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Diodes Incorporated SMAJ36A-13-F
- Part No.:
- SMAJ36A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36A-13-F.pdf
- Description:
- TVS DIODE 36VWM 58.1VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:405,099
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Product details
Overview
SMAJ36A-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 36V reverse standoff voltage (VRWM), 40.0–44.2V breakdown voltage (VBR), 58.1V maximum clamping voltage (VC) at 6.9A peak pulse current (IPP), and operates across –55°C to +150°C. It is used in automotive infotainment power rails to suppress ISO 7637-2 load dump transients.
For engineers reviewing the SMAJ36A-13-F datasheet, SMAJ36A-13-F pinout, SMAJ36A-13-F application, or SMAJ36A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, peak pulse current capability under 8.3ms half-sine surge, unidirectional polarity alignment with DC bias, and SMA package thermal performance under sustained ambient temperatures up to +125°C.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when line voltage exceeds VRWM (36V), it transitions from high-impedance leakage mode (<5µA at VRWM) into low-impedance conduction, clamping the downstream circuit to ≤58.1V during a 400W 8.3ms transient. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1.0ps).
The device uses a single PN junction in SMA package with cathode band marking; its unidirectional configuration requires correct anode-to-ground/cathode-to-line orientation to avoid forward conduction during normal operation. Thermal derating follows a linear curve from 1.0W at TL = +75°C to zero at +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms half-sine surges without failure per REA 10×1000 waveform |
| Reverse Standoff Voltage | 36V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage | 40.0–44.2V @ 1.0mA - precise junction turn-on threshold defining clamping onset |
| Clamping Voltage | 58.1V @ 6.9A IPP - maximum voltage seen by protected circuit during worst-case surge |
| Leakage Current | <5µA @ 36V - negligible standby power loss and signal integrity impact |
| Operating Temperature | –55°C to +150°C - qualified for under-hood automotive and industrial power supply environments |
| Package | SMA - standardized surface-mount outline (4.0–4.6mm length, 2.29–2.92mm width) with JEDEC-compliant pad layout |
Pinout & Package
Package: SMA (Surface Mount Assembly), molded plastic case rated UL 94V-0, 0.064g mass, matte tin-plated terminals, cathode band polarity indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR |
| Anode | Reference node | Connected to system ground or low-impedance return path; completes shunt conduction loop |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse rating | Enables robust protection against ISO 7637-2 Test Pulse 5a (load dump) in 12V automotive systems |
| Glass-passivated die | Ensures long-term parameter stability and resistance to humidity-induced degradation |
| Fast response time | Sub-nanosecond junction turn-on limits voltage overshoot before downstream ICs experience overstress |
| RoHS 3 & "Green" compliant | Meets <900ppm Br/Cl and <1000ppm Sb requirements for environmentally regulated industrial and automotive programs |
| Moisture sensitivity Level 1 | Eliminates need for dry pack or bake-out prior to reflow soldering |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V battery-fed infotainment head unit exposed to load dump transients up to 60V for 400ms. IC Role / Device Role: Primary shunt TVS placed between VBAT and GND upstream of DC-DC converter input. Use Value: Clamps transient to 58.1V, maintaining <2.9V margin below 61V absolute max rating of buck controller IC. | Use Scenario: 24V digital input module receiving signals from field sensors in factory automation. IC Role / Device Role: Line-side TVS on each isolated DI channel to absorb induced surges from relay switching or ESD events. Use Value: Limits voltage excursion to ≤58.1V during 6.9A surge, preventing latch-up in optocoupler input stages. |
| Telecom Power Interface | Medical Equipment DC Supply |
Use Scenario: -48V telecom power feed entering base station equipment with lightning-induced surges. IC Role / Device Role: Unidirectional TVS on negative rail (cathode to -48V, anode to chassis ground) to clamp negative-going transients. Use Value: Maintains clamping at 58.1V magnitude regardless of polarity, compatible with standard -48V distribution architecture. | Use Scenario: 5V/12V internal DC supply rail in portable ultrasound device subjected to ESD per IEC 61000-4-2. IC Role / Device Role: Secondary-level TVS after primary filter, protecting analog front-end ADC reference and op-amp supplies. Use Value: Sub-5µA leakage avoids reference voltage drift; 58.1V clamping prevents damage to 16V-rated LDOs and precision regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36CA-13-F | Bidirectional version; symmetric clamping for AC-coupled or floating lines | Required where line may swing positive/negative relative to reference (e.g., RS-485 bus) | Select only if bidirectional protection is needed; otherwise unidirectional offers tighter VRWM tolerance and lower capacitance |
| SMBJ36A-13-F | Same electrical specs but SMB package (higher PM(AV) = 1.5W, larger footprint) | Better thermal dissipation in high-ambient or high-duty-cycle surge environments | Choose when board space allows and thermal margin is critical; SMA remains optimal for dense automotive PCBs |
Compared with SMAJ36CA-13-F, the unidirectional SMAJ36A-13-F provides lower leakage and sharper knee in DC-biased applications; versus SMBJ36A-13-F, it trades 0.5W steady-state power rating for 30% smaller PCB area-critical in space-constrained ADAS modules.
Availability
SMAJ36A-13-F is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial PLC I/O protection, and medical device DC supply stabilization requiring stable component supply and full traceability.
Supply support for SMAJ36A-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.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability DC line protection in automotive, industrial, and communications infrastructure where AEC-Q200 stress testing compliance and tight parametric consistency are mandatory.
FAQ
What is the maximum clamping voltage of SMAJ36A-13-F at its rated peak pulse current?
The maximum clamping voltage (VC) is 58.1V at 6.9A peak pulse current (IPP), measured under the standardized 8.3ms half-sine waveform per REA 10×1000. This value is guaranteed across the full operating temperature range and represents the highest voltage the protected circuit will experience during a worst-case transient event.
Can SMAJ36A-13-F be used in bidirectional signal lines like RS-485?
No - SMAJ36A-13-F is unidirectional and will conduct continuously if reverse-biased beyond its forward voltage (~3.5V). For RS-485 or other AC-coupled interfaces, use the bidirectional variant SMAJ36CA-13-F, which clamps symmetrically above and below ground with identical 58.1V VC in both directions.
How does the SMA package affect thermal performance in continuous operation?
The SMA package delivers 1.0W steady-state power dissipation at TL = +75°C, derating linearly to zero at +150°C. Its small size limits heat spreading, so PCB copper area and thermal vias beneath the anode/cathode pads are essential to maintain junction temperature within –55°C to +150°C limits during repeated surge events.
Is SMAJ36A-13-F qualified for automotive applications per AEC-Q200?
No - the standard SMAJ36A-13-F is not AEC-Q200 qualified. Diodes offers a separate automotive-grade variant, SMAJ36AQ-13-F, which undergoes additional stress testing (temperature cycling, HAST, board flex) and is manufactured in IATF 16949-certified facilities with PPAP documentation support.
SMAJ36A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- 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
SMAJ36A-13-F FAQ
1.How can I place an order for SMAJ36A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36A-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 SMAJ36A-13-F reliable?
The price and inventory of SMAJ36A-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 SMAJ36A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ36A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36A-13-F?
SMAJ36A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36A-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 SMAJ36A-13-F?
For technical support, including SMAJ36A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36A-13-F requirements.
6.How does Aetrix verify that SMAJ36A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ36A-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 SMAJ36A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ36A-13-F?
All SMAJ36A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36A-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 SMAJ36A-13-F part is unused and in its original packaging.
Return procedure for SMAJ36A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ36A-13-F Tags
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Diodes Incorporated
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