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Diodes Incorporated SMAJ17A-13
- Part No.:
- SMAJ17A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17A-13.pdf
- Description:
- TVS DIODE 17VWM 27.6VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,281
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Product details
Overview
SMAJ17A-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 17V reverse standoff voltage (VRWM), 18.9–20.9V breakdown voltage (VBR) at 1mA, 27.6V maximum clamping voltage (VC) at 14.5A peak pulse current (IPP), and operates from –55°C to +150°C.
For engineers reviewing the SMAJ17A-13 datasheet, SMAJ17A-13 pinout, SMAJ17A-13 application, or SMAJ17A-13 equivalent, key selection criteria include clamping performance under 8.3ms surge, unidirectional polarity handling, SMA package thermal limits, and compatibility with automated SMT assembly for industrial power supplies and automotive ECUs.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1ps) and stable clamping during transient events such as ESD, lightning-induced surges, and inductive switching spikes. Its unidirectional configuration provides forward conduction path during overvoltage while blocking reverse leakage below 5µA at VRWM.
The device is rated for 400W non-repetitive peak pulse power (PPK) with derating above 25°C ambient, supports 40A peak forward surge current (IFSM) per JEDEC Method, and maintains steady-state power dissipation of 1.0W at TL = 75°C - enabling reliable operation in compact, thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms half-sine surge without failure |
| Reverse Standoff Voltage | 17V - maximum continuous DC voltage before clamping initiates |
| Breakdown Voltage | 18.9–20.9V @ 1mA - precise VBR window ensures predictable turn-on threshold |
| Clamping Voltage | 27.6V @ 14.5A - limits downstream circuit voltage during worst-case surge |
| Peak Pulse Current | 14.5A - maximum transient current it can shunt while staying within VC limit |
| Operating Temperature | –55°C to +150°C - qualified for under-hood automotive and industrial environments |
| Package | SMA (DO-214AC) - standard SMT footprint compatible with IPC-7351B land pattern |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band marking for polarity identification. Dimensions: 4.00–4.60mm length × 2.29–2.92mm width × 1.27–1.63mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction | Connected to protected line side; conducts during negative transients in unidirectional mode |
| Cathode | Current exit / clamping reference node | Connected to ground or return path; defines clamping voltage relative to this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Ensures stable VBR and low leakage across temperature and life cycle |
| Fast response time | <1 ps - clamps before sensitive ICs experience overstress |
| RoHS-compliant finish | Matte tin plating - compatible with lead-free reflow profiles and halogen-free PCBs |
| High surge capability | 40A IFSM - withstands repetitive inrush or fault currents in power supply inputs |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 12V DC input rails against load dump and alternator transients. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC/DC converters and microcontrollers. Use Value: Limits voltage to ≤27.6V during 14.5A surge, preventing latch-up or gate oxide damage in downstream FETs and regulators. | Use Scenario: Safeguarding LIN bus interface and sensor supply lines in BCM subassemblies. IC Role / Device Role / Timing Role: Unidirectional TVS on 12V sensor VDD rail and LIN signal line (with series resistor). Use Value: Clamps ESD events per ISO 10605 (±30kV air) while maintaining <5µA leakage at 17V standby. |
| Telecom PoE Interface | Medical Diagnostic Equipment |
Use Scenario: Secondary overvoltage protection on 48V PoE power input after primary front-end filtering. IC Role / Device Role / Timing Role: Final-stage TVS on PSE-side DC feed before isolation transformer and DC/DC stage. Use Value: Absorbs residual surges from IEEE 802.3af/bt compliance testing without degrading insertion loss or capacitance. | Use Scenario: Protecting analog front-end inputs (ECG, EEG) from defibrillator-induced transients. IC Role / Device Role / Timing Role: Low-capacitance TVS on high-impedance sensor nodes connected to patient interfaces. Use Value: Delivers 27.6V clamping with minimal parasitic capacitance (<100pF), preserving signal integrity up to 1kHz bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17CA-13 | Bi-directional version; symmetric clamping for AC-coupled or bidirectional signal lines | Required where both positive and negative transients must be suppressed (e.g., RS-485, CAN) | Select only if system requires symmetrical clamping; otherwise unidirectional SMAJ17A-13 offers lower leakage and tighter VBR tolerance |
| SMBJ17A-13 | Same electrical specs but in larger SMB (DO-214AA) package; 600W PPK rating | Better thermal mass for higher average surge duty cycles or elevated ambient temperatures | Choose when board layout allows SMB footprint and thermal design requires >1.0W steady-state dissipation margin |
Compared with SMAJ17CA-13 and SMBJ17A-13, SMAJ17A-13 delivers optimal cost, size, and leakage performance for unidirectional DC rail protection where space and standby current are critical - especially in battery-powered or thermally dense modules.
Availability
SMAJ17A-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom PoE interfaces, and medical diagnostic equipment requiring stable component supply and full RoHS compliance.
Supply support for SMAJ17A-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 and manufacturing operations across Asia and the US.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for robust, high-reliability overvoltage protection in automotive, industrial, and communications systems operating under harsh EMC conditions.
FAQ
What is the polarity configuration of SMAJ17A-13?
SMAJ17A-13 is a unidirectional TVS diode, meaning it functions like a Zener diode in reverse bias and conducts only when the cathode is more positive than the anode by ≥18.9V. It has a visible cathode band marking and blocks current in the forward direction until ~3.5V, making it suitable for DC rail protection with defined ground reference.
Does SMAJ17A-13 meet AEC-Q200 requirements?
No - SMAJ17A-13 is not AEC-Q200 qualified. While its operating temperature range (–55°C to +150°C) meets automotive ambient requirements, Diodes Incorporated does not list this part in its AEC-Q200 stress-tested product catalog. For automotive-grade qualification, consider the automotive-specific P4SMAJ17A or SMAJ17A-Q variants.
Can SMAJ17A-13 be used in parallel for higher surge current handling?
Not recommended without derating and matching. Parallel connection introduces imbalance due to VBR tolerances (±5.5%) and thermal coupling differences. Even matched units may share current unevenly under fast transients, risking premature failure of one device. Use a single higher-rated device like SMBJ17A-13 instead.
What is the typical junction capacitance of SMAJ17A-13 at 0V?
Typical junction capacitance is 100pF at 0V reverse bias, measured at 1MHz. This value increases slightly with decreasing VR and is consistent with the unidirectional SMAJ family's published curves. It remains low enough for use on 12V/24V power rails but is unsuitable for high-speed data lines (>10Mbps) without additional filtering.
SMAJ17A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 14.5A
- 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)
SMAJ17A-13 FAQ
1.How can I place an order for SMAJ17A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17A-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 SMAJ17A-13 reliable?
The price and inventory of SMAJ17A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ17A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17A-13?
SMAJ17A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17A-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 SMAJ17A-13?
For technical support, including SMAJ17A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17A-13 requirements.
6.How does Aetrix verify that SMAJ17A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ17A-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 SMAJ17A-13 meets industry standards.
7.What is the process for return or replacement of SMAJ17A-13?
All SMAJ17A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17A-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 SMAJ17A-13 part is unused and in its original packaging.
Return procedure for SMAJ17A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ17A-13 Tags
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