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Diodes Incorporated SMAJ22A-13-F
- Part No.:
- SMAJ22A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22A-13-F.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:123,920
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Product details
Overview
SMAJ22A-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 22V reverse standoff voltage (VRWM), 24.4–26.9V breakdown range (VBR @ 1mA), 35.5V max clamping voltage at 11.2A peak pulse current (IPP), and SMA package with cathode band polarity marking.
For engineers reviewing the SMAJ22A-13-F datasheet, SMAJ22A-13-F pinout, SMAJ22A-13-F application, or SMAJ22A-13-F equivalent, key selection criteria include clamping performance under 8.3ms surge, unidirectional polarity for DC rail protection, RoHS-compliant lead-free plating, and compatibility with automated SMT assembly on industrial and automotive PCBs.
Technical Context
This TVS diode operates as a fast-acting shunt protector, triggering when transient voltage exceeds its breakdown threshold and clamping to ≤35.5V while diverting up to 11.2A (8.3ms half-sine). Its glass-passivated junction ensures stable VBR and low leakage (<5µA @ 22V).
Thermally rated for -55°C to +150°C operation and 1.0W steady-state dissipation at TL = +75°C, it supports high-reliability applications where ambient temperature cycling and long-term stability are critical-especially in automotive body electronics and industrial I/O modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms transients without failure per REA 10×1000 waveform |
| Reverse Standoff Voltage | 22V - maximum continuous DC voltage before significant leakage; sets operating margin below clamping |
| Breakdown Voltage | 24.4–26.9V @ 1mA - precise VBR window ensures consistent turn-on across production lots |
| Clamping Voltage | 35.5V @ 11.2A IPP - limits downstream IC voltage stress during surge events |
| Leakage Current | <5µA @ 22V - negligible standby power loss and minimal impact on high-impedance sensing nodes |
| Package | SMA (DO-214AC) - industry-standard 2-pin SMT outline with 4.0–4.6mm body width and 2.29–2.92mm height |
| Operating Temp | -55°C to +150°C - qualified for under-hood automotive and industrial control cabinet environments |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band indicating pin 1 (anode is pin 2). Weight: 0.064g. Moisture sensitivity level: J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Current return path during clamping | Connected to ground or low-impedance return plane; must handle full IPP surge current |
| Cathode (Pin 1, marked) | Protected line input | Connected to supply rail or signal line; clamps to anode when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4kV/2Ω) on 24V systems |
| Glass-passivated die | Ensures stable VBR over temperature and lifetime; eliminates passivation-related drift or leakage increase |
| Lead-free, RoHS 3 compliant | Meets global environmental regulations and supports Pb-free reflow profiles (JEDEC J-STD-020) |
| Fast response time (<1ps) | Clamps before sensitive downstream components (e.g., MCU I/O, CAN transceivers) experience overvoltage damage |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes protected node voltage excursion relative to breakdown-critical for 3.3V/5V logic interface safety margins |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: 24V DC input terminals on programmable logic controller digital input cards exposed to inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input line and chassis ground to clamp EFT bursts and relay coil flyback. Use Value: Limits voltage to ≤35.5V during 11.2A surges, protecting 24V-rated optocouplers and level-shifting circuitry without derating. |
Use Scenario: LIN bus or sensor supply lines in door module ECUs subject to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V/24V auxiliary rails feeding microcontrollers and Hall-effect sensors. Use Value: Withstands 40A surge for 8.3ms (derated) and maintains <5µA leakage at 22V, preserving battery drain budgets. |
| DC Power Supply Input Stage | RS-485 Transceiver Interface |
|
Use Scenario: Front-end protection of AC/DC or DC/DC converter inputs handling 24V nominal industrial supplies. IC Role / Device Role / Timing Role: First-line shunt device absorbing repetitive surges from motor drives or grid fluctuations. Use Value: 400W rating and 150°C TJ capability allow sustained operation in enclosed enclosures with limited airflow. |
Use Scenario: Common-mode transient suppression on RS-485 A/B differential pairs in factory automation networks. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices (one per line to ground) limiting common-mode spikes. Use Value: Low capacitance (~25pF at 0V) avoids signal integrity degradation at 10Mbps data rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/5A (Vishay) | Same VRWM (22V), slightly higher VC (36.0V @ 11.2A); identical SMA package and RoHS compliance | Valid for same 24V rail protection but requires verification of 0.5V higher clamping margin in safety-critical designs | Select if dual-sourcing required and system tolerates +0.5V clamping rise; verify thermal layout matches Vishay's derating curve |
| 1.5SMC22A (ON Semiconductor) | Higher PPK (1500W), larger SMC package (DO-214AB); VRWM = 22V, VC = 36.0V @ 41.7A | Not drop-in: requires PCB footprint change; suited for higher-energy threats where space permits | Choose only when surge energy exceeds 400W capability-e.g., direct lightning-induced surges in outdoor equipment |
Compared with SMAJ22A-13-F, the Vishay alternative offers near-identical electrical behavior in the same footprint, while the ON Semiconductor part trades size for significantly higher surge capacity-making it unsuitable for space-constrained 24V I/O protection unless energy requirements justify the SMC footprint.
Availability
SMAJ22A-13-F is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and DC power supply input stages requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ22A-13-F 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and product qualification to AEC-Q101 for automotive-grade discretes.
The SMAJ series is engineered specifically for high-reliability transient suppression in harsh environments-targeting industrial automation, automotive subsystems, and telecom infrastructure where robustness and consistency are non-negotiable.
FAQ
What is the maximum clamping voltage of SMAJ22A-13-F at its rated peak pulse current?
The maximum clamping voltage (VC) is 35.5V measured at 11.2A peak pulse current (IPP), using the standard 8.3ms half-sine waveform per REA. This value is guaranteed across the full operating temperature range (-55°C to +150°C) and defines the upper voltage limit imposed on protected circuits during surge events.
Is SMAJ22A-13-F suitable for bidirectional signal line protection?
No-SMAJ22A-13-F is unidirectional only, indicated by the absence of "C" in its part number. For bidirectional protection (e.g., USB, RS-232), use SMAJ22CA-13-F, which has symmetrical clamping in both directions and no cathode band marking.
Does SMAJ22A-13-F require derating at elevated ambient temperatures?
Yes-its peak pulse power must be linearly derated above +25°C ambient, following the curve in Figure 1 of DS19005. At +85°C, maximum PPK drops to ~280W; at +125°C, it falls to ~160W. Steady-state power must also be derated per Figure 6, down to 0.5W at TL = +125°C.
Can SMAJ22A-13-F be used in automotive applications requiring AEC-Q101 qualification?
No-the standard SMAJ22A-13-F is not AEC-Q101 qualified. Diodes offers the automotive-grade variant SMAJ22AQ-13-F, which undergoes additional stress testing, PPAP documentation, and is manufactured in IATF 16949-certified facilities. Use only the "Q" suffix version for automotive production.
SMAJ22A-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 11.2A
- 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:
- SMA
SMAJ22A-13-F FAQ
1.How can I place an order for SMAJ22A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22A-13-F 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 SMAJ22A-13-F reliable?
The price and inventory of SMAJ22A-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ22A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22A-13-F?
SMAJ22A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22A-13-F 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 SMAJ22A-13-F?
For technical support, including SMAJ22A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22A-13-F requirements.
6.How does Aetrix verify that SMAJ22A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ22A-13-F 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 SMAJ22A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ22A-13-F?
All SMAJ22A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22A-13-F, 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 SMAJ22A-13-F part is unused and in its original packaging.
Return procedure for SMAJ22A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22A-13-F Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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