My Inquiry
My Account
Taiwan Semiconductor Corporation SMAJ75H
- Part No.:
- SMAJ75H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75H.pdf
- Description:
- TVS DIODE 75VWM 134VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,360
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ75H from Taiwan Semiconductor is a unidirectional 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), 134 V maximum clamping voltage (VC) at 3.0 A peak impulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive-grade SMPS, on-board DC/DC converters, and lighting control circuits.
For engineers reviewing the SMAJ75H datasheet, SMAJ75H pinout, SMAJ75H application, or SMAJ75H equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, AEC-Q101 qualification status, DO-214AC (SMA) package compatibility with automated placement, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMAJ75H operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-1 ps response time from 0 V to VBR(min). Its clamping behavior is defined by a single-die DO-214AC structure with cathode band polarity marking and matte tin-plated leads compliant with J-STD-002 solderability.
It delivers 134 V clamping at 3.0 A (10/1000 µs), with <1 µA reverse leakage at 75 V and a maximum junction temperature of +150 °C. The device meets moisture sensitivity level 1 (J-STD-020) and supports automotive ESD immunity per ISO 7637-2 without external biasing or control circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR @ IT = 1 mA | 83.3–102 V - Breakdown threshold range ensuring reliable turn-on during transients |
| VC @ IPPM = 3.0 A | 134 V - Clamped voltage seen by protected circuit during 10/1000 µs surge |
| PPPM | 400 W - Peak surge power dissipation capability per standard 10/1000 µs waveform |
| IR @ VWM | <1 µA - Minimal leakage current preserving efficiency in low-power standby states |
| TJ(max) | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.060 g mass and JESD201 Class 2 whisker resistance |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case rated UL 94V-0, matte tin-plated leads, cathode indicated by band marking. Polarity must be observed during PCB layout to ensure unidirectional clamping functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line; conducts only when cathode-to-anode voltage exceeds VBR |
| Cathode | Ground/Return side | Marked by band; ties to system ground or low-impedance return path to shunt surge energy |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under thermal/humidity stress |
| Fast response time <1 ps | Enables suppression before sensitive downstream ICs experience overvoltage damage |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained applications |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protection of 12 V/24 V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and input stage of power management IC. Use Value: Limits voltage to ≤134 V during ISO 7637-2 Pulse 5a (load dump), preventing latch-up or gate oxide rupture in downstream regulators. |
Use Scenario: Input-side surge suppression in isolated 48 V-to-12 V buck-boost converters for factory automation. IC Role / Device Role / Timing Role: Primary overvoltage guard on high-side input rail prior to primary MOSFET and controller. Use Value: Absorbs 400 W transient energy without degradation, maintaining converter uptime during field-induced surges. |
| LED Driver Modules | Telecom Power Interfaces |
Use Scenario: Transient protection for constant-current LED drivers in streetlight systems exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver input terminals to clamp induced line-to-ground spikes. Use Value: Clamps to 134 V within <1 ps, preventing premature LED string failure and driver IC damage during outdoor surge events. |
Use Scenario: Secondary-side protection on 48 V telecom power feeds entering base station control boards. IC Role / Device Role / Timing Role: Standoff-rated TVS on -48 V return path to suppress common-mode noise and fast-rising EFT bursts. Use Value: Maintains <1 µA leakage at 75 V, avoiding false triggering while delivering 134 V clamping for EN 61000-4-4 compliance. |
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 SMAJ75A | Bi-directional configuration; symmetric VBR (83.3–92.1 V); same DO-214AC package and 134 V clamping | Required where bidirectional surge protection (e.g., AC-coupled data lines or floating rails) is needed | Select SMAJ75A only if polarity-agnostic clamping is required; SMAJ75H is preferred for DC rail protection with defined ground reference |
| Vishay SMAJ75 | Unidirectional; identical VWM/VBR/VC specs but rated for 300 W above 78 V (vs. 400 W for Taiwan Semi) | Acceptable for lower-energy transients; not recommended for full ISO 7637-2 Pulse 5a compliance at full severity | Verify pulse derating curves - Vishay SMAJ75 may require parallel devices or higher VWM grade for equivalent 400 W capability |
Compared with Littelfuse SMAJ75A and Vishay SMAJ75, the SMAJ75H provides guaranteed 400 W peak pulse power at 75 V standoff, AEC-Q101 qualification out-of-box, and tighter VBR tolerance (83.3–102 V vs. 83.3–92.1 V), making it optimal for automotive and industrial DC power rail protection where unidirectional clamping and full-spec surge margin are critical.
Availability
SMAJ75H is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converters, LED driver modules, and telecom power interfaces requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for SMAJ75H 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, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs for automotive and industrial markets.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in harsh-environment DC power systems, emphasizing glass-passivated reliability, fast clamping, and standardized DO-214AC manufacturability.
FAQ
What is the clamping voltage of SMAJ75H at its rated peak pulse current?
The SMAJ75H has a maximum clamping voltage (VC) of 134 V when subjected to its rated peak impulse current of 3.0 A under the standard 10/1000 µs waveform. This value is measured per Figure 5 in the official Taiwan Semiconductor datasheet (Version A2102) and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMAJ75H AEC-Q101 qualified and what tests does that cover?
Yes, SMAJ75H is AEC-Q101 qualified. This certification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, highly accelerated stress test (HAST), and electrostatic discharge (ESD) per human-body model (HBM) and machine model (MM), confirming suitability for automotive electronic control units and power modules.
Does SMAJ75H support bidirectional transient suppression?
No, SMAJ75H is a unidirectional TVS diode. Its cathode band marking indicates polarity-sensitive operation - it clamps only when the cathode is at higher potential than the anode. For bidirectional protection, the SMAJ75AH variant (marked RR) or Littelfuse SMAJ75A should be selected instead.
What is the maximum steady-state power dissipation rating for SMAJ75H?
The SMAJ75H has a steady-state power dissipation (PD) rating of 1 W at TA = 25 °C. This value applies to continuous DC or low-frequency AC conditions and is distinct from its 400 W peak pulse power rating, which is valid only for non-repetitive 10/1000 µs transients.
How does SMAJ75H meet ISO 7637-2 compliance?
SMAJ75H meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) requirements due to its 134 V clamping voltage, sub-1 ps response time, and 400 W peak pulse power handling - verified through standardized surge generator testing per the specification's waveform definitions.
SMAJ75H 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 134V
- Current - Peak Pulse (10/1000µs):
- 3A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ75H FAQ
1.How can I place an order for SMAJ75H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75H 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 SMAJ75H reliable?
The price and inventory of SMAJ75H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75H is usually 5 days.
3.What payment methods are accepted for SMAJ75H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75H?
SMAJ75H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75H 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 SMAJ75H?
For technical support, including SMAJ75H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75H requirements.
6.How does Aetrix verify that SMAJ75H is sourced from the original manufacturer or authorized distributors?
All SMAJ75H 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 SMAJ75H meets industry standards.
7.What is the process for return or replacement of SMAJ75H?
All SMAJ75H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75H, 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 SMAJ75H part is unused and in its original packaging.
Return procedure for SMAJ75H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ75H 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
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
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 …
