My Inquiry
My Account
Taiwan Semiconductor Corporation SMF54AH
- Part No.:
- SMF54AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF54AH.pdf
- Description:
- TVS DIODE 54VWM 87.1VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:2,226
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF54AH from Taiwan Semiconductor is a unidirectional transient voltage suppressor diode in SOD-123W package, rated for 54 V working stand-off voltage (VWM), 60.0–66.3 V breakdown voltage (VBR), and 200 W peak pulse power (10/1000 µs). It delivers 2.3 A peak impulse current and clamps transients to ≤87.1 V, meeting ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics protection.
For engineers reviewing the SMF54AH datasheet, SMF54AH pinout, SMF54AH application, or SMF54AH equivalent, this device is selected for robust ESD and load-dump surge suppression in 12 V/24 V automotive subsystems where low leakage (<1 µA @ 54 V), AEC-Q101 qualification, and SOD-123W surface-mount compatibility are critical design requirements.
Technical Context
The SMF54AH operates as a unidirectional avalanche diode with photo-glass passivated junction, enabling stable clamping under repetitive transients. Its thermal resistance profile-RθJL = 33 °C/W and RθJA = 100 °C/W on a 5 mm × 5 mm Cu pad-supports reliable operation up to TJ = +175 °C.
It meets ISO 7637-2 immunity requirements across all defined pulses (1, 2a, 2b, 3a, 3b) and exhibits <1 µA reverse leakage at 10 V above VWM, confirming tight voltage margin control and low standby power loss in always-on circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage threshold for 12 V/24 V automotive rails. |
| VBR min/max | 60.0 / 66.3 V - Verified avalanche onset range at 1 mA test current; ensures predictable turn-on without premature conduction. |
| VC @ IPPM | ≤87.1 V - Clamped voltage at 2.3 A peak impulse (10/1000 µs); defines worst-case stress on downstream ICs during load dump. |
| PPPM | 200 W - Peak pulse power handling per JEDEC standard; supports high-energy transients like ISO 7637-2 Pulse 5a (load dump). |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; minimizes quiescent current drain in battery-backed systems. |
| Package | SOD-123W - Surface-mount outline with matte tin-plated leads, J-STD-002 solderable, MSL Level 1, UL 94V-0 molding compound. |
Pinout & Package
SOD-123W package: cathode-indicated surface-mount diode with two terminals (anode and cathode), 0.016 g weight, polarity marked by cathode band. Designed for automated placement and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or low-side return path; enables unidirectional clamping from rail-to-ground. |
| Cathode | Current exit point during forward conduction; high-impedance node in reverse bias | Connected to protected line (e.g., CAN_H, LIN, sensor supply); defines clamping reference to anode potential. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
| Photo-glass passivated junction | Ensures stable VBR and low IR drift over lifetime and temperature; prevents moisture-induced degradation in harsh environments. |
| ISO 7637-2 compliance | Guarantees immunity to standardized automotive transients (Pulse 1/2a/2b/3a/3b), reducing need for additional filtering stages. |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes voltage overshoot during surge events, protecting 5 V–36 V tolerant ICs without derating headroom. |
Applications
| Automotive Power Line Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping rail-to-ground, absorbing up to 200 W surges within 10/1000 µs waveform. Use Value: Prevents latch-up or permanent damage to microcontrollers and power management ICs exposed to >100 V transients. | Use Scenario: Shielding high-speed CAN FD physical layer transceivers from EFT bursts and coupling noise on differential lines. IC Role / Device Role / Timing Role: Rail-to-rail clamping on CAN_H/CAN_L lines using dual SMF54AH devices (cathode-to-line, anode-to-ground). Use Value: Maintains signal integrity below 87.1 V clamping level while preserving <1 µA leakage for low-power sleep modes. |
| Industrial Sensor Interface Protection | LED Driver Input Surge Suppression |
Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors connected to long harnesses in factory automation. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of ADC input or op-amp buffer, responding within nanoseconds to fast transients. Use Value: Enables direct connection to field wiring without external RC filters, reducing BOM count and board space. | Use Scenario: Protecting constant-current LED drivers from inductive kickback when driving solenoid-controlled lighting loads. IC Role / Device Role / Timing Role: Unidirectional clamp across driver input capacitor, diverting energy from MOSFET gate drivers and current-sense resistors. Use Value: Extends driver IC lifetime by limiting voltage stress to ≤87.1 V during 2.3 A transient 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 SMAJ54A | Same SOD-123 package, 54 V VWM, but higher VC = 88.5 V and lower PPPM = 400 W (derated to 200 W at TA > 25°C) | Marginally higher clamping voltage; less suitable for tight 36 V-tolerant IC interfaces | Select SMAJ54A only if higher peak power margin is required at ambient <50°C |
| ON Semiconductor 1.5SMC54A | DO-214AB package (larger footprint), same VWM/VC specs, but 1.5 kW PPPM rating and higher thermal mass | Requires PCB layout change; better for sustained surge duty cycles but over-specified for single-pulse automotive use | Prefer 1.5SMC54A only when system-level thermal dissipation exceeds SOD-123W limits |
Compared with SMAJ54A and 1.5SMC54A, the SMF54AH offers optimal balance of AEC-Q101 qualification, compact SOD-123W footprint, and precise 87.1 V clamping-making it preferred for space-constrained automotive modules where layout stability and qualification traceability are mandatory.
Availability
SMF54AH is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor nodes, and LED lighting drivers requiring stable component supply with full AEC-Q101 traceability and RoHS/halogen-free compliance.
Supply support for SMF54AH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMF54AH belongs to TSC's AEC-Q101-qualified SMF-AH series, engineered specifically for high-reliability transient suppression in automotive power distribution and communication subsystems.
FAQ
What is the maximum clamping voltage of the SMF54AH under standard test conditions?
The SMF54AH has a maximum clamping voltage (VC) of 87.1 V when subjected to its rated peak pulse current (IPPM = 2.3 A) with a 10/1000 µs waveform at TA = 25°C. This value is measured per JEDEC standards and guarantees that downstream components see no more than 87.1 V during surge events, making SMF54AH suitable for protecting 36 V-tolerant ICs in automotive applications.
Is the SMF54AH certified for automotive use?
Yes, the SMF54AH is AEC-Q101 qualified, meaning it has passed rigorous stress tests-including high-temperature reverse bias, temperature cycling, and ESD-required for automotive electronic components. Its qualification covers operation from −55°C to +175°C junction temperature, and it meets ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity standards, confirming suitability for under-hood and chassis-mounted modules.
What package type does the SMF54AH use, and is it compatible with standard SMT processes?
The SMF54AH uses the SOD-123W surface-mount package with matte tin-plated leads compliant with J-STD-002 solderability requirements. Its dimensions, thermal performance (RθJA = 100 °C/W on 5 mm × 5 mm Cu pad), and MSL Level 1 rating make it fully compatible with standard reflow profiles and automated pick-and-place equipment used in high-volume automotive PCB assembly.
How does the SMF54AH compare to the SMF58AH in terms of voltage rating and application scope?
The SMF54AH has a 54 V working stand-off voltage (VWM) and 60.0–66.3 V breakdown range, while the SMF58AH is rated for 58 V VWM and 64.4–71.2 V VBR. This 4 V difference makes SMF54AH appropriate for 12 V/24 V systems with tighter voltage margins, whereas SMF58AH suits higher-voltage auxiliary rails. Both share identical SOD-123W packaging and 200 W PPPM, but SMF54AH's lower VBR improves responsiveness to lower-amplitude transients.
Does the SMF54AH meet environmental compliance standards such as RoHS and halogen-free requirements?
Yes, the SMF54AH is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and the device carries no restricted substances above threshold limits. These certifications are documented in Taiwan Semiconductor's official product change notices and material declarations, supporting compliance for global automotive and industrial end products.
SMF54AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- SOD-123W
- Series:
- SMF
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 2.3A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF54AH FAQ
1.How can I place an order for SMF54AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF54AH 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 SMF54AH reliable?
The price and inventory of SMF54AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF54AH is usually 5 days.
3.What payment methods are accepted for SMF54AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF54AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF54AH?
SMF54AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF54AH 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 SMF54AH?
For technical support, including SMF54AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF54AH requirements.
6.How does Aetrix verify that SMF54AH is sourced from the original manufacturer or authorized distributors?
All SMF54AH 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 SMF54AH meets industry standards.
7.What is the process for return or replacement of SMF54AH?
All SMF54AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF54AH, 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 SMF54AH part is unused and in its original packaging.
Return procedure for SMF54AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF54AH 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
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
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 …
