My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ48
- Part No.:
- SMBJ48
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48.pdf
- Description:
- 600W, 59.2V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,671
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ48 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 48 V working stand-off voltage (VWM), 53.3–65.1 V breakdown voltage (VBR), 85.5 V maximum clamping voltage (VC) at 7.3 A peak pulse current (IPP), and 600 W peak pulse power (PPK) with <1.0 ps response time.
For engineers reviewing the SMBJ48 datasheet, SMBJ48 pinout, SMBJ48 application, or SMBJ48 equivalent, key selection criteria include clamping performance under IEC 61000-4-2/4-5, unidirectional polarity marking, DO-214AA (SMB) package compatibility with automated SMT placement, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump immunity.
Technical Context
The SMBJ48 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (53.3–65.1 V @ 1 mA). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA @ 48 V), while its fast sub-picosecond response enables effective suppression of ESD transients before downstream ICs are damaged.
Thermally, it supports operation from –55 °C to +150 °C junction temperature, with RθJC = 10 °C/W and RθJA = 55 °C/W. It is rated for 100 A non-repetitive forward surge (IFSM) and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 53.3 / 65.1 V @ 1 mA - Confirmed avalanche onset range defining minimum system overvoltage margin |
| VC @ IPP | 85.5 V @ 7.3 A (10/1000 µs) - Clamped voltage seen by protected circuit during worst-case surge |
| PPK | 600 W - Peak transient power handling capability per single 10/1000 µs pulse |
| ID @ VWM | <1 µA - Low leakage preserves battery life and avoids false triggering in high-impedance circuits |
| Response time | <1.0 ps - Enables suppression of nanosecond-scale ESD events (IEC 61000-4-2) |
| Package | DO-214AA (SMB) - Standardized SMT footprint compatible with IPC-7351B footprint guidelines |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking on one end. Matte tin-plated leads meet J-STD-002 solderability requirements. Polarity is unidirectional: marked end is cathode; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal | Connected to protected line; conducts during overvoltage to shunt energy to ground |
| Anode (unmarked end) | Reference/ground return | Typically tied to system ground or low-impedance return path for clamping loop integrity |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| ISO 7637-2 compliance | Validated for automotive Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant manufacturing |
| MSL Level 1 | Zero floor-life limitation - can be stored indefinitely at ≤30 °C/60% RH without baking prior to reflow |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V/24 V vehicle battery rail exposed to load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤85.5 V, protecting downstream PMICs and microcontrollers from damage during 100 V/100 ms pulses. | Use Scenario: Analog sensor output (e.g., 4–20 mA loop or 0–5 V thermocouple interface) routed across noisy factory floors. IC Role / Device Role / Timing Role: TVS placed at connector entry point, shunting EFT bursts (IEC 61000-4-4) and ESD (IEC 61000-4-2) to chassis ground. Use Value: Sub-1 ps response prevents >1 kV ESD events from propagating into precision op-amps or ADC front-ends. |
| LED Driver Overvoltage Clamp | USB Port ESD Suppression |
Use Scenario: Constant-current LED driver board subjected to inductive kickback from relay-controlled loads. IC Role / Device Role / Timing Role: SMBJ48 placed across driver output terminals to clamp flyback spikes. Use Value: Withstands 600 W peak pulse and clamps to 85.5 V, preventing MOSFET gate oxide rupture and LED string failure. | Use Scenario: USB 2.0 data lines (D+/D−) on embedded host controller exposed to human-body-model (HBM) ESD. IC Role / Device Role / Timing Role: Paired unidirectional SMBJ48 devices (one per line) referenced to local ground plane. Use Value: Low 1 µA leakage avoids signal integrity degradation; 85.5 V clamping protects PHY transceivers without affecting 3.3 V logic thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A | Narrower VBR range (53.3–58.9 V); lower clamping voltage (77.4 V @ 8.1 A) | Better for tighter voltage margin designs where lower VC improves system robustness | Select SMBJ48A if clamping voltage headroom is critical and VBR consistency is prioritized over peak current rating |
| SAC48 | Same VWM (48 V), but higher PPK (1500 W), larger DO-214AB (SMC) package, higher IPP (17.5 A) | Required for higher-energy surges (e.g., ISO 7637-2 Pulse 5a) where 600 W is insufficient | Choose SAC48 only when PCB layout allows larger SMC footprint and system-level testing demands >600 W surge handling |
Compared with SMBJ48A and SAC48, the SMBJ48 offers balanced clamping performance and compact DO-214AA packaging for space-constrained 12–48 V systems, while maintaining full ISO 7637-2 compliance without requiring board redesign.
Availability
SMBJ48 is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial sensor signal conditioning, and LED lighting driver protection requiring stable component supply and full traceability.
Supply support for SMBJ48 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 components.
The SMBJ series was developed specifically for high-reliability, surface-mount transient suppression in automotive, industrial, and consumer electronics-emphasizing low leakage, tight VBR tolerance, and standardized DO-214AA packaging for automated assembly.
FAQ
What is the maximum clamping voltage of SMBJ48 under standard 10/1000 µs surge conditions?
The SMBJ48 has a maximum clamping voltage (VC) of 85.5 V when subjected to a 7.3 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events, ensuring downstream ICs remain within safe operating voltage ranges.
Is SMBJ48 suitable for bidirectional transient protection?
No, SMBJ48 is a unidirectional TVS diode and is not rated for bidirectional operation. For bipolar applications, the SMBJ48C or SMBJ48CA variants must be used. The SMBJ48 device features a cathode band marking and is intended for DC rail protection where polarity is fixed and reverse conduction is not required.
Does SMBJ48 comply with automotive transient immunity standards?
Yes, SMBJ48 meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), making it suitable for 12 V and 24 V automotive subsystems including body control modules, lighting drivers, and sensor interfaces.
What is the moisture sensitivity level (MSL) rating for SMBJ48?
SMBJ48 is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ambient conditions (≤30 °C / 60% RH) and requires no baking prior to reflow soldering. This simplifies manufacturing logistics and eliminates moisture-related popcorning risks during SMT assembly.
How does SMBJ48 compare to SMBJ48A in terms of electrical performance?
SMBJ48A has a tighter breakdown voltage range (53.3–58.9 V vs. 53.3–65.1 V), lower clamping voltage (77.4 V vs. 85.5 V), and slightly higher peak pulse current rating (8.1 A vs. 7.3 A). Both share identical VWM (48 V), PPK (600 W), and DO-214AA packaging, but SMBJ48A provides improved voltage consistency and lower clamping for margin-sensitive designs.
SMBJ48 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 85.5V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SMBJ48 FAQ
1.How can I place an order for SMBJ48 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48 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 SMBJ48 reliable?
The price and inventory of SMBJ48 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48 is usually 5 days.
3.What payment methods are accepted for SMBJ48?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48?
SMBJ48 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48 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 SMBJ48?
For technical support, including SMBJ48 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48 requirements.
6.How does Aetrix verify that SMBJ48 is sourced from the original manufacturer or authorized distributors?
All SMBJ48 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 SMBJ48 meets industry standards.
7.What is the process for return or replacement of SMBJ48?
All SMBJ48 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48, 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 SMBJ48 part is unused and in its original packaging.
Return procedure for SMBJ48:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48 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…
