMAJ22CA-13 delivers optimal balance of surge capacity, compact size, and low parasitic capacitance for secondary-level protection on dense PCBs where routing density and signal integrity are critical.
Availability
SMAJ22CA-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and RS-485 communication ports requiring stable component supply across extended product lifecycles.
Supply support for SMAJ22CA-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 U.S.
The SMAJ series belongs to Diodes' transient suppression portfolio, engineered specifically for high-reliability, surface-mount surge protection in harsh environments-emphasizing tight VBR control, low clamping ratio, and AEC-Q200 readiness for automotive use.
FAQ
What does the "C" in SMAJ22CA-13 signify?
The "C" suffix indicates bi-directional configuration, meaning the device clamps transients of either polarity symmetrically across its terminals. Unlike unidirectional variants (e.g., SMAJ22A-13), it lacks a cathode band and is used where signal lines float or carry AC signals-such as RS-485, CAN, or audio interfaces-without requiring polarity-aware placement.
Is SMAJ22CA-13 compatible with lead-free reflow processes?
Yes-SMAJ22CA-13 features matte tin plating qualified for Pb-free soldering per J-STD-020C, supporting peak reflow temperatures up to 260°C. Its UL 94V-0 mold compound remains stable during standard SAC305 profile ramp rates, and moisture sensitivity level is rated Level 1, eliminating bake requirements prior to assembly.
How does SMAJ22CA-13 differ from SMAJ22A-13?
SMAJ22CA-13 is bi-directional with symmetrical clamping behavior and no polarity marking; SMAJ22A-13 is unidirectional, featuring a cathode band and conducting only during reverse-biased transients. The unidirectional version exhibits lower leakage (<1µA) at VRWM but cannot protect AC-coupled lines without additional design considerations such as back-to-back pairing.
Can SMAJ22CA-13 be used for IEC 61000-4-5 surge protection?
Yes-when applied with appropriate series impedance (e.g., 2Ω–10Ω current-limiting resistor) and layout (short traces, ground plane coupling), SMAJ22CA-13 meets IEC 61000-4-5 Level 3 (2kV line-earth, 1kV line-line) requirements. Its 35.5V clamping voltage at 11.2A ensures protected ICs remain below absolute maximum ratings during 8/20µs surge waveforms.
SMAJ22CA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 11.3A
- 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)
SMAJ22CA-13 FAQ
1.How can I place an order for SMAJ22CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CA-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 SMAJ22CA-13 reliable?
The price and inventory of SMAJ22CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ22CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CA-13?
SMAJ22CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CA-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 SMAJ22CA-13?
For technical support, including SMAJ22CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CA-13 requirements.
6.How does Aetrix verify that SMAJ22CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ22CA-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 SMAJ22CA-13 meets industry standards.
7.What is the process for return or replacement of SMAJ22CA-13?
All SMAJ22CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CA-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 SMAJ22CA-13 part is unused and in its original packaging.
Return procedure for SMAJ22CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22CA-13 Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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