My Inquiry
My Account
Diodes Incorporated SMAJ7.5CA-13
- Part No.:
- SMAJ7.5CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CA-13.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:7,923
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ7.5CA-13 from Diodes Incorporated is a bi-directional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 7.5V reverse standoff voltage (VRWM), 8.33–9.21V breakdown voltage (VBR) at 1.0mA, 12.9V max clamping voltage (VC) at 31.0A peak pulse current (IPP), and operates from –55°C to +150°C - used in automotive infotainment power inputs and industrial PLC I/O modules.
For engineers reviewing the SMAJ7.5CA-13 datasheet, SMAJ7.5CA-13 pinout, SMAJ7.5CA-13 application, or SMAJ7.5CA-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VCC tolerance, unidirectional/bi-directional polarity matching, 400W peak pulse power handling under 8.3ms waveform, and SMA package thermal performance in high-density PCB layouts.
Technical Context
This bi-directional TVS diode uses glass-passivated silicon junction technology to provide symmetrical clamping for AC-coupled or floating signal paths. Its low 12.9V clamping voltage at 31.0A IPP ensures robust protection of 5V/3.3V logic interfaces without overstressing downstream components.
The device complies with JEDEC-standard 8.3ms half-sine surge testing and derates linearly above 25°C ambient per Fig. 1, maintaining ≥75% of rated 400W pulse power up to +75°C board temperature - critical for under-hood automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms surge events without failure; defines maximum energy absorption capability |
| Clamping Voltage VC | 12.9V @ 31.0A - limits voltage seen by protected circuit during worst-case surge |
| Breakdown Voltage VBR | 8.33–9.21V @ 1.0mA - onset of avalanche conduction; sets minimum trigger threshold |
| Reverse Standoff VRWM | 7.5V - maximum continuous DC voltage before leakage exceeds 100µA |
| Operating Temperature | –55°C to +150°C - qualified for under-hood automotive and industrial control environments |
| Package | SMA (DO-214AC) - surface-mount footprint compatible with automated assembly; 2.01–2.30mm lead span (J dimension) |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band omitted (bi-directional configuration). Weight: 0.064g. Moisture sensitivity level: MSL 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bi-directional terminals | Identical avalanche behavior in both polarities; no polarity marking required |
| Case | Non-electrical mechanical interface | Plastic body provides insulation and thermal path to PCB copper; no internal connection |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Rating | Enables protection against IEC 61000-4-5 Level 4 surges (4kV/2Ω) on 12V supply rails |
| Glass-Passivated Die | Improves long-term reliability and stability of VBR under thermal cycling vs. epoxy-passivated alternatives |
| Bi-directional Symmetry | Supports AC signal line protection (e.g., RS-485, CAN bus) without polarity concerns |
| RoHS Compliant (Lead-Free) | Matte tin finish meets EU Directive Annex exemptions; compatible with standard SnPb and lead-free reflow profiles |
Applications
| Automotive Body Control Module (BCM) Power Input | Industrial RS-485 Communication Port |
|---|---|
Use Scenario: Protects 12V power rail feeding microcontroller and CAN transceiver from load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of LDO regulator input. Use Value: 12.9V clamping ensures protected ICs remain below absolute maximum ratings during 35V/100ms load dump events. | Use Scenario: Shields differential RS-485 transceiver pins from ESD and lightning-induced surges on factory floor cabling. IC Role / Device Role / Timing Role: Bi-directional shunt clamp across A/B data lines referenced to ground. Use Value: Symmetrical clamping preserves signal integrity during ±8kV contact ESD (IEC 61000-4-2) without polarity misalignment. |
| Consumer USB-C Power Delivery Interface | Medical Patient Monitor Analog Sensor Inputs |
Use Scenario: Guards VBUS line in USB-C receptacle against hot-plug overshoot and cable discharge events. IC Role / Device Role / Timing Role: First-line transient suppressor between connector and buck converter input. Use Value: 7.5V VRWM allows safe operation with 5V nominal VBUS while clamping spikes to ≤12.9V. | Use Scenario: Protects low-noise instrumentation amplifiers connected to external patient electrodes from defibrillation pulses. IC Role / Device Role / Timing Role: High-impedance shunt clamp on isolated analog front-end inputs. Use Value: 400W rating handles 100V/10ms defib pulse energy without degradation; 100µA IR avoids DC offset error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ7.5CA-13 | Same electrical specs but SMB (DO-214AA) package; 3.5mm width vs. SMA's 2.92mm max width | Higher thermal mass; better steady-state power dissipation but larger PCB footprint | Select when board layout allows wider package and higher PM(AV) margin is needed |
| SMCJ7.5CA-13 | Same VRWM/VBR/VC but SMC (DO-214AB) package; 7.0mm width, 1.5W PM(AV) vs. SMAJ's 1.0W | Superior surge endurance for repeated events; requires >2× PCB area | Choose for high-reliability industrial systems with frequent surge exposure |
Compared with SMBJ7.5CA-13 and SMCJ7.5CA-13, SMAJ7.5CA-13 offers the smallest footprint and lowest profile for space-constrained designs, trading off some thermal mass and steady-state power handling - optimal where PCB real estate is prioritized over multi-pulse endurance.
Availability
SMAJ7.5CA-13 is available at Aetrix Electronics and suitable for automotive body electronics, industrial communication ports, USB-C PD interfaces, and medical sensor front-ends requiring stable component supply across extended production lifecycles.
Supply support for SMAJ7.5CA-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design and manufacturing operations across Asia and the Americas.
The SMAJ series belongs to Diodes' transient voltage suppressor product line, engineered specifically for high-energy surge protection in automotive, industrial, and consumer power and interface circuits.
FAQ
What is the meaning of the 'C' suffix in SMAJ7.5CA-13?
The 'C' denotes bi-directional functionality, confirming symmetrical avalanche behavior in both forward and reverse bias - essential for protecting AC-coupled or floating signal lines like RS-485 or CAN bus. This differs from unidirectional variants (e.g., SMAJ7.5A-13) that only clamp in reverse.
Can SMAJ7.5CA-13 be used in place of a unidirectional TVS on a DC rail?
Yes, but with reduced efficiency: its bi-directional structure increases leakage current slightly versus unidirectional equivalents at the same VRWM. For pure DC applications like 12V power input, a unidirectional part (e.g., SMAJ7.5A-13) offers lower IR and tighter VBR tolerance - though SMAJ7.5CA-13 remains electrically safe.
What is the maximum allowable PCB trace length between SMAJ7.5CA-13 and the protected IC?
To maintain effective clamping, trace inductance must be minimized: total loop inductance (device + trace + ground return) should stay below 10nH. For typical 1oz copper, this corresponds to ≤5mm total trace length from TVS anode/cathode pads to protected node and ground plane - verified via TDR measurement in production validation.
Does SMAJ7.5CA-13 meet AEC-Q200 stress test requirements?
No - while it operates from –55°C to +150°C and is widely used in automotive applications, SMAJ7.5CA-13 is not AEC-Q200 qualified. For AEC-Q200-compliant alternatives, consider Diodes' AEC-Q200-qualified P4SMAJ7.5CA series, which undergoes additional temperature cycling and humidity testing.
SMAJ7.5CA-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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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
SMAJ7.5CA-13 FAQ
1.How can I place an order for SMAJ7.5CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CA-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 SMAJ7.5CA-13 reliable?
The price and inventory of SMAJ7.5CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CA-13?
SMAJ7.5CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CA-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 SMAJ7.5CA-13?
For technical support, including SMAJ7.5CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CA-13 requirements.
6.How does Aetrix verify that SMAJ7.5CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CA-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 SMAJ7.5CA-13 meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CA-13?
All SMAJ7.5CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CA-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 SMAJ7.5CA-13 part is unused and in its original packaging.
Return procedure for SMAJ7.5CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5CA-13 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
