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Diodes Incorporated SMAJ30CA-13-F
- Part No.:
- SMAJ30CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30CA-13-F.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:80,482
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Product details
Overview
SMAJ30CA-13-F from Diodes Incorporated is a bidirectional 400W transient voltage suppressor (TVS) diode in SMA package, designed for primary overvoltage protection of DC power rails and signal lines. It features a 30V reverse standoff voltage (VRWM), 33.3–36.8V breakdown range (VBR), 48.4V max clamping voltage (VC) at 8.3A peak pulse current, and operates from –55°C to +150°C - deployed in automotive infotainment power inputs and industrial sensor I/O interfaces.
For engineers reviewing the SMAJ30CA-13-F datasheet, SMAJ30CA-13-F pinout, SMAJ30CA-13-F application, or SMAJ30CA-13-F equivalent, key selection criteria include clamping voltage margin vs. protected IC VCC rating, unidirectional/bidirectional polarity match, peak pulse power derating above +25°C, and IATF 16949-sourced availability for automotive-grade designs.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical clamping behavior during positive and negative transients. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<5µA at VRWM), while the 8.3ms half-sine surge waveform compliance enables robust handling of lightning-induced surges per IEC 61000-4-5.
The device uses a planar junction structure optimized for fast response (<1.0ps), minimal capacitance (≈25pF at 1MHz/0V), and repeatable clamping performance under repetitive surge stress. Thermal design must account for PM(AV) = 1.0W at TL = +75°C and pulse derating above ambient - critical for high-density PCB layouts with limited copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms surges up to 400W without failure; derates linearly above +25°C ambient. |
| Reverse Standoff Voltage | 30V - maximum continuous DC or RMS voltage before significant leakage; sets upper limit for protected circuit operating voltage. |
| Breakdown Voltage | 33.3–36.8V @ 1mA - guaranteed conduction onset window; ensures reliable triggering before downstream component damage. |
| Clamping Voltage | 48.4V @ 8.3A - maximum voltage seen by protected load during specified surge; defines safe margin vs. IC absolute max rating. |
| Leakage Current | <5µA @ 30V - negligible standby power loss and signal integrity impact on low-power sensor or communication lines. |
| Operating Temp Range | –55°C to +150°C - qualified for under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with UL 94V-0 flammability rating; cathode band omitted (bidirectional configuration); weight ≈ 0.064g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient path | No polarity marking; terminals interchangeable - provides equal clamping for ± surges on same line pair. |
| Case / Body | Thermal & mechanical interface | Plastic body with matte tin-plated leads; solderable per MIL-STD-202, Method 208; requires thermal relief pads for 1.0W steady-state dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse rating | Enables protection against severe transients (e.g., ISO 7637-2 Pulse 5a) without cascading failure in 12V/24V systems. |
| Glass-passivated die | Ensures long-term parameter stability and resistance to humidity/moisture ingress in harsh environments. |
| RoHS 3 & "Green" compliant | Contains <900ppm Br, <900ppm Cl (<1500ppm total Br+Cl), <1000ppm Sb - meets global environmental compliance mandates. |
| Moisture sensitivity Level 1 | Zero floor life limitation - no baking required prior to reflow; simplifies SMT manufacturing flow. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: 12V battery rail in vehicle infotainment head unit exposed to load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converter input; responds within <1ns to suppress >100V transients. Use Value: Limits voltage to ≤48.4V during 8.3ms surge, preventing MOSFET gate oxide rupture and regulator latch-up. | Use Scenario: RS-485 data line in factory automation PLC I/O module subjected to ESD (IEC 61000-4-2) and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional shunt protector across differential pair; symmetrical clamping preserves signal integrity during ±8kV contact discharge. Use Value: Capacitance of ~25pF minimizes signal edge degradation at 10Mbps, while 48.4V clamping protects transceiver ESD diodes. |
| Telecom AC/DC Adapter Interface | Renewable Energy Monitoring Port |
Use Scenario: Secondary-side DC output of wall adapter powering Wi-Fi gateway, subject to surge coupling from mains side. IC Role / Device Role / Timing Role: Final-stage TVS on 5V/9V output rail; absorbs residual surges escaping primary-side MOV and Y-cap filtering. Use Value: 400W rating handles coupled 1kV/500A surges (per IEC 61000-4-5), maintaining regulated output within spec during transient. | Use Scenario: Modbus RTU port on solar inverter monitoring unit installed outdoors, exposed to induced lightning surges on long RS-485 runs. IC Role / Device Role / Timing Role: Bidirectional line-to-line and line-to-ground clamp; mounted directly at connector to minimize inductance. Use Value: –55°C to +150°C operation ensures reliability in desert-mounted enclosures; RoHS/Green compliance supports EU WEEE reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA from Littelfuse (part # SMAJ30CA) | Identical VRWM (30V), VBR (33.3–36.8V), VC (48.4V), and package; minor variation in leakage (<1µA vs. <5µA). | Same automotive/industrial use cases; Littelfuse version qualified to AEC-Q101 Grade 0 (–40°C to +150°C), Diodes version rated –55°C to +150°C. | Select Diodes part for extended low-temp operation; Littelfuse if AEC-Q101 Grade 0 documentation is contractually mandated. |
| P6SMB33CA from ON Semiconductor | Higher VRWM (33V), higher VC (53.3V @ 7.5A), same 600W rating but larger SMB package (vs. SMA); 20% larger footprint. | Acceptable where board space allows and 33V standoff is acceptable; not drop-in due to package and clamping mismatch. | Choose only if system design permits 33V standoff margin and SMB pad layout; avoid when protecting 3.3V/5V logic powered from 30V rail. |
Compared with SMAJ30CA-13-F, the Littelfuse SMAJ30CA offers tighter leakage but narrower temperature qualification, while the ON Semi P6SMB33CA trades higher clamping and larger size for greater surge margin - making Diodes' part optimal for space-constrained 30V-rail protection with wide-temperature resilience.
Availability
SMAJ30CA-13-F is available at Aetrix Electronics and suitable for automotive infotainment power inputs, industrial RS-485 sensor interfaces, and telecom DC adapter outputs requiring stable component supply across extended temperature ranges and full RoHS 3 compliance.
Supply support for SMAJ30CA-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
This device belongs to Diodes' SMAJ series of surface-mount TVS diodes, engineered specifically for high-reliability transient suppression in automotive, industrial, and communications infrastructure - emphasizing robust surge handling, tight parametric control, and IATF 16949-compliant production.
FAQ
What does the "C" suffix in SMAJ30CA-13-F indicate?
The "C" denotes a bidirectional configuration: the device clamps symmetrically for both positive and negative voltage transients, with no cathode band marking. This differs from unidirectional versions (e.g., SMAJ30A), which have polarity-sensitive anode/cathode terminals and a visible cathode band.
Is SMAJ30CA-13-F qualified for automotive applications?
No - the standard SMAJ30CA-13-F is not AEC-Q101 qualified. Diodes offers a separate automotive-compliant variant, SMAJ30CAQ-13-F, documented in DS19005Q, manufactured in IATF 16949-certified facilities and PPAP-capable. Use the "Q" suffix part for automotive production.
How does the SMA package affect thermal performance?
The SMA (DO-214AC) package has a thermal resistance of approximately 100°C/W junction-to-ambient (unmounted). With PM(AV) = 1.0W at TL = +75°C, effective heat sinking via copper pour and thermal vias is essential - especially in high-ambient environments like engine compartments or enclosed industrial cabinets.
Can SMAJ30CA-13-F replace SMAJ33CA in a 33V system?
No - SMAJ30CA has VRWM = 30V, meaning it may begin leaking significantly above that voltage, risking premature conduction in a 33V nominal system. SMAJ33CA (VRWM = 33V) is the correct choice; substituting SMAJ30CA risks false triggering, increased power loss, and reduced surge margin due to lower clamping threshold.
SMAJ30CA-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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- 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
SMAJ30CA-13-F FAQ
1.How can I place an order for SMAJ30CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30CA-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 SMAJ30CA-13-F reliable?
The price and inventory of SMAJ30CA-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 SMAJ30CA-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ30CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30CA-13-F?
SMAJ30CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30CA-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 SMAJ30CA-13-F?
For technical support, including SMAJ30CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30CA-13-F requirements.
6.How does Aetrix verify that SMAJ30CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ30CA-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 SMAJ30CA-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ30CA-13-F?
All SMAJ30CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30CA-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 SMAJ30CA-13-F part is unused and in its original packaging.
Return procedure for SMAJ30CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30CA-13-F Tags
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Diodes Incorporated
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