My Inquiry
My Account
Diodes Incorporated SMAJ45CA-13-F
- Part No.:
- SMAJ45CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CA-13-F.pdf
- Description:
- TVS DIODE 45VWM 72.7VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:162,401
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ45CA-13-F from Diodes Incorporated is a bidirectional 400W surface-mount transient voltage suppressor (TVS) diode 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 at 5.5A peak pulse current, and SMA package with glass-passivated die construction for robust reliability in automotive and industrial environments.
For engineers reviewing the SMAJ45CA-13-F datasheet, SMAJ45CA-13-F pinout, SMAJ45CA-13-F application, or SMAJ45CA-13-F equivalent, key selection criteria include clamping voltage margin relative to system operating voltage, unidirectional vs. bidirectional polarity requirements for AC-coupled or differential signal lines, IEC 61000-4-2/4-5 compliance readiness, and thermal derating above +25°C ambient.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC signals, RS-485 buses, and Ethernet PHY interfaces without polarity constraints. Its 1.0mA test current ensures stable breakdown voltage measurement, while 5.0µA max reverse leakage at VRWM minimizes standby power impact in battery-powered systems.
The device uses a planar junction structure with glass passivation for high surge robustness and low capacitance (typically <100pF at 1MHz), making it suitable for high-speed data line protection where signal integrity must be preserved during transient events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - Sustains single 10/1000µs surge events without failure under defined thermal conditions. |
| Reverse Standoff Voltage | 45V - Maximum continuous DC or RMS voltage the device blocks before entering avalanche conduction. |
| Clamping Voltage | 72.7V @ 5.5A - Voltage seen by protected circuit during worst-case 8.3ms half-sine surge; defines overvoltage stress limit. |
| Breakdown Voltage | 50.0–55.3V @ 1.0mA - Confirmed avalanche onset range; ensures reliable triggering above system operating voltage. |
| Leakage Current | ≤5.0µA @ 45V - Negligible DC loading on 45V supply rails or high-impedance sensor inputs. |
| Package | SMA - Standard surface-mount outline (4.0–4.6mm length, 2.29–2.92mm width) compatible with automated PCB assembly. |
Pinout & Package
Package: SMA (Surface Mount Assembly), molded plastic case per UL 94V-0, cathode band omitted due to bidirectional configuration. Weight: 0.064g. Moisture sensitivity level: J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals function identically; no polarity marking required-enables placement flexibility on AC or differential lines. |
| Case (body) | Thermal mass / mechanical anchor | Plastic body provides insulation and heat dissipation path to PCB copper; no electrical connection. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4kV line-earth, 2kV line-line) when properly laid out with low-inductance traces. |
| Glass-passivated die | Eliminates surface contamination risks and improves long-term stability under humidity and temperature cycling. |
| Bidirectional operation | Protects both positive and negative transients on balanced interfaces like CAN FD, RS-485, or audio lines without external polarity logic. |
| RoHS 3 & Halogen-free | Complies with EU Directive 2015/863/EU and Diodes' "Green" standard (<900ppm Br, <900ppm Cl, <1000ppm Sb). |
Applications
| Automotive Infotainment Display Interface | Industrial RS-485 Field Bus Node |
|---|---|
Use Scenario: Protecting LVDS or FPD-Link III video data lines between head unit and TFT display against load dump and ESD events in vehicles. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector entry point to clamp ±15kV contact ESD and 100V/100ms transients without distorting high-speed video signals. Use Value: Sub-100pF capacitance preserves signal integrity up to 1.5Gbps; 72.7V clamping ensures display driver ICs (rated to 60V abs max) remain within safe operating area. | Use Scenario: Safeguarding RS-485 transceivers in factory automation PLC I/O modules exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary surge suppression element on A/B differential pair, coordinated with common-mode chokes to meet IEC 61000-4-5 Level 3 (2kV line-earth). Use Value: 400W rating enables single-device protection without parallel staging; bidirectional symmetry eliminates need for dual unidirectional devices or polarity-aware layout. |
| Medical Patient Monitor ECG Input Stage | Smart Energy Meter Communication Port |
Use Scenario: Shielding isolated analog front-end of ECG amplifier from defibrillator discharge pulses and hospital-grade ESD. IC Role / Device Role / Timing Role: First-line transient barrier on patient-connected leads, placed before isolation barrier to prevent energy coupling into sensitive analog circuitry. Use Value: 5.0µA leakage avoids DC offset errors in µV-level biopotential measurements; 45V VRWM aligns with typical ±20V input range of instrumentation amplifiers. | Use Scenario: Securing HPLC or PLC communication ports (M-Bus, DLMS) in utility meters installed in outdoor substations subject to induced surges. IC Role / Device Role / Timing Role: Secondary protection stage downstream of gas discharge tube (GDT), clamping residual let-through voltage to safe levels for microcontroller UART pins. Use Value: 72.7V clamping ensures MCU I/O (3.3V or 5V tolerant) sees no more than 2× its VDD+0.5V absolute max rating during surge decay phase. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA from Vishay (SMAJ45CA-E3/5A) | Identical VRWM (45V), clamping voltage (72.7V), and package; slightly higher PPK tolerance (420W) but same 400W rated curve. | No functional difference in circuit design; identical footprint and solder profile. | Select for multi-source procurement or when Vishay's AEC-Q200-qualified variant (SMAJ45CAQ) is required for automotive PPAP. |
| P6SMB45CA from ON Semiconductor | Same 45V VRWM and bidirectional configuration, but SMB package (larger footprint, 4.6 × 3.95mm vs SMA's 4.6 × 2.92mm); 600W peak power rating. | Requires PCB layout change; higher power handling suits higher-energy surge environments but increases board area. | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 or when thermal margin demands larger thermal mass. |
Compared with SMAJ45CA-13-F, the Vishay alternative offers identical electrical behavior and drop-in compatibility, while the ON Semiconductor part trades compactness for higher surge capacity-making the Diodes device optimal for space-constrained, cost-sensitive designs meeting standard industrial surge immunity requirements.
Availability
SMAJ45CA-13-F is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial RS-485 networks, and medical patient monitoring equipment requiring stable component supply and consistent surge performance across production batches.
Supply support for SMAJ45CA-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, manufacturing, and sales operations across Asia, Europe, and North America.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability board-level ESD and surge protection in automotive, industrial, and communications infrastructure applications.
FAQ
What is the meaning of the 'C' suffix in SMAJ45CA-13-F?
The 'C' denotes bidirectional configuration, meaning the device clamps transients of either polarity symmetrically across its terminals. Unlike unidirectional variants (e.g., SMAJ45A), it has no cathode band and functions identically regardless of voltage polarity-essential for protecting AC-coupled or differential signal lines such as RS-485 or CAN.
Can SMAJ45CA-13-F be used in place of a unidirectional TVS in a DC power rail?
Yes, but with reduced efficiency: bidirectional devices exhibit higher leakage current under DC bias compared to unidirectional types rated for the same VRWM. For a 45V DC rail, SMAJ45CA-13-F draws ≤5.0µA, which is acceptable in most cases-but unidirectional SMAJ45A would draw ≤5.0µA only in reverse bias and conduct freely in forward direction, offering better DC blocking if polarity is fixed.
What is the maximum allowable PCB trace inductance for effective clamping performance?
To maintain clamping voltage within specification during fast transients (e.g., 8/20µs), total series inductance-including PCB traces, vias, and internal bond wires-must be kept below 10nH. This typically requires short (<5mm), wide (≥0.5mm), direct routing from protected line to TVS terminal, with ground plane underneath and minimal via count to minimize impedance rise during nanosecond-scale current slew.
Does SMAJ45CA-13-F meet AEC-Q200 qualification for automotive use?
No-the standard SMAJ45CA-13-F is not AEC-Q200 qualified. Diodes offers an automotive-compliant version under separate datasheet: SMAJ45CAQ-13-F, which undergoes additional stress testing (temperature cycling, humidity bias, mechanical shock) and is manufactured in IATF 16949-certified facilities with full PPAP documentation support.
SMAJ45CA-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):
- 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-F FAQ
1.How can I place an order for SMAJ45CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CA-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 SMAJ45CA-13-F reliable?
The price and inventory of SMAJ45CA-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 SMAJ45CA-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ45CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CA-13-F?
SMAJ45CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CA-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 SMAJ45CA-13-F?
For technical support, including SMAJ45CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CA-13-F requirements.
6.How does Aetrix verify that SMAJ45CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ45CA-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 SMAJ45CA-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ45CA-13-F?
All SMAJ45CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CA-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 SMAJ45CA-13-F part is unused and in its original packaging.
Return procedure for SMAJ45CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ45CA-13-F 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…
