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Diodes Incorporated SMAJ20CA-13-F
- Part No.:
- SMAJ20CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20CA-13-F.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:248,678
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Product details
Overview
SMAJ20CA-13-F from Diodes Incorporated is a bidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for clamping ESD and surge events across power and signal lines. It features a 20V reverse standoff voltage (VRWM), 32.4V maximum clamping voltage at 12.3A peak pulse current, and operates from –55°C to +150°C - used in automotive infotainment power rails and industrial I/O protection circuits.
For engineers reviewing the SMAJ20CA-13-F datasheet, SMAJ20CA-13-F pinout, SMAJ20CA-13-F application, or SMAJ20CA-13-F equivalent, key selection criteria include clamping voltage margin relative to system operating voltage, unidirectional vs. bidirectional polarity requirements, JEDEC-standard SMA package thermal derating, and compliance with IEC 61000-4-2/4-5 surge immunity standards.
Technical Context
This TVS diode employs glass-passivated silicon junction construction for stable breakdown behavior and fast response (<1 ns) to transients. Its bidirectional configuration enables symmetric clamping of both positive and negative surges without polarity dependency.
The device delivers 400W peak pulse power (8.3 ms half-sine wave) with a steady-state power dissipation of 1.0 W at 75°C lead temperature. Clamping performance is validated at IPP = 12.3 A, where VC remains ≤32.4 V - critical for protecting 24V nominal systems against ISO 7637-2 Pulse 1/2b surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3 ms surge events per IEC 61000-4-5 without failure |
| Reverse Standoff Voltage (VRWM) | 20 V - maximum continuous DC or RMS voltage before significant leakage begins |
| Clamping Voltage (VC) | 32.4 V @ IPP = 12.3 A - upper voltage limit imposed on protected circuit during surge |
| Breakdown Voltage (VBR) | 22.2–24.5 V @ IT = 1.0 mA - ensures reliable triggering above normal operating voltage |
| Leakage Current (IR) | ≤5.0 µA @ VRWM = 20 V - negligible standby power loss in battery-powered systems |
| Operating Temperature | –55°C to +150°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating; cathode band omitted due to bidirectional construction; weight ≈0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically - no polarity sensitivity; connects across protected line and ground or between differential lines |
| Case | Mechanical mounting / thermal path | Plastic body provides electrical isolation; copper lead frame enables PCB heat dissipation during surge events |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 24V bus lines |
| Glass-passivated die | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift |
| Bidirectional architecture | Eliminates need for polarity-aware layout - simplifies routing on differential interfaces like RS-485 or CAN FD |
| RoHS-compliant & halogen-free | Meets automotive ELV directive and IPC-J-STD-020 moisture sensitivity Level 1 handling requirements |
Applications
| Automotive Body Control Module | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protects 24V supply rail in BCM against load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of LDO regulators and microcontroller power inputs. Use Value: Limits transient excursions to ≤32.4 V, preventing latch-up or permanent damage to 3.3V/5V logic supplies downstream. |
Use Scenario: Shields 4–20 mA current loop input stage from field wiring ESD and induced surges. IC Role / Device Role / Timing Role: Fast-clamping shunt element placed across input terminals before signal conditioning amplifier. Use Value: Responds in <1 ns to divert >12 A surge current while maintaining analog accuracy via sub-5 µA leakage at 20 V. |
| Smart Energy Meter Communication Port | Medical Patient Monitor Sensor Interface |
Use Scenario: Guards RS-485 interface pins against ESD and lightning-induced surges in outdoor meter installations. IC Role / Device Role / Timing Role: Bidirectional TVS connected between A/B lines and ground to suppress common-mode and differential transients. Use Value: Symmetric clamping ensures signal integrity during ±15 kV contact ESD (IEC 61000-4-2) without polarity misalignment risk. |
Use Scenario: Protects low-noise biopotential front-end (ECG/EEG) from electrostatic discharge during patient connection. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) shunt device placed at connector entry point before instrumentation amplifier. Use Value: Sub-33 V clamping prevents saturation of high-gain amplifiers while adding negligible noise or bandwidth degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-13-F | Unidirectional; same VRWM, VBR, and VC specs but asymmetric conduction | Requires correct polarity placement; unsuitable for AC or differential signal lines | Select only when protecting DC rails with known polarity and no reverse-voltage risk |
| SMBJ20CA | Same electrical specs but SMB (DO-214AA) package - 30% larger footprint and higher thermal mass | Lower power density; better steady-state dissipation but incompatible with SMA-reflow profiles | Choose when board space allows and higher PM(AV) margin (>1.5 W) is required for repetitive surge scenarios |
Compared with SMAJ20CA-13-F, the unidirectional SMAJ20A-13-F demands strict polarity alignment and lacks differential-line compatibility, while SMBJ20CA trades compactness for improved thermal handling - making the original SMAJ20CA-13-F optimal for space-constrained, bidirectional surge protection in automotive and industrial edge nodes.
Availability
SMAJ20CA-13-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, smart utility metering, and medical sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMAJ20CA-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and product qualification to AEC-Q101 standards.
This device belongs to the SMAJ series of surface-mount TVS diodes engineered specifically for high-reliability transient suppression in automotive, industrial, and communications infrastructure - emphasizing low clamping voltage, repeatable surge endurance, and green material compliance.
FAQ
What is the maximum peak pulse current (IPP) rating for SMAJ20CA-13-F?
The maximum peak pulse current is 12.3 A, measured at a clamping voltage of 32.4 V under an 8.3 ms single half-sine waveform per IEC 61000-4-5. This value is derived directly from the datasheet's Electrical Characteristics table and reflects worst-case surge capability at 25°C ambient.
Does SMAJ20CA-13-F have polarity markings on the package?
No - because it is a bidirectional TVS diode, the SMA package omits the cathode band marking. Both terminals are electrically symmetrical, allowing installation without orientation concern across differential lines or AC-coupled signals.
Can SMAJ20CA-13-F be used in automotive under-hood applications?
Yes - it is rated for operation from –55°C to +150°C and manufactured in IATF 16949-certified facilities. While the standard SMAJ20CA-13-F is not AEC-Q101 qualified, its automotive-grade counterpart SMAJ20CAQ is available separately with full PPAP documentation.
How does the clamping voltage of SMAJ20CA-13-F compare to system voltage margins?
With a 32.4 V clamping voltage and 20 V standoff, it provides 12.4 V headroom above VRWM - sufficient to protect 24 V nominal systems (±10% tolerance = 21.6–26.4 V) against ISO 7637-2 Pulse 1 (–150 V) and Pulse 2b (100 V) without compromising downstream ICs rated for 36 V absolute maximum.
SMAJ20CA-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 12.3A
- 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
SMAJ20CA-13-F FAQ
1.How can I place an order for SMAJ20CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20CA-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 SMAJ20CA-13-F reliable?
The price and inventory of SMAJ20CA-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 SMAJ20CA-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ20CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20CA-13-F?
SMAJ20CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20CA-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 SMAJ20CA-13-F?
For technical support, including SMAJ20CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20CA-13-F requirements.
6.How does Aetrix verify that SMAJ20CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ20CA-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 SMAJ20CA-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ20CA-13-F?
All SMAJ20CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20CA-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 SMAJ20CA-13-F part is unused and in its original packaging.
Return procedure for SMAJ20CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ20CA-13-F Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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