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Diodes Incorporated SMAJ28CA-13-F
- Part No.:
- SMAJ28CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28CA-13-F.pdf
- Description:
- TVS DIODE 28VWM 45.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:284,169
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Product details
Overview
SMAJ28CA-13-F from Diodes Incorporated is a bidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power lines and signal interfaces. It features a 28V reverse standoff voltage (VRWM), 31.1–34.4V breakdown range (VBR), 45.4V max clamping voltage (VC) at 8.8A peak pulse current (IPP), and operates across –55°C to +150°C. Used in automotive infotainment power rails to suppress load dump and ISO 7637-2 transients.
For engineers reviewing the SMAJ28CA-13-F datasheet, SMAJ28CA-13-F pinout, SMAJ28CA-13-F application, or SMAJ28CA-13-F equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD tolerance, unidirectional/bidirectional polarity match, IEC 61000-4-5 surge current capability, and SMA package thermal derating above +25°C ambient.
Technical Context
This bidirectional TVS operates symmetrically-clamping both positive and negative transients without polarity dependency-making it suitable for AC-coupled data lines and floating supply rails. Its glass-passivated junction ensures stable leakage (<5 µA at VRWM) and repeatable breakdown behavior under repeated surge stress.
The device delivers 400W peak pulse power (8/20 µs waveform) with sub-nanosecond response time and is rated for 40A non-repetitive forward surge (8.3 ms half-sine). Thermal performance is defined by 1.0W steady-state dissipation at TL = +75°C and full derating above that temperature per Fig. 6.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - Sustains single 8/20 µs surges up to this level without failure; defines maximum energy absorption capability. |
| Reverse Standoff Voltage (VRWM) | 28 V - Maximum continuous DC or RMS voltage before significant leakage; sets upper limit for normal operating bias. |
| Breakdown Voltage (VBR) | 31.1–34.4 V @ 1.0 mA - Confirmed avalanche initiation range; ensures reliable turn-on before protected circuit exceeds absolute maximum ratings. |
| Max Clamping Voltage (VC) | 45.4 V @ IPP = 8.8 A - Upper voltage seen during worst-case surge; must remain below downstream IC's absolute maximum input rating. |
| Peak Pulse Current (IPP) | 8.8 A - Surge current corresponding to VC; used with source impedance to verify compliance with IEC 61000-4-5 Level 3 (1 A/2 Ω). |
| Operating Temperature | –55°C to +150°C - Validated junction temperature range; supports under-hood automotive and industrial environments. |
| Package | SMA - Standard surface-mount outline (4.0–4.6 mm length, 2.29–2.92 mm width); compatible with automated reflow and AOI inspection. |
Pinout & Package
Two-terminal SMA package with symmetrical bidirectional construction: no anode/cathode designation. Cathode band marking is absent-consistent with bidirectional TVS topology. Terminals are matte tin-plated for RoHS-compliant solderability per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient Input / Output Node | Connected to line under protection (e.g., CAN_H or 12V rail); conducts surge current bidirectionally to Terminal 2. |
| Terminal 2 | Reference / Ground Node | Tied to system ground or low-impedance return path; completes clamping loop during both polarities of transient event. |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables protection against high-energy transients like ISO 7637-2 Pulse 5a (load dump) without derating or parallel devices. |
| Glass Passivated Die | Ensures long-term parameter stability and low leakage drift over temperature and lifetime-critical for automotive reliability. |
| Bidirectional Symmetry | Clamps ±45.4 V equally-eliminates need for polarity-aware layout on differential buses (e.g., RS-485, CAN) or AC signals. |
| RoHS & Halogen-Free | Meets EU RoHS 3 (2015/863/EU) and Diodes' "Green" definition (<900 ppm Br/Cl, <1000 ppm Sb); supports eco-compliant manufacturing. |
Applications
| Automotive Power Rail Protection | Industrial RS-485 Interface |
|---|---|
|
Use Scenario: 12V battery-fed infotainment head unit exposed to ISO 7637-2 load dump (up to 60V, 400ms) and jump-start spikes. IC Role / Device Role / Timing Role: Primary clamping element placed between fuse output and DC-DC input, responding within <1 ns to limit voltage excursion. Use Value: Limits rail voltage to ≤45.4 V during 8.8A surge-within 85% of typical 5V LDO input rating-preventing latch-up or burnout. |
Use Scenario: Two-wire RS-485 transceiver (e.g., MAX1487) in factory automation PLC communicating over 200 m cable. IC Role / Device Role / Timing Role: Bidirectional line protector on A/B differential pair, shunting ESD (IEC 61000-4-2 ±15 kV) and fast transients (IEC 61000-4-4 ±2 kV). Use Value: Clamps common-mode surges to <45.4 V while maintaining <1.5 pF capacitance at 1 MHz-no signal integrity degradation at 10 Mbps. |
| Consumer USB-C Port | Smart Meter AC Mains Interface |
|
Use Scenario: USB-C receptacle on portable speaker subjected to human-body-model ESD during plug insertion. IC Role / Device Role / Timing Role: Secondary-level TVS after common-mode choke, protecting USB PD controller and CC logic pins. Use Value: Sub-ns response and <5 µA IR at 28 V ensure no standby current penalty or false triggering during hot-plug detection. |
Use Scenario: Isolated AC mains sensing input on utility smart meter using resistive divider and optocoupler. IC Role / Device Role / Timing Role: Overvoltage clamp on divider output node, limiting transient-induced optocoupler LED overcurrent. Use Value: Withstands 40A 8.3 ms surge (per IEC 61000-4-5) without degradation-maintaining accuracy over 10-year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-13-F | Unidirectional version; same VRWM, VBR, VC, and IPP-but only clamps positive transients. | Requires correct polarity placement; unsuitable for AC or floating nodes where negative excursions occur. | Select only if protecting a known-polarity DC rail with ground-referenced transients and space-constrained layout. |
| SMBJ28CA-T | Same electrical specs but SMB package (larger footprint, higher thermal mass); 600W peak power rating. | Higher surge margin and better thermal dissipation-but occupies ~2.5× PCB area of SMA. | Prefer when system-level testing reveals marginal margin with 400W or when board layout allows larger footprint for enhanced reliability. |
Compared with SMAJ28CA-13-F, the unidirectional SMAJ28A-13-F reduces design flexibility on bidirectional lines, while SMBJ28CA-T trades compactness for higher surge endurance-making SMAJ28CA-13-F optimal for space-constrained automotive and industrial modules requiring precise 28V clamping symmetry.
Availability
SMAJ28CA-13-F is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial RS-485 networks, and consumer USB-C port protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMAJ28CA-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 AEC-Q101 standards.
This device belongs to Diodes' SMAJ series of surface-mount TVS diodes engineered specifically for automotive-grade transient suppression-designed to meet ISO 7637-2, IEC 61000-4-2/4/5, and AEC-Q101 stress requirements.
FAQ
What is the difference between SMAJ28CA-13-F and SMAJ28A-13-F?
SMAJ28CA-13-F is bidirectional and clamps transients of either polarity symmetrically, while SMAJ28A-13-F is unidirectional and only clamps positive-going surges relative to ground. The 'C' suffix explicitly denotes bidirectional functionality, confirmed in Diodes' DS19005 datasheet Table 1 and marking diagram. Layout polarity is irrelevant for the 'C' version.
Does SMAJ28CA-13-F meet AEC-Q101 qualification?
No-SMAJ28CA-13-F is the standard industrial-grade part. Diodes offers a separate automotive-qualified variant, SMAJ28CAQ-13-F, documented in the AEC-Q101-compliant SMAJQ datasheet. This distinction is stated in the "For automotive applications…" note on page 1 of DS19005 Rev. 19-2.
What is the thermal resistance (RθJA) of the SMA package?
Diodes does not publish RθJA for the SMAJ series in DS19005. Instead, thermal performance is characterized via steady-state power derating: 1.0W at TL = +75°C (Fig. 6), with linear derating to zero at +150°C. PCB copper area and thickness directly impact actual junction temperature-designers must validate with thermal simulation or measurement.
Can SMAJ28CA-13-F be used in place of P6SMB28CA?
Yes-both are bidirectional 28V TVS diodes in SMA/SMB packages with identical VRWM (28V), VBR (31.1–34.4V), and VC (45.4V). P6SMB28CA uses the larger SMB package (600W rating), so SMAJ28CA-13-F fits tighter layouts but has lower surge margin. Electrical compatibility is confirmed per Diodes' cross-reference documentation and parametric tables.
SMAJ28CA-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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- 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
SMAJ28CA-13-F FAQ
1.How can I place an order for SMAJ28CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28CA-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 SMAJ28CA-13-F reliable?
The price and inventory of SMAJ28CA-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 SMAJ28CA-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ28CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28CA-13-F?
SMAJ28CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28CA-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 SMAJ28CA-13-F?
For technical support, including SMAJ28CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28CA-13-F requirements.
6.How does Aetrix verify that SMAJ28CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ28CA-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 SMAJ28CA-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ28CA-13-F?
All SMAJ28CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28CA-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 SMAJ28CA-13-F part is unused and in its original packaging.
Return procedure for SMAJ28CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ28CA-13-F Tags
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