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Diodes Incorporated SMAJ30A-13
- Part No.:
- SMAJ30A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30A-13.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:8,221
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Product details
Overview
SMAJ30A-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 30V reverse standoff voltage (VRWM), 33.3–36.8V breakdown voltage (VBR) at 1mA, 48.4V maximum clamping voltage (VC) at 8.3A peak pulse current, and operates from –55°C to +150°C. It is used in automotive body control modules to protect CAN transceiver I/O against ISO 7637-2 load dump and ESD events.
For engineers reviewing the SMAJ30A-13 datasheet, SMAJ30A-13 pinout, SMAJ30A-13 application, or SMAJ30A-13 equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, peak pulse current capability under 8.3ms surge, unidirectional polarity alignment with rail topology, and SMA package thermal performance under sustained transient stress.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1ps) to transient overvoltages while maintaining low leakage (<5μA at VRWM). Its unidirectional configuration provides forward conduction path during negative surges only when cathode is biased positive relative to anode - critical for protecting grounded-rail interfaces.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive transients). Clamping behavior is characterized using a 10/1000μs waveform per REA definition, with derating applied above 25°C ambient per Fig. 1 in DS19005 Rev. 12–2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (non-repetitive, 8.3ms half-sine, defines maximum single-event energy absorption) |
| Reverse Standoff Voltage | 30V (maximum continuous DC voltage before significant leakage; sets minimum operating rail margin) |
| Breakdown Voltage | 33.3–36.8V @ 1mA (guaranteed conduction onset range; ensures reliable triggering above VRWM) |
| Clamping Voltage | 48.4V @ 8.3A (maximum voltage seen by protected circuit during specified surge; determines IC survivability) |
| Leakage Current | <5μA @ 30V (low standby loss; avoids battery drain in always-on automotive modules) |
| Operating Temperature | –55°C to +150°C (supports under-hood deployment without derating) |
| Package | SMA (DO-214AC; 4.80–5.59mm length, 2.29–2.92mm height; enables high-density PCB layout) |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode indicated by band on one end. Terminals are solderable per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path | Connected to ground or low-impedance reference; completes clamping loop during overvoltage event |
| Cathode | Protected line connection | Connected to rail or signal line being safeguarded; blocks normal operation but conducts during surge |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Supports robust protection against ISO 7637-2 Test Pulse 1 (load dump) without degradation |
| Glass-Passivated Die | Ensures stable VBR and low parameter drift across temperature and lifetime |
| Fast Response Time | <1ps junction response enables suppression before sensitive downstream logic is stressed |
| RoHS Compliant / Lead-Free | Matte tin finish meets EU Directive Annex exemptions; compatible with lead-free reflow profiles |
| Unidirectional Polarity | Prevents unintended conduction on negative-going signals; simplifies placement in DC-biased rails |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting 12V supply rail of BCM microcontroller against load dump transients up to +120V for 400ms. IC Role / Device Role / Timing Role: Primary clamping element placed between fuse and LDO input; activates within nanoseconds to limit rail voltage to ≤48.4V. Use Value: Prevents LDO overvoltage failure and MCU brownout, enabling compliance with ISO 16750-2 Class D. | Use Scenario: Safeguarding 24V digital input channel of modular PLC against field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Front-end transient absorber in optocoupler input stage; shunts surge energy before current-limiting resistor. Use Value: Maintains input threshold integrity and eliminates false triggering caused by 4kV contact ESD per IEC 61000-4-2. |
| DC Power Adapter Output | Telecom Line Interface |
Use Scenario: Secondary-side overvoltage clamp on 5V/12V USB-C PD adapter output to meet UL 62368-1 fault tolerance. IC Role / Device Role / Timing Role: Last-line defense after primary OVP IC; clamps residual overshoot during AC-to-DC converter startup or short-circuit recovery. Use Value: Limits output voltage excursion to <50V, preventing damage to connected Type-C controller or cable e-marker IC. | Use Scenario: Protection of RS-485 transceiver VCC pin against lightning-induced surges on long-haul data lines. IC Role / Device Role / Timing Role: Rail clamp parallel to local bulk capacitor; diverts surge current away from transceiver's internal LDO and ESD structures. Use Value: Enables 15kV air discharge immunity without external series impedance, preserving signal integrity at 10Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA-13 | Bi-directional version; symmetrical clamping for AC-coupled or floating signal lines | Required where bidirectional surges occur (e.g., RS-485 differential pairs); not suitable for DC rails with defined polarity | Select only if protecting balanced or AC-signaled paths; adds no benefit for unidirectional 12V/24V rails |
| SMBJ30A-13 | Same electrical specs but SMB package (larger footprint, higher thermal mass, 600W PPK rating) | Better suited for high-volume industrial designs requiring higher surge margin or manual rework accessibility | Choose when board space allows larger package and system-level testing demands >400W surge headroom |
Compared with SMAJ30CA-13 and SMBJ30A-13, SMAJ30A-13 offers optimal density and cost for unidirectional DC rail protection, with verified clamping performance at 8.3A and full automotive temperature support - making it preferred for space-constrained automotive and embedded power domains.
Availability
SMAJ30A-13 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC digital inputs, DC power adapter outputs, and telecom line interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMAJ30A-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 the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability overvoltage protection in automotive, industrial, and communications infrastructure where compact size, precise clamping, and AEC-Q200 readiness are essential.
FAQ
What is the maximum clamping voltage of SMAJ30A-13 at its rated peak pulse current?
The maximum clamping voltage (VC) is 48.4V at 8.3A peak pulse current (Ipp), measured under 8.3ms half-sine waveform conditions per JEDEC standards. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuits during surge events.
Is SMAJ30A-13 RoHS compliant and lead-free?
Yes, SMAJ30A-13 is RoHS compliant per EU Directive 2011/65/EU, with a matte tin lead finish. It meets J-STD-020C moisture sensitivity level 1 and is qualified for standard lead-free reflow profiles up to 260°C peak temperature.
How does SMAJ30A-13 differ from SMAJ30CA-13?
SMAJ30A-13 is unidirectional and intended for DC rail protection with defined polarity; SMAJ30CA-13 is bi-directional, offering symmetrical clamping for AC-coupled or floating signal lines like RS-485. The "C" suffix explicitly denotes bi-directionality, and the two are not interchangeable without circuit review.
Can SMAJ30A-13 be used in place of P6SMB30A?
No - P6SMB30A is an SMB-package 600W TVS with different thermal and mechanical characteristics. While both have 30V VRWM, SMAJ30A-13's SMA package has lower thermal mass and 400W rating. Substitution requires validation of PCB layout, surge test margin, and thermal dissipation in the target application.
SMAJ30A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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
SMAJ30A-13 FAQ
1.How can I place an order for SMAJ30A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30A-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 SMAJ30A-13 reliable?
The price and inventory of SMAJ30A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ30A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ30A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30A-13?
SMAJ30A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30A-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 SMAJ30A-13?
For technical support, including SMAJ30A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30A-13 requirements.
6.How does Aetrix verify that SMAJ30A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ30A-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 SMAJ30A-13 meets industry standards.
7.What is the process for return or replacement of SMAJ30A-13?
All SMAJ30A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30A-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 SMAJ30A-13 part is unused and in its original packaging.
Return procedure for SMAJ30A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30A-13 Tags
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ESD9B5.0ST5G
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