My Inquiry
My Account
Diodes Incorporated SMAJ45CA-13
- Part No.:
- SMAJ45CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CA-13.pdf
- Description:
- TVS DIODE 45VWM 72.7VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,999
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ45CA-13 from Diodes Incorporated is a 400W bi-directional transient voltage suppressor (TVS) diode in SMA package, designed for clamping ESD and surge transients on data lines and power rails. It features a 45V reverse standoff voltage (VRWM), 72.7V maximum clamping voltage (VC) at 5.5A peak pulse current (IPP), and operates from –55°C to +150°C - deployed in industrial Ethernet interfaces and automotive body control modules.
For engineers reviewing the SMAJ45CA-13 datasheet, SMAJ45CA-13 pinout, SMAJ45CA-13 application, or SMAJ45CA-13 equivalent, key selection criteria include clamping voltage margin vs. system rail, unidirectional/bi-directional polarity requirement, junction capacitance (<100 pF at 0 V), thermal derating above 25°C ambient, and RoHS-compliant lead-free plating compatibility with reflow profiles.
Technical Context
This bi-directional TVS diode uses glass-passivated silicon junction construction to achieve fast response time (<1 ns) and stable breakdown behavior under repetitive 8.3 ms half-sine surges. Its symmetrical I–V characteristic enables protection of AC-coupled or floating signal paths without polarity constraints.
The device complies with IEC 61000-4-2 (ESD ±30 kV air/±25 kV contact) and IEC 61000-4-5 (surge Level 3, 1 kV line-to-line) when properly laid out. Clamping performance is validated at IT = 1.0 mA and IPP = 5.5 A with VC ≤ 72.7 V, ensuring safe margin below 75 V-rated downstream ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3 ms surge events without failure under JEDEC test conditions |
| Reverse Standoff Voltage | 45 V - maximum continuous DC or RMS voltage before significant leakage begins |
| Clamping Voltage | 72.7 V @ 5.5 A - limits transient voltage seen by protected circuit during worst-case surge |
| Junction Capacitance | <100 pF @ 0 V - low enough for USB 2.0, RS-485, and CAN FD signal integrity |
| Operating Temperature | –55°C to +150°C - supports under-hood automotive and industrial outdoor deployments |
| RoHS Compliance | Lead-free matte tin finish - compatible with Pb-free reflow soldering per J-STD-020C Level 1 |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with UL 94V-0 flammability rating; cathode band omitted (bi-directional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bi-directional terminals | Interchangeable - forms symmetrical clamping path for positive and negative transients |
| Case | Non-electrical mechanical interface | No internal connection; serves only as thermal mass and mounting structure |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable, low-leakage breakdown with <5 µA IR at VRWM and high reliability over temperature |
| 400W peak pulse rating | Supports IEC 61000-4-5 surge testing up to 1 kV line-to-line without degradation |
| Fast response time | <1 ns turn-on ensures clamping initiates before sensitive ICs experience overvoltage stress |
| Bi-directional symmetry | Eliminates need for polarity-aware layout; protects AC signals, differential buses, and floating grounds |
Applications
| Industrial Ethernet Port Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protects RJ45 PHY interface against ESD and lightning-induced surges in factory automation gateways. IC Role / Device Role / Timing Role: Primary clamping element placed between transformer center-taps and PHY pins. Use Value: Limits transient voltage to ≤72.7 V, preserving PHY ICs rated for 75 V absolute max while maintaining sub-100 pF signal loading. | Use Scenario: Shields LIN bus transceivers and microcontroller I/Os from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Secondary overvoltage clamp across supply rail (VBAT) and ground, downstream of primary fuse. Use Value: Withstands 40 A surge current for 8.3 ms and operates reliably at 150°C under hood, meeting ISO 7637-2 Pulse 5a requirements. |
| USB 2.0 Data Line Protection | RS-485 Transceiver Interface |
Use Scenario: Guards D+ and D− lines in portable medical devices against user-handling ESD events. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector, before ESD filter capacitor. Use Value: Junction capacitance <100 pF avoids signal rise-time degradation; clamps ±15 kV contact ESD to <75 V. | Use Scenario: Safeguards full-duplex RS-485 transceivers in building HVAC controllers exposed to long cable runs. IC Role / Device Role / Timing Role: Bi-directional clamp across differential pair (A/B) and ground reference plane. Use Value: Symmetric clamping ensures equal protection for both polarities; 400W rating handles induced surges from nearby motor switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43CA-13 | Lower VRWM (43 V), lower VC (69.4 V @ 5.7 A) | Better margin for 48 V nominal systems with tighter clamping headroom | Select when system operating voltage is ≤43 V and clamping voltage must stay below 70 V |
| SMAJ48CA-13 | Higher VRWM (48 V), higher VC (77.4 V @ 5.2 A) | Improved immunity to normal-mode ripple on 48 V rails; less prone to leakage at 45 V | Select when system has >45 V transients or requires reduced standby leakage at nominal voltage |
Compared with SMAJ43CA-13 and SMAJ48CA-13, SMAJ45CA-13 offers optimal balance for 45 V nominal systems - delivering sufficient margin above typical 42–45 V battery-derived rails while maintaining clamping voltage well below 75 V IC limits.
Availability
SMAJ45CA-13 is available at Aetrix Electronics and suitable for industrial Ethernet port protection, automotive body control modules, USB 2.0 data line protection, and RS-485 transceiver interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMAJ45CA-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 the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for robust, low-cost, surface-mount surge protection in harsh environments - emphasizing high peak power, wide temperature operation, and RoHS-compliant manufacturability.
FAQ
What is the difference between SMAJ45CA-13 and SMAJ45A-13?
SMAJ45CA-13 is bi-directional (suffix 'C'), meaning it clamps both positive and negative transients symmetrically across its terminals. SMAJ45A-13 is unidirectional, with a defined anode/cathode and only clamps negative transients relative to its cathode. The bi-directional version lacks a cathode band marking and is used where polarity is undefined or alternating.
Can SMAJ45CA-13 be used in place of a unidirectional TVS in a DC power rail?
Yes - SMAJ45CA-13 can protect DC rails, but its bi-directional nature means it will conduct during both positive and negative excursions. For pure DC applications with no risk of reverse polarity, a unidirectional part may offer lower leakage at VRWM. However, SMAJ45CA-13 provides added safety if accidental reverse bias occurs.
What is the maximum PCB trace length recommended between SMAJ45CA-13 and the protected IC?
To maintain effective clamping, PCB traces from SMAJ45CA-13 to the protected node should be as short and direct as possible - ideally ≤5 mm. Longer traces add inductance that increases voltage overshoot during fast transients; use ground-plane stitching and minimize loop area to preserve sub-1 ns response benefit.
Does SMAJ45CA-13 meet AEC-Q200 for automotive use?
No - SMAJ45CA-13 is not AEC-Q200 qualified. While it operates from –55°C to +150°C and withstands automotive-relevant surges, Diodes Incorporated does not list this specific variant under its AEC-Q200-certified TVS portfolio. For Q200-compliant designs, consider the Automotive-grade SMAJxxCA-Q series with explicit qualification documentation.
SMAJ45CA-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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- 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
SMAJ45CA-13 FAQ
1.How can I place an order for SMAJ45CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CA-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 SMAJ45CA-13 reliable?
The price and inventory of SMAJ45CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ45CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CA-13?
SMAJ45CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CA-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 SMAJ45CA-13?
For technical support, including SMAJ45CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CA-13 requirements.
6.How does Aetrix verify that SMAJ45CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ45CA-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 SMAJ45CA-13 meets industry standards.
7.What is the process for return or replacement of SMAJ45CA-13?
All SMAJ45CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CA-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 SMAJ45CA-13 part is unused and in its original packaging.
Return procedure for SMAJ45CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ45CA-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…
