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Alpha & Omega Semiconductor Inc. SMDJ7.5A
- Part No.:
- SMDJ7.5A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ7.5A.pdf
- Description:
- 1CH 7.5V UNIDIRECTIONAL 3000W SM
- Quantity:
- Payment:
- Shipping:
Inventory:3,193
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Product details
Overview
SMDJ7.5A from Alpha & Omega Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power lines and signal interfaces. It features a 7.5 V reverse stand-off voltage (VRWM), 8.33–9.21 V breakdown voltage (VBR) at 1 mA, 12.9 V maximum clamping voltage (VC) at 232.6 A peak pulse current, and 3000 W peak pulse power dissipation on a 10/1000 µs waveform - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMDJ7.5A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 232.6 A surge, thermal resistance (RθJA = 75 °C/W), unidirectional polarity with cathode band marking, DO-214AB package compatibility, and compliance with JEDEC standards for surface-mount reliability and lead-free assembly.
Technical Context
The SMDJ7.5A operates as a silicon avalanche diode optimized for fast transient suppression. Its glass-passivated junction enables sub-1 ps response time from 0 V to breakdown, while its low-profile DO-214AB package supports high-density PCB layouts without compromising thermal derating - validated at TJ = 150 °C max and mounted on 8.0 mm × 8.0 mm copper pads.
It delivers repeatable clamping action under 0.01% duty cycle conditions, with a typical temperature coefficient of ΔVBR = 0.1% × VBR per °C change from 25 °C. The device meets MSL Level 1 per J-STD-020 and UL 94V-0 flammability requirements, ensuring robustness in reflow-soldered industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 7.5 V - Maximum continuous reverse operating voltage before clamping begins; ensures no conduction during normal 7.5 V DC rail operation. |
| VBR @ IT=1 mA | 8.33–9.21 V - Measured breakdown range defines reliable turn-on threshold for surge events above nominal supply. |
| VC @ IPPM | 12.9 V - Clamped voltage at 232.6 A peak pulse current; limits downstream IC stress to safe levels during transients. |
| PPPM (10/1000 µs) | 3000 W - Peak pulse power handling capacity; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity designs. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient; requires minimum 8 mm × 8 mm copper pad area for full 3000 W rating. |
| IR @ VRWM | 100 µA - Reverse leakage at 7.5 V; negligible loading on low-power sensor or microcontroller supply rails. |
Pinout & Package
DO-214AB (SMC J-Bend) package: molded plastic case with matte tin lead-free plating, cathode indicated by color band; terminals solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected circuit ground or low-side return path | Provides low-impedance path to ground during reverse-transient clamping; must be routed with minimal inductance to preserve <1 ps response. |
| Cathode | Marked terminal (color band); connected to protected line (e.g., +7.5 V rail) | Defines unidirectional polarity - clamps only when cathode voltage exceeds anode by ≥8.33 V; incorrect orientation causes open-circuit failure. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | Typically <1.0 ps - enables clamping before transient energy couples into sensitive IC inputs, critical for USB, CAN, or RS-485 interface protection. |
| Glass passivated junction | Enhanced reliability and stable VBR over lifetime - eliminates moisture-induced parameter drift in humid industrial environments. |
| Built-in strain relief | Reduces mechanical stress at lead-to-body interface during thermal cycling - improves long-term solder joint integrity in automotive under-dash applications. |
| MSL Level 1 rating | Compatible with standard 260 °C peak reflow profiles - eliminates pre-baking requirements and simplifies SMT line integration. |
| UL 94V-0 flammability | Self-extinguishing plastic housing - satisfies safety requirements for enclosed power supplies and medical auxiliary equipment. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 7.5 V auxiliary rails in programmable logic controllers (PLCs) against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground to shunt >232 A surges within nanoseconds. Use Value: Limits voltage excursion to ≤12.9 V during 3000 W transients, preventing latch-up or gate oxide damage in downstream DC-DC controllers and microcontrollers. | Use Scenario: Safeguarding LIN bus transceivers and window motor drivers from battery reverse connection and jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 7.5 V local regulator output feeding BCM microcontroller I/O banks. Use Value: Maintains system uptime by absorbing 10/1000 µs surges up to 232.6 A without degradation, meeting ISO 7637-2 Pulse 1/2a/5a test requirements. |
| Telecom DC Feeder Protection | Smart Meter Power Input Stage |
Use Scenario: Guarding -48 V telecom power feeders against lightning-induced common-mode surges coupled onto distribution lines. IC Role / Device Role / Timing Role: Paired unidirectional SMDJ7.5A devices used in back-to-back configuration to clamp both polarities on isolated DC feeds. Use Value: Achieves bidirectional clamping capability while retaining tight 7.5 V standoff and 12.9 V VC - enabling compact dual-device solutions without dedicated bi-directional parts. | Use Scenario: Securing 7.5 V metering SoC supply against EFT bursts and capacitor discharge events during hot-plug battery replacement. IC Role / Device Role / Timing Role: Final-stage TVS on regulated 7.5 V rail upstream of metrology ADC and real-time clock circuitry. Use Value: Delivers 100 µA max leakage at VRWM to avoid measurement offset errors, while clamping EFT bursts (IEC 61000-4-4) to safe levels below 13 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC7.5 | Same DO-214AB package; lower PPPM (1500 W); higher VC (13.3 V at 116 A) | Rated for lighter-duty consumer electronics; insufficient for IEC 61000-4-5 Level 4 compliance | Select SMDJ7.5A when 3000 W surge handling and 12.9 V clamping are required for industrial-grade immunity. |
| 1.5SMC7.5A | Identical electrical specs and DO-214AB footprint; same 7.5 V VRWM, 8.33–9.21 V VBR, 12.9 V VC | Second-source alternative with identical performance; manufactured by multiple vendors including ON Semi and Vishay | Choose 1.5SMC7.5A for supply chain diversification where pin-to-pin and parametric equivalence are confirmed. |
Compared with SAC7.5, the SMDJ7.5A delivers double the surge power rating and tighter clamping - essential for harsh-environment designs; versus 1.5SMC7.5A, it offers identical protection performance but with AOS-specific process enhancements in junction stability and MSL1 reflow robustness.
Availability
SMDJ7.5A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom DC feeder systems, and smart meter power input stages requiring stable component supply and full IEC/ISO surge compliance.
Supply support for SMDJ7.5A 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
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, TVS diodes, and power ICs for computing, consumer, industrial, and automotive markets.
The SMDJ series was developed to deliver high-power, low-clamping TVS protection in compact surface-mount packages - targeting designers needing robust, JEDEC-compliant surge suppression without through-hole assembly constraints.
FAQ
What is the maximum clamping voltage of the SMDJ7.5A under surge conditions?
The SMDJ7.5A has a maximum clamping voltage (VC) of 12.9 V when subjected to its rated peak pulse current of 232.6 A on a 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures protected circuits remain below critical overvoltage thresholds during transient events. The SMDJ7.5A achieves this clamping performance while maintaining low leakage (<100 µA at 7.5 V) in steady-state operation.
Does the SMDJ7.5A support bidirectional transient suppression?
No, the SMDJ7.5A is a unidirectional TVS diode, intended for use on positive-rail protection where polarity is fixed. For bidirectional applications, the SMDJ7.5CA variant must be selected - it shares the same VRWM and clamping characteristics but conducts symmetrically in both directions. The SMDJ7.5A's cathode band marking and unidirectional construction make it unsuitable for AC or reversible-polarity signal lines without external circuitry.
What PCB layout considerations apply to the SMDJ7.5A to achieve its full 3000 W rating?
To achieve the full 3000 W peak pulse power rating, the SMDJ7.5A must be mounted on minimum 8.0 mm × 8.0 mm copper pads per terminal, as specified in the datasheet. Trace inductance must be minimized - especially on the cathode path - to preserve its <1 ps response time. Thermal vias under pads improve heat dissipation, and adjacent high-speed signals should be routed away to avoid coupling during clamping events. The SMDJ7.5A's DO-214AB footprint is standardized, enabling direct placement in existing SMC-compatible layouts.
Is the SMDJ7.5A compliant with lead-free assembly standards?
Yes, the SMDJ7.5A features matte tin lead-free plating and is rated for MSL Level 1 per J-STD-020, supporting peak reflow temperatures up to 260 °C without preconditioning. It is RoHS and halogen-free compliant per AOS Green Policy, making it suitable for modern lead-free SMT lines. The device's glass passivated junction and UL 94V-0 mold compound further ensure reliability under repeated thermal cycling encountered in Pb-free processes.
How does the SMDJ7.5A compare to standard 1N6xxx series TVS diodes?
The SMDJ7.5A replaces legacy through-hole 1N6xxx parts with superior surface-mount performance: it offers identical electrical specs (e.g., 1N6105A ≈ SMDJ7.5A) but in a smaller DO-214AB package, faster response (<1 ps vs. ~1 ns), lower thermal resistance, and MSL1 reflow compatibility. Unlike 1N6xxx, the SMDJ7.5A is optimized for high-density boards and automated assembly - delivering the same 3000 W surge rating without sacrificing board space or manufacturability.
SMDJ7.5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 232.6A
- Power - Peak Pulse:
- 3000W (3kW)
- 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:
- DO-214AB
SMDJ7.5A FAQ
1.How can I place an order for SMDJ7.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ7.5A 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 SMDJ7.5A reliable?
The price and inventory of SMDJ7.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ7.5A is usually 5 days.
3.What payment methods are accepted for SMDJ7.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ7.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ7.5A?
SMDJ7.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ7.5A 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 SMDJ7.5A?
For technical support, including SMDJ7.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ7.5A requirements.
6.How does Aetrix verify that SMDJ7.5A is sourced from the original manufacturer or authorized distributors?
All SMDJ7.5A 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 SMDJ7.5A meets industry standards.
7.What is the process for return or replacement of SMDJ7.5A?
All SMDJ7.5A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ7.5A, 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 SMDJ7.5A part is unused and in its original packaging.
Return procedure for SMDJ7.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ7.5A Tags
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