My Inquiry
My Account
Taiwan Semiconductor Corporation SMAJ8.0CH
- Part No.:
- SMAJ8.0CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0CH.pdf
- Description:
- 400W, 9.9V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,179
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ8.0CH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade overvoltage protection in DC power rails. It features a 8.0V working stand-off voltage (VWM), 8.89–10.90V breakdown voltage (VBR) at 1mA test current, and clamps to ≤15.0V at 50A peak impulse current under 10/1000μs waveform - deployed in on-board DC/DC converters and SMPS input stages.
For engineers reviewing the SMAJ8.0CH datasheet, SMAJ8.0CH pinout, SMAJ8.0CH application, or SMAJ8.0CH equivalent, this device serves as a qualified AEC-Q101 TVS for ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, with DO-214AC (SMA) package, glass-passivated junction, and <1.0ps response time - critical for robust ESD and load-dump immunity in automotive electronics.
Technical Context
The SMAJ8.0CH operates as a unidirectional avalanche diode with cathode-band polarity marking, optimized for fast clamping of transients on positive-rail DC lines. Its 150°C maximum junction temperature and -55°C to +150°C operating range support under-hood automotive environments.
It delivers 400W peak pulse power (10/1000μs) up to 78V VWM; above that, rating drops to 300W. With <1μA reverse leakage at 8V and 3.5V max forward voltage at 25A, it minimizes standby loss while sustaining 40A non-repetitive surge current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 8.89 V / 10.90 V at 1 mA - Confirmed avalanche onset range ensures reliable triggering before system damage |
| VC @ IPPM | 15.0 V at 50 A - Clamping voltage limits downstream IC stress during ISO 7637-2 load dump events |
| PPPM | 400 W (10/1000μs) - Sustains high-energy transients common in 12V automotive systems |
| IR @ VWM | <1 μA - Negligible leakage preserves battery life in always-on vehicle modules |
| Response time | <1.0 ps - Sub-picosecond junction response enables protection of high-speed logic and MCU I/O |
| TJ max | +150 °C - Supports placement near heat-generating components in engine control units |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line (e.g., +12V rail) | Connected to source of transient energy; carries full surge current during clamping |
| Cathode | Clamp reference node (typically GND or low-side return) | Provides low-impedance path to ground when VAK exceeds VBR; marked by band on package |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and mechanical shock per JEDEC standards |
| Glass passivated junction | Enhances long-term reliability and humidity resistance vs. epoxy-passivated alternatives |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) requirements |
| UL 94V-0 molding compound | Self-extinguishing encapsulation prevents flame propagation in enclosed automotive enclosures |
| JESD 201 Class 2 whisker resistance | Eliminates tin whisker risk in high-reliability 15+ year automotive deployments |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Power Input Stage |
|---|---|
Use Scenario: Protecting microcontroller supply rails against load dump and jump-start transients in door module ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused battery feed and LDO input to clamp spikes before regulation. Use Value: Limits voltage to ≤15.0 V during 400W pulses, preventing brownout or latch-up in 3.3V/5V logic domains. |
Use Scenario: Safeguarding 24V DC input of programmable logic controller against field-wiring induced surges. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on DIN-rail mounted power entry board. Use Value: Withstands 40A surge current and maintains <1μA leakage, enabling stable operation in factory-floor EMI environments. |
| LED Headlamp Driver Supply | Automotive Infotainment USB Power Rail |
Use Scenario: Shielding buck converter input in adaptive LED headlamps from alternator ripple and ignition noise. IC Role / Device Role / Timing Role: Fast-response clamping device on 12V input prior to DC/DC stage, sized for 10/1000μs threats. Use Value: Sub-1ps response ensures suppression occurs before sensitive gate drivers experience overvoltage stress. |
Use Scenario: Secondary protection on 5V USB VBUS line in head unit, supplementing primary ESD array. IC Role / Device Role / Timing Role: High-power backup suppressor handling sustained transients beyond ESD diode capability. Use Value: 15.0V clamping voltage aligns with USB 2.0 specification limits, preserving data integrity during hot-swap events. |
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 SMAJ8.0AHE3/5A | Same DO-214AC package; tighter VBR tolerance (8.89–9.83V); 13.6V clamping at 50A | Lower clamping voltage suits systems with tighter 5V rail margins | Select when lower VC is prioritized over cost; identical footprint and AEC-Q101 status |
| ON Semiconductor SMAJ8.0A | VBR 8.89–9.83V; VC = 13.6V @ 50A; same 400W rating but RoHS/halogen-free compliance varies by batch | Preferred where legacy ON Semi BOM alignment is required | Verify halogen-free and JESD 201 whisker test documentation per lot; otherwise functionally interchangeable |
Compared with SMAJ8.0CH, the Littelfuse SMAJ8.0AHE3/5A offers lower clamping (13.6V vs. 15.0V) for tighter voltage margins, while the ON Semi SMAJ8.0A matches electrical specs but requires batch-specific compliance validation - both retain DO-214AC compatibility and AEC-Q101 qualification.
Availability
SMAJ8.0CH is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power inputs, LED lighting drivers, and infotainment USB power rails requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SMAJ8.0CH 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 12V/24V automotive subsystems, emphasizing robustness against ISO 7637-2 pulses and long-term reliability under thermal cycling.
FAQ
What is the polarity configuration of the SMAJ8.0CH?
The SMAJ8.0CH is a unidirectional TVS diode with cathode-band marking indicating the cathode terminal. It conducts only when anode-to-cathode voltage exceeds the breakdown threshold (8.89–10.90V), making it suitable for protecting positive DC rails referenced to ground. This differs from bidirectional variants like SMAJ8.0C, which lack polarity marking and protect AC or dual-polarity signals.
Does the SMAJ8.0CH meet AEC-Q101 requirements for automotive use?
Yes, the SMAJ8.0CH is explicitly qualified to AEC-Q101 Rev D for stress tests including HTGB, H3TRB, TC, and mechanical shock. Its construction - glass-passivated junction, UL 94V-0 molding, and JESD 201 Class 2 whisker resistance - satisfies automotive reliability requirements for under-hood and cabin modules with 15+ year service life expectations.
What is the maximum clamping voltage of the SMAJ8.0CH under standard test conditions?
The SMAJ8.0CH clamps to a maximum of 15.0 V at 50 A peak impulse current using the industry-standard 10/1000μs double-exponential waveform. This value is measured per Fig.5 in the datasheet and defines the upper voltage limit imposed on protected circuitry during transient events such as load dump or inductive switching.
Can the SMAJ8.0CH be used in bidirectional signal protection applications?
No - the SMAJ8.0CH is unidirectional and must not be used for AC or bipolar signal lines. For bidirectional protection, select SMAJ8.0C (cathode-less marking, symmetrical breakdown in both directions). Using SMAJ8.0CH in reverse-biased AC configurations risks premature failure due to lack of reverse conduction capability.
What packaging and reel quantity is available for the SMAJ8.0CH?
The SMAJ8.0CH ships in DO-214AC (SMA) package on 7,500-piece tape-and-reel format per standard ordering code SMAJ8.0CH. Tape meets EIA-481-D specifications, and reels are compatible with automated pick-and-place equipment operating at speeds up to 25,000 cph, supporting high-volume automotive PCB assembly.
SMAJ8.0CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 15V
- Current - Peak Pulse (10/1000µs):
- 26.7A
- 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)
SMAJ8.0CH FAQ
1.How can I place an order for SMAJ8.0CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0CH 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 SMAJ8.0CH reliable?
The price and inventory of SMAJ8.0CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.0CH is usually 5 days.
3.What payment methods are accepted for SMAJ8.0CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0CH?
SMAJ8.0CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0CH 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 SMAJ8.0CH?
For technical support, including SMAJ8.0CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0CH requirements.
6.How does Aetrix verify that SMAJ8.0CH is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0CH 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 SMAJ8.0CH meets industry standards.
7.What is the process for return or replacement of SMAJ8.0CH?
All SMAJ8.0CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0CH, 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 SMAJ8.0CH part is unused and in its original packaging.
Return procedure for SMAJ8.0CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.0CH 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…
