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Diodes Incorporated SMAJ7.5A-13
- Part No.:
- SMAJ7.5A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5A-13.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,098
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Product details
Overview
SMAJ7.5A-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 7.5V reverse standoff voltage, 8.33–9.21V breakdown voltage at 1.0mA test current, 12.9V max clamping voltage at 31.0A peak pulse current, and operates from –55°C to +150°C junction temperature.
For engineers reviewing the SMAJ7.5A-13 datasheet, SMAJ7.5A-13 pinout, SMAJ7.5A-13 application, or SMAJ7.5A-13 equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, peak pulse current capability under IEC 61000-4-5 surge conditions, thermal derating at elevated ambient temperatures, and compatibility with automated SMT assembly using SMA package footprint.
Technical Context
This TVS diode uses glass-passivated silicon junction technology to achieve fast response time (<1 ps) and stable clamping performance under repetitive transient stress. Its unidirectional configuration provides low-leakage forward conduction path while blocking reverse voltage up to 7.5V until breakdown.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) immunity standards when applied with proper PCB layout and series impedance. Clamping behavior is characterized using 8.3ms half-sine waveform per JEDEC JESD282B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3ms surge events without failure under defined thermal conditions |
| Reverse Standoff Voltage | 7.5 V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage | 8.33–9.21 V @ 1.0 mA - guaranteed conduction onset range for reliable overvoltage triggering |
| Max Clamping Voltage | 12.9 V @ 31.0 A - upper limit of voltage seen by protected circuit during worst-case surge |
| Peak Pulse Current | 31.0 A - maximum non-repetitive surge current the device can safely divert |
| Operating Temperature | –55°C to +150°C - supports automotive under-hood, industrial control, and telecom infrastructure use |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 2.01–2.30 mm terminal width |
Pinout & Package
Two-terminal SMA (DO-214AC) package with cathode band marking on the case. Terminals are anode (unmarked end) and cathode (banded end); polarity must be observed for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Protected Line Side | Connected to line being protected; conducts to ground during overvoltage event |
| Cathode | Ground Reference Terminal | Connected to system ground or low-impedance return path; defines clamping reference |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables robust protection against IEC 61000-4-5 Level 3 (1kV/2Ω) surges on 12V/24V systems |
| Glass-Passivated Die | Ensures stable electrical parameters and long-term reliability under thermal cycling and humidity |
| RoHS-Compliant Matte Tin Finish | Supports lead-free reflow soldering (J-STD-020C Level 1) without whisker risk |
| UL 94V-0 Molded Case | Provides flame-retardant housing suitable for safety-critical industrial and automotive applications |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 12V supply rail from load dump and alternator transients in BCM microcontroller power domain. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of LDO regulator input to limit voltage excursion below 13V. Use Value: Prevents brown-out reset or latch-up of MCU by limiting transient overvoltage to ≤12.9V at 31A surge current. | Use Scenario: Shields 24V digital input optocoupler interface from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Fast-acting shunt protector between input terminal and ground, triggered within <1 ps of overvoltage onset. Use Value: Maintains signal integrity by clamping transients before they exceed optocoupler CTR degradation threshold. |
| Telecom PoE Midspan Injector | Medical Patient Monitor Front-End Sensor Interface |
Use Scenario: Guards 48V DC power feed lines in IEEE 802.3af/at midspan injectors against lightning-induced surges. IC Role / Device Role / Timing Role: First-stage overvoltage clamp on PSE output, coordinated with secondary MOV and current-limiting fuse. Use Value: Limits clamped voltage to 12.9V, ensuring downstream DC-DC controller remains within absolute maximum ratings. | Use Scenario: Safeguards low-voltage analog sensor inputs (e.g., ECG leads) from ESD discharge during patient contact. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) unidirectional TVS placed directly at connector entry point. Use Value: Provides sub-13V clamping with <100 nA leakage at 7.5V, preserving signal-to-noise ratio in µV-level measurements. |
Availability
SMAJ7.5A-13 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, telecom power-over-Ethernet injectors, and medical sensor front-end protection requiring stable component supply across multi-year production cycles.
Supply support for SMAJ7.5A-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, specializing in high-reliability protection, power management, and signal integrity solutions for industrial, automotive, and computing markets.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-energy surge immunity in harsh-environment DC power and interface protection applications.
FAQ
What is the difference between SMAJ7.5A-13 and SMAJ7.5CA-13?
SMAJ7.5A-13 is unidirectional with cathode band marking and conducts only in reverse breakdown; SMAJ7.5CA-13 is bidirectional, lacks polarity marking, and clamps symmetrically above ±7.5V. The "C" suffix denotes bidirectional construction per Diodes' ordering convention.
Can SMAJ7.5A-13 be used in place of SMAJ6.0A-13 for higher standoff voltage?
Yes - SMAJ7.5A-13 provides 7.5V standoff versus 6.0V, offering greater margin against normal operating voltage ripple. However, its 12.9V clamping voltage is 2.6V higher than SMAJ6.0A-13's 10.3V, which may exceed downstream IC absolute maximum ratings in some designs.
Is the SMA package of SMAJ7.5A-13 compatible with standard DO-214AC footprints?
Yes - SMAJ7.5A-13 uses the standardized DO-214AC (SMA) package with documented dimensions: length 4.80–5.59 mm, width 2.29–2.92 mm, height 1.27–1.63 mm, and terminal width 2.01–2.30 mm, matching IPC-7351B SMA footprint recommendations.
Does SMAJ7.5A-13 meet AEC-Q200 requirements for automotive use?
No - SMAJ7.5A-13 is not AEC-Q200 qualified. Diodes offers the automotive-grade P4SMAJ7.5A-13 variant, which undergoes extended temperature cycling, board-level vibration, and HTOL testing per AEC-Q200 Rev D for Grade 3 (–40°C to +125°C) applications.
SMAJ7.5A-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):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMAJ7.5A-13 FAQ
1.How can I place an order for SMAJ7.5A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5A-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 SMAJ7.5A-13 reliable?
The price and inventory of SMAJ7.5A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ7.5A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5A-13?
SMAJ7.5A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5A-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 SMAJ7.5A-13?
For technical support, including SMAJ7.5A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5A-13 requirements.
6.How does Aetrix verify that SMAJ7.5A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5A-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 SMAJ7.5A-13 meets industry standards.
7.What is the process for return or replacement of SMAJ7.5A-13?
All SMAJ7.5A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5A-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 SMAJ7.5A-13 part is unused and in its original packaging.
Return procedure for SMAJ7.5A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5A-13 Tags
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