My Inquiry
My Account
Taiwan Semiconductor Corporation SMAJ48CA
- Part No.:
- SMAJ48CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CA.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ48CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 48 V working stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR @ 1 mA), and clamps to ≤77.4 V at 5.2 A peak impulse current under 10/1000 µs waveform, delivering 400 W peak pulse power.
For engineers reviewing the SMAJ48CA datasheet, SMAJ48CA pinout, SMAJ48CA application, or SMAJ48CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1 µA @ 48 V), and DO-214AC surface-mount compatibility for automotive and industrial power supply protection.
Technical Context
The SMAJ48CA employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps rise time from 0 V to VBR min) and stable clamping performance across -55 °C to +150 °C junction temperature range. Its bidirectional configuration enables symmetric protection without polarity sensitivity, supporting both positive and negative transients on the same line.
It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, with matte tin-plated leads solderable per J-STD-002. The device is rated for 40 A non-repetitive forward surge (8.3 ms half-sine) and operates with <1 µA reverse leakage at VWM, ensuring minimal standby power impact in always-on systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous DC or RMS voltage the device blocks without clamping |
| VBR min/max | 53.3 V / 58.9 V @ 1 mA - Confirmed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | ≤77.4 V @ 5.2 A - Clamping voltage limiting downstream component stress during 10/1000 µs surge |
| PPPM | 400 W - Peak pulse power handling capacity per single 10/1000 µs transient event |
| IR @ VWM | <1 µA - Negligible reverse leakage current preserving signal integrity and efficiency |
| TJ max | +150 °C - Maximum junction temperature enabling operation in high-ambient environments like engine bays |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with 0.060 g mass and J-STD-020 Level 1 moisture sensitivity |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; dual axial leads, RoHS-compliant and halogen-free per IEC 61249-2-21.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient current entry point (bidirectional) | Accepts positive or negative surge energy equally; no polarity dependency in circuit layout |
| Cathode (banded end) | Transient current exit point (bidirectional) | Paired with anode to form symmetrical clamping path; band denotes terminal orientation only, not unidirectional function |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating DC lines without external polarity management |
| ISO 7637-2 compliance | Validated against automotive load-dump and inductive-switching transients (Pulse 1/2a/2b/3a/3b) |
| Fast response time | <1.0 ps from 0 V to VBR min ensures suppression before sensitive ICs experience overvoltage damage |
| Low clamping ratio (VC/VBR) | ~1.32 (77.4 V / 58.9 V) indicates efficient voltage limiting with minimal margin above breakdown |
| Surface-mount automation readiness | DO-214AC footprint supports high-speed pick-and-place assembly and reflow soldering per J-STD-002 |
Applications
| Automotive Infotainment Power Rail | Industrial PLC I/O Module |
|---|---|
Use Scenario: Protecting 48 V CAN-FD or Ethernet PHY power inputs from load dump and alternator ripple in vehicle head units. IC Role / Device Role / Timing Role: Bidirectional TVS placed upstream of DC/DC converter input to clamp transients before regulation stage. Use Value: Maintains system uptime by preventing latch-up or burnout of PMICs during ISO 7637-2 Pulse 5a events up to 400 W. | Use Scenario: Safeguarding 24–48 V digital input channels in programmable logic controllers exposed to field-wiring inductive kickback. IC Role / Device Role / Timing Role: Primary overvoltage clamp on sensor/actuator interface lines, operating alongside series current-limiting resistors. Use Value: Limits transient voltage to ≤77.4 V, keeping input logic within safe operating area of 3.3 V or 5 V microcontrollers. |
| LED Streetlight Driver | Telecom DC Power Distribution |
Use Scenario: Input-stage protection for constant-current LED drivers subjected to lightning-induced surges on outdoor 48 V DC distribution lines. IC Role / Device Role / Timing Role: First-line transient suppressor at AC/DC rectifier output or DC bus entry point. Use Value: Absorbs 400 W pulses without degradation, extending driver lifetime in harsh outdoor environments per IEC 61000-4-5 Level 4. | Use Scenario: Secondary-side surge protection on 48 V backplane feeds powering remote radio units and baseband processing cards. IC Role / Device Role / Timing Role: Localized clamping device adjacent to hot-swap controllers and POL regulators. Use Value: Provides <1 µA leakage at 48 V, avoiding false triggering of undervoltage lockout while maintaining fast 10/1000 µs response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA (Bourns) | Same VWM (48 V), higher PPPM (600 W), larger SMB package (DO-214AA) | Requires PCB pad redesign; better suited for higher-energy transients where space allows | Select when >400 W pulse handling is required and board real estate permits DO-214AA footprint |
| P4SMAJ48CA (ON Semiconductor) | Identical electrical specs (VWM, VBR, VC, PPPM), same DO-214AC package, but RoHS-compliant with different halogen-free certification path | No layout change needed; suitable for legacy designs requiring second-source qualification | Choose for direct drop-in replacement where ON Semi's supply chain or qualification documentation is preferred |
Compared with SMBJ48CA and P4SMAJ48CA, the SMAJ48CA offers optimal balance of 400 W surge rating, compact DO-214AC footprint, and automotive-grade ISO 7637-2 validation-making it ideal for space-constrained 48 V systems where exact pin-compatible sourcing and thermal profile are critical.
Availability
SMAJ48CA is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial PLC I/O modules, and LED streetlight drivers requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for SMAJ48CA 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 MOSFETs for industrial and automotive markets.
The SMAJ series was developed specifically for high-reliability transient suppression in 12–188 V DC systems, emphasizing fast response, low leakage, and AEC-Q200-aligned robustness without requiring derating for standard ambient conditions.
FAQ
What is the maximum clamping voltage of the SMAJ48CA under a 10/1000 µs transient?
The SMAJ48CA has a maximum clamping voltage (VC) of 77.4 V when subjected to its rated peak impulse current of 5.2 A under the standardized 10/1000 µs waveform. This value is measured per the test condition specified in the Taiwan Semiconductor datasheet Version U2102 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ48CA maintains this clamping performance across its full operating temperature range.
Is the SMAJ48CA unidirectional or bidirectional, and how is polarity indicated?
The SMAJ48CA is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity dependence. Although it features a cathode band marking per DO-214AC convention, this marking does not indicate unidirectional operation-it is retained for mechanical orientation consistency. The SMAJ48CA electrical characteristics apply identically in both directions, as confirmed in the "Devices for Bipolar Applications" section of the Taiwan Semiconductor datasheet.
Does the SMAJ48CA meet automotive transient immunity standards?
Yes, the SMAJ48CA meets ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupling), and Pulse 3b (ground noise). This compliance is explicitly stated in the Features section of the Taiwan Semiconductor datasheet and validated through standardized test waveforms-making the SMAJ48CA suitable for 12 V, 24 V, and 48 V automotive subsystems including body control modules and ADAS power supplies.
What is the reverse leakage current specification for the SMAJ48CA at its working voltage?
The SMAJ48CA exhibits a maximum reverse leakage current (IR) of less than 1 µA when biased at its 48 V working stand-off voltage (VWM). This low leakage is guaranteed at TA = 25 °C and ensures minimal power loss and signal interference in always-on or battery-backed circuits. The specification is verified per the Electrical Characteristics table in the Taiwan Semiconductor datasheet and remains stable across the device's -55 °C to +150 °C operating junction temperature range.
Can the SMAJ48CA be used in place of a unidirectional SMAJ48A in a new design?
No-the SMAJ48CA and SMAJ48A are electrically distinct: SMAJ48CA is bidirectional with symmetrical clamping, while SMAJ48A is unidirectional and only protects against transients of one polarity. Substituting SMAJ48CA for SMAJ48A may cause unintended conduction in DC-biased circuits. Always verify circuit topology and transient directionality; the SMAJ48CA is appropriate only where bidirectional protection is required, such as AC-coupled lines or floating DC rails. Refer to the "Devices for Bipolar Applications" note in the Taiwan Semiconductor datasheet for correct usage guidance.
SMAJ48CA 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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- 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)
SMAJ48CA FAQ
1.How can I place an order for SMAJ48CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CA 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 SMAJ48CA reliable?
The price and inventory of SMAJ48CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48CA is usually 5 days.
3.What payment methods are accepted for SMAJ48CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CA?
SMAJ48CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CA 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 SMAJ48CA?
For technical support, including SMAJ48CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CA requirements.
6.How does Aetrix verify that SMAJ48CA is sourced from the original manufacturer or authorized distributors?
All SMAJ48CA 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 SMAJ48CA meets industry standards.
7.What is the process for return or replacement of SMAJ48CA?
All SMAJ48CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CA, 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 SMAJ48CA part is unused and in its original packaging.
Return procedure for SMAJ48CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48CA 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…
