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Diodes Incorporated SMAJ22A-13
- Part No.:
- SMAJ22A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22A-13.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:9,344
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Product details
Overview
SMAJ22A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 22V reverse standoff voltage (VRWM), 24.4–26.9V breakdown voltage (VBR) at 1mA, 35.5V maximum clamping voltage (VC) at 11.2A peak pulse current (IPP), and operates from –55°C to +150°C.
For engineers reviewing the SMAJ22A-13 datasheet, SMAJ22A-13 pinout, SMAJ22A-13 application, or SMAJ22A-13 equivalent, key selection criteria include clamping performance under 8.3ms surge pulses, unidirectional polarity for DC-biased circuits, RoHS-compliant SMA package compatibility with automated SMT assembly, and thermal derating above 25°C ambient.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1ps) and low dynamic impedance during ESD or lightning-induced transients. Its unidirectional configuration provides asymmetric clamping-low forward voltage (~3.5V at 35A) during reverse surge events while blocking normal forward bias operation.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) immunity standards when applied with proper PCB layout and series impedance. Clamping behavior is characterized using a 10/1000μs waveform per REA, with peak power limited to 400W for non-repetitive pulses at TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms half-sine surges without failure under defined thermal conditions |
| Reverse Standoff Voltage | 22V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage | 24.4–26.9V @ 1mA - precise VBR window ensures reliable turn-on margin above VRWM |
| Clamping Voltage | 35.5V @ 11.2A IPP - limits downstream voltage stress during worst-case surge events |
| Leakage Current | ≤5.0μA @ 22V - negligible standby power loss in battery-powered or low-power systems |
| Operating Temperature | –55°C to +150°C - supports automotive under-hood, industrial control, and outdoor equipment deployment |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band polarity indicator, and matte tin lead finish compliant with RoHS and JEDEC J-STD-020C Level 1 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction | Connected to protected circuit ground or low-side return path in unidirectional clamp configuration |
| Cathode | Current exit during reverse-biased clamping | Connected to protected line (e.g., 24V rail); cathode band marks this terminal on package |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| 400W peak pulse power rating | Provides robust protection against IEC 61000-4-5 Level 4 (4kV) surges on 50Ω source impedance lines |
| Fast response time | Sub-nanosecond turn-on ensures clamping occurs before sensitive ICs experience overvoltage damage |
| RoHS-compliant matte tin plating | Supports lead-free reflow soldering (peak 260°C) without whisker formation or intermetallic degradation |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24V DC input channels on programmable logic controller backplanes exposed to inductive kickback and field wiring faults. IC Role / Device Role / Timing Role: Primary shunt-type overvoltage protector placed directly at connector entry point before signal conditioning circuitry. Use Value: Limits transient voltage to ≤35.5V during 11.2A surges, preventing latch-up or gate oxide rupture in downstream op-amps and microcontrollers. | Use Scenario: LIN bus or sensor supply lines in body electronics subject to load dump and ISO 7637-2 pulse 1/2/5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp negative-going transients and absorb positive spikes up to 400W. Use Value: Maintains <5μA leakage at 22V, avoiding battery drain in always-on modules while surviving 150°C junction temperature during engine-off storage. |
| Telecom Power Feeds | Medical Equipment DC Rails |
Use Scenario: -48V DC power distribution in telecom cabinets where hot-swap events and lightning-induced surges occur. IC Role / Device Role / Timing Role: Reverse-polarity TVS mounted on feed line to protect DC-DC converters and monitoring ICs from reverse-energy transients. Use Value: Withstands 40A single-half-sine forward surge (IFSM), enabling survival of high-current fault conditions without bond wire fusing. | Use Scenario: Isolated 12V/24V auxiliary supplies in diagnostic imaging devices requiring low EMI and zero leakage-induced measurement offset. IC Role / Device Role / Timing Role: Secondary-level TVS on isolated secondary side, selected for tight VBR tolerance to avoid false triggering near nominal rail voltage. Use Value: 24.4–26.9V VBR range ensures clamping initiates only during genuine overvoltage events-not during normal 24V ±5% regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A | Same electrical specs but SMB (DO-214AA) package - 5.3mm width vs. SMA's 4.3mm; 600W PPK rating | Higher power handling suits higher-energy surge environments; larger footprint may limit dense PCB layouts | Select when system-level surge testing exceeds 400W or board space allows wider package |
| SAC22 | 600W rating, same SMA package, but tighter VBR tolerance (24.5–26.5V) and lower VC (34.0V @ 11.8A) | Optimized for precision clamping in noise-sensitive analog front-ends; slightly higher cost | Prefer for medical or test equipment where sub-volt clamping margin is critical |
Compared with SMBJ22A and SAC22, SMAJ22A-13 offers optimal balance of compact size, proven 400W surge capability, and cost-effective qualification for industrial and automotive Tier-2 applications-without over-specifying power or tolerance where not required.
Availability
SMAJ22A-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom power feeds, and medical equipment DC rails requiring stable component supply across multi-year production cycles.
Supply support for SMAJ22A-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, manufacturing, and sales operations across Asia, Europe, and North America.
The SMAJ series belongs to Diodes' transient voltage suppressor product line, engineered specifically for high-reliability, surface-mount overvoltage protection in harsh-environment applications including automotive, industrial automation, and communications infrastructure.
FAQ
What is the polarity configuration of SMAJ22A-13?
SMAJ22A-13 is a unidirectional TVS diode, meaning it functions as a Zener-like clamp in reverse bias and conducts like a standard diode in forward bias. It features a cathode band marking on the SMA package body, and must be oriented with cathode toward the protected line and anode to ground for proper surge clamping.
Does SMAJ22A-13 meet automotive AEC-Q200 requirements?
No-SMAJ22A-13 is not AEC-Q200 qualified. While it operates from –55°C to +150°C and is used in automotive body electronics, Diodes Incorporated does not list this specific part number in its AEC-Q200-qualified portfolio. For AEC-Q200-compliant alternatives, consider the AEC-qualified P4SMAJ22A or SMAJ22AE3 series.
How does the 400W rating translate to real-world surge immunity?
The 400W rating corresponds to a peak pulse current of 11.2A at 35.5V clamping voltage under a standardized 8.3ms half-sine waveform. In practice, this enables protection against IEC 61000-4-5 Level 4 (4kV, 2Ω source) surges on 24V systems when combined with appropriate series impedance (e.g., 10Ω resistor or ferrite bead).
Can SMAJ22A-13 replace SMAJ22CA in a circuit?
No-SMAJ22A-13 is unidirectional, while SMAJ22CA is bi-directional. Substituting them requires verifying circuit polarity: SMAJ22CA clamps both positive and negative transients and lacks a cathode band, making it suitable for AC-coupled or floating signal lines. Using SMAJ22A-13 in its place risks failure during negative surges.
SMAJ22A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 11.3A
- 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)
SMAJ22A-13 FAQ
1.How can I place an order for SMAJ22A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22A-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 SMAJ22A-13 reliable?
The price and inventory of SMAJ22A-13 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 is usually 5 days.
3.What payment methods are accepted for SMAJ22A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22A-13?
SMAJ22A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22A-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 SMAJ22A-13?
For technical support, including SMAJ22A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22A-13 requirements.
6.How does Aetrix verify that SMAJ22A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ22A-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 SMAJ22A-13 meets industry standards.
7.What is the process for return or replacement of SMAJ22A-13?
All SMAJ22A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22A-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 SMAJ22A-13 part is unused and in its original packaging.
Return procedure for SMAJ22A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22A-13 Tags
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Diodes Incorporated
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