My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ51C
- Part No.:
- SMBJ51C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51C.pdf
- Description:
- 600W, 63V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:5,400
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ51C from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in power rails and signal lines. It features a 51V working stand-off voltage (VWM), 56.7–69.3V breakdown voltage (VBR @ 1mA), 91.1V maximum clamping voltage (VC @ 6.9A), and <1μA leakage above 10V - ideal for protecting automotive power supplies and industrial I/O interfaces.
For engineers reviewing the SMBJ51C datasheet, SMBJ51C pinout, SMBJ51C application, or SMBJ51C equivalent, key selection criteria include clamping performance under 10/1000µs surges, unidirectional polarity marking, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and thermal derating above 25°C ambient.
Technical Context
The SMBJ51C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (56.7–69.3V). Its glass-passivated junction ensures stable breakdown and low leakage (<1µA at VWM), while fast response time (<1.0ps) enables effective suppression of ESD and electrical fast transients.
Thermal design relies on RθJC = 10°C/W and RθJA = 55°C/W, supporting continuous operation up to TJ = 150°C. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, confirming suitability for automated SMT assembly and harsh-environment deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum DC or continuous reverse operating voltage before conduction begins; defines safe operating margin below breakdown. |
| VBR @ IT=1mA | 56.7–69.3 V - Measured breakdown voltage range at 1mA test current; ensures reliable turn-on during transients without premature clamping. |
| VC @ IPP=6.9A | 91.1 V - Clamped voltage at peak impulse current (10/1000µs waveform); determines maximum stress imposed on protected downstream circuitry. |
| PPK | 600 W - Non-repetitive peak pulse power rating; defines single-event surge energy handling capability per IEC 61000-4-5 / ISO 7637-2. |
| ID @ VWM | <1 µA - Reverse leakage current at rated stand-off voltage; critical for low-power standby circuits and battery-backed systems. |
| TJ max | +150 °C - Maximum junction temperature; sets thermal limits for PCB layout, copper pour, and system-level derating. |
| Package | DO-214AA (SMB) - Standard surface-mount outline with cathode band marking; compatible with JEDEC MS-012AC footprint and automated pick-and-place. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode band indicating terminal polarity. Weight ≈ 0.090g. Moisture sensitivity level (MSL) = 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; forms current sink during transient clamping events. |
| Cathode | Protected line input | Connected to supply rail or signal line requiring protection; reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Clamping voltage ≤91.1V @ 6.9A | Provides predictable overvoltage limiting for 24V/48V industrial buses and automotive 12V/24V systems. |
| Response time <1.0 ps | Enables suppression of sub-nanosecond ESD events (IEC 61000-4-2) before sensitive ICs experience damage. |
| ISO 7637-2 compliant | Validated for automotive load-dump and inductive-switching immunity (Pulse 1, 2a, 2b, 3a, 3b). |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications. |
Applications
| Automotive Power Rail Protection | Industrial I/O Interface Protection |
|---|---|
Use Scenario: Protecting 12V/24V vehicle power distribution networks from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ECUs or body control modules. Use Value: Limits clamped voltage to ≤91.1V during 10/1000µs ISO 7637-2 Pulse 5a events, preventing MOSFET gate oxide failure and MCU brownout. |
Use Scenario: Shielding RS-485/RS-232 transceivers and PLC analog inputs from EFT and surge coupling. IC Role / Device Role / Timing Role: Standoff protection device mounted at connector entry point, shunting transients to chassis ground. Use Value: Sub-1µA leakage preserves signal integrity in high-impedance sensor front-ends; fast response prevents data corruption during 5kHz EFT bursts. |
| LED Driver Supply Protection | DC-DC Converter Input Stage |
Use Scenario: Safeguarding constant-current LED drivers against inductive switching spikes from relay coils or solenoids. IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor to clamp voltage overshoot during coil de-energization. Use Value: 600W peak power rating absorbs 100mJ pulses without degradation, extending driver lifetime in streetlight and signage applications. |
Use Scenario: Preventing overvoltage damage to buck controller ICs during input capacitor charging or upstream switch failures. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VIN pin of DC-DC regulator, positioned before bulk capacitance. Use Value: 51V VWM aligns with 48V nominal input systems, allowing headroom for ripple while triggering before 60V absolute maximum ratings are exceeded. |
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 SMAJ51A | Same DO-214AC (SMA) package; slightly higher VC = 93.6V @ 6.8A; lower PPK = 400W. | Lower power rating limits use in high-energy automotive load-dump scenarios where SMBJ51C's 600W is required. | Select SMAJ51A only if board space allows SMA footprint and system surge energy remains ≤400W. |
| ON Semiconductor 1.5SMC51A | DO-214AB (SMC) package; larger footprint; VC = 93.6V @ 6.8A; PPK = 1500W. | Higher power rating suits heavy-duty industrial equipment but requires PCB redesign due to larger SMC outline. | Choose 1.5SMC51A when surge energy exceeds 600W and mechanical constraints allow larger package; not drop-in compatible. |
Compared with SMAJ51A and 1.5SMC51A, SMBJ51C delivers optimal balance of 600W surge capacity, DO-214AA compactness, and 91.1V clamping - making it preferred for space-constrained 48V automotive and industrial power modules where both size and energy handling are critical.
Availability
SMBJ51C is available at Aetrix Electronics and suitable for automotive electronics, industrial I/O protection, and LED driver designs requiring stable component supply and full traceability through production ramps.
Supply support for SMBJ51C 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs since 1979.
The SMBJ series was developed specifically for high-reliability, high-energy transient suppression in automotive and industrial environments - emphasizing robust clamping, low leakage, and AEC-Q200-aligned process controls.
FAQ
What is the polarity configuration of SMBJ51C?
SMBJ51C is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA package. It conducts only during reverse overvoltage events - forward voltage drop is 3.5V at 50A, per datasheet Note 2. This polarity must be observed during PCB layout to ensure correct clamping behavior on positive-rail protection applications.
Does SMBJ51C meet automotive surge immunity standards?
Yes, SMBJ51C meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (switching-induced transients), and Pulse 3b (ground bounce). Its 600W rating and 91.1V clamping voltage are validated for 12V/24V vehicle electrical systems per this standard.
What is the maximum allowable junction temperature for SMBJ51C?
The maximum junction temperature (TJ) for SMBJ51C is +150°C, as specified in the Absolute Maximum Ratings table. Derating begins above 25°C ambient per Fig.2 in the datasheet, with RθJA = 55°C/W defining thermal resistance to ambient - requiring adequate copper area and airflow for sustained high-power transient events.
How does SMBJ51C differ from SMBJ51A?
SMBJ51C has a minimum breakdown voltage of 56.7V and maximum of 69.3V at 1mA, while SMBJ51A tightens that range to 56.7–62.7V. The 'A' suffix denotes tighter VBR tolerance (±5% vs ±10%), resulting in more consistent clamping onset - but SMBJ51C offers broader manufacturing yield and lower cost for non-critical timing applications.
Is SMBJ51C compatible with lead-free reflow soldering processes?
Yes, SMBJ51C supports lead-free reflow per J-STD-020 MSL Level 1, with peak reflow temperature up to 260°C. Its matte tin-plated leads comply with J-STD-002 for solderability, and the molding compound meets UL 94V-0 flammability - enabling compatibility with standard Pb-free assembly lines without special handling.
SMBJ51C 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 91.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- 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)
SMBJ51C FAQ
1.How can I place an order for SMBJ51C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51C 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 SMBJ51C reliable?
The price and inventory of SMBJ51C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51C is usually 5 days.
3.What payment methods are accepted for SMBJ51C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51C?
SMBJ51C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51C 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 SMBJ51C?
For technical support, including SMBJ51C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51C requirements.
6.How does Aetrix verify that SMBJ51C is sourced from the original manufacturer or authorized distributors?
All SMBJ51C 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 SMBJ51C meets industry standards.
7.What is the process for return or replacement of SMBJ51C?
All SMBJ51C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51C, 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 SMBJ51C part is unused and in its original packaging.
Return procedure for SMBJ51C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51C 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…
