My Inquiry
My Account
Taiwan Semiconductor Corporation SMAJ110C
- Part No.:
- SMAJ110C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ110C.pdf
- Description:
- 300W, 135.5V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,367
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ110C from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 110V working stand-off voltage (VWM), 122–149V breakdown voltage (VBR @ 1mA), and clamps to ≤196V at 1.6A peak impulse current under 10/1000μs waveform - ideal for protecting automotive ECUs and industrial SMPS inputs.
For engineers reviewing the SMAJ110C datasheet, SMAJ110C pinout, SMAJ110C application, or SMAJ110C equivalent, key selection criteria include its unidirectional polarity, 150°C junction rating, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1μA @ 110V), and fast <1.0ps response time - critical for high-reliability 12V/24V system surge immunity.
Technical Context
The SMAJ110C operates as a unidirectional avalanche diode with glass-passivated junction, enabling precise voltage clamping during transient events. Its electrical behavior follows standard TVS I-V characteristics: low leakage below VWM, sharp transition into conduction at VBR, and stable clamping voltage (VC) up to 196V at rated IPPM.
It is rated for 400W peak pulse power (10/1000μs), derated linearly above 25°C ambient per Fig.2, and supports 40A non-repetitive forward surge (8.3ms half-sine). Polarity is marked by cathode band; terminals are matte tin-plated for J-STD-002 solderability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 110 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 12V/24V systems. |
| VBR min/max | 122 V / 149 V @ 1 mA - Verified breakdown range ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | ≤196 V @ 1.6 A - Clamping voltage limits downstream IC stress during ISO 7637-2 Pulse 1 (inductive load dump) events. |
| PPPM | 400 W (10/1000μs) - Sustains high-energy transients without thermal runaway; derates to ~300W above 78V per spec. |
| IR @ VWM | <1 μA - Negligible standby leakage preserves battery life in always-on automotive modules. |
| TJ max | +150 °C - Enables placement near hot components (e.g., MOSFETs, inductors) in compact power designs. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Case meets UL 94V-0; weight ≈0.060g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; forms clamping loop with cathode on protected line. |
| Cathode | High-side connection point | Connected to protected DC rail (e.g., +12V input); cathode band identifies polarity for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Fast response time <1.0 ps | Clamps ESD and fast-rising transients (e.g., relay bounce, inductive kick) before sensitive ICs experience overstress. |
| ISO 7637-2 compliance | Validated for automotive-grade surge immunity including Pulse 1 (load dump simulation), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupled noise). |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow; compatible with standard SMT assembly processes without floor-life constraints. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protects microcontroller power supply against load-dump transients (ISO 7637-2 Pulse 1) during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V rail and chassis ground to clamp surges up to 120V. Use Value: Limits peak voltage to ≤196V, preventing damage to 3.3V/5V LDOs and CAN transceivers downstream. | Use Scenario: Shields isolated flyback converter primary-side controller from reflected switching spikes and line surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24V–48V input bus, absorbing repetitive 10/1000μs transients from motor drives or PLC outputs. Use Value: Maintains <1μA leakage at 110V, avoiding unnecessary quiescent current draw in energy-sensitive systems. |
| LED Driver Power Stage | Telecom Power Supply Input |
Use Scenario: Guards constant-current LED driver ICs from inductive turn-off spikes generated by high-side MOSFET switching. IC Role / Device Role / Timing Role: Fast-clamping unidirectional TVS placed across input capacitor to absorb sub-microsecond voltage overshoots. Use Value: Sub-1ps response ensures clamping initiates before driver IC gate oxide breakdown occurs. | Use Scenario: Provides secondary-side surge protection on -48V telecom rectifier output feeding backplane distribution. IC Role / Device Role / Timing Role: High-reliability TVS selected for extended temperature operation (-55°C to +150°C) in outdoor cabinets. Use Value: 150°C TJ rating allows uninterrupted operation in sealed enclosures with minimal airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ110A | Bidirectional variant; symmetric clamping in both polarities; VBR = 122–135V; same VC = 177V @ 1.7A. | Required where AC-coupled signals or reversible polarity interfaces need protection (e.g., RS-485, CAN FD lines). | Select SMAJ110A only if bidirectional clamping is explicitly required; SMAJ110C is optimal for DC rail protection with defined polarity. |
| SMBJ110C | Same electrical specs but in larger DO-214AA (SMB) package; 600W PPPM; higher thermal mass; 0.13g weight. | Better suited for high-volume industrial power supplies needing enhanced surge margin or manual rework capability. | Choose SMBJ110C when board space permits and higher pulse power headroom (>400W) is needed; SMAJ110C fits tighter layouts with identical clamping performance. |
Compared with SMAJ110A and SMBJ110C, the SMAJ110C offers optimized cost, size, and thermal performance for unidirectional DC rail protection - delivering full 400W surge handling in the smallest standard SMA footprint without compromising leakage or response time.
Availability
SMAJ110C is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, LED driver power stages, and telecom power supply inputs requiring stable component supply across extended temperature and surge conditions.
Supply support for SMAJ110C 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, MOSFETs, and power management devices.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, tight VBR tolerance, and robust packaging for automated SMT assembly.
FAQ
What is the polarity configuration of SMAJ110C?
The SMAJ110C is a unidirectional TVS diode, meaning it conducts only when the cathode is positive relative to the anode. Its cathode is marked by a visible band on the DO-214AC (SMA) package body. This configuration provides asymmetric clamping - ideal for protecting DC power rails where polarity is fixed and reverse-voltage events are not expected.
Does SMAJ110C meet automotive surge immunity standards?
Yes, SMAJ110C meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling noise). Its 400W peak pulse rating, fast <1.0ps response, and verified clamping performance at 1.6A make it suitable for front-end protection in automotive ECUs, body control modules, and infotainment power supplies.
What is the maximum clamping voltage of SMAJ110C under surge conditions?
The maximum clamping voltage (VC) of SMAJ110C is 196 V when subjected to its rated peak impulse current of 1.6 A using the standardized 10/1000μs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components see no more than 196 V during worst-case transients.
Can SMAJ110C be used in place of SMAJ110A?
No - SMAJ110C and SMAJ110A are not interchangeable without circuit review. SMAJ110C is unidirectional; SMAJ110A is bidirectional. Substituting SMAJ110C for SMAJ110A in AC or polarity-agnostic circuits will result in incomplete protection. Always verify signal polarity and clamping symmetry requirements before replacement.
What is the junction temperature limit and thermal derating behavior of SMAJ110C?
SMAJ110C has a maximum junction temperature (TJ) of +150°C and is rated for continuous operation from –55°C to +150°C. Its peak pulse power de-rates linearly above 25°C ambient per Figure 2 in the datasheet; at 85°C ambient, usable PPPM drops to approximately 280W for 10/1000μs pulses - a critical consideration for high-temperature enclosure designs.
SMAJ110C 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):
- 110V
- Voltage - Breakdown (Min):
- 122V
- Voltage - Clamping (Max) @ Ipp:
- 196V
- Current - Peak Pulse (10/1000µs):
- 1.6A
- 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)
SMAJ110C FAQ
1.How can I place an order for SMAJ110C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ110C 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 SMAJ110C reliable?
The price and inventory of SMAJ110C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ110C is usually 5 days.
3.What payment methods are accepted for SMAJ110C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ110C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ110C?
SMAJ110C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ110C 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 SMAJ110C?
For technical support, including SMAJ110C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ110C requirements.
6.How does Aetrix verify that SMAJ110C is sourced from the original manufacturer or authorized distributors?
All SMAJ110C 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 SMAJ110C meets industry standards.
7.What is the process for return or replacement of SMAJ110C?
All SMAJ110C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ110C, 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 SMAJ110C part is unused and in its original packaging.
Return procedure for SMAJ110C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ110C 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…
