My Inquiry
My Account
Diodes Incorporated SMAJ70CA-13
- Part No.:
- SMAJ70CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CA-13.pdf
- Description:
- TVS DIODE 70VWM 113VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:2,066
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ70CA-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 70V reverse standoff voltage (VRWM), 77.8–86.0V breakdown range (VBR @ 1mA), 113V max clamping voltage at 3.5A peak pulse current (IPP), and operates from –55°C to +150°C junction temperature - used in industrial power supplies, automotive body control modules, and PoE-powered Ethernet interfaces.
For engineers reviewing the SMAJ70CA-13 datasheet, SMAJ70CA-13 pinout, SMAJ70CA-13 application, or SMAJ70CA-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VCC rating, unidirectional/bi-directional polarity match, IEC 61000-4-2/4-5 surge compliance capability, and thermal derating under sustained ambient conditions.
Technical Context
This bi-directional TVS diode uses glass-passivated silicon junction construction to achieve fast response time (<1 ps) and low dynamic impedance during ESD or lightning-induced transients. Its symmetrical avalanche behavior enables bidirectional clamping without polarity sensitivity, making it suitable for AC-coupled or floating signal paths.
The device complies with IEC 61000-4-2 (±30 kV contact discharge) and IEC 61000-4-5 (4kV 8/20μs surge) when properly laid out with minimal trace inductance. Clamping performance is validated at 1.0mA test current (IT) and specified up to 3.5A IPP with 8.3ms half-sine waveform per JEDEC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms surge events without failure under defined thermal conditions. |
| Reverse Standoff Voltage (VRWM) | 70V - maximum continuous DC or RMS voltage before significant leakage; sets minimum operating rail margin. |
| Breakdown Voltage (VBR) | 77.8–86.0V @ 1mA - defines onset of avalanche conduction; tight tolerance ensures predictable turn-on. |
| Max Clamping Voltage (VC) | 113V @ IPP = 3.5A - upper limit of voltage seen by downstream circuit during worst-case surge. |
| Peak Pulse Current (IPP) | 3.5A - maximum non-repetitive surge current the device can shunt while maintaining VC ≤ 113V. |
| Operating Temperature | –55°C to +150°C - supports under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| Package | SMA (DO-214AC) - surface-mount outline with 4.80–5.59mm body length and 2.01–2.30mm terminal spacing. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case, UL 94V-0 rated, cathode band omitted (bi-directional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bi-directional avalanche terminals | Identical electrical behavior in both directions; no polarity marking required; symmetric clamping. |
| Case | Non-electrical mechanical interface | No internal connection; serves only as thermal path and mounting surface; no isolation requirement. |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables robust protection against IEC 61000-4-5 Level 3 (2kV line-to-line) surges in 24V/48V systems. |
| Glass-Passivated Die | Improves long-term reliability and moisture resistance versus epoxy-passivated alternatives. |
| Bi-directional Symmetry | Eliminates orientation errors during placement and supports AC signal or differential bus protection. |
| RoHS Compliant (Lead-Free) | Matte tin finish meets EU Directive Annex exemptions; compatible with standard SnPb and lead-free reflow profiles. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24V DC input channels exposed to load dump and inductive switching transients in programmable logic controllers. IC Role / Device Role / Timing Role: Primary clamping element placed at connector entry point to divert surge energy before reaching MCU GPIO or analog front-end. Use Value: Limits transient voltage to ≤113V, protecting 3.3V/5V logic-level interface ICs with 16V absolute maximum rating. | Use Scenario: LIN bus and sensor supply lines in door module ECUs subject to ISO 7637-2 Pulse 1/2a/5a. IC Role / Device Role / Timing Role: Secondary overvoltage clamp parallel to upstream fuse and upstream TVS, handling residual spikes after primary suppression. Use Value: Maintains <5μA leakage at 70V VRWM, preserving battery drain budget over 15-year vehicle lifetime. |
| POE-Powered Ethernet Switch | Medical Patient Monitor Interface |
Use Scenario: 48V DC power input on IEEE 802.3af/at powered devices subjected to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: DC rail protector located immediately after PoE controller's DC-DC input filter stage. Use Value: Clamps 4kV IEC 61000-4-5 surges within 113V envelope, preventing latch-up in isolated DC-DC controllers. | Use Scenario: ECG electrode input protection where low capacitance and high reliability are critical for signal fidelity. IC Role / Device Role / Timing Role: First-stage transient limiter before instrumentation amplifier input network. Use Value: Delivers <10pF typical junction capacitance at 0V bias, minimizing high-frequency signal attenuation in 0.05–150Hz bio-signal path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA-13 | Same VRWM/VBR/VC specs but SMB package (larger footprint, 600W PPK) | Better thermal dissipation for higher-duty-cycle surge environments; requires PCB area increase | Select when >400W surge margin or extended thermal cycling life is required |
| SMCJ70CA-13 | Same electrical specs, SMC package (1500W PPK, 7.11mm x 6.22mm) | Higher surge endurance for harsh industrial or railway applications; incompatible with SMA land pattern | Choose for mission-critical infrastructure where single-event survivability exceeds 1000 surges |
Compared with SMBJ70CA-13 and SMCJ70CA-13, SMAJ70CA-13 offers optimal space-constrained protection for consumer-grade and cost-sensitive industrial designs where 400W peak power suffices and board real estate is limited to SMA footprints.
Availability
SMAJ70CA-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and PoE-powered Ethernet switches requiring stable component supply across multi-year production cycles.
Supply support for SMAJ70CA-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The SMAJ series belongs to Diodes' transient voltage suppressor product line, engineered specifically for high-reliability, surface-mount overvoltage protection in automotive, industrial, and communications infrastructure applications.
FAQ
What is the difference between SMAJ70CA-13 and SMAJ70A-13?
SMAJ70CA-13 is bi-directional (denoted by "C"), providing symmetrical clamping for AC or floating signals, while SMAJ70A-13 is unidirectional with a cathode band and only clamps in reverse bias. Bi-directional versions omit polarity marking and exhibit identical VBR in both directions - critical for differential data lines or transformer-coupled circuits.
Does SMAJ70CA-13 meet automotive AEC-Q200 requirements?
No - SMAJ70CA-13 is not AEC-Q200 qualified. Diodes Incorporated offers the automotive-grade P4SMAJ70CA series (with AEC-Q200 qualification, enhanced HTOL testing, and extended temperature screening) for under-hood applications requiring automotive reliability certification.
What is the typical junction capacitance of SMAJ70CA-13 at 0V bias?
Typical junction capacitance is 15 pF at 0V bias and 1 MHz, as shown in Figure 2 of the DS19005 datasheet. This value increases slightly with applied reverse voltage and decreases with frequency - relevant for high-speed signal line protection where capacitive loading must remain below 20 pF.
Can SMAJ70CA-13 be used in parallel for higher surge current handling?
No - paralleling TVS diodes is not recommended due to mismatched VBR causing uneven current sharing and premature failure of the lower-breakdown unit. For higher IPP, select a single device in SMB or SMC package (e.g., SMBJ70CA-13 or SMCJ70CA-13) with matching VRWM and tighter VBR tolerance.
SMAJ70CA-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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- 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
SMAJ70CA-13 FAQ
1.How can I place an order for SMAJ70CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CA-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 SMAJ70CA-13 reliable?
The price and inventory of SMAJ70CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ70CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CA-13?
SMAJ70CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CA-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 SMAJ70CA-13?
For technical support, including SMAJ70CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CA-13 requirements.
6.How does Aetrix verify that SMAJ70CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ70CA-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 SMAJ70CA-13 meets industry standards.
7.What is the process for return or replacement of SMAJ70CA-13?
All SMAJ70CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CA-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 SMAJ70CA-13 part is unused and in its original packaging.
Return procedure for SMAJ70CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70CA-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…
