My Inquiry
My Account
Taiwan Semiconductor Corporation SMAJ75CA
- Part No.:
- SMAJ75CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CA.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,241
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ75CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 75 V working stand-off voltage (VWM), 83.3–102 V breakdown voltage (VBR), 121 V maximum clamping voltage (VC) at 3.3 A peak impulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive infotainment power supplies and industrial I/O interfaces.
For engineers reviewing the SMAJ75CA datasheet, SMAJ75CA pinout, SMAJ75CA application, or SMAJ75CA equivalent, this device is evaluated for ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, moisture sensitivity level 1 handling, and DO-214AC (SMA) package integration in space-constrained PCB layouts requiring fast (<1.0 ps) response and low leakage (<1 µA at 75 V).
Technical Context
The SMAJ75CA implements a glass-passivated silicon junction optimized for bidirectional transient suppression. Its electrical symmetry ensures identical clamping behavior in both polarities, with guaranteed VBR min/max spread of 83.3–102 V at 1 mA test current and thermal derating above 25°C per Fig.2.
It operates across -55°C to +150°C junction temperature range and sustains 40 A non-repetitive forward surge (8.3 ms half-sine). The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for its DO-214AC molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 72–78 V nominal systems. |
| VBR @ IT=1 mA | 83.3–102 V - Breakdown onset range; ensures reliable triggering above system transients while avoiding false trips during normal operation. |
| VC @ IPPM=3.3 A | 121 V - Clamped voltage under 10/1000 µs surge; limits downstream IC stress to ≤121 V during 400 W transient events. |
| PPPM | 400 W - Peak pulse power handling (10/1000 µs); supports high-energy ESD and load-dump immunity in automotive-grade designs. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off; minimizes quiescent power loss and avoids interference in high-impedance sensing circuits. |
| Package | DO-214AC (SMA) - Surface-mount outline with 0.060 g mass; compatible with standard reflow profiles and automated placement equipment. |
| Standards | ISO 7637-2 (Pulse 1/2a/2b/3a/3b) - Validated for automotive electrical disturbance immunity; enables direct use in vehicle ECUs and body control modules. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; polarity indicated by single black band on cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient current sink (bidirectional) | Provides low-impedance path to ground or rail during positive or negative surges; symmetric conduction enables dual-polarity protection without external polarity logic. |
| Cathode (banded end) | Transient current sink (bidirectional) | Same functional role as anode due to bidirectional construction; terminal labeling follows conventional diode marking but does not imply unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure per J-STD-020 Level 1. |
| Sub-1 ps response time | Activates within <1.0 ps from 0 V to VBR min, enabling protection of high-speed interfaces and microcontroller I/O against nanosecond-scale ESD events. |
| 400 W peak pulse power (10/1000 µs) | Handles automotive load-dump transients up to 400 W without degradation; derates linearly above 25°C ambient per published curve. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive; eliminates brominated flame retardants and heavy metals for environmentally regulated production. |
| ISO 7637-2 certified | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling) - required for OEM automotive qualification. |
Applications
| Automotive Infotainment Power Rail | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 12 V supply input of head unit MCU and audio codec from battery load-dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt transients before LDO regulators. Use Value: Limits voltage excursion to ≤121 V during 400 W pulses, preserving 150°C-rated downstream components and meeting ISO 7637-2 Pulse 5a compliance. |
Use Scenario: Safeguarding 24 V digital input channels against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Standoff protection element mounted adjacent to optocoupler input, absorbing energy before signal conditioning circuitry. Use Value: Delivers <1 µA leakage at 24 V nominal, preventing false triggering while clamping 3.3 A transients to 121 V within 1 ps. |
| LED Driver Secondary-Side Output | Telecom PoE Interface Protection |
Use Scenario: Suppressing switching noise and lightning-induced surges on constant-current LED string outputs in streetlight drivers. IC Role / Device Role / Timing Role: Parallel-connected TVS across output terminals to clamp overshoot during MOSFET turn-off transitions. Use Value: Withstands 40 A surge current (8.3 ms half-sine), enabling robustness against repetitive inductive kickback in high-power LED arrays. |
Use Scenario: Guarding IEEE 802.3af/at Ethernet PHY ports against ESD and cable discharge events in network switches. IC Role / Device Role / Timing Role: First-line protection between RJ45 magnetics and PHY IC, placed before common-mode chokes. Use Value: Achieves <1.0 ps response and 121 V clamping, ensuring PHY ESD immunity exceeds IEC 61000-4-2 Level 4 (15 kV air/8 kV contact). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ75CA | Identical electrical specs, same DO-214AC package, and ISO 7637-2 certification; minor variation in VBR min (83.3 V vs. 83.5 V) and VC (121 V vs. 122 V). | No functional deviation; validated in identical automotive and industrial reference designs. | Drop-in replacement with full traceability and alternate sourcing option for supply chain resilience. |
| ON Semiconductor SMAJ75CA | Same VWM, VBR, and PPPM; differs in moisture sensitivity level (MSL 1 vs. MSL 2a) and RoHS documentation format. | Requires updated reflow profile validation for MSL 2a handling; otherwise functionally interchangeable in legacy board designs. | Preferred where ON Semi's quality reporting or regional distribution network offers logistical advantage. |
Compared with SMAJ75CA, the Littelfuse and ON Semiconductor alternatives provide identical clamping performance and package compatibility but differ in MSL rating and manufacturer-specific compliance documentation - making them suitable for second-source procurement without layout or firmware changes.
Availability
SMAJ75CA is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial programmable logic controllers, and LED driver power supplies requiring stable component supply with full ISO 7637-2 compliance and MSL Level 1 handling.
Supply support for SMAJ75CA 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu Science Park, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.
The SMAJ series was developed specifically for high-reliability automotive and industrial transient suppression, emphasizing fast response, low leakage, and standardized DO-214AC packaging for automated manufacturing scalability.
FAQ
What is the maximum clamping voltage of SMAJ75CA under a 10/1000 µs surge?
The SMAJ75CA has a maximum clamping voltage (VC) of 121 V when subjected to a 3.3 A peak impulse current with a 10/1000 µs waveform. This value is measured per standard test conditions in the Taiwan Semiconductor datasheet and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ75CA maintains this clamping performance across its full operating temperature range.
Is SMAJ75CA unidirectional or bidirectional, and how is polarity identified?
SMAJ75CA is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients. Polarity is marked with a single cathode band on one end, but unlike unidirectional devices, this marking does not restrict conduction direction - the SMAJ75CA functions identically in either orientation. This simplifies layout and eliminates polarity-dependent placement errors.
Does SMAJ75CA meet automotive EMC standards such as ISO 7637-2?
Yes, SMAJ75CA is explicitly rated to meet ISO 7637-2 for Pulse 1, 2a, 2b, 3a, and 3b waveforms - covering key automotive transients including load dump, battery disconnect, and capacitive coupling. This certification is documented in the Taiwan Semiconductor U2102 datasheet and enables direct use in Tier 1 automotive subsystems without additional qualification testing.
What is the moisture sensitivity level (MSL) and reflow profile guidance for SMAJ75CA?
SMAJ75CA has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions without baking prior to reflow. Its DO-214AC package supports standard lead-free reflow profiles with peak temperatures up to 260°C, and its matte tin-plated leads comply with J-STD-002 solderability requirements.
How does SMAJ75CA compare to SMAJ75A in terms of breakdown voltage and clamping performance?
SMAJ75CA has a VBR range of 83.3–102 V and VC = 121 V, while SMAJ75A specifies VBR = 83.3–92.1 V and VC = 134 V. The "C" suffix denotes bidirectional construction and tighter VBR consistency, whereas the "A" variant offers lower clamping but narrower breakdown tolerance. SMAJ75CA is preferred where symmetrical protection and predictable turn-on are critical.
SMAJ75CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- 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:
- DO-214AC (SMA)
SMAJ75CA FAQ
1.How can I place an order for SMAJ75CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CA 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 SMAJ75CA reliable?
The price and inventory of SMAJ75CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75CA is usually 5 days.
3.What payment methods are accepted for SMAJ75CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CA?
SMAJ75CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CA 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 SMAJ75CA?
For technical support, including SMAJ75CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CA requirements.
6.How does Aetrix verify that SMAJ75CA is sourced from the original manufacturer or authorized distributors?
All SMAJ75CA 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 SMAJ75CA meets industry standards.
7.What is the process for return or replacement of SMAJ75CA?
All SMAJ75CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CA, 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 SMAJ75CA part is unused and in its original packaging.
Return procedure for SMAJ75CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ75CA 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
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
