All Transistor Equivalent Book 【Verified Source】

When using a reference book or database to swap a transistor, follow this systematic approach to ensure your circuit operates safely: Step 1: Identify the Original Part Number

| Limitation | Explanation | | :--- | :--- | | | Old books may list germanium (0.2V Vbe) as equivalent to silicon (0.6V Vbe) – biasing disaster. | | Switching speed | General-purpose books ignore ( t_on/t_off ) for SMPS applications. | | Matched pairs | No book guarantees that two separate transistors will have identical gain (( h_FE )). | | Surface mount (SMD) | Many printed books predate SOT-23. Use digital equivalents for SMD. | | Temperature range | Military spec (-55°C) vs. commercial (0°C) not always noted. |

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Physical shape and pin configuration (e.g., TO-92, TO-220, SOT-23). Famous Transistor Cross-Reference Books

The replacement must be able to handle the same or greater continuous current ( ICcap I sub cap C ) as the original component. 4. DC Current Gain ( hFEh sub cap F cap E end-sub Gain Window: The amplification factor ( hFEh sub cap F cap E end-sub all transistor equivalent book

: Provides summary data for both the original and substitute, including: Polarity : (NPN vs. PNP). Voltage Ratings : Collector-Base ( VCBOcap V sub cap C cap B cap O end-sub ) and Collector-Emitter ( VCEOcap V sub cap C cap E cap O end-sub Current Handling : Maximum collector current ( ICcap I sub cap C Power Dissipation : Measured in Watts ( ) to ensure thermal safety. Gain ( hFEh sub cap F cap E end-sub ) : The amplification factor of the transistor. Frequency ( fTf sub cap T

Transistor equivalent books serve as a bridge between tens of thousands of unique part numbers from global manufacturers.

Platforms like AllTransistors allow you to input a part number and instantly filter substitutes by choosing a percentage tolerance for voltage, current, and gain parameters.

| Original Germanium | Suggested Modern Sub | Modification Required | | :--- | :--- | :--- | | AC128 (PNP) | 2N3906 + 1N5711 on base | Add diode, re-bias collector to 50% Vcc. | | OC71 (PNP) | BC557 (low gain) | Reduce base resistor by 30-50%. | | 2N107 (NPN) | 2N3904 | Increase base resistor to reduce collector current. | When using a reference book or database to

No single table can list every equivalent. The "all transistor equivalent book" is a , not a PDF.

The ECG series is arguably the most famous transistor equivalent system ever created. Originally managed by Sylvania and later acquired by Philips, the ECG system consolidated tens of thousands of worldwide transistor part numbers into a few hundred standardized "ECG numbers" (e.g., ECG123A). If your broken transistor cross-referenced to an ECG159, you could safely use any official ECG159 replacement part. 2. NTE Semiconductors Cross-Reference Guide

The specified transistor might be expensive or hard to find, while a direct equivalent (like a 2N3904) is pennies.

Professional repair technicians and vintage audio enthusiasts. 2. Master Cross Reference Guides (ECA/NTE) | | Surface mount (SMD) | Many printed books predate SOT-23

(Power Dissipation): The replacement must be able to safely dissipate the same amount of heat. hFEh sub cap F cap E end-sub

| Original Transistor | Type / Package | Safe Equivalents (Direct Pin-to-Pin) | Notes | | :--- | :--- | :--- | :--- | | | NPN / TO-92 | PN2222A, 2N3904 (low power only), BC337, KSP2222A | The most common general-purpose NPN. 2N3904 has lower current (200mA vs 600mA). | | 2N2907 / PN2907 | PNP / TO-92 | 2N3906 (low power), BC327, KSP2907A | Complementary to 2N2222. | | 2N3904 | NPN / TO-92 | BC547, BC548, 2SC1815, 2N4401 | Low noise, general purpose. BC547 is European standard equivalent. | | 2N3906 | PNP / TO-92 | BC557, BC558, 2SA1015, 2N4403 | Complementary to 2N3904. | | BC107 / BC108 / BC109 | NPN / TO-18 (metal) | BC547 (plastic TO-92), 2N3904 | Pinout differs! BC107 has C-B-E; BC547 has C-B-E but check your PCB . | | BC557 / BC558 | PNP / TO-92 | 2N3906, 2N4403, BC327 (higher current) | Standard low-power audio PNP. | | BD139 | NPN / TO-126 | BD135, TIP29, 2SC2682 | Medium power. Common in audio drivers. | | BD140 | PNP / TO-126 | BD136, TIP30, 2SA1012 | Complementary to BD139. | | TIP31C | NPN / TO-220 | TIP41C, 2N3055 (different package), MJE3055T | 100V, 3A power transistor. | | TIP32C | PNP / TO-220 | TIP42C, MJE2955T | Complementary to TIP31. | | 2N3055 | NPN / TO-3 (metal) | MJ15003, MJ15024, 2N3773 | Classic 15A power transistor. Use TO-3 substitutes only. | | MJ2955 | PNP / TO-3 | MJ15004, MJ15025 | Complementary to 2N3055. |

Do not exceed the original’s ratings. Check:

Digital scans of classic NTE, ECG, and Jaeger guides are widely circulated in the electronics repair community to service 1970s and 1980s stereo equipment. Why "Universal" Substitutes Aren't Always Perfect