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Diodes Incorporated SMAJ20A-13-F
- Part No.:
- SMAJ20A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20A-13-F.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:24,685
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Product details
Overview
SMAJ20A-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 20V reverse standoff voltage (VRWM), 22.2V minimum breakdown voltage (VBR), 32.4V maximum clamping voltage (VC) at 12.3A peak pulse current (IPP), and operates across –55°C to +150°C. It is used in automotive infotainment power rails to suppress load dump and ISO 7637-2 transients.
For engineers reviewing the SMAJ20A-13-F datasheet, SMAJ20A-13-F pinout, SMAJ20A-13-F application, or SMAJ20A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, peak pulse current capability under 8.3ms half-sine surge, unidirectional polarity alignment with DC bias, and SMA package thermal performance under board-level power dissipation constraints.
Technical Context
This TVS diode employs glass-passivated silicon junction construction for stable avalanche clamping behavior and fast response (<1 ns). Its unidirectional configuration enables integration into polarized DC circuits without reverse-bias leakage concerns above VRWM.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) immunity standards when applied with appropriate PCB layout-short traces, low-inductance grounding, and minimal loop area between anode/cathode and protected node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3ms surge events without failure under defined derating |
| Reverse Standoff Voltage | 20 V - maximum continuous DC voltage before significant leakage; sets upper limit for protected line voltage |
| Clamping Voltage | 32.4 V @ 12.3 A - maximum voltage seen by downstream circuit during worst-case transient |
| Breakdown Voltage | 22.2–24.5 V @ 1 mA - ensures reliable turn-on before clamping threshold is exceeded |
| Leakage Current | 5 µA @ 20 V - negligible standby power loss in always-on systems like automotive body controllers |
| Package | SMA (DO-214AC) - surface-mount footprint compatible with automated assembly; 0.064 g mass aids thermal management |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating; cathode band denotes unidirectional polarity; terminals feature matte tin plating per MIL-STD-202.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path during positive transients |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 12V battery rail); conducts avalanche current to ground when VRWM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Enables robust protection against ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a (load dump) in 12V automotive systems |
| Glass-passivated die | Ensures long-term parameter stability and resistance to humidity-induced degradation in harsh environments |
| Fast response time | <1 ns turn-on delay prevents sub-microsecond ESD/EFT energy from reaching sensitive ICs |
| RoHS & Halogen-free | Meets automotive ELV directive and JPCA-0010A green manufacturing requirements for Tier 1 supply chains |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and CAN transceiver power pins from battery line transients during ignition cycling and alternator load dump. IC Role / Device Role: Primary clamping element placed directly at connector entry point before local LDOs and interface ICs. Use Value: Limits voltage excursion to ≤32.4 V during 12.3 A surge, preventing latch-up or oxide breakdown in 3.3V/5V logic devices. | Use Scenario: Safeguarding 24V DC digital input channels against field-wiring induced surges and relay coil flyback. IC Role / Device Role: Front-end transient suppressor on isolated input stage, coordinated with optocoupler input impedance. Use Value: Maintains <5 µA leakage at 24V nominal, avoiding false triggering while clamping to safe levels for downstream Schmitt triggers. |
| Telecom Power Supply OVP | Medical Equipment ESD Protection |
Use Scenario: Overvoltage protection on secondary-side 20V bias rails feeding FET gate drivers in telecom AC/DC adapters. IC Role / Device Role: Secondary-side crowbar element that activates only during fault conditions, not during normal regulation ripple. Use Value: 20V VRWM aligns precisely with 20V output tolerance band, enabling tight clamping without nuisance conduction. | Use Scenario: IEC 60601-1 compliant ESD protection on patient-connected analog front-end sensor inputs. IC Role / Device Role: Low-capacitance (≈100 pF) unidirectional clamp on differential biopotential lines. Use Value: Sub-33V clamping preserves signal integrity of ±5V instrumentation amplifiers while meeting 15 kV contact discharge requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/5A (Vishay) | Identical VRWM (20V), VC = 32.4V, but rated for 1 kW peak power per JEDEC test condition | Higher PPK allows longer surge duration handling; requires verification of board thermal relief for sustained pulses | Select when system-level testing reveals margin shortfall in 8.3ms surge endurance |
| P6SMB20A (ON Semiconductor) | Same SMA package, VRWM = 20V, but VC = 32.5V and IPP = 12.2A; slightly higher leakage (10 µA @ 20V) | Functionally interchangeable in most 12V systems; lower cost but tighter thermal margin due to 1.0W PM(AV) | Prefer for cost-sensitive industrial designs where leakage sensitivity is low and thermal design is optimized |
Compared with SMAJ20A-13-F, SMAJ20A-E3/5A offers higher surge energy headroom at identical clamping, while P6SMB20A trades minor leakage increase for broader distribution availability-both require validation of PCB trace inductance impact on actual clamping performance.
Availability
SMAJ20A-13-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controller (PLC) inputs, telecom power supply overvoltage protection, and medical sensor interface designs requiring stable component supply and full RoHS/halogen-free compliance.
Supply support for SMAJ20A-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 centers across Asia and manufacturing in IATF 16949-certified facilities.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability DC line protection in automotive, industrial, and communications equipment where robustness against repetitive surge stress is mandatory.
FAQ
What is the maximum operating temperature for SMAJ20A-13-F?
The SMAJ20A-13-F has a specified junction temperature range of –55°C to +150°C. Its steady-state power dissipation is rated at 1.0 W at lead temperature TL = +75°C, with linear derating to zero at +150°C. This makes it suitable for under-hood automotive locations and industrial enclosures without forced cooling.
Does SMAJ20A-13-F meet AEC-Q101 qualification?
No-SMAJ20A-13-F is the standard commercial-grade variant. Diodes offers the automotive-qualified SMAJ20AQ-13-F under a separate datasheet (DS19005Q), which undergoes AEC-Q101 stress testing, PPAP documentation, and is manufactured in IATF 16949-certified facilities.
How does the cathode band indicate polarity on this device?
The cathode band on SMAJ20A-13-F identifies the cathode terminal, which must be connected to the line being protected (e.g., +12V rail), while the anode connects to ground. This unidirectional orientation ensures conduction only during positive transients-reverse-bias leakage remains below 5 µA at 20V.
Can SMAJ20A-13-F be used in bidirectional signal lines?
No-it is strictly unidirectional. For bidirectional protection (e.g., RS-485, USB D+/D−), use the SMAJ20CA-13-F variant, which lacks polarity marking and clamps symmetrically for both polarities, with doubled leakage specification for VRWM ≤10V devices (not applicable here).
SMAJ20A-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):
- 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
SMAJ20A-13-F FAQ
1.How can I place an order for SMAJ20A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20A-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 SMAJ20A-13-F reliable?
The price and inventory of SMAJ20A-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 SMAJ20A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ20A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20A-13-F?
SMAJ20A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20A-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 SMAJ20A-13-F?
For technical support, including SMAJ20A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20A-13-F requirements.
6.How does Aetrix verify that SMAJ20A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ20A-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 SMAJ20A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ20A-13-F?
All SMAJ20A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20A-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 SMAJ20A-13-F part is unused and in its original packaging.
Return procedure for SMAJ20A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ20A-13-F Tags
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ESD9B5.0ST5G
onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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