My Inquiry
My Account
Taiwan Semiconductor Corporation 1SMA4748H
- Part No.:
- 1SMA4748H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA4748H.pdf
- Description:
- DIODE ZENER 22V 1.25W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,495
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SMA4748H from Taiwan Semiconductor is a 1 W, 22 V ±5% surface-mount Zener diode in DO-214AC (SMA) package, featuring 23 Ω dynamic impedance at 11.5 mA test current, <1 µA leakage at 16.7 V, and AEC-Q101 qualification for automotive-grade reliability. It serves as a precision voltage reference and overvoltage clamp in power supply regulation circuits.
For engineers reviewing the 1SMA4748H datasheet, 1SMA4748H pinout, 1SMA4748H application, or 1SMA4748H equivalent, key selection criteria include zener voltage tolerance, surge current capability (205 A), thermal derating behavior up to 175°C junction temperature, and compliance with J-STD-020 moisture sensitivity level 1.
Technical Context
The 1SMA4748H operates as a single-die, glass-passivated Zener diode optimized for stable reverse-biased breakdown at 22 V nominal. Its low-inductance SMA package supports high-frequency transient suppression, while the 750 Ω maximum knee impedance (ZZK) ensures predictable turn-on characteristics under low-current bias conditions.
Designed for automated SMT assembly, it maintains ≤1 µA leakage current above 16.7 V and delivers non-repetitive peak surge power of 60 W under 100 µs pulse conditions. The device's -55°C to +175°C operating range and UL 94V-0 molding compound support harsh-environment deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V ±5% - defines precise clamping threshold for 24 V rail protection |
| Test Current (IZT) | 11.5 mA - standard bias point for guaranteed VZ and ZZT specification |
| Zener Impedance (ZZT) | 23 Ω - ensures minimal voltage shift under load variation near regulation point |
| Power Dissipation (PD) | 1 W at 25°C ambient - sets continuous thermal limit on PCB with 5 mm × 5 mm Cu pad |
| Leakage Current (IR) | <1 µA at 16.7 V - guarantees negligible standby current in high-impedance sensing nodes |
| Surge Current (IFSM) | 205 A - supports robust ESD/EMP transient absorption per JEDEC 1/120 s half-sine waveform |
| Junction Temperature (TJ) | -55°C to +175°C - enables operation in under-hood automotive and industrial control environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, cathode indicated by band. Weight: 0.060 g. Matte tin-plated leads, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or lower-potential rail during Zener operation; enables forward-bias testing |
| Cathode | Reverse-bias breakdown terminal / regulated output node | Connected to voltage rail being clamped; carries full surge current during transients |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress-test requirements including temperature cycling and HTRB |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal/humidity stress |
| Low inductance construction | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a) |
| J-STD-020 Level 1 moisture sensitivity | Enables unlimited floor life before reflow; no baking required prior to assembly |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Clamping 24 V supply rail against load-dump transients in BCM microcontroller power domain. IC Role / Device Role / Timing Role: Voltage reference and overvoltage protector for MCU LDO input stage. Use Value: Withstands 205 A surge current and maintains 22 V clamping accuracy within ±5%, preventing brownout or latch-up. | Use Scenario: Protecting 4–20 mA current-loop receiver inputs from field-wiring induced surges. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed across input terminals. Use Value: Sub-µA leakage at 16.7 V preserves loop accuracy; 23 Ω ZZT ensures stable clamping without signal distortion. |
| Telecom Power Supply Reference | Medical Diagnostic Equipment Biasing |
Use Scenario: Providing stable 22 V reference for isolated DC-DC feedback optocoupler biasing. IC Role / Device Role / Timing Role: Precision shunt regulator establishing feedback node voltage. Use Value: ±5% VZ tolerance and 750 Ω knee impedance ensure tight regulation across line/load variations. | Use Scenario: Biasing photodiode amplifier stages requiring low-noise, stable reference voltage. IC Role / Device Role / Timing Role: Low-leakage voltage clamp stabilizing op-amp input common-mode range. Use Value: <1 µA IR at 16.7 V prevents input offset drift; glass passivation ensures parametric stability over 10-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor 1N4748A | Same 22 V ±5%, but DO-41 through-hole package; 1.3 W PD; higher ZZT (25 Ω) | Requires through-hole assembly; unsuitable for high-density SMT layouts | Select when legacy board design mandates axial leaded components or higher continuous power margin |
| Vishay SZ1SMA4748HE3/A | Identical DO-214AC package, AEC-Q101 qualified, same 22 V rating; tighter ZZT spec (22 Ω max) | Drop-in replacement with identical footprint and thermal profile; enhanced surge robustness | Preferred for new automotive designs requiring extended surge margin and traceable sourcing |
Compared with 1SMA4748H, the 1N4748A requires PCB redesign for through-hole mounting and offers no AEC-Q101 validation, while the SZ1SMA4748HE3/A provides identical form-factor compatibility plus marginally improved impedance and documented automotive qualification.
Availability
1SMA4748H is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC analog input protection, and telecom power supply reference circuits requiring stable component supply with AEC-Q101 assurance and SMT scalability.
Supply support for 1SMA4748H 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, rectifiers, and protection components with global distribution and AEC-Q101 certification capability.
The 1SMA47xxH series targets high-reliability surface-mount Zener regulation, emphasizing automotive-grade robustness, low-inductance packaging, and tight parametric control for power rail stabilization and transient suppression.
FAQ
What is the nominal zener voltage and tolerance of the 1SMA4748H?
The 1SMA4748H has a nominal zener voltage of 22 V with a standard tolerance of ±5%, measured at 11.5 mA test current (IZT) with lead temperature maintained at 30°C ±1°C. This tolerance ensures predictable clamping behavior in 24 V system protection applications and is verified per JEDEC registration standards.
Is the 1SMA4748H suitable for automotive applications?
Yes, the 1SMA4748H is AEC-Q101 qualified and designed for automotive use, with operating temperature range from -55°C to +175°C, J-STD-020 Level 1 moisture sensitivity, and glass passivated junction for long-term reliability. These attributes make the 1SMA4748H appropriate for under-hood and body-control module deployments.
What is the maximum non-repetitive surge current rating for the 1SMA4748H?
The 1SMA4748H supports a peak forward surge current (IFSM) of 205 A for an 8.3 ms single half-sine wave, and a non-repetitive peak surge power (PZSM) of 60 W under 100 µs square pulse conditions. These ratings are validated per JEDEC test methods and enable robust transient suppression in industrial and automotive systems.
Does the 1SMA4748H have RoHS and halogen-free compliance?
Yes, the 1SMA4748H is RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 solderability requirements-ensuring environmental and process compatibility for modern electronics manufacturing.
What is the thermal derating behavior of the 1SMA4748H above 25°C ambient?
The 1SMA4748H maintains 1 W power dissipation up to 60°C ambient when mounted on a PCB with thermal resistance RTHJA < 76.8 K/W; above that, derating follows a linear curve to zero at 175°C junction temperature. Full derating data is provided in Figure 1 of the official Taiwan Semiconductor datasheet for the 1SMA4737H–1SMA200ZH family.
1SMA4748H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 16.7 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
1SMA4748H FAQ
1.How can I place an order for 1SMA4748H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA4748H 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 1SMA4748H reliable?
The price and inventory of 1SMA4748H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4748H is usually 5 days.
3.What payment methods are accepted for 1SMA4748H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4748H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA4748H?
1SMA4748H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA4748H 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 1SMA4748H?
For technical support, including 1SMA4748H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4748H requirements.
6.How does Aetrix verify that 1SMA4748H is sourced from the original manufacturer or authorized distributors?
All 1SMA4748H 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 1SMA4748H meets industry standards.
7.What is the process for return or replacement of 1SMA4748H?
All 1SMA4748H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4748H, 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 1SMA4748H part is unused and in its original packaging.
Return procedure for 1SMA4748H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA4748H Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
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…
